SurfaceView也是继承自View，它和我们以前接触到的View（Button、TextView等）最大的不同是，SurfaceView可以有一个单独的线程进行绘制，这个线程区别于UI线程（主线程），因此SurfaceView绘制并不占用主线程资源。

SurfaceView实现通常是自定义，继承SurfaceView并实现SurfaceHolder.Callback接口。使用SurfaceView，所有的绘图工作必须得在Surface 被创建之后才能开始，所以Callback 中的surfaceCreated 和surfaceDestroyed 就成了绘图处理代码的边界。

实现SurfaceHolder.Callback接口需要重写的方法：

　//在surface的大小发生改变时激发
　（1）publicvoidsurfaceChanged(SurfaceHolderholder,intformat,intwidth,intheight){}

//在创建时激发，一般在这里调用画图的线程。
　（2）publicvoidsurfaceCreated(SurfaceHolderholder){}

//销毁时激发，一般在这里将画图的线程停止、释放。　

（3）publicvoidsurfaceDestroyed(SurfaceHolderholder){}

SurfaceHolder有几个重要方法：

// 锁定画布，一般在锁定后就可以通过其返回的画布对象Canvas，在其上面画图等操作了。
(1)、abstract Canvas lockCanvas();
// 锁定画布的某个区域进行画图等..因为画完图后，会调用下面的unlockCanvasAndPost来改变显示内容。
// 相对部分内存要求比较高的游戏来说，可以不用重画dirty外的其它区域的像素，可以提高速度。
(2)、abstract Canvas lockCanvas(Rect dirty);
// 结束锁定画图，并提交改变。

(3)、abstract void unlockCanvasAndPost(Canvas canvas);

//给SurfaceView当前的持有者一个回调对象。

(4)、abstract void addCallback(SurfaceHolder.Callback callback);

下面使用SurfaceView实现墨迹天气的风车效果：

public class WindmillView extends SurfaceView implementsSurfaceHolder.Callback, Runnable {private SurfaceHolder holder;private boolean isRunning = true;/*** 屏幕的像素*/private int screenWidth;private int screenHeiht;private Bitmap windPoint;/*** 风车图片*/private Bitmap Windmill;/*** 背景图片*/private Bitmap viewBg;public WindmillView(Context context) {super(context);this.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));holder = getHolder();holder.addCallback(this);holder.setFormat(PixelFormat.RGBA_8888); // 顶层绘制SurfaceView设成透明getViewSize(context);LoadWindmillImage();}private void LoadWindmillImage() {viewBg = BitmapFactory.decodeResource(getResources(), R.drawable.bg_na);Windmill = BitmapFactory.decodeResource(getResources(),R.drawable.na_windmill);windPoint = BitmapFactory.decodeResource(getResources(),R.drawable.na_point);float percent = percentumW();Log.v("icers", screenWidth + "");int _witdh = (int) (250 / percent);//250是风车基点左侧像素Log.v("icers", _witdh + "");Windmill = Bitmap.createScaledBitmap(Windmill, _witdh * 2, _witdh * 2,true);}// 获取屏幕的分辨率private void getViewSize(Context context) {DisplayMetrics metrics = new DisplayMetrics();WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);windowManager.getDefaultDisplay().getMetrics(metrics);this.screenHeiht = metrics.heightPixels;this.screenWidth = metrics.widthPixels;Log.d("Windmill", "Windmill:"+screenHeiht+"|"+screenWidth);}/*** 获取背景图和风车的比率 ，从而根据这个比例改变各个手机上面的风车图片大小* * * @return*/private float percentumW() {float bg_width = viewBg.getWidth();return  bg_width/screenWidth ;}/*** 获取背景图和风车的比率 ，从而根据这个比例改变各个手机上面的风车图片大小* * * @return*/private float percentumH() {float bg_height = viewBg.getHeight();return  bg_height/(screenHeiht);}@Overridepublic void run() {float rotate = 0;// 旋转角度变量while (isRunning) {Log.i("icer", "Running");Canvas canvas = null;synchronized (this) {try {canvas = holder.lockCanvas();if (canvas != null) {Paint paint = new Paint();paint.setAntiAlias(true);// 对图片抗锯齿paint.setFilterBitmap(true);RectF rect = new RectF(0, 0, screenWidth, screenHeiht);canvas.drawBitmap(viewBg, null, rect, paint);Matrix matrix = new Matrix();matrix.postRotate((rotate += 2) % 360f,Windmill.getWidth() / 2,Windmill.getHeight() / 2);int _dy = (int) (500 /percentumH()); //500是风车基点到背景定点的像素matrix.postTranslate(0, (_dy - (Windmill.getHeight()/2)));canvas.drawBitmap(Windmill, matrix, paint);int _dx = (int) (250 / percentumW());//250是风车基点左侧像素canvas.drawBitmap(windPoint,_dx-windPoint.getWidth()/2,_dy-windPoint.getHeight()/2,paint);Thread.sleep(3);}} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {if (canvas != null) {holder.unlockCanvasAndPost(canvas);}}}}}public void setRunning(boolean state) {isRunning = state;}@Overridepublic void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {// TODO Auto-generated method stub}@Overridepublic void surfaceCreated(SurfaceHolder arg0) {new Thread(this).start();}@Overridepublic void surfaceDestroyed(SurfaceHolder arg0) {// TODO Auto-generated method stubisRunning = false;}}

 @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);requestWindowFeature(Window.FEATURE_NO_TITLE);WindmillView view=new WindmillView(this);setContentView(view);}

整个过程：继承SurfaceView并实现SurfaceHolder.Callback接口 ----> SurfaceView.getHolder()获得SurfaceHolder对象 ---->SurfaceHolder.lockCanvas()获得Canvas对象并锁定画布----> Canvas绘画 ---->SurfaceHolder.unlockCanvasAndPost(Canvas canvas)结束锁定画图，并提交改变，将图形显示。

参考：

http://www.cnblogs.com/plokmju/p/android_SurfaceView.html

http://developer.android.com/reference/android/view/SurfaceView.html

http://blog.csdn.net/luoshengyang/article/details/8661317

http://blog.csdn.net/hellogv/article/details/5986835

http://developer.android.com/reference/android/view/SurfaceHolder.html