Android SurfaceView的基本用法

说明：

第一步：继承SurfaceView 并实现Callback，Runable

第二步：初始化SurfaceHolder mHolder,并添加事件

mHolder = getHolder();

mHolder.addCallback(this);

第三步：在public void surfaceCreated方法里开启线程， 在public void surfaceDestroyed关闭线程

第四步：在public void run()方法里实现draw方法

第五步：如果要添加背景，在draw()方法里实现，在onSizeChanged（）方法里可得到改变后的视图宽高及矩形矩阵

具体代码如下：

public class FlyBirdView extends SurfaceView implements Callback, Runnable {
private SurfaceHolder mHolder;
// private Thread mThread;
private ExecutorService mPool;
private Canvas mCanvas;
private boolean isRunnging;// 是否运行

// 二.设置背景
private Bitmap mBgBitmap;
//当前View的尺寸
private int mWidth;
private int mHeight;
private RectF mGamePanelRect = new RectF();

// ----构造函数处理---------------------------------------------
public FlyBirdView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}

public FlyBirdView(Context context) {
this(context, null);
}

public FlyBirdView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}

private void init() {
// -初始化holer-----------------------
mHolder = getHolder();
mHolder.addCallback(this);
setZOrderOnTop(true);
// 设置画布 背景透明
mHolder.setFormat(PixelFormat.TRANSLUCENT);

// --焦点设置----------------------------
setFocusable(true);
// 设置触屏
setFocusableInTouchMode(true);
// 设置常亮
setKeepScreenOn(true);

// --背景设置--------------------------------
mGamePanelRect = new RectF();
mBgBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.bgbird);

}

@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
mWidth = w;
mHeight = h;
mGamePanelRect.set(0, 0, w, h);
super.onSizeChanged(w, h, oldw, oldh);
}

@Override
public void run() {
while (isRunnging) {
long start = System.currentTimeMillis();
draw();
long end = System.currentTimeMillis();
if (start - end < 50) {
SystemClock.sleep(50 - (start - end));
}
}
}

private void draw() {
try {
if (mHolder != null) {
mCanvas = mHolder.lockCanvas();

if (mCanvas != null) {
//绘制背景
drawBg();
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (mHolder != null && mCanvas != null) {
mHolder.unlockCanvasAndPost(mCanvas);
}

}

}

private void drawBg() {
mCanvas.drawBitmap(mBgBitmap,null, mGamePanelRect, null);
}

// ---callback监听------------------------------------------------------
@Override
public void surfaceCreated(SurfaceHolder holder) {
// -线程处理--------------------------
isRunnging = true;
mPool = Executors.newFixedThreadPool(5);
// mThread = new Thread(this);
// mThread.start();
mPool.execute(this);
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// 通知关闭线程
isRunnging = false;
}

}