Question

我有两个类MyView和MyThread，并希望每隔几毫秒从MyThread类中的一个计时器重新绘制视图。计时器开始运行，但我的视图不会重新绘制，我不明白为什么。这是我的代码：

MyView的：

public class MyView extends SurfaceView{


private MainActivity mainActivity;
private Random random = new Random();

public MyView(Context context) {
super(context);
mainActivity = (MainActivity)context;
}

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    setBackgroundColor(Color.argb(random.nextInt(255),random.nextInt(255),
            random.nextInt(255),random.nextInt(255)));
  }
}

MyThread的：

 public class MyThread implements SurfaceHolder.Callback {

private Timer timer = new Timer();
private MainActivity mainActivity;
private MyView myView;

public MyThread(Context context) {
   mainActivity = (MainActivity) context;
   myView = new MyView(context);
   timer.schedule(new TimerThread(),50,50);
}

class TimerThread extends TimerTask {

    @Override
    public void run() {
        mainActivity.runOnUiThread(new TimerTask() {
            @Override
            public void run() {
                Log.v("Log","Timer run");
                myView.setBackgroundColor(Color.RED);
                myView.invalidate();
            }
        });
    }
}

任何帮助都将不胜感激。

Android使其他类的View无效

0 个答案: