动态桌面程序框架

0.简介

        参照动态桌面官方范例源代码 —— CubeWallpaper可以快速开发自己的动态桌面，但实际上一个完整的程序还需要其他的资源文件，在这里以准备用的BallWallpaper为例子贴出所有代码。

1.源文件（不需要Activity，只有一个BallWallpaper.java）

package com.tobe;import android.graphics.*;import android.os.Handler;import android.service.wallpaper.WallpaperService;import android.view.MotionEvent;import android.view.SurfaceHolder;public class BallWallpaper extends WallpaperService {@Overridepublic Engine onCreateEngine() {return new BallEngine();}class BallEngine extends Engine {private boolean isVisible;private float xTouch = -1;private float yTouch = -1;private float xBall = 15;private float yBall = 20;private Paint paint = new Paint();Handler mHandler = new Handler();private final Runnable drawTarget = new Runnable() {public void run() {draw();}};@Overridepublic void onCreate(SurfaceHolder surfaceHolder) {super.onCreate(surfaceHolder);paint.setColor(0xffffffff);paint.setAntiAlias(true);paint.setStrokeWidth(2);paint.setStrokeCap(Paint.Cap.ROUND);paint.setStyle(Paint.Style.STROKE);setTouchEventsEnabled(true);}@Overridepublic void onDestroy() {super.onDestroy();mHandler.removeCallbacks(drawTarget);}@Overridepublic void onVisibilityChanged(boolean visible) {isVisible = visible;if (visible) {draw();} else {mHandler.removeCallbacks(drawTarget);}}@Overridepublic void onOffsetsChanged(float xOffset, float yOffset, float xStep,float yStep, int xPixels, int yPixels) {draw();}@Overridepublic void onTouchEvent(MotionEvent event) {if (event.getAction() == MotionEvent.ACTION_MOVE) {xTouch = event.getX();yTouch = event.getY();} else {xTouch = -1;yTouch = -1;}super.onTouchEvent(event);}private void logic(){}private void draw() {final SurfaceHolder holder = getSurfaceHolder();Canvas c = null;try {c = holder.lockCanvas();if (c != null) {c.save();c.drawColor(0xff000000);drawTouchPoint(c);c.drawCircle(xBall, yBall, 80, paint);c.restore();}} finally {if (c != null)holder.unlockCanvasAndPost(c);}mHandler.removeCallbacks(drawTarget);if (isVisible) {xBall += 15;yBall += 20;if (xBall > 320)xBall = 15;if (yBall > 400)yBall= 20;mHandler.postDelayed(drawTarget, 100);}}private void drawTouchPoint(Canvas c) {if (xTouch >= 0 && yTouch >= 0) {c.drawCircle(xTouch, yTouch, 40, paint);}}}}

2.res文件（可以自己导入icon，还有xml文件夹下的ballwallpaper.xml）

<?xml version="1.0" encoding="utf-8"?><wallpaper xmlns:android="http://schemas.android.com/apk/res/android"/>

3.配置文件（修改AndroidManifest.xml）

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"  package="com.tobe"  android:versionCode="1"  android:versionName="1.0"><applicationandroid:icon="@drawable/ic_ball"android:label="@string/app_name"><service android:label="@string/app_name"android:name=".BallWallpaper"android:permission="android.permission.BIND_WALLPAPER"><intent-filter><actionandroid:name="android.service.wallpaper.WallpaperService" /></intent-filter><meta-data android:name="android.service.wallpaper"android:resource="@xml/ballwallpaper" /></service></application></manifest> 

4.Done