Live wallpapers - are richer, animated, interactive backgrounds on Homescreen.
In this post I will describe step by step "How to Create LiveWallpaper " .
In this example I have created a LiveWallpaper in which a Fish is moving left to right.
The example is too simple and has been described in manner that you can easily understand.
Step 2: edit your manifest file add service and feature.
Step 3: create a service class which extends WallpaperService class.
Step 1: create a xml folder inside res folder.
inside xml folder create mywallpaper.xml file
<?xml version="1.0" encoding="UTF-8"?>
<wallpaper
xmlns:android="http://schemas.android.com/apk/res/android"
android:thumbnail="@drawable/fish"
android:description="@string/wallpaper_description"
/>
here thumbnail is the image that will be shown in list of livewallpapers and description attribute is the description of your live wallpaper.
Also add following in your string.xml file inside values folder
<string name="wallpaper_description">Fish Aquarium</string>
Step 2: Edit your Manifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.livewallpapertutorial"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="16" />
<uses-feature
android:name="android.software.live_wallpaper"
android:required="true" >
</uses-feature>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<service
android:name="LiveWallpaperService"
android:enabled="true"
android:label="Wallpaper Example "
android:permission="android.permission.BIND_WALLPAPER" >
<intent-filter>
<action android:name="android.service.wallpaper.WallpaperService" >
</action>
</intent-filter>
<meta-data
android:name="android.service.wallpaper"
android:resource="@xml/mywallpaper" >
</meta-data>
</service>
</application>
</manifest>
Step 3: create a service class which extends WallpaperService.
this class is the base class for all live wallpapers in the system. You must implement the
The
public class LiveWallpaperService extends WallpaperService
{
int x,y;
public void onCreate()
{
super.onCreate();
}
public void onDestroy()
{
super.onDestroy();
}
public Engine onCreateEngine()
{
return new MyWallpaperEngine();
}
class MyWallpaperEngine extends Engine
{
private final Handler handler = new Handler();
private final Runnable drawRunner = new Runnable() {
@Override
public void run() {
draw();
}
};
private boolean visible = true;
public Bitmap image1,backgroundImage;
MyWallpaperEngine()
{
// get the fish and background image references
image1 = BitmapFactory.decodeResource(getResources(),R.drawable.fish);
backgroundImage = BitmapFactory.decodeResource(getResources(),R.drawable.background);
x=-130; // initialize x position
y=200; // initialize y position
}
public void onCreate(SurfaceHolder surfaceHolder)
{
super.onCreate(surfaceHolder);
}
@Override
public void onVisibilityChanged(boolean visible)
{
this.visible = visible;
// if screen wallpaper is visible then draw the image otherwise do not draw
if (visible)
{
handler.post(drawRunner);
}
else
{
handler.removeCallbacks(drawRunner);
}
}
@Override
public void onSurfaceDestroyed(SurfaceHolder holder)
{
super.onSurfaceDestroyed(holder);
this.visible = false;
handler.removeCallbacks(drawRunner);
}
public void onOffsetsChanged(float xOffset, float yOffset, float xStep, float yStep, int xPixels, int yPixels)
{
draw();
}
void draw()
{
final SurfaceHolder holder = getSurfaceHolder();
Canvas c = null;
try
{
c = holder.lockCanvas();
// clear the canvas
c.drawColor(Color.BLACK);
if (c != null)
{
// draw the background image
c.drawBitmap(backgroundImage, 0, 0, null);
// draw the fish
c.drawBitmap(image1, x,y, null);
// get the width of canvas
int width=c.getWidth();
// if x crosses the width means x has reached to right edge
if(x>width+100)
{
// assign initial value to start with
x=-130;
}
// change the x position/value by 1 pixel
x=x+1;
}
}
finally
{
if (c != null)
holder.unlockCanvasAndPost(c);
}
handler.removeCallbacks(drawRunner);
if (visible)
{
handler.postDelayed(drawRunner, 10); // delay 10 mileseconds
}
}
}
}
Run the application and set the Wallpaper.( Long Press on Screen ->Set Wallpaper -> HomeScreen -> Live Wallpapers -> select your Live wall paper)
In this post I will describe step by step "How to Create LiveWallpaper " .
The Android Development Tutorials blog contains Basic as well as Advanced android tutorials.Go to Android Development Tutorials to get list of all Android Tutorials.
Android Live Wallpaper Example
In this example I have created a LiveWallpaper in which a Fish is moving left to right.
The example is too simple and has been described in manner that you can easily understand.
How to create a Live Wallpaper
Step 1: create a xml file which will describe your wallpaper.Step 2: edit your manifest file add service and feature.
Step 3: create a service class which extends WallpaperService class.
Step 1: create a xml folder inside res folder.
inside xml folder create mywallpaper.xml file
<?xml version="1.0" encoding="UTF-8"?>
<wallpaper
xmlns:android="http://schemas.android.com/apk/res/android"
android:thumbnail="@drawable/fish"
android:description="@string/wallpaper_description"
/>
here thumbnail is the image that will be shown in list of livewallpapers and description attribute is the description of your live wallpaper.
Also add following in your string.xml file inside values folder
<string name="wallpaper_description">Fish Aquarium</string>
Step 2: Edit your Manifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.livewallpapertutorial"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="16" />
<uses-feature
android:name="android.software.live_wallpaper"
android:required="true" >
</uses-feature>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<service
android:name="LiveWallpaperService"
android:enabled="true"
android:label="Wallpaper Example "
android:permission="android.permission.BIND_WALLPAPER" >
<intent-filter>
<action android:name="android.service.wallpaper.WallpaperService" >
</action>
</intent-filter>
<meta-data
android:name="android.service.wallpaper"
android:resource="@xml/mywallpaper" >
</meta-data>
</service>
</application>
</manifest>
Step 3: create a service class which extends WallpaperService.
this class is the base class for all live wallpapers in the system. You must implement the
onCreateEngine() method .The
Engine class defines the life cycle methods, as for example onCreate(), onSurfaceCreated(), onVisibilityChanged(), onOffsetsChanged(), onTouchEvent() and onCommand(). public class LiveWallpaperService extends WallpaperService
{
int x,y;
public void onCreate()
{
super.onCreate();
}
public void onDestroy()
{
super.onDestroy();
}
public Engine onCreateEngine()
{
return new MyWallpaperEngine();
}
class MyWallpaperEngine extends Engine
{
private final Handler handler = new Handler();
private final Runnable drawRunner = new Runnable() {
@Override
public void run() {
draw();
}
};
private boolean visible = true;
public Bitmap image1,backgroundImage;
MyWallpaperEngine()
{
// get the fish and background image references
image1 = BitmapFactory.decodeResource(getResources(),R.drawable.fish);
backgroundImage = BitmapFactory.decodeResource(getResources(),R.drawable.background);
x=-130; // initialize x position
y=200; // initialize y position
}
public void onCreate(SurfaceHolder surfaceHolder)
{
super.onCreate(surfaceHolder);
}
@Override
public void onVisibilityChanged(boolean visible)
{
this.visible = visible;
// if screen wallpaper is visible then draw the image otherwise do not draw
if (visible)
{
handler.post(drawRunner);
}
else
{
handler.removeCallbacks(drawRunner);
}
}
@Override
public void onSurfaceDestroyed(SurfaceHolder holder)
{
super.onSurfaceDestroyed(holder);
this.visible = false;
handler.removeCallbacks(drawRunner);
}
public void onOffsetsChanged(float xOffset, float yOffset, float xStep, float yStep, int xPixels, int yPixels)
{
draw();
}
void draw()
{
final SurfaceHolder holder = getSurfaceHolder();
Canvas c = null;
try
{
c = holder.lockCanvas();
// clear the canvas
c.drawColor(Color.BLACK);
if (c != null)
{
// draw the background image
c.drawBitmap(backgroundImage, 0, 0, null);
// draw the fish
c.drawBitmap(image1, x,y, null);
// get the width of canvas
int width=c.getWidth();
// if x crosses the width means x has reached to right edge
if(x>width+100)
{
// assign initial value to start with
x=-130;
}
// change the x position/value by 1 pixel
x=x+1;
}
}
finally
{
if (c != null)
holder.unlockCanvasAndPost(c);
}
handler.removeCallbacks(drawRunner);
if (visible)
{
handler.postDelayed(drawRunner, 10); // delay 10 mileseconds
}
}
}
}
Run the application and set the Wallpaper.( Long Press on Screen ->Set Wallpaper -> HomeScreen -> Live Wallpapers -> select your Live wall paper)
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