Android MotionEvent.ACTION_MOVE防止系统覆盖按钮的点击行为

Question

我有一个ImageView，它正在用作系统覆盖按钮，但问题出在移动按钮和单击按钮之间。我将在下面为onTouchListener发布代码，但实际上发生的是每次用户尝试单击IV时，除非他们设法达到图像的完美中心，否则ACTION_MOVE会覆盖ACTION_UP的代码。当用户只是点击按钮时，我正在尝试截屏，这就是为什么它仅触发ACTION_DOWN的原因。我尝试过的所有操作都不起作用，或者最终导致IV每次按时在屏幕上缓慢爬行。任何帮助都将不胜感激，即使它只是到另一个SO或教程的链接，因为我的整个应用程序几乎都取决于这种行为。

chatHeadImage.setOnTouchListener(new View.OnTouchListener() {
            private int lastAction;
            private int initialX;
            private int initialY;
            private float initialTouchX;
            private float initialTouchY;

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch(event.getAction()){
                    case MotionEvent.ACTION_DOWN:
                        //remember the initial position
                        initialX = params.x;
                        initialY = params.y;

                        //get the touch location
                        initialTouchX = event.getRawX();
                        initialTouchY = event.getRawY();

                        lastAction = event.getAction();
                        return true;

                    case MotionEvent.ACTION_UP:
                        //As we implemented on touch listener with ACTION_MOVE,
                        //we have to check if the previous action was ACTION_DOWN
                        //to identify if the user clicked the view or not
                        if(lastAction == MotionEvent.ACTION_DOWN){
                            Toast.makeText(ChatHeadService.this,
                                    "Overlay pressed",
                                    Toast.LENGTH_SHORT).show();
                        }
                        lastAction = event.getAction();
                        return true;

                    case MotionEvent.ACTION_MOVE:
                        //Calculate the X and Y coordinates of the view
                        params.x = initialX + (int)(event.getRawX() - initialTouchX);
                        params.y = initialY + (int)(event.getRawY() - initialTouchY);

                        //Update the layout with new X & Y coordinate
                        mWindowManager.updateViewLayout(mChatHeadView, params);
                        lastAction = event.getAction();
                        return true;
                }

                return false;
            }
        });