android学习12——重载SurfaceView一些方法的执行顺序

先看代码

public class SurfaceViewActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(
                WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(new MySurfaceView(this));
    }
}

public class MySurfaceView extends SurfaceView implements SurfaceHolder.Callback {
    private SurfaceHolder surfaceHolder;
    private Paint paint;
    public MySurfaceView(Context context) {
        super(context);
        surfaceHolder = getHolder();
        surfaceHolder.addCallback(this);
        paint = new Paint();
        paint.setColor(Color.RED);
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        Log.i("Logzy", Thread.currentThread().getName() + ":surfaceCreated");
        myDraw();
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        Log.i("Logzy", Thread.currentThread().getName() + ":surfaceChanged");
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        Log.i("Logzy", Thread.currentThread().getName() + ":surfaceDestroyed");
    }

    private void myDraw() {
        Canvas canvas = surfaceHolder.lockCanvas();
        canvas.drawRect(0, 0, 100, 100, paint);
        surfaceHolder.unlockCanvasAndPost(canvas);
    }

    @Override
    public void onWindowFocusChanged(boolean hasWindowFocus) {
        super.onWindowFocusChanged(hasWindowFocus);
        Log.i("Logzy", Thread.currentThread().getName() + ":onWindowFocusChanged");
    }
}

重写了surfaceCreated,surfaceChanged,surfaceDestroyed,onWindowFocusChanged这几个方法.运行程序,结果是:

04-13 08:56:03.111  13682-13682/edu.cgxy.surfaceview I/Logzy﹕ main:surfaceCreated
04-13 08:56:03.111  13682-13682/edu.cgxy.surfaceview I/Logzy﹕ main:surfaceChanged
04-13 08:56:03.141  13682-13682/edu.cgxy.surfaceview I/Logzy﹕ main:onWindowFocusChanged

再把程序切换到后台,结果是

04-13 08:59:49.661  13682-13682/edu.cgxy.surfaceview I/Logzy﹕ main:onWindowFocusChanged
04-13 08:59:49.791  13682-13682/edu.cgxy.surfaceview I/Logzy﹕ main:surfaceDestroyed