MainActivity.kt
package com.cfsuman.kotlintutorials
import android.app.Activity
import android.content.Context
import android.graphics.*
import android.os.Bundle
import android.widget.*
import java.io.IOException
class MainActivity : Activity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// get the widgets reference from XML layout
val imageView = findViewById<ImageView>(R.id.imageView)
val textView2 = findViewById<TextView>(R.id.textView2)
// get the bitmap from assets folder
val bitmap = assetsToBitmap("flower103.jpg")
bitmap?.apply {
// show original bitmap in first image view
imageView.setImageBitmap(this)
// set bitmap shader as text view paint
textView2.paint.shader = toBitmapShader()
}
}
}
// extension function to get bitmap from assets
fun Context.assetsToBitmap(fileName:String):Bitmap?{
return try {
val stream = assets.open(fileName)
BitmapFactory.decodeStream(stream)
} catch (e: IOException) {
e.printStackTrace()
null
}
}
// extension function to generate bitmap shader
fun Bitmap.toBitmapShader(
tileX:Shader.TileMode = Shader.TileMode.REPEAT,
tileY:Shader.TileMode = Shader.TileMode.REPEAT
):BitmapShader{
return BitmapShader(
this, // bitmap to use inside the shader
tileX, // tiling mode for x to draw the bitmap in
tileY // tiling mode for y to draw the bitmap in
)
}
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:id="@+id/rootLayout"
android:background="#DCDCDC"
android:padding="24dp">
<ImageView
android:id="@+id/imageView"
android:layout_width="0dp"
android:layout_height="250dp"
android:scaleType="centerCrop"
app:layout_constraintEnd_toEndOf="parent"
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="8dp"
android:text="Source Bitmap"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/imageView" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="12dp"
android:fontFamily="sans-serif"
android:text="Android\nBitmap\nShader"
android:textSize="80sp"
android:textStyle="bold"
android:textColor="#000"
android:textAlignment="center"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView" />
</androidx.constraintlayout.widget.ConstraintLayout>
- android kotlin - Bitmap tint solid color
- android kotlin - Bitmap mask
- android kotlin - Bitmap crop center
- android kotlin - Bitmap crop rectangle
- android kotlin - Bitmap crop square
- android kotlin - Rounded corners bitmap
- android kotlin - Circular bitmap with border
- android kotlin - Bitmap crop circular area
- android kotlin - Bitmap add border
- android kotlin - Bitmap add padding
- android kotlin - Bitmap draw shadow
- android kotlin - Draw rectangle on bitmap
- android kotlin - Draw line on bitmap
- android kotlin - Draw circle on bitmap
- android kotlin - Draw text on bitmap