android - android-从不调用MotionEvent.ACTION_UP

我想在用户将手放在视图上并放开时停止它的同时做一些工作。我的代码如下：

viewHolder.plus.setOnTouchListener(new View.OnTouchListener() {
        private Handler mHandler;
        @Override
        public boolean onTouch(View view, MotionEvent event) {
            switch(event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    if(mHandler==null)
                        mHandler = new Handler();
                    mHandler.postDelayed(mAction, 500);
                    return true;
                case MotionEvent.ACTION_UP:
                    Log.v("this","cancel");
                    if (mHandler != null) {
                        mHandler.removeCallbacks(mAction);
                        mHandler = null;
                        Log.v("this", "c cancel");
                    }
                    break;
            }
            return false;
        }

        Runnable mAction = new Runnable() {
            @Override public void run() {
                ChangeTedad(item.getid(), "plus");
                Log.v("this","Cc");
                mHandler.postDelayed(this, 500);
            }
        };

    });

问题是，从不调用ACTION_UP，并且可运行的指针将永远运行。

用户取消触摸时如何停止可运行文件？

最佳答案

您没有在触摸事件中正确设置中断和返回标志。

请替换为您的代码，

viewHolder.plus.setOnTouchListener(new View.OnTouchListener() {
        private Handler mHandler;
        @Override
        public boolean onTouch(View view, MotionEvent event) {
            switch(event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    if(mHandler==null)
                        mHandler = new Handler();
                    mHandler.postDelayed(mAction, 500);
                    break;
                case MotionEvent.ACTION_UP:
                    Log.v("this","cancel");
                    if (mHandler != null) {
                        mHandler.removeCallbacks(mAction);
                        mHandler = null;
                        Log.v("this", "c cancel");
                    }
                    break;
            }
            return true;
        }

        Runnable mAction = new Runnable() {
            @Override public void run() {
                ChangeTedad(item.getid(), "plus");
                Log.v("this","Cc");
                mHandler.postDelayed(this, 500);
            }
        };
    });

希望对你有帮助