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       网上也有讲开发动态壁纸的博客，我在看书编写这个例子时，发现我编写的动态壁纸找不到，后来发现是没有将我编写的WallpaperService跑起来，而书上和有些博客照搬写到是不需要Activity的，我发现没有Activity的话，程序都跑不起。下面讲下我的做法:

第一步：编写LiveWallpaper类继承WallpaperService,代码如下：

public class LiveWallpaper extends WallpaperService{    private Bitmap bitmap;    //  实现动态壁纸必须要实现的抽象方法    @Override    public Engine onCreateEngine() {        bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.me);        return new MyEngine();    }    class MyEngine extends Engine{        private boolean mVisible;        //  记录当前用户动作发生的位置        private float mTouchX = -1;        private float mTouchY = -1;        //  记录要绘制的矩形的数量        private int count = 1;        //  记录第一个矩形所需坐标变换的X、Y坐标的偏移        private int originX = 50,originY = 50;        //  定义画笔        private Paint mPaint = new Paint();        Handler mHandler = new Handler();        private final Runnable drawTarget = new Runnable() {            @Override            public void run() {                drawFrame();            }        };        @Override        public void onCreate(SurfaceHolder surfaceHolder) {            super.onCreate(surfaceHolder);            //  初始化画笔            mPaint.setARGB(76,0,0,255);            mPaint.setAntiAlias(true);            mPaint.setStyle(Paint.Style.FILL);            //  设置壁纸的触碰事件为true            setTouchEventsEnabled(true);        }        @Override        public void onVisibilityChanged(boolean visible) {            super.onVisibilityChanged(visible);            mVisible = visible;            if(visible){                drawFrame();            }else{                //  如果界面不可见，删除回调                mHandler.removeCallbacks(drawTarget);            }        }        @Override        public void onOffsetsChanged(float xOffset, float yOffset, float xOffsetStep, float yOffsetStep, int xPixelOffset, int yPixelOffset) {            super.onOffsetsChanged(xOffset, yOffset, xOffsetStep, yOffsetStep, xPixelOffset, yPixelOffset);            drawFrame();        }        @Override        public void onDestroy() {            super.onDestroy();            //  删除回调            mHandler.removeCallbacks(drawTarget);        }        @Override        public void onTouchEvent(MotionEvent event) {            //   检测到滑动操作            if(event.getAction() == MotionEvent.ACTION_MOVE){                mTouchX = event.getX();                mTouchY = event.getY();            }else{                mTouchX = -1;                mTouchY = -1;            }            super.onTouchEvent(event);        }        private void drawFrame(){            final SurfaceHolder holder = getSurfaceHolder();            Canvas c = null;            try{               c = holder.lockCanvas();               if(c != null){                   c.drawColor(0xffffffff);                   //  在触碰点绘制图像                   drawTouchPoint(c);                   mPaint.setAlpha(76);                   c.translate(originX,originY);                   //  采用循环绘制count个图形                   for(int i = 0; i < count; i++){                       c.translate(80,0);                       c.scale(0.95f,0.95f);                       c.rotate(20f);                       c.drawRect(0,0,150,75,mPaint);                   }               }            }finally {                if(c != null){                    holder.unlockCanvasAndPost(c);                }            }            //  调度下一次重绘            mHandler.removeCallbacks(drawTarget);            if(mVisible){                count++;                if(count >= 50){                    Random rand = new Random();                    count  = 1;                    originX += (rand.nextInt(60)-30);                    originY += (rand.nextInt(60)-30);                    try{                        Thread.sleep(500);                    } catch (InterruptedException e) {                        e.printStackTrace();                    }                }                //  每隔0.1秒执行drawTarget一次                mHandler.postDelayed(drawTarget,100);            }        }        private void drawTouchPoint(Canvas c){            if(mTouchX >= 0 && mTouchY >= 0){                //  设置画笔的透明度                mPaint.setAlpha(255);                c.drawBitmap(bitmap,mTouchX,mTouchY,mPaint);            }        }    }}

   
    android:permission="android.permission.BIND_WALLPAPER">    
            
         
       
     
     
    然后在res文件下下新建xml文件夹，在xml文件夹中建立livewallpaper.xml文件，livewallpaper.xml文件中的代码如下:

   
   第三步：在MainActivity中编写代码，运行WallpaperService,代码如下：

public class MainActivity extends Activity{    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        Intent intent = new Intent(this,LiveWallpaper.class);        //  启动设置的动态壁纸的Service        startService(intent);    }}

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