How to set the Android wallpaper image programmatically in Kotlin

This example demonstrates how to set the Android wallpaper image programmatically in Kotlin.

Step 1 − Create a new project in Android Studio, go to File ? New Project and fill all required details to create a new project.

Example

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
   android:id="@+id/textView"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_centerHorizontal="true"
   android:layout_marginTop="50dp"
   android:padding="8dp"
   android:text="Tutorials Point"
   android:textColor="@color/colorPrimaryDark"
   android:textSize="48sp"
   android:textStyle="bold" />
<Button
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_centerInParent="true"
   android:onClick="setWallpaper"
   android:text="Set Wallpaper"
   android:textColor="@android:color/background_dark"
   android:textStyle="bold" />
</RelativeLayout>

Step 3 − Add the following code to src/MainActivity.kt

Example

import android.graphics.Bitmap
import android.graphics.BitmapFactory
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.Toast
class MainActivity : AppCompatActivity() {
   override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
      setContentView(R.layout.activity_main)

      title = "KotlinApp"
   }

   fun setWallpaper(view: View) {
      val bitmap: Bitmap =
      BitmapFactory.decodeResource(resources, R.drawable.wallpaper)
      val wallpaperManager = WallpaperManager.getInstance(baseContext)
      wallpaperManager.setBitmap(bitmap)
      Toast.makeText(this, "Wallpaper set!", Toast.LENGTH_SHORT).show()
   }
}

Step 4 − Add the following code to androidManifest.xml

Example

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="app.com.q1">
<uses-permission android:name="android.permission.SET_WALLPAPER" />
   <application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
      <activity android:name=".MainActivity">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen

Azhar

Updated on: 23-May-2020

1K+ Views

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