Swipt探测器手势android-Java 学习之路

@Override
public boolean onTouchEvent(MotionEvent event) {
    if (gestureDetector.onTouchEvent(event)) {
        return true;
    }
    return super.onTouchEvent(event);
}
private void onLeftSwipe() {
// Do something
    System.out.println("left swipe");
}

private void onRightSwipe() {
// Do something
    System.out.println("right swipe");
}

// Private class for gestures
private class SwipeGestureDetector extends SimpleOnGestureListener {
    // Swipe properties, you can change it to make the swipe
    // longer or shorter and speed
    private static final int SWIPE_MIN_DISTANCE = 120;
    private static final int SWIPE_MAX_OFF_PATH = 200;
    private static final int SWIPE_THRESHOLD_VELOCITY = 200;

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        try {
            float diffAbs = Math.abs(e1.getY() - e2.getY());
            float diff = e1.getX() - e2.getX();

            if (diffAbs > SWIPE_MAX_OFF_PATH)
            return false;

            // Left swipe
            if (diff > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                SlidingMenuActivity.this.onLeftSwipe();

                // Right swipe
            } else if (-diff > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                SlidingMenuActivity.this.onRightSwipe();
            }
        } catch (Exception e) {
            Log.e("YourActivity", "Error on gestures");
        }
        return false;
    }
}

我有，但它没有工作，我无法检测向左或向右滑动 . 我已经在我的 class 和 onCreate 活动方法中声明了 private GestureDetector gestureDetector; .

gestureDetector = new GestureDetector(new SwipeGestureDetector());

但它不起作用，没有印刷？我正在使用kitkat nexus 4 .

2 回答

0
您必须将侦听器应用于您希望处理的视图，例如：
```
myView.setOnTouchListener(new SwipeGestureDetector(this)....
```
回复于 2024-05-03T16:15:28+08:00

尝试更新代码

public class OnSwipeTouchListener implements OnTouchListener {
private final GestureDetector gestureDetector;
int SWIPE_THRESHOLD = 200;
int SWIPE_VELOCITY_THRESHOLD = 200;

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

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

private final class CustomGestureListenerClass extends SimpleOnGestureListener {


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

    @Override
    public boolean onSingleTapUp(MotionEvent e) {
        singleClicked(e);
        return super.onSingleTapUp(e);
    }

    @Override
    public boolean onScroll(MotionEvent startMotionEvent, MotionEvent endMotionEvent, float distanceX, float distanceY) {
        return super.onScroll(startMotionEvent, endMotionEvent, distanceX, distanceY);
    }


    @Override
    public boolean onFling(MotionEvent startMotionEvent, MotionEvent endMotionEvent, float velocityX, float velocityY) {

        boolean result = false;
        try {
            float diffY = endMotionEvent.getY() - startMotionEvent.getY();
            float diffX = endMotionEvent.getX() - startMotionEvent.getX();
            if (Math.abs(diffX) > Math.abs(diffY)) {
                if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
                    if (diffX > 0) {
                        onSwipeRight();
                    } else {
                        onSwipeLeft();
                    }
                }
                result = true;
            }
            result = true;
        } catch (Exception exception) {
            exception.printStackTrace();
        }
        return result;
    }
}

public void onSwipeRight() {
    // if you want done some portion before call this method then write here
}

public void onSwipeLeft() {
    // if you want done some portion before call this method then write here
}

public void singleClicked(MotionEvent e) {
}
}

回复于 2024-05-03T16:15:28+08:00

Swipt探测器手势android

2 回答

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