android开发： 我有一个LineaLayout要监听左滑和右滑给点示例代码

你可以使用GestureDetector来监听左滑和右滑事件。以下是一个示例代码：

import android.content.Context;
import android.support.annotation.Nullable;
import android.support.v4.view.GestureDetectorCompat;
import android.support.v4.view.MotionEventCompat;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.widget.LinearLayout;
import android.widget.Toast;

public class SwipeLinearLayout extends LinearLayout {

    private GestureDetectorCompat mGestureDetector;

    public SwipeLinearLayout(Context context) {
        super(context);
        init(context);
    }

    public SwipeLinearLayout(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    public SwipeLinearLayout(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context);
    }

    private void init(Context context) {
        mGestureDetector = new GestureDetectorCompat(context, new MyGestureListener());
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        mGestureDetector.onTouchEvent(event);
        return super.onTouchEvent(event);
    }

    private class MyGestureListener extends GestureDetector.SimpleOnGestureListener {

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

        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
            float diffX = e2.getX() - e1.getX();
            float diffY = e2.getY() - e1.getY();

            // 判断滑动的方向
            if (Math.abs(diffX) > Math.abs(diffY)) {
                if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
                    if (diffX > 0) {
                        // 右滑
                        Toast.makeText(getContext(), "右滑", Toast.LENGTH_SHORT).show();
                    } else {
                        // 左滑
                        Toast.makeText(getContext(), "左滑", Toast.LENGTH_SHORT).show();
                    }
                    return true;
                }
            }

            return false;
        }
    }
}

你可以将以上代码保存成一个名为SwipeLinearLayout的类，并在布局文件中使用该自定义布局。当你在该布局上进行左滑或右滑动作时，会显示相应的Toast提示信息