【问题标题】:Detect swipe gestures and touch events on a view检测视图上的滑动手势和触摸事件
【发布时间】:2020-01-02 23:59:45
【问题描述】:

Android Studio、Java

有没有办法在单一视图上检测触摸、触摸释放和滑动手势?我有一个按钮,我需要能够在按钮上收听所有这些内容。

我正在寻找一种解决方案,让侦听器/检测器最终调用这些方法,以便我可以轻松地使用它们:

public void buttonPressedDown() {

}

public void buttonReleased() {

}

public void swipeUp() {

}

public void swipeRight() {

}

public void swipeDown() {

}

public void swipeLeft() {

}

在开发 ios 应用程序时,这在 xcode 中很容易实现,但我似乎无法为 android 找到方法。

额外信息: 这是我尝试过的:

    timerButton.setOnTouchListener(new View.OnTouchListener() { //Detecting a press down
        @Override
        public boolean onTouch(View v, MotionEvent event) {

            timerDown();

            return false;
        }
    });

    timerButton.setOnTouchListener(new OnSwipeTouchListener(timerActivity.this) {//Detecting swipes

        public void onSwipeTop() {

            showStats();

        }

        public void onSwipeBottom() {

            showType();

        }

        public void onSwipeRight() {

            showMenu();

        }

        public void onSwipeLeft() {

            showTimes();

        }

    });


    .
    .
    .


    public void timerButtonPressed(View view) {//Detecting press releases
        timerUp();
    }

这似乎是我正在寻找的东西,但它不起作用。在同一视图上设置两个 onTouchListener 时,只调用了一个侦听器。当我测试它时,要么只有滑动检测有效,要么只有按下检测有效。

帮忙!?

编辑: 我试过这个:

OnSwipeTouchListener.java

public class OnSwipeTouchListener implements View.OnTouchListener {

    private final GestureDetector gestureDetector;

    public OnSwipeTouchListener(Context context) {
        gestureDetector = new GestureDetector(context, new GestureListener());
    }

    public void onSwipeLeft() {
    }

    public void onSwipeRight() {
    }

    public boolean onTouch(View v, MotionEvent event) {
        return gestureDetector.onTouchEvent(event);
    }

    private final class GestureListener extends GestureDetector.SimpleOnGestureListener {

        private static final int SWIPE_DISTANCE_THRESHOLD = 100;
        private static final int SWIPE_VELOCITY_THRESHOLD = 100;

        @Override
        public boolean onDown(MotionEvent e) {
            return true;
        }

        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
            float distanceX = e2.getX() - e1.getX();
            float distanceY = e2.getY() - e1.getY();
            if (Math.abs(distanceX) > Math.abs(distanceY) && Math.abs(distanceX) > SWIPE_DISTANCE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
                if (distanceX > 0)
                    onSwipeRight();
                else
                    onSwipeLeft();
                return true;
            }
            return false;
        }
    }
}

在我的活动中:

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

            OnSwipeTouchListener onSwipeTouchListener = new OnSwipeTouchListener(timerActivity.this);
            boolean result = onSwipeTouchListener.onTouch(v, event);
            // check if swipe was detected:
            if (result) return true;

            // Otherwise, detect other types of motion event
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    // touch down

                    timerDown();

                    break;
                case MotionEvent.ACTION_UP:
                    // touch released

                    timerUp();

                    break;
            }

            return false;
        }
    });

但是我如何从这里检测到滑动?此外,当我运行应用程序时,它甚至不再检测到触摸。

我也在我的活动中尝试过这个:

timerButton.setOnTouchListener(new OnSwipeTouchListener(timerActivity.this) {

        public void onSwipeLeft() {
            Log.i("LEFT", "LEFT");
        }

        public void onSwipeRight() {
            Log.i("RIGHT", "RIGHT");
        }

        @Override
        public boolean onTouch(View v, MotionEvent event) {

            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    // touch down

                    timerDown();

                    break;
                case MotionEvent.ACTION_UP:
                    // touch released

                    timerUp();

                    break;
            }

            return false;
        }
    });

现在它会检测触摸但不会检测滑动。如果我删除了上面的 @override onTouch 方法,但仍然有 onSwipe 方法,则检测到滑动。这怎么这么复杂?为什么它不能同时检测到滑动和触摸,我该如何解决?

【问题讨论】:

    标签: java android android-studio touch swipe


    【解决方案1】:

    我找到了解决办法。

    在 OnSwipeTouchListener.java 中:

    public class OnSwipeTouchListener implements View.OnTouchListener {
    
    private final GestureDetector gestureDetector;
    
    public OnSwipeTouchListener(Context context) {
        gestureDetector = new GestureDetector(context, new GestureListener());
    }
    
    public void onSwipeLeft() {
    }
    
    public void onSwipeRight() {
    }
    
    public void onSwipeBottom() {
    }
    
    public void onSwipeTop() {
    }
    
    public void onDownTouch() {
    
    }
    
    public boolean onTouch(View v, MotionEvent event) {
        return gestureDetector.onTouchEvent(event);
    }
    
    private final class GestureListener extends GestureDetector.SimpleOnGestureListener {
    
        private static final int SWIPE_DISTANCE_THRESHOLD = 100;
        private static final int SWIPE_VELOCITY_THRESHOLD = 100;
    
        @Override
        public boolean onDown(MotionEvent e) {
            onDownTouch();
            return false;
        }
    
        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
            boolean result = false;
            try {
                float diffY = e2.getY() - e1.getY();
                float diffX = e2.getX() - e1.getX();
                if (Math.abs(diffX) > Math.abs(diffY)) {
                    if (Math.abs(diffX) > SWIPE_DISTANCE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
                        if (diffX > 0) {
                            onSwipeRight();
                        } else {
                            onSwipeLeft();
                        }
                        result = true;
                    }
                }
                else if (Math.abs(diffY) > SWIPE_DISTANCE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
                    if (diffY > 0) {
                        onSwipeBottom();
                    } else {
                        onSwipeTop();
                    }
                    result = true;
                }
            } catch (Exception exception) {
                exception.printStackTrace();
            }
            return result;
        }
    }
    

    }

    在活动中:

    检测按钮释放按下:(点击时)

    public void timerButtonPressed(View view) {
    
    }
    

    要检测滑动和向下按:

    timerButton.setOnTouchListener(new OnSwipeTouchListener(timerActivity.this) {
    
            public void onSwipeLeft() {
    
            }
    
            public void onSwipeRight() {
    
            }
    
            public void onSwipeBottom() {
    
            }
    
            public void onSwipeTop() {
    
            }
    
            public void onDownTouch() {
    
            }
        });
    

    【讨论】:

    • 我试过了。 onDown 必须返回 true 才能处理投掷事件。
    【解决方案2】:

    第二次调用setOnTouchListener 会覆盖你之前的监听器。您可以通过以下方式检测触摸和手势:

    timerButton.setOnTouchListener(new View.OnTouchListener() { 
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                // deliver motion event to your swipe listener
                boolean result = mySwipeListener.onTouch(event);
                // check if swipe was detected:
                if (result) return true;
    
                // Otherwise, detect other types of motion event
                switch (event.getAction()) {
                    case MotionEvent.ACTION_DOWN:
                        // touch down
                        break;
                    case MotionEvent.ACTION_UP:
                        // touch released
                        break;
                    // etc... see this link for more motion events https://developer.android.com/reference/android/view/MotionEvent
                }
    
                return false;
            }
        });
    

    这是一个在滑动监听器上实现的示例:Android: How to handle right to left swipe gestures

    【讨论】:

    • 好主意!试过了,但它并没有真正起作用。我需要更多细节。主要是关于如何检测滑动,因为现在代码只检查是否有滑动。
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