What is Live Wallpapers
Live Wallpapers is an animated, interactive wallpaper for the Android home screen. Live wallpapers are similar to other Android apps and can use most of the same functionsHow to create a live wallpaper
To create live wallpapers, you need to create an XML file that describes your wallpaper. This file must contain a description of the application and may contain previews and links to activity priority Activities that allow customizing live wallpapers.
You also create a service which must extend the WallpaperService class
You must implement the onCreateEngine() method and return an object of type android.service.wallpaper.WallpaperService.Engine
You should also enter in the AndroidManifest.xml file of the application that your application uses the android.software.live_wallpaper feature. This will prevent that your wallpaper can be installed on devices which do not support live wallpapers.
Intent to set the wallpaper
public void onClick(View view) {Android Wallpaper Example
Intent intent = new Intent(
WallpaperManager.ACTION_CHANGE_LIVE_WALLPAPER);
intent.putExtra(WallpaperManager.EXTRA_LIVE_WALLPAPER_COMPONENT,
new ComponentName(this, MyWallpaperService.class));
startActivity(intent);
}
Create the /res/xml folder and create the livemwallpaper.xml file.
<?xml version="1.0" encoding="UTF-8"?>Change your AndroidManifest.xml to the following to define your MyWallpaperService service. Also define the uses-feature.
<wallpaper
xmlns:android="http://schemas.android.com/apk/res/android"
android:thumbnail="@drawable/icon"
android:description="@string/wallpaper_description"
android:settingsActivity="de.vogella.android.wallpaper.MyPreferencesActivity"/>
<?xml version="1.0" encoding="utf-8"?>We create the MyPoint class to save the elements we have drawn.
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="de.vogella.android.wallpaper"
android:versionCode="1"
android:versionName="1.0" >
<application
android:icon="@drawable/icon"
android:label="@string/app_name" >
<service
android:name="MyWallpaperService"
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>
<activity
android:name=".MyPreferencesActivity"
android:exported="true"
android:label="@string/app_name"
android:theme="@android:style/Theme.Light.WallpaperSettings" >
</activity>
<activity
android:name=".SetWallpaperActivity"
android:label="@string/app_name"
android:theme="@android:style/Theme.Light.WallpaperSettings" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-sdk android:minSdkVersion="10" />
<uses-feature
android:name="android.software.live_wallpaper"
android:required="true" >
</uses-feature>
</manifest>
public class MyPoint {Create a new activity. Create the prefs.xml preference file in the res/xml folder.
String text;
private int x;
private int y;
public MyPoint(String text, int x, int y) {
this.text = text;
this.x = x;
this.y = y;
}
}
<?xml version="1.0" encoding="utf-8"?>Create a new activity called MyPreferencesActivity and the following class.
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<CheckBoxPreference android:key="touch"
android:title="Enable Touch"></CheckBoxPreference>
<EditTextPreference android:key="numberOfCircles"
android:title="Number of Circles"></EditTextPreference>
</PreferenceScreen>
public class MyPreferencesActivity extends PreferenceActivity {Create the following coding for the Wallpaper service.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.prefs);
// add a validator to the "numberofCircles" preference so that it only
// accepts numbers
Preference circlePreference = getPreferenceScreen().findPreference(
"numberOfCircles");
// add the validator
circlePreference.setOnPreferenceChangeListener(numberCheckListener);
}
/**
* Checks that a preference is a valid numerical value
*/
Preference.OnPreferenceChangeListener numberCheckListener = new OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
// check that the string is an integer
if (newValue != null && newValue.toString().length() > 0
&& newValue.toString().matches("\\d*")) {
return true;
}
// If now create a message to the user
Toast.makeText(MyPreferencesActivity.this, "Invalid Input",
Toast.LENGTH_SHORT).show();
return false;
}
};
}
public class MyWallpaperService extends WallpaperService {
@Override
public Engine onCreateEngine() {
return new MyWallpaperEngine();
}
private class MyWallpaperEngine extends Engine {
private final Handler handler = new Handler();
private final Runnable drawRunner = new Runnable() {
@Override
public void run() {
draw();
}
};
private List<MyPoint> circles;
private Paint paint = new Paint();
private int width;
int height;
private boolean visible = true;
private int maxNumber;
private boolean touchEnabled;
public MyWallpaperEngine() {
SharedPreferences prefs = PreferenceManager
.getDefaultSharedPreferences(MyWallpaperService.this);
maxNumber = Integer
.valueOf(prefs.getString("numberOfCircles", "4"));
touchEnabled = prefs.getBoolean("touch", false);
circles = new ArrayList<MyPoint>();
paint.setAntiAlias(true);
paint.setColor(Color.WHITE);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeJoin(Paint.Join.ROUND);
paint.setStrokeWidth(10f);
handler.post(drawRunner);
}
@Override
public void onVisibilityChanged(boolean visible) {
this.visible = visible;
if (visible) {
handler.post(drawRunner);
} else {
handler.removeCallbacks(drawRunner);
}
}
}
@Override
public void onSurfaceDestroyed(SurfaceHolder holder) {
super.onSurfaceDestroyed(holder);
this.visible = false;
handler.removeCallbacks(drawRunner);
}
@Override
public void onSurfaceChanged(SurfaceHolder holder, int format,
int width, int height) {
this.width = width;
this.height = height;
super.onSurfaceChanged(holder, format, width, height);
}
@Override
public void onTouchEvent(MotionEvent event) {
if (touchEnabled) {
float x = event.getX();
float y = event.getY();
SurfaceHolder holder = getSurfaceHolder();
Canvas canvas = null;
try {
canvas = holder.lockCanvas();
if (canvas != null) {
canvas.drawColor(Color.BLACK);
circles.clear();
circles.add(new MyPoint(
String.valueOf(circles.size() + 1), x, y));
drawCircles(canvas, circles);
}
} finally {
if (canvas != null)
holder.unlockCanvasAndPost(canvas);
}
super.onTouchEvent(event);
}
}
private void draw() {
SurfaceHolder holder = getSurfaceHolder();
Canvas canvas = null;
try {
canvas = holder.lockCanvas();
if (canvas != null) {
if (circles.size() >= maxNumber) {
circles.clear();
}
int x = (int) (width * Math.random());
int y = (int) (height * Math.random());
circles.add(new MyPoint(String.valueOf(circles.size() + 1),
x, y));
drawCircles(canvas, circles);
}
} finally {
if (canvas != null)
holder.unlockCanvasAndPost(canvas);
}
handler.removeCallbacks(drawRunner);
if (visible) {
handler.postDelayed(drawRunner, 5000);
}
}
// Surface view requires that all elements are drawn completely
private void drawCircles(Canvas canvas, List<MyPoint> circles) {
canvas.drawColor(Color.BLACK);
for (MyPoint point : circles) {
canvas.drawCircle(point.x, point.y, 20.0f, paint);
}
}
}
This Button should use the onClick property to point to the onClick method.
public class SetWallpaperActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void onClick(View view) {
Intent intent = new Intent(
WallpaperManager.ACTION_CHANGE_LIVE_WALLPAPER);
intent.putExtra(WallpaperManager.EXTRA_LIVE_WALLPAPER_COMPONENT,
new ComponentName(this, MyWallpaperService.class));
startActivity(intent);
}
}
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