How to show an indeterminate ProgressBar in Android

MainActivity.java

package com.cfsuman.androidtutorials;

import android.os.Bundle;
import android.app.Activity;
import android.os.Handler;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;


public class MainActivity extends Activity {
    private int progressStatus = 0;
    private Handler handler = new Handler();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Get the widgets reference from XML layout
        Button button = findViewById(R.id.button);
        ProgressBar progressBar = findViewById(R.id.progressBar);
        TextView textView = findViewById(R.id.textView);


        // Set a click listener for Button widget
        button.setOnClickListener(view -> {
            // Disable the button itself
            view.setEnabled(false);

            // Set the progress status zero on each button click
            progressStatus = 0;
            // Visible the progress bar and text view
            progressBar.setVisibility(View.VISIBLE);
            textView.setVisibility(View.VISIBLE);

            // Start the lengthy operation in a background thread
            new Thread(new Runnable() {
                @Override
                public void run() {
                    while (progressStatus < 100) {
                        // Update the progress status
                        progressStatus += 1;

                        // Try to sleep the thread for 20 milliseconds
                        try {
                            Thread.sleep(100);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }

                        // Update the progress bar
                        handler.post(new Runnable() {
                            @Override
                            public void run() {
                                progressBar.setProgress(progressStatus);
                                // Show the progress on TextView
                                textView.setText(progressStatus + "");
                                // If task execution completed
                                if (progressStatus == 100) {
                                    // Hide the progress bar from layout
                                    // after finishing task
                                    progressBar.setVisibility(View.GONE);
                                    // Set a message of completion
                                    textView.setText("Operation completed.");

                                    // Enable the button itself
                                    view.setEnabled(true);
                                }
                            }
                        });
                    }
                }
            }).start(); // Start the operation
        });
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:tools="http://schemas.android.com/tools"
    android:background="#DCDCDC"
    android:padding="24dp">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="64dp"
        android:fontFamily="sans-serif"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="TextView" />

    <ProgressBar
        android:id="@+id/progressBar"
        style="@android:style/Widget.Holo.Light.ProgressBar.Horizontal"
        android:visibility="gone"
        android:indeterminate="true"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_below="@id/textView"
        android:layout_marginTop="16dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:text="Start Task"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/progressBar" />

</androidx.constraintlayout.widget.ConstraintLayout>

How to create a ProgressBar programmatically in Android

Create a ProgressBar In Code

ProgressBar is used to indicate the progress of an operation or long-running task, so the user can get a visual idea of how much time it will take to finish the job. We can simply add a ProgressBar widget to our XML layout file but when android developers want to put a ProgressBar in their app interface is a little bit harder. This android app development tutorial will guide you on how you can add a ProgressBar widget to your app rapidly in java code.




In the first step, we will create a ProgressBar in Java code. After that, we will set its layout parameters and define relative layout rules, and put it to relative layout on a specific location. The relative layout addView method allows us to add a dynamic view to it.




In the second step, we will show the operation progress in our newly added ProgressBar after a button click event. This is a determinate progress bar, so we can simply show the progress percentage in our widget. We also applied a color filter on our programmatically created ProgressBar widget.




The operation run on a background thread, so the app user interface is not blocked by the long-running task. We run an example task using runnable and handler in this tutorial. Button click starts the operation and the handler runs it periodically and completes it on time.

activity_main.xml

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/rl"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp"
    tools:context=".MainActivity"
    android:background="#d6e6de"
    >
    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Create ProgressBar"
        />
    <Button
        android:id="@+id/btn_start"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Start Operation"
        android:layout_toRightOf="@id/btn"
        />
    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/btn_start"
        />
</RelativeLayout>

MainActivity.java

package com.cfsuman.me.androidcodesnippets;

import android.graphics.Color;
import android.graphics.PorterDuff;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.ProgressBar;
import android.os.Handler;
import android.widget.RelativeLayout.LayoutParams;


public class MainActivity extends Activity {
    private int progressStatus = 0;
    private Handler handler = new Handler();
    ProgressBar pb;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Get the widgets reference from XML layout
        final RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);
        final Button btn = (Button) findViewById(R.id.btn);
        final Button btn_start = (Button) findViewById(R.id.btn_start);
        final TextView tv = (TextView) findViewById(R.id.tv);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //ProgressBar(Context context, AttributeSet attrs, int defStyleAttr)
                // Initialize a new Progressbar instance
                // Create a new progress bar programmatically
                pb = new ProgressBar(getApplicationContext(), null, android.R.attr.progressBarStyleHorizontal);

                // Create new layout parameters for progress bar
                LayoutParams lp = new LayoutParams(
                        550, // Width in pixels
                        LayoutParams.WRAP_CONTENT // Height of progress bar
                );

                // Apply the layout parameters for progress bar
                pb.setLayoutParams(lp);

                // Get the progress bar layout parameters
                LayoutParams params = (LayoutParams) pb.getLayoutParams();

                // Set a layout position rule for progress bar
                params.addRule(RelativeLayout.BELOW, tv.getId());

                // Apply the layout rule for progress bar
                pb.setLayoutParams(params);

                // Set the progress bar color
                pb.getProgressDrawable().setColorFilter(Color.BLUE, PorterDuff.Mode.SRC_IN);

                // Finally,  add the progress bar to layout
                rl.addView(pb);
            }
        });

        btn_start.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // Set the progress status zero on each button click
                progressStatus = 0;
                // Start the lengthy operation in a background thread
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        while(progressStatus < 100){
                            // Update the progress status
                            progressStatus +=1;

                            // Try to sleep the thread for 20 milliseconds
                            try{
                                Thread.sleep(20);
                            }catch(InterruptedException e){
                                e.printStackTrace();
                            }

                            // Update the progress bar
                            handler.post(new Runnable() {
                                @Override
                                public void run() {
                                    pb.setProgress(progressStatus);
                                    // Show the progress on TextView
                                    tv.setText(progressStatus+"");
                                }
                            });
                        }
                    }
                }).start(); // Start the operation
           }
        });
    }
}

How to change ProgressBar color programmatically in Android

MainActivity.java

package com.cfsuman.androidtutorials;

import android.graphics.Color;
import android.graphics.PorterDuff;
import android.os.Bundle;
import android.app.Activity;
import android.os.Handler;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;


public class MainActivity extends Activity {
    private int progressStatus = 0;
    private Handler handler = new Handler();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Get the widgets reference from XML layout
        Button button = findViewById(R.id.button);
        ProgressBar pbDefault = findViewById(R.id.pbDefault);
        ProgressBar pbColored = findViewById(R.id.pbColored);
        TextView tvProgress = findViewById(R.id.tvProgress);


        // Change the default color of progress bar programmatically
        pbColored.getProgressDrawable()
                .setColorFilter(Color.RED, PorterDuff.Mode.SRC_IN);


        // Set a click listener for Button widget
        button.setOnClickListener(view -> {
            // Disable the button itself
            view.setEnabled(false);

            // Set the progress status zero on each button click
            progressStatus = 0;

            // Start the lengthy operation in a background thread
            new Thread(new Runnable() {
                @Override
                public void run() {
                    while(progressStatus < 100){
                        // Update the progress status
                        progressStatus +=1;

                        // Try to sleep the thread for 20 milliseconds
                        try{
                            Thread.sleep(100);
                        }catch(InterruptedException e){
                            e.printStackTrace();
                        }

                        // Update the progress bar
                        handler.post(new Runnable() {
                            @Override
                            public void run() {
                                pbDefault.setProgress(progressStatus);
                                pbColored.setProgress(progressStatus);
                                // Show the progress on TextView
                                tvProgress.setText(progressStatus+"");
                            }
                        });
                    }
                }
            }).start(); // Start the operation
        });
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:tools="http://schemas.android.com/tools"
    android:background="#DCDCDC"
    android:padding="24dp">

    <TextView
        android:id="@+id/tvProgress"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="32dp"
        android:layout_marginTop="48dp"
        android:fontFamily="sans-serif"
        android:textSize="24sp"
        android:textStyle="bold"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="TextView" />

    <ProgressBar
        android:id="@+id/pbDefault"
        style="@android:style/Widget.Holo.Light.ProgressBar.Horizontal"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_below="@id/tvProgress"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="8dp"
        app:layout_constraintEnd_toStartOf="@+id/tvDefault"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/tvProgress" />

    <TextView
        android:id="@+id/tvDefault"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:fontFamily="sans-serif"
        android:textSize="16sp"
        android:textStyle="italic"
        app:layout_constraintBottom_toBottomOf="@+id/pbDefault"
        app:layout_constraintEnd_toEndOf="parent"
        android:text="Default Color" />

    <ProgressBar
        android:id="@+id/pbColored"
        style="@android:style/Widget.Holo.Light.ProgressBar.Horizontal"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_below="@id/tvProgress"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="8dp"
        app:layout_constraintEnd_toStartOf="@+id/tvColored"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/pbDefault" />

    <TextView
        android:id="@+id/tvColored"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:fontFamily="sans-serif"
        android:textSize="16sp"
        android:textStyle="italic"
        app:layout_constraintBottom_toBottomOf="@+id/pbColored"
        app:layout_constraintEnd_toEndOf="parent"
        android:text="Custom Color" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:text="Start"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/pbColored" />

</androidx.constraintlayout.widget.ConstraintLayout>

Android horizontal ProgressBar example

MainActivity.java

package com.cfsuman.androidtutorials;

import android.os.Bundle;
import android.app.Activity;
import android.os.Handler;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;


public class MainActivity extends Activity {
    private int progressStatus = 0;
    private Handler handler = new Handler();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Get the widgets reference from XML layout
        Button button = findViewById(R.id.button);
        ProgressBar progressBar = findViewById(R.id.progressBar);
        TextView textView = findViewById(R.id.textView);


        // Set a click listener for Button widget
        button.setOnClickListener(view -> {
            // Disable the button itself
            view.setEnabled(false);

            // Set the progress status zero on each button click
            progressStatus = 0;

            // Start the lengthy operation in a background thread
            new Thread(new Runnable() {
                @Override
                public void run() {
                    while(progressStatus < 100){
                        // Update the progress status
                        progressStatus +=1;

                        // Try to sleep the thread for 20 milliseconds
                        try{
                            Thread.sleep(100);
                        }catch(InterruptedException e){
                            e.printStackTrace();
                        }

                        // Update the progress bar
                        handler.post(new Runnable() {
                            @Override
                            public void run() {
                                progressBar.setProgress(progressStatus);
                                // Show the progress on TextView
                                textView.setText(progressStatus+"");
                            }
                        });
                    }
                }
            }).start(); // Start the operation
        });
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:tools="http://schemas.android.com/tools"
    android:background="#DCDCDC"
    android:padding="24dp">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="64dp"
        android:fontFamily="sans-serif"
        android:textSize="24sp"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="TextView" />

    <ProgressBar
        android:id="@+id/progressBar"
        style="@android:style/Widget.Holo.Light.ProgressBar.Horizontal"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_below="@id/textView"
        android:layout_marginTop="16dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:text="Start"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/progressBar" />

</androidx.constraintlayout.widget.ConstraintLayout>

How to set ImageView width and height programmatically in Android

Set ImageView Width & Height Programmatically

ImageView widget allows us to display an image object to the android app user interface. We can add an ImageView element to the app interface by putting an ImageView tag inside the XML layout file. Then we can define the image source of the ImageView widget. We also can set the ImageView width and height in the XML layout file using ImageView layout width and height attributes. This is an easy task.




But sometimes android app developers need to change the Imageview size (height and width) using their java or kotlin scripting file. This is called programmatically changing ImageView height and width in an android application. This android app development tutorial demonstrates to you how can we change the ImageView width and height dynamically in an android application.




To do that, at first we will put an ImageView widget to our XML layout file. We will wrap our ImageView widget with a constraint layout. We will also add a Button widget to the XML layout file. This Button widget’s click event will dynamically change the ImageView width and height.




Inside the Button click event, we will define the ImageView new width and height. Then we call ImageView requestLayout() method to invalidate the layout. Then, we will call ImageView getLayoutParams() method and apply the new width and height of it. Finally, we will specify the ImageView image scale type, so that the image will display perfectly inside the ImageView widget.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="24dp"
    tools:context=".MainActivity"
    android:background="#F8F8FF">

    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Set ImageView New Width, Height"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/iv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:src="@drawable/flower"
        android:background="#DCDCDC"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btn" />

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

package com.cfsuman.androidtutorials;

import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;
import android.widget.ImageView;


public class MainActivity extends Activity {
        private ImageView mImageView;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_main);

                // Get the widgets reference from XML layout
                mImageView = (ImageView) findViewById(R.id.iv);
                Button mBTN = (Button) findViewById(R.id.btn);


                // Set a click listener for Button widget
                mBTN.setOnClickListener(view -> {
                        int newHeight = 200; // New height in pixels
                        int newWidth = 300; // New width in pixels

                        /*
                            requestLayout()
                                Call this when something has changed which has
                                invalidated the layout of this view.
                        */
                        mImageView.requestLayout();

                        /*
                            getLayoutParams()
                                Get the LayoutParams associated with this view.
                        */

                        // Apply the new height for ImageView programmatically
                        mImageView.getLayoutParams().height = newHeight;

                        // Apply the new width for ImageView programmatically
                        mImageView.getLayoutParams().width = newWidth;

                        // Set the scale type for ImageView image scaling
                        mImageView.setScaleType(ImageView.ScaleType.FIT_XY);
                });
        }
}

How to create an ImageView programmatically in Android

Create An ImageView Programmatically

The ImageView element displays an image to its visible area. Android app developers can simply add an ImageView tag and available attributes to their XML layout file to show an ImageView to the android app user interface. In this XML layout file, they can set the ImageView image source by using its src attribute. This is a simple job.




But sometimes, android app developers want to add an ImageView widget programmatically to their android application. So they have to write a few lines of code to their java or kotlin programming file to achieve this. This android app development tutorial will demonstrate to us how can we add an ImageView widget to our android application dynamically and set an image source to display it.




Though the following code snippets are very clear to understand the full scenario, we will describe here the code. To add an ImageView programmatically to the layout we first add a relative layout in the XML layout file. Then we will put a Button widget inside it. On the Button click event, we will add the ImageView inside the relative layout programmatically.




Inside the Button click event, we will call ImageView() method to create an instance of a new ImageView widget. Then we will call Imageview setImageDrawable() method to add a drawable image source to the ImageView widget.




After that, we will create a LayoutParams object to define the newly created ImageView layout parameters such as width and height. In this layout parameters object, we will add a rule to put ImageView widget below of Button widget inside the relative layout. Then we will apply this layout parameters object to the ImageView widget.




Finally, we add the newly created ImageView object to the relative layout using the addView() method. Now our android app will create an ImageView programmatically on the Button click event and display an image on it.

activity_main.xml

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/rl"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp"
    tools:context=".MainActivity"
    android:background="#bfbbb1"
    >
    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Create ImageView"
        />
</RelativeLayout>

MainActivity.java

package com.cfsuman.androidtutorials;

import android.os.Bundle;
import android.app.Activity;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.RelativeLayout.LayoutParams;
import androidx.core.content.ContextCompat;


public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Get the context
        MainActivity context = this;

        // Get the widgets reference from XML layout
        final RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);
        final Button btn = (Button) findViewById(R.id.btn);

        btn.setOnClickListener(view -> {
            // Initialize a new ImageView widget
            ImageView iv = new ImageView(getApplicationContext());

            // Set an image for ImageView
            iv.setImageDrawable(
                    ContextCompat.getDrawable(
                            context,
                            R.drawable.flower_small
                    )
            );

            // Create layout parameters for ImageView
            LayoutParams lp = new LayoutParams(
                    LayoutParams.WRAP_CONTENT,
                    LayoutParams.WRAP_CONTENT
            );

            // Add rule to layout parameters
            // Add the ImageView below to Button
            lp.addRule(RelativeLayout.BELOW, btn.getId());

            // Add layout parameters to ImageView
            iv.setLayoutParams(lp);

            // Finally, add the ImageView to layout
            rl.addView(iv);
        });
    }
}

How to set a bitmap to ImageView in Android

activity_main.xml

<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#DCDCDC"
    android:padding="24dp"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Set Bitmap To ImageView"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/iv"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="16dp"
        android:scaleType="centerCrop"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button" />

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

package com.cfsuman.androidtutorials;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.app.Activity;
import android.widget.Button;
import android.widget.ImageView;


public class MainActivity extends Activity {
        private ImageView mImageView;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_main);

                // Get the widgets reference from XML layout
                Button btn = findViewById(R.id.button);
                mImageView = findViewById(R.id.iv);

                btn.setOnClickListener(v -> {
                        Bitmap bitmap = BitmapFactory.decodeResource(
                                getResources(),R.drawable.flower6
                        );

                        // Set ImageView image as a Bitmap
                        mImageView.setImageBitmap(bitmap);
                });
        }
}

How to set ImageView image from Assets in Android

activity_main.xml

<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#DCDCDC"
    android:padding="24dp"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Set ImageView Image From Assets"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/iv"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="16dp"
        android:scaleType="centerCrop"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button" />

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

package com.cfsuman.androidtutorials;

import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.app.Activity;
import android.widget.Button;
import android.widget.ImageView;
import java.io.IOException;
import java.io.InputStream;


public class MainActivity extends Activity {
        private ImageView mImageView;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_main);

                // Get the widgets reference from XML layout
                Button btn = findViewById(R.id.button);
                mImageView = findViewById(R.id.iv);

                // String variable to hold specified image file name
                final String imageFileName = "flower101.jpg";

                btn.setOnClickListener(v -> {
                        // Set ImageView image from drawable resource
                        mImageView.setImageBitmap(
                                getBitmapFromAssets(imageFileName)
                        );
                });
        }


        // Custom method to get assets folder image as bitmap
        private Bitmap getBitmapFromAssets(String fileName){
                AssetManager am = getAssets();
                InputStream is = null;
                try{
                        is = am.open(fileName);
                }catch(IOException e){
                        e.printStackTrace();
                }

                return BitmapFactory.decodeStream(is);
        }
}

How to set ImageView image from drawable in Android

activity_main.xml

<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#DCDCDC"
    android:padding="24dp"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Set ImageView Image"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/iv"
        android:layout_width="match_parent"
        android:layout_height="250dp"
        android:layout_marginTop="16dp"
        android:scaleType="centerCrop"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button" />

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

package com.cfsuman.androidtutorials;

import android.os.Bundle;
import android.app.Activity;
import android.widget.Button;
import android.widget.ImageView;
import androidx.core.content.ContextCompat;


public class MainActivity extends Activity {
        private ImageView mImageView;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_main);

                // Get the context
                MainActivity context = this;

                // Get the widgets reference from XML layout
                Button btn = findViewById(R.id.button);
                mImageView = findViewById(R.id.iv);

                btn.setOnClickListener(v -> {
                        // Set ImageView image from drawable resource
                        mImageView.setImageDrawable(
                                ContextCompat.getDrawable(
                                        context,
                                        R.drawable.flower7
                                )
                        );
                });
        }
}

How to set ImageView image from URL in Android

activity_main.xml

<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#DCDCDC"
    android:padding="24dp"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="DownLoad And Set Image"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/iv"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="16dp"
        android:scaleType="centerCrop"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button" />

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

package com.cfsuman.androidtutorials;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.widget.Button;
import android.widget.ImageView;
import java.io.InputStream;
import java.net.URL;


public class MainActivity extends Activity {
        private ImageView mImageView;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_main);

                // Get the widgets reference from XML layout
                Button btn = findViewById(R.id.button);
                mImageView = findViewById(R.id.iv);

                final String imgURL  = "https://images.pexels.com/photos/" +
                        "1337332/pexels-photo-1337332.jpeg";

                btn.setOnClickListener(v -> {
                        new DownLoadImageTask(mImageView).execute(imgURL);
                });
        }


        private class DownLoadImageTask extends AsyncTask<String,Void,Bitmap> {
                ImageView imageView;

                public DownLoadImageTask(ImageView imageView){
                        this.imageView = imageView;
                }

                protected Bitmap doInBackground(String...urls){
                        String urlOfImage = urls[0];
                        Bitmap logo = null;
                        try{
                                InputStream is = new URL(urlOfImage)
                                        .openStream();
                                logo = BitmapFactory.decodeStream(is);
                        }catch(Exception e){ // Catch the download exception
                                e.printStackTrace();
                        }
                        return logo;
                }

                protected void onPostExecute(Bitmap result){
                        imageView.setImageBitmap(result);
                }
        }
}

How to programmatically set image to ImageView in Android

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="24dp"
    tools:context=".MainActivity"
    android:background="#DCDCDC">

    <ImageView
        android:id="@+id/iv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

package com.cfsuman.androidtutorials;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ImageView;


public class MainActivity extends Activity {
        private ImageView mImageView;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_main);

                // Get the widgets reference from XML layout
                mImageView = (ImageView) findViewById(R.id.iv);

                /*
                    public void setImageResource (int resId)
                        Sets a drawable as the content of this ImageView.

                        Related XML Attributes
                            android:src

                        Parameters
                            resId : the resource identifier of the drawable
                 */

                // Set the ImageView image programmatically
                mImageView.setImageResource(R.drawable.flower5);
        }
}

How to set an image to ImageView in XML in Android

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="24dp"
    tools:context=".MainActivity"
    android:background="#F0F8FF">

    <!--
        ImageView
            Displays an arbitrary image, such as an icon.
            The ImageView class can load images from various sources.
    -->

    <!--
        android:src
            Sets a drawable as the content of this ImageView.

            May be a reference to another resource,
            in the form "@[+][package:]type:name"
            or to a theme attribute in the form "?[package:][type:]name".

            May be a color value, in the form of "#rgb", "#argb",
            "#rrggbb", or "#aarrggbb".

            This corresponds to the global attribute resource symbol src.
    -->

    <!-- Set ImageView image in XML layout -->
    <ImageView
        android:id="@+id/iv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:src="@drawable/flower6"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

How to set an image to ImageView in Android

activity_main.xml

<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#d8dcda"
    android:padding="24dp"
    tools:context=".MainActivity">

    <!-- Set ImageView image by XML-->
    <ImageView
        android:id="@+id/ivXML"
        android:layout_width="match_parent"
        android:layout_height="150dp"
        android:src="@drawable/flower"
        android:scaleType="centerCrop"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <!-- Set ImageView image programmatically-->
    <ImageView
        android:id="@+id/ivResource"
        android:layout_width="match_parent"
        android:layout_height="150dp"
        android:layout_marginTop="8dp"
        android:scaleType="centerCrop"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/ivXML" />

    <!-- Set ImageView image as drawable programmatically-->
    <ImageView
        android:id="@+id/ivDrawable"
        android:layout_width="match_parent"
        android:layout_height="150dp"
        android:layout_marginTop="8dp"
        android:scaleType="centerCrop"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/ivResource" />

    <!-- Set ImageView image as bitmap programmatically-->
    <ImageView
        android:id="@+id/ivBitmap"
        android:layout_width="match_parent"
        android:layout_height="150dp"
        android:layout_marginTop="8dp"
        android:scaleType="centerCrop"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/ivDrawable" />

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

package com.cfsuman.androidtutorials;

import android.os.Bundle;
import android.app.Activity;
import android.widget.ImageView;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import androidx.core.content.ContextCompat;


public class MainActivity extends Activity {

        @Override
        protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_main);

                // Get the context
                MainActivity context = this;

                // Get the widgets reference from XML layout
                ImageView ivResource = findViewById(R.id.ivResource);
                ImageView ivDrawable = findViewById(R.id.ivDrawable);
                ImageView ivBitmap = findViewById(R.id.ivBitmap);

                // Set image from resource
                ivResource.setImageResource(R.drawable.flower2);

                // Set image as drawable for third ImageView
                ivDrawable.setImageDrawable(
                        ContextCompat.getDrawable(
                                context,
                                R.drawable.flower3
                        )
                );

                Bitmap bitmap = BitmapFactory.decodeResource(
                        getResources(),R.drawable.flower4);

                // Set image as bitmap for fourth ImageView
                ivBitmap.setImageBitmap(bitmap);
        }
}

How to set DatePickerDialog cancel button click listener in Android

MainActivity.java

package com.cfsuman.androidtutorials;

import android.app.DatePickerDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.DialogFragment;
import java.util.Calendar;


public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Get the widgets reference from XML layout
        Button button = findViewById(R.id.button);


        // Show the date picker dialog
        button.setOnClickListener(v -> {
            // Initialize a new date picker dialog fragment
            DialogFragment dialogFragment = new DatePickerFragment();

            // Show the date picker dialog fragment
            dialogFragment.show(
                    getSupportFragmentManager(),
                    "Date Picker"
            );
        });
    }



    public static class DatePickerFragment extends DialogFragment
            implements DatePickerDialog.OnDateSetListener{

        @NonNull
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState){
            final Calendar calendar = Calendar.getInstance();
            int year = calendar.get(Calendar.YEAR);
            int month = calendar.get(Calendar.MONTH);
            int day = calendar.get(Calendar.DAY_OF_MONTH);

            // Return the DatePickerDialog
            return new DatePickerDialog(
                    getActivity(),0, this,year,month,day);
        }


        public void onDateSet(
                DatePicker view, int year, int month, int day){
            // Do something with the chosen date
        }


        public void onCancel(@NonNull DialogInterface dialog){
            // Send a message to confirm cancel button click
            Toast.makeText(
                    getActivity(),
                    "Date Picker Dialog Canceled.",
                    Toast.LENGTH_SHORT
            ).show();
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#DCDCDC"
    android:padding="24dp">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Show DatePickerDialog"
        android:textAllCaps="false"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

How to create a custom Title for DatePickerDialog in Android

MainActivity.java

package com.cfsuman.androidtutorials;

import android.app.DatePickerDialog;
import android.app.Dialog;
import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Bundle;
import android.util.TypedValue;
import android.view.Gravity;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.constraintlayout.widget.ConstraintLayout.LayoutParams;
import androidx.fragment.app.DialogFragment;
import java.util.Calendar;


public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Get the widgets reference from XML layout
        Button button = findViewById(R.id.button);


        // Show the date picker dialog
        button.setOnClickListener(v -> {
            // Initialize a new date picker dialog fragment
            DialogFragment dFragment = new DatePickerFragment();

            // Show the date picker dialog fragment
            dFragment.show(
                    getSupportFragmentManager(),
                    "Date Picker"
            );
        });
    }



    public static class DatePickerFragment extends DialogFragment
            implements DatePickerDialog.OnDateSetListener{

        @NonNull
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState){
            final Calendar calendar = Calendar.getInstance();
            int year = calendar.get(Calendar.YEAR);
            int month = calendar.get(Calendar.MONTH);
            int day = calendar.get(Calendar.DAY_OF_MONTH);


            DatePickerDialog datePickerDialog = new DatePickerDialog(
                    getActivity(),0,this,year,month,day);


            // Create a TextView programmatically.
            TextView textView = new TextView(getActivity());


            // Create a TextView programmatically
            LayoutParams lp = new LayoutParams(
                    LayoutParams.WRAP_CONTENT, // Width of TextView
                    LayoutParams.WRAP_CONTENT  // Height of TextView
            );
            textView.setLayoutParams(lp);
            textView.setPadding(0, 48, 0, 48);
            textView.setGravity(Gravity.CENTER);
            textView.setTypeface(Typeface.SANS_SERIF,Typeface.ITALIC);
            textView.setTextSize(TypedValue.COMPLEX_UNIT_SP,24);
            textView.setText("This is a custom title.");
            textView.setTextColor(Color.WHITE);
            textView.setBackgroundColor(Color.parseColor("#5DA493"));


            // Set the newly created TextView as
            // a custom tile of DatePickerDialog
            datePickerDialog.setCustomTitle(textView);


            // Or you can simply set a tile for DatePickerDialog
            // Uncomment this line to activate it
            //datePickerDialog.setTitle("This is a simple title.");


            // Return the DatePickerDialog
            return  datePickerDialog;
        }

        public void onDateSet(
                DatePicker view, int year, int month, int day){
            // Do something with the chosen date
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#DCDCDC"
    android:padding="24dp">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Show DatePickerDialog"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

How to set DatePickerDialog max date and min date in Android

MainActivity.java

package com.cfsuman.androidtutorials;

import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.DialogFragment;
import java.text.DateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;


public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Get the widgets reference from XML layout
        Button button = findViewById(R.id.button);


        // Show the date picker dialog
        button.setOnClickListener(v -> {
            // Initialize a new date picker dialog fragment
            DialogFragment dialogFragment = new DatePickerFragment();

            // Show the date picker dialog fragment
            dialogFragment.show(
                    getSupportFragmentManager(),
                    "Date Picker"
            );
        });
    }



    public static class DatePickerFragment extends DialogFragment
            implements DatePickerDialog.OnDateSetListener{

        @NonNull
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState){
            final Calendar calendar = Calendar.getInstance();
            int year = calendar.get(Calendar.YEAR);
            int month = calendar.get(Calendar.MONTH);
            int day = calendar.get(Calendar.DAY_OF_MONTH);

            DatePickerDialog datePickerDialog = new DatePickerDialog(
                    getActivity(),
                    //AlertDialog.THEME_HOLO_LIGHT,
                    0,
                    this,year,month,day);

            // Add 3 days to Calendar
            calendar.add(Calendar.DATE, 3);


            // Set the Calendar new date as
            // maximum date of date picker
            datePickerDialog.getDatePicker().setMaxDate(
                    calendar.getTimeInMillis());

            // Subtract 6 days from Calendar updated date
            calendar.add(Calendar.DATE, -6);

            // Set the Calendar new date as
            // minimum date of date picker
            datePickerDialog.getDatePicker().setMinDate(
                    calendar.getTimeInMillis());

            // So, now date picker selectable date
            // range is 7 days only
            // Return the DatePickerDialog
            return  datePickerDialog;
        }


        public void onDateSet(
                DatePicker view, int year, int month, int day){

            // Get the text view from XML layout
            TextView textView = (TextView) requireActivity()
                    .findViewById(R.id.textView);

            // Create a Date variable/object with user chosen date
            Calendar cal = Calendar.getInstance();
            cal.setTimeInMillis(0);
            cal.set(year, month, day, 0, 0, 0);
            Date chosenDate = cal.getTime();

            // Format the date using style and locale
            DateFormat df = DateFormat.getDateInstance(
                    DateFormat.MEDIUM, Locale.US);
            String formattedDate = df.format(chosenDate);

            // Display the chosen date to app interface
            textView.setText(formattedDate);
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:tool="http://schemas.android.com/tools"
    android:background="#DCDCDC"
    android:padding="24dp">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Set Date"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:fontFamily="sans-serif"
        android:textSize="24sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button"
        tool:text="TextView" />

</androidx.constraintlayout.widget.ConstraintLayout>

How to use theme in DatePickerDialog in Android

MainActivity.java

package com.cfsuman.androidtutorials;

import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.widget.Button;
import android.widget.DatePicker;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.view.ContextThemeWrapper;
import androidx.fragment.app.DialogFragment;
import java.util.Calendar;


public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Get the widgets reference from XML layout
        Button button = findViewById(R.id.button);


        // Show the date picker dialog
        button.setOnClickListener(v -> {
            // Initialize a new date picker dialog fragment
            DialogFragment dialogFragment = new DatePickerFragment();

            // Show the date picker dialog fragment
            dialogFragment.show(
                    getSupportFragmentManager(),
                    "Date Picker"
            );
        });
    }



    public static class DatePickerFragment extends DialogFragment
            implements DatePickerDialog.OnDateSetListener{

        @NonNull
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState){
            final Calendar calendar = Calendar.getInstance();
            int year = calendar.get(Calendar.YEAR);
            int month = calendar.get(Calendar.MONTH);
            int day = calendar.get(Calendar.DAY_OF_MONTH);


            // Create a ContextThemeWrapper instance
            ContextThemeWrapper contextThemeWrapper
                    = new ContextThemeWrapper(
                    getActivity(),
                    android.R.style.Theme_Holo_Light_Dialog
                    //android.R.style.Theme_Holo_Dialog
            );


            // Return the DatePickerDialog
            return new DatePickerDialog(
                    getActivity(),
                    contextThemeWrapper.getThemeResId(),
                    this,year,month,day
            );
        }


        public void onDateSet(
                DatePicker view, int year, int month, int day){
            // Do something with the chosen date
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#DCDCDC"
    android:padding="24dp">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Show DatePickerDialog"
        android:textAllCaps="false"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

How to format DatePickerDialog selected date in Android

MainActivity.java

package com.cfsuman.androidtutorials;

import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.DialogFragment;
import java.text.DateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;


public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Get the widgets reference from XML layout
        Button button = findViewById(R.id.button);


        // Show the date picker dialog
        button.setOnClickListener(v -> {
            // Initialize a new date picker dialog fragment
            DialogFragment dFragment = new DatePickerFragment();

            // Show the date picker dialog fragment
            dFragment.show(
                    getSupportFragmentManager(),
                    "Date Picker"
            );
        });
    }



    public static class DatePickerFragment extends DialogFragment
            implements DatePickerDialog.OnDateSetListener{

        @NonNull
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState){
            final Calendar calendar = Calendar.getInstance();
            int year = calendar.get(Calendar.YEAR);
            int month = calendar.get(Calendar.MONTH);
            int day = calendar.get(Calendar.DAY_OF_MONTH);

            return new DatePickerDialog(
                    getActivity(),0, this,year,month,day);
        }


        public void onDateSet(
                DatePicker view, int year, int month, int day){

            // Get the text view from XML layout
            TextView textView = (TextView) requireActivity()
                    .findViewById(R.id.textView);


            // Show the chosen date
            // Because month index start from zero
            int actualMonth = month+1;
            // Display the unformatted date to TextView
            textView.setText(
                    "Year : " + year + ", Month : " + actualMonth
                            + ", Day : " + day + "\n\n");


            // Create a Date variable/object with user chosen date
            Calendar cal = Calendar.getInstance();
            cal.setTimeInMillis(0);
            cal.set(year, month, day, 0, 0, 0);
            Date chosenDate = cal.getTime();


            // Format the date using style medium and US locale
            DateFormat df_medium_us = DateFormat.getDateInstance(
                    DateFormat.MEDIUM, Locale.US);
            String df_medium_us_str = df_medium_us.format(chosenDate);
            // Display the formatted date
            textView.append(df_medium_us_str
                    + "\nDateFormat MEDIUM, Locale US\n\n");


            // Format the date using style medium and UK locale
            DateFormat df_medium_uk = DateFormat.getDateInstance(
                    DateFormat.MEDIUM, Locale.UK);
            String df_medium_uk_str = df_medium_uk.format(chosenDate);
            // Display the formatted date
            textView.append(df_medium_uk_str
                    + "\nDateFormat MEDIUM, Locale UK\n\n");


            // Format the date using style short
            DateFormat df_short = DateFormat
                    .getDateInstance(DateFormat.SHORT);
            String df_short_str = df_short.format(chosenDate);
            // Display the formatted date
            textView.append(df_short_str + " \nDateFormat SHORT\n\n");


            // Format the date using style long
            DateFormat df_long = DateFormat
                    .getDateInstance(DateFormat.LONG);
            String df_long_str = df_long.format(chosenDate);
            // Display the formatted date
            textView.append(df_long_str + " \nDateFormat LONG\n\n");



            // Format the date using style full
            DateFormat df_full = DateFormat
                    .getDateInstance(DateFormat.FULL);
            String df_full_str = df_full.format(chosenDate);
            // Display the formatted date
            textView.append(df_full_str + " \nDateFormat FULL");
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:tool="http://schemas.android.com/tools"
    android:background="#DCDCDC"
    android:padding="24dp">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Set Date"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:fontFamily="sans-serif"
        android:textSize="24sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button"
        tool:text="TextView" />

</androidx.constraintlayout.widget.ConstraintLayout>

How to get AM PM value from TimePickerDialog in Android

MainActivity.java

package com.cfsuman.androidtutorials;

import android.os.Bundle;
import android.widget.Button;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.DialogFragment;


public class MainActivity extends AppCompatActivity {

        @Override
        protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.activity_main);

                // Get the widgets reference from XML layout
                Button button = (Button) findViewById(R.id.button);

                button.setOnClickListener(v -> {
                        // Initialize a new time picker dialog fragment
                        DialogFragment dialogFragment 
                                = new TimePickerFragment();

                        // Show the time picker dialog fragment
                        dialogFragment.show(
                                getSupportFragmentManager(),
                                "Time Picker"
                        );
                });
        }
}

TimePickerFragment.java

package com.cfsuman.androidtutorials;

import android.app.Dialog;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.TimePicker;
import androidx.annotation.NonNull;
import androidx.fragment.app.DialogFragment;
import java.util.Calendar;


public class TimePickerFragment extends DialogFragment
        implements TimePickerDialog.OnTimeSetListener{

    @NonNull
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState){
        // Get a Calendar instance
        Calendar calendar = Calendar.getInstance();
        // Get the current hour and minute
        int hour = calendar.get(Calendar.HOUR_OF_DAY);
        int minute = calendar.get(Calendar.MINUTE);

        // Return the TimePickerDialog
        return new TimePickerDialog(
                getActivity(),0,
                this,hour,minute,false);
    }



    public void onTimeSet(TimePicker view,
                          int hourOfDay, int minute){
        // Variable to hold the current time AM PM Status
        // Initially we set the variable value to AM
        String status = "AM";

        if(hourOfDay > 11){
            // If the hour is greater than or equal to 12
            // Then the current AM PM status is PM
            status = "PM";
        }

        // Initialize a new variable to
        // hold 12 hour format hour value
        int hour_of_12_hour_format;


        if(hourOfDay > 11){
            // If the hour is greater than or equal to 12
            // Then we subtract 12 from the hour
            // to make it 12 hour format time
            hour_of_12_hour_format = hourOfDay - 12;
        }
        else { hour_of_12_hour_format = hourOfDay; }


        // Get the calling activity TextView reference
        TextView tv = (TextView) requireActivity()
                .findViewById(R.id.textView);


        // Display the 12 hour format time in app interface
        tv.setText(hour_of_12_hour_format
                + " : " + minute + " : " + status);
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:tool="http://schemas.android.com/tools"
    android:background="#DCDCDC"
    android:padding="24dp">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Set Time"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:fontFamily="sans-serif"
        android:textSize="24sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button"
        tool:text="TextView" />

</androidx.constraintlayout.widget.ConstraintLayout>