MainActivity.kt
package com.example.jetpack
import android.graphics.Bitmap
import android.graphics.drawable.Drawable
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.core.content.ContextCompat
import androidx.core.graphics.drawable.toBitmap
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// Image source
// https://pixabay.com/photos/anemone-blue-flower-blossom-bloom-2396299/
// Get drawable from resource
val drawable:Drawable? = ContextCompat.getDrawable(this,R.drawable.blue_flower)
// Convert drawable to bitmap
val bitmap:Bitmap? = drawable?.toBitmap()
// Convert drawable to bitmap with specific width height
val bitmap2:Bitmap? = drawable?.toBitmap(
drawable.intrinsicWidth/25, // width
drawable.intrinsicHeight/25 // height
)
button.setOnClickListener {
bitmap?.apply { imageView.setImageBitmap(this) }
}
button2.setOnClickListener {
bitmap2?.apply { imageView.setImageBitmap(this) }
}
}
}
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"
tools:context=".MainActivity">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:backgroundTint="#008000"
android:text="Drawable To Bitmap"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="12dp"
android:backgroundTint="#4B5320"
android:text="Drawable To Bitmap With Size"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.501"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/button" />
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="250dp"
android:layout_marginTop="16dp"
android:scaleType="fitCenter"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/button2"
tools:srcCompat="@tools:sample/avatars[7]" />
</androidx.constraintlayout.widget.ConstraintLayout>
build.gradle dependencies[add]
// android ktx
implementation 'androidx.core:core-ktx:1.2.0'


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