Android 自定义View 实现手势监听，左右滑动，上下滑动

package com.example.administrator.myapplication;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.widget.RelativeLayout;
import android.widget.Toast;

/**
* Created by Administrator on 2016-09-13.
*/
public class MyLayout extends RelativeLayout implements GestureDetector.OnGestureListener {
private
    int verticalMinDistance = 20;

private
    int minVelocity = 0;

private MyLayoutCallBack myLayoutCallBack;
private GestureDetector gestureDetector;
Context context;

public void setCallBack(MyLayoutCallBack myLayoutCallBack) {
this.myLayoutCallBack = myLayoutCallBack;
}

public MyLayout(Context context) {
super(context);
gestureDetector = new GestureDetector(context, this);
this.context = context;
}

public MyLayout(Context context, AttributeSet attrs) {
super(context, attrs);
gestureDetector = new GestureDetector(context, this);
}

@Override
public boolean onTouchEvent(MotionEvent event) {
this.gestureDetector.onTouchEvent(event);
return true;
}

@Override
public boolean onDown(MotionEvent e) {
Log.d("pingan", "onDown");
return true;
}

@Override
public void onShowPress(MotionEvent e) {

}

@Override
public boolean onSingleTap
92d1
Up(MotionEvent e) {
return false;
}

@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
Log.d("pingan", "onScroll" + distanceX + "distanceY:" + distanceY);

if (distanceX < -verticalMinDistance) {
Log.d("pingan", "向右手势");
myLayoutCallBack.scrollByX(20);

} else if (distanceX > verticalMinDistance){

Log.d("pingan", "向左手势");
myLayoutCallBack.scrollByX(-20);

}else if (distanceY <- verticalMinDistance) {
Log.d("pingan", "向下手势");
myLayoutCallBack.scrollByY(20);

} else if (distanceY > verticalMinDistance ) {

Log.d("pingan", "向上手势");
myLayoutCallBack.scrollByY(-20);

}
return true;
}

@Override
public void onLongPress(MotionEvent e) {

}

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
Log.d("pingan", "onFling");

if (e1.getX()
- e2.getX() > verticalMinDistance && Math.abs(velocityX) > minVelocity) {
Log.d("pingan", "向左手势");
myLayoutCallBack.scrollByX(-20);

} else if ((e2.getX() - e1.getX() > verticalMinDistance && Math.abs(velocityX) > minVelocity)) {

Log.d("pingan", "向右手势");
myLayoutCallBack.scrollByX(20);

} else if (e1.getY()
- e2.getY() > verticalMinDistance && Math.abs(velocityY) > minVelocity) {
Log.d("pingan", "向上手势");
myLayoutCallBack.scrollByY(-20);

} else if ((e2.getY() - e1.getY() > verticalMinDistance && Math.abs(velocityY) > minVelocity)) {

Log.d("pingan", "向下手势");
myLayoutCallBack.scrollByY(20);

}

return true;
}
}