android 画图 surfaceView

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

MySurface surface=new MySurface(MainActivity.this);

setContentView(surface);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

}

public class MySurface extends SurfaceView implements Callback {

private SurfaceHolder holder;

private MyThread myThread;

public MySurface(Context context) {

super(context);

// TODO Auto-generated constructor stub

holder = getHolder();

holder.addCallback(this);

paint=new Paint();

}

// SurfaceView发生变化的时候调用

@Override

public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {

// TODO Auto-generated method stub

}

// SurfaceView 创建的时候调用

@Override

public void surfaceCreated(SurfaceHolder arg0) {

// TODO Auto-generated method stub

isRunning=true;

new MyThread().start();

}

// SurfaceView 销毁的时候调用

@Override

public void surfaceDestroyed(SurfaceHolder arg0) {

// TODO Auto-generated method stub

isRunning=false;

}

public boolean isRunning=false;

private Paint paint;

class MyThread extends Thread{

private int x,y;

@Override

public void run() {

// TODO Auto-generated method stub

super.run();

while(isRunning){

//更新界面 50毫秒

draw();

try {

Thread.sleep(50);

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

private void draw() {

// TODO Auto-generated method stub

//锁定界面，拿到画板

// paint.setColor(0xFFFFFFFF);

// paint.setTextSize(25);

Canvas canvas = holder.lockCanvas();

canvas.drawColor(0xFFFF0000);

// canvas.drawText("SurfaceView", x, y, paint);

//decodeResource 参数：1——资源管理器 2——图片ID

Bitmap bitmap= BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);

//显示画板内容

canvas.drawBitmap(bitmap, x, y, paint);

if(canvas!=null)

holder.unlockCanvasAndPost(canvas);

x++;

y++;

}

}

}