Set Wallpaper using WallpaperManager

In this exercise, a picture (packed inside our app) will be set as system wallpaper, using WallpaperManager.

* Please note that in order to use WallpaperManager, minimum API level have to be set to 5.




First of all, prepare a picture (wallpaper.png in my case) and save it in /res/drawable/ folder of your project.

main code

package com.exercise.AndroidWallpaper;

import java.io.IOException;

import android.app.Activity;
import android.app.WallpaperManager;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class AndroidWallpaper extends Activity {
 
 Bitmap bitmap;
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
      
       Button buttonSetWallpaper = (Button)findViewById(R.id.set);
       ImageView imagePreview = (ImageView)findViewById(R.id.preview);

       imagePreview.setImageResource(R.drawable.wallpaper);
      
       buttonSetWallpaper.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    WallpaperManager myWallpaperManager
     = WallpaperManager.getInstance(getApplicationContext());
    try {
     myWallpaperManager.setResource(R.drawable.wallpaper);
    } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
    
   }});

   }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   >
<TextView 
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="@string/hello"
   />
<Button
  android:id="@+id/set"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="Set Wallpaper"
  />
<ImageView
  android:id="@+id/preview"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  />
</LinearLayout>

Finally, you have to modify AndroidManifest.xml to grant permission of "android.permission.SET_WALLPAPER".

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.exercise.AndroidWallpaper"
     android:versionCode="1"
     android:versionName="1.0">
   <uses-sdk android:minSdkVersion="5" />
   <uses-permission android:name="android.permission.SET_WALLPAPER"></uses-permission>

   <application android:icon="@drawable/icon" android:label="@string/app_name">
       <activity android:name=".AndroidWallpaper"
                 android:label="@string/app_name">
           <intent-filter>
               <action android:name="android.intent.action.MAIN" />
               <category android:name="android.intent.category.LAUNCHER" />
           </intent-filter>
       </activity>

   </application>
</manifest>

Download the files.