Skip to main content

android kotlin - Snackbar example






MainActivity.kt



package com.cfsuman.kotlintutorials

import android.graphics.Color
import android.graphics.Typeface
import android.os.Bundle
import android.widget.Button
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import androidx.constraintlayout.widget.ConstraintLayout
import com.google.android.material.snackbar.Snackbar


class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // Get the widgets reference from XML layout
        val rootLayout = findViewById<ConstraintLayout>(R.id.rootLayout)
        val buttonSimple = findViewById<Button>(R.id.buttonSimple)
        val buttonAction = findViewById<Button>(R.id.buttonAction)
        val buttonStyle = findViewById<Button>(R.id.buttonStyle)


        // Button click listener
        buttonSimple.setOnClickListener{
            Snackbar.make(
                rootLayout, // Parent view
                "Hello Snackbar!", // Message to show
                Snackbar.LENGTH_SHORT // How long to display the message.
            ).show()
        }


        // Button to show a snack bar with action enabled
        buttonAction.setOnClickListener{
            // Change the app background color
            rootLayout.setBackgroundColor(
                Color.parseColor("#A8C3BC")
            )

            // Show a snack bar for undo option
            Snackbar.make(
                rootLayout, // Parent view
                "We changes app background color.", // Message to show
                Snackbar.LENGTH_LONG //
            ).setAction( // Set an action for snack bar
                "Undo" // Action button text
            ){ // Action button click listener
                // Do something when undo action button clicked
                rootLayout.setBackgroundColor(
                    Color.parseColor("#F8F8F8")
                )
            }.show() // Finally show the snack bar
        }


        // Customize the snack bar style
        buttonStyle.setOnClickListener{
            // Initialize a new snack bar instance
            val snackbar = Snackbar.make(
                rootLayout,
                "This is a styled snack bar.",
                Snackbar.LENGTH_INDEFINITE
            )

            // Get the snack bar root view
            val snackRootView = snackbar.view

            // Get the snack bar text view
            val snackTextView = snackRootView
                .findViewById<TextView>(
                    com.google.android.material.R.id.snackbar_text)

            // Get the snack bar action view
            val snackActionView = snackRootView
                .findViewById<Button>(
                    com.google.android.material.R.id.snackbar_action)

            // Change the snack bar root view background color
            snackRootView.setBackgroundColor(
                Color.parseColor("#A4DDED"))

            // Change the snack bar text view text color
            snackTextView.setTextColor(
                Color.parseColor("#2D383A"))

            // Change snack bar text view text style
            snackTextView.setTypeface(
                Typeface.MONOSPACE,Typeface.BOLD_ITALIC)

            // Change the snack bar action button text color
            snackActionView.setTextColor(
                Color.parseColor("#002147"))

            // Set an action for snack bar
            snackbar.setAction("Hide Me") {
                // Hide the snack bar
                snackbar.dismiss()
            }

            // Finally, display the snack bar
            snackbar.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:id="@+id/rootLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="24dp"
    android:background="#F8F8F8">

    <Button
        android:id="@+id/buttonSimple"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Simple Snackbar"
        android:textAllCaps="false"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/buttonAction"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="Snackbar Action"
        android:textAllCaps="false"
        app:layout_constraintStart_toStartOf="@+id/buttonSimple"
        app:layout_constraintTop_toBottomOf="@+id/buttonSimple" />

    <Button
        android:id="@+id/buttonStyle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="Snackbar Style"
        android:textAllCaps="false"
        app:layout_constraintStart_toStartOf="@+id/buttonAction"
        app:layout_constraintTop_toBottomOf="@+id/buttonAction" />

</androidx.constraintlayout.widget.ConstraintLayout>






Labels:

Popular posts from this blog

Restricting Jetpack Compose TextField to Numeric Input Only

Jetpack Compose has revolutionized Android development with its declarative approach, enabling developers to build modern, responsive UIs more efficiently. Among the many components provided by Compose, TextField is a critical building block for user input. However, ensuring that a TextField accepts only numeric input can pose challenges, especially when considering edge cases like empty fields, invalid characters, or localization nuances. In this blog post, we'll explore how to restrict a Jetpack Compose TextField to numeric input only, discussing both basic and advanced implementations. Why Restricting Input Matters Restricting user input to numeric values is a common requirement in apps dealing with forms, payment entries, age verifications, or any data where only numbers are valid. Properly validating input at the UI level enhances user experience, reduces backend validation overhead, and minimizes errors during data processing. Compose provides the flexibility to implement ...
Read more

jetpack compose - TextField remove underline

Compose TextField Remove Underline The TextField is the text input widget of android jetpack compose library. TextField is an equivalent widget of the android view system’s EditText widget. TextField is used to enter and modify text. The following jetpack compose tutorial will demonstrate to us how we can remove (actually hide) the underline from a TextField widget in an android application. We have to apply a simple trick to remove (hide) the underline from the TextField. The TextField constructor’s ‘colors’ argument allows us to set or change colors for TextField’s various components such as text color, cursor color, label color, error color, background color, focused and unfocused indicator color, etc. Jetpack developers can pass a TextFieldDefaults.textFieldColors() function with arguments value for the TextField ‘colors’ argument. There are many arguments for this ‘TextFieldDefaults.textFieldColors()’function such as textColor, disabledTextColor, backgroundColor, cursorC...
Read more

jetpack compose - Image clickable

Compose Image Clickable The Image widget allows android developers to display an image object to the app user interface using the jetpack compose library. Android app developers can show image objects to the Image widget from various sources such as painter resources, vector resources, bitmap, etc. Image is a very essential component of the jetpack compose library. Android app developers can change many properties of an Image widget by its modifiers such as size, shape, etc. We also can specify the Image object scaling algorithm, content description, etc. But how can we set a click event to an Image widget in a jetpack compose application? There is no built-in property/parameter/argument to set up an onClick event directly to the Image widget. This android application development tutorial will demonstrate to us how we can add a click event to the Image widget and make it clickable. Click event of a widget allow app users to execute a task such as showing a toast message by cli...
Read more