android 自定义左右滑动监听

在 Android 中，我们可以使用 `GestureDetector` 类来监听手势事件，从而实现左右滑动的监听。下面是一个简单的示例代码：

import android.content.Context;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;

public class CustomSwipeListener implements View.OnTouchListener {

    private GestureDetector gestureDetector;

    public CustomSwipeListener(Context context) {
        gestureDetector = new GestureDetector(context, new SwipeGestureListener());
    }

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

    private class SwipeGestureListener extends GestureDetector.SimpleOnGestureListener {

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

        @Override
        public boolean onFling(MotionEvent event1, MotionEvent event2, float velocityX, float velocityY) {
            boolean result = false;
            float diffX = event2.getX() - event1.getX();
            float diffY = event2.getY() - event1.getY();

            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;
                }
            } else {
                if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
                    if (diffY > 0) {
                        onSwipeDown();
                    } else {
                        onSwipeUp();
                    }
                    result = true;
                }
            }

            return result;
        }
    }

    public void onSwipeRight() {
        // 处理向右滑动的逻辑
    }

    public void onSwipeLeft() {
        // 处理向左滑动的逻辑
    }

    public void onSwipeUp() {
        // 处理向上滑动的逻辑
    }

    public void onSwipeDown() {
        // 处理向下滑动的逻辑
    }
}

你可以将 `CustomSwipeListener` 应用到任何 `View` 上，例如一个 `LinearLayout` 或者一个 `ImageView`，然后在 `onSwipeRight()` 和 `onSwipeLeft()` 方法中处理向右滑动和向左滑动的逻辑。同样地，你可以在 `onSwipeUp()` 和 `onSwipeDown()` 方法中处理向上滑动和向下滑动的逻辑。