MainActivity.kt
package com.example.jetpack
import android.graphics.BitmapFactory
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.core.graphics.scale
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// get bitmap from drawable resource
val bitmap = BitmapFactory.decodeResource(resources,R.drawable.cfsuman)
// scale bitmap using android ktx
val scaledBitmap = bitmap.scale(
300, // width
300, // height
false // filter
)
imageView.setImageBitmap(bitmap)
imageView2.setImageBitmap(scaledBitmap)
}
}
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">
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:srcCompat="@tools:sample/avatars[4]" />
<ImageView
android:id="@+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/imageView"
tools:srcCompat="@tools:sample/avatars[13]" />
</androidx.constraintlayout.widget.ConstraintLayout>
build.gradle dependencies[add]
// android ktx
implementation 'androidx.core:core-ktx:1.2.0'
build.gradle [add]
android {
kotlinOptions {
jvmTarget = JavaVersion.VERSION_1_8.toString()
}
}

- kotlin ktx - AbsoluteSizeSpan RelativeSizeSpan
- kotlin ktx - AlignmentSpan
- kotlin ktx - ClickableSpan
- kotlin ktx - MaskFilterSpan blur
- kotlin ktx - IconMarginSpan
- kotlin ktx - ImageSpan
- kotlin ktx - Scale bitmap keep aspect ratio
- kotlin ktx - View to bitmap
- kotlin ktx - View padding programmatically
- kotlin ktx - View margin programmatically