How to Set the Wallpaper of Your Device using Bitmap Class in Android?

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This Android Program lets you create an Activity to set the Wallpaper of your Decive using Java.

Here is source code of the Program to create an Activity to set the Wallpaper of your Decive. The program is successfully compiled and run on a Windows system using Eclipse Ide. The program output is also shown below.

Main Activity

 
package com.example.backgroundapp;
 
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
 
public class MainActivity extends Activity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button =(Button) findViewById(R.id.button1);
 
        button.setOnClickListener(new View.OnClickListener() {
 
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                startActivity(new Intent("com.example.backgroundapp.bakapp"));
            }
        });
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
 
}

Backapp Activity

 
package com.example.backgroundapp;
 
import java.io.IOException;
import java.io.InputStream;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
 
public class bakapp extends Activity implements OnClickListener {
    ImageView display;
    int tophone;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
 
        // to our activity to cover the whole screen
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
 
        setContentView(R.layout.back);
        Button but = (Button) findViewById(R.id.setwallpaper);
        tophone = R.drawable.image4;
        but.setOnClickListener(this);
        display = (ImageView) findViewById(R.id.ivdisplay);
        ImageView image1 = (ImageView) findViewById(R.id.IVimage1);
        ImageView image2 = (ImageView) findViewById(R.id.IVimage2);
        ImageView image3 = (ImageView) findViewById(R.id.IVimage3);
        ImageView image4 = (ImageView) findViewById(R.id.image4);
        ImageView image5 = (ImageView) findViewById(R.id.IVimage5);
 
        image1.setOnClickListener(this);
        image2.setOnClickListener(this);
        image3.setOnClickListener(this);
        image4.setOnClickListener(this);
        image5.setOnClickListener(this);
 
    }
 
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        Toast var;
        switch (v.getId()) {
        case R.id.IVimage1:
            display.setImageResource(R.drawable.image4);
            var = Toast.makeText(bakapp.this, "image changed",
                    Toast.LENGTH_SHORT);
 
            var.show();
 
            tophone = R.drawable.image4;
            break;
        case R.id.IVimage2:
            display.setImageResource(R.drawable.image5);
            var = Toast.makeText(bakapp.this, "image changed",
                    Toast.LENGTH_SHORT);
 
            var.show();
 
            tophone = R.drawable.image5;
            break;
        case R.id.IVimage3:
            display.setImageResource(R.drawable.image6);
            var = Toast.makeText(bakapp.this, "image changed",
                    Toast.LENGTH_SHORT);
 
            var.show();
 
            tophone = R.drawable.image6;
            break;
        case R.id.image4:
            display.setImageResource(R.drawable.image7);
            var = Toast.makeText(bakapp.this, "image changed",
                    Toast.LENGTH_SHORT);
 
            var.show();
 
            tophone = R.drawable.image7;
            break;
        case R.id.IVimage5:
            display.setImageResource(R.drawable.image8);
            var = Toast.makeText(bakapp.this, "image changed",
                    Toast.LENGTH_SHORT);
 
            var.show();
 
            tophone = R.drawable.image8;
            break;
        case R.id.setwallpaper:
            // to set a background we need to use bitmap
            InputStream is = getResources().openRawResource(tophone);
            // to phone is a variable that is updated everytime we click on an
            // ImageView to that imageview resource and by clicking the button
            // we set the phone background to that image.
            Bitmap bm = BitmapFactory.decodeStream(is);
            // decode inputstream is
            try {
                getApplicationContext().setWallpaper(bm);
                // to set the wallpaper of the phone background we need to ask
                // permission from the user so add permission of background from
                // manifest file
 
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            var = Toast.makeText(bakapp.this, "Wallpaper image changed",
                    Toast.LENGTH_SHORT);
 
            var.show();
 
            break;
        }
    }
 
}

Xml

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Main

 
<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
 
    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Application to Change background picture of device"
        android:textSize="30dp" />
 
    <Button
        android:id="@+id/button1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="96dp"
        android:text="Click to launch" />
 
</RelativeLayout>

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Backapp

 
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
 
    <ImageView
        android:id="@+id/ivdisplay"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:layout_gravity="center"
        android:src="@drawable/image4" />
"
    <Button
        android:id="@+id/setwallpaper"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="set image background" >
    </Button>
 
    <HorizontalScrollView
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center" >
 
        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" 
            android:orientation="horizontal">
 
            <ImageView
                android:id="@+id/IVimage1"
                android:layout_width="125dp"
                android:layout_height="125dp"
                android:padding="15dp"
                android:src="@drawable/image4" />
 
            <ImageView
                android:id="@+id/IVimage2"
                android:layout_width="125dp"
                android:layout_height="125dp"
                android:padding="15dp"
                android:src="@drawable/image5" />
 
            <ImageView
                android:id="@+id/IVimage3"
                android:layout_width="125dp"
                android:layout_height="125dp"
                android:padding="15dp"
                android:src="@drawable/image6" />
 
            <ImageView
                android:id="@+id/image4"
                android:layout_width="125dp"
                android:layout_height="125dp"
                android:padding="15dp"
                android:src="@drawable/image7" />
 
            <ImageView
                android:id="@+id/IVimage5"
                android:layout_width="125dp"
                android:layout_height="125dp"
                android:padding="15dp"
                android:src="@drawable/image8" />
        </LinearLayout>
    </HorizontalScrollView>
 
</LinearLayout>

AndroidManifest

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.backgroundapp"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
    <uses-permission android:name="android.permission.SET_WALLPAPER"/>
 
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.backgroundapp.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.example.backgroundapp.bakapp"
            android:label="@string/app_name" 
            android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="com.example.backgroundapp.bakapp" />
 
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
    </application>
 
</manifest>

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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