android - onTouch 同时向上滑动和向下滑动

Question

我正在尝试用我的观点做 3 件事。第一次“点击”我的屏幕时，我想将 View 顶部的 ImageView 完全设置为 0alpha 以显示下方 View 。当屏幕水龙头被抬起时，我希望 alpha 回到 1alpha 隐藏图像。接下来，当手指向下并显示图像时，我喜欢在屏幕上上下滑动以更改顶层的 alpha，以便通过它显示下面的图像。我的问题是我无法同时解析 swipeUp、swipeDown 和 touch，它要么只是 swipeUp 和 swipeDown，要么只是触摸!有人可以帮我解决这个问题吗？

        blackPart.setOnTouchListener(new OnSwipeTouchListener(this) {

            @Override
            public void onSwipeDown() {
                Log.d("OK", "bye");
                if(drawAlpha > 0.25)
                {
                    drawAlpha -= 0.25;

                };
                blackPart.setAlpha(drawAlpha);
                Log.d("notes", "alpha:" + drawAlpha);

            }
            @Override
            public void onSwipeUp() {
                if(drawAlpha < 1.0)
                {
                    drawAlpha += 0.25;
                }
                blackPart.setAlpha(drawAlpha);

            }


            @Override
            public boolean onTouch(View arg0, MotionEvent arg1)
            {

                Log.d("notes", "touched");
                if(SP.getBoolean("drawingAlwaysVisible", false)) return true;

                    if(arg1.getAction() == MotionEvent.ACTION_UP) {
                    Log.d("OK", "action up");
                    arg0.setAlpha(1.0f);
                }
                else if(arg1.getAction() == MotionEvent.ACTION_DOWN)
                {
                    arg0.setAlpha(0.0f);
                    Log.d("OK", "no");
                }

                return true;
            }


        });

Answer 1

这是部分代码，应该可以工作

imageView.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {

            float eventX = event.getX();
            float eventY = event.getY();

            switch (event.getAction()) {

                case MotionEvent.ACTION_DOWN:

                    return true;

                case MotionEvent.ACTION_MOVE:

                    int historySize = event.getHistorySize();
                    for (int i = 0; i < historySize; i++) {
                        float historicalX = event.getHistoricalX(i);
                        float historicalY = event.getHistoricalY(i);

                        if (historicalY >= eventY) {
                            //move is down
                        } else {
                            //move is up
                        }
                        if (historicalX >= eventX) {
                            //move is right
                        } else {
                            //move is left
                        }
                        eventX = historicalX;
                        eventY = historicalY;

                        Log.d(TAG, "onTouch: X = " + eventX);
                        Log.d(TAG, "onTouch: Y = " + eventY);
                    }

                    return true;
            }
            return false;
        }
    });