public class MySurfaceView extends SurfaceView implementsSurfaceHolder.Callback {

    private Paint paint=null;

    public MySurfaceView(Context context) {

        super(context);

        paint = new Paint();

        paint.setColor(Color.RED);

        getHolder().addCallback(this);

    }

    public void draw(){

        Canvas canvas = getHolder().lockCanvas();

        canvas.drawColor(Color.WHITE);

        canvas.drawLine(0,0,getWidth()/2,getHeight()/2,paint);

        canvas.drawCircle(getWidth()/2,getHeight()/2,50,paint);

        canvas.drawRect(0,0,100,100,paint);

        getHolder().unlockCanvasAndPost(canvas);

    }

    @Override

    public void surfaceCreated(SurfaceHolder holder) {

        draw();

    }

    @Override

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

    }

    @Override

    public void surfaceDestroyed(SurfaceHolder holder) {

    }

}

protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(new MySurfaceView(this));

    }