如何在Android的activity?.runOnUiThread中停止/取消任务？

private boolean isTaskCancelled = false;

public void stopTask() {
    isTaskCancelled = true;
}

public void runTaskOnUiThread() {
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            // 执行任务
            while (!isTaskCancelled) {
                // 任务逻辑
            }
        }
    });
}

private Handler handler = new Handler();

public void stopTask() {
    handler.removeCallbacksAndMessages(null);
}

public void runTaskOnUiThread() {
    handler.post(new Runnable() {
        @Override
        public void run() {
            // 执行任务
            while (!Thread.currentThread().isInterrupted()) {
                // 任务逻辑
            }
        }
    });
}