參考Android中的雙擊事件使用如下代碼對TextView進行雙擊監聽，發現怎么也觸發不了雙擊事件。

GestureDetector gestureDetector;
gestureDetector = new GestureDetector(mContext, new GestureDetector.SimpleOnGestureListener() {
    @Override
    public boolean onDoubleTap(MotionEvent e) {
        Toast.makeText(mContext, "這是雙擊事件", Toast.LENGTH_SHORT).show();
        return super.onDoubleTap(e);
    }

    @Override
    public boolean onSingleTapConfirmed(MotionEvent e) {
        Toast.makeText(mContext, "單擊擊事件 onSingleTapConfirmed", Toast.LENGTH_SHORT).show();
        return super.onSingleTapConfirmed(e);
    }

});
tv.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        return gestureDetector.onTouchEvent(event);
    }
});  

查閱資料之后發現，需要進行如下修改：

GestureDetector gestureDetector;
gestureDetector = new GestureDetector(mContext, new GestureDetector.SimpleOnGestureListener() {
    @Override
    public boolean onDoubleTap(MotionEvent e) {
        Toast.makeText(mContext, "這是雙擊事件", Toast.LENGTH_SHORT).show();
        return super.onDoubleTap(e);
    }

    @Override
    public boolean onSingleTapConfirmed(MotionEvent e) {
        Toast.makeText(mContext, "單擊擊事件 onSingleTapConfirmed", Toast.LENGTH_SHORT).show();
        return super.onSingleTapConfirmed(e);
    }

    @Override
    public boolean onDown(MotionEvent e) {
        return true;
    }
});
tv.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        return gestureDetector.onTouchEvent(event);
    }
});  

需重寫GestureDetector.SimpleOnGestureListener()中的onDown()返回true

原因：

https://developer.android.com/training/gestures/detector.html 中的描述：

Whether or not you use GestureDetector.OnGestureListener, it's best practice to implement an onDown() method that returns true. This is because all gestures begin with an onDown() message. If you return false from onDown(), as GestureDetector.SimpleOnGestureListener does by default, the system assumes that you want to ignore the rest of the gesture, and the other methods of GestureDetector.OnGestureListener never get called. This has the potential to cause unexpected problems in your app. The only time you should return false from onDown() is if you truly want to ignore an entire gesture.

onDown()是所有方法的開始，只有onDown()返回true，后續的手勢監聽才會被觸發