Android编程中ViewPage判断左右滑动方向的方法
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2021-01-20
09:10:03
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Android编程中编程中ViewPage判断左右滑动方向的方法判断左右滑动方向的方法
本文实例讲述了Android编程中ViewPage判断左右滑动方向的方法。分享给大家供大家参考，具体如下：
package com.meityitian.app.views;
import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.util.Log;
import com.meityitian.app.utils.Debug;
/**
* 重写，添加了判定滑动方向的方法
* @author zxy
*
*/
public class meityitianViewPager extends ViewPager {
private boolean left = false;
private boolean right = false;
private boolean isScrolling = false;
private int lastValue = -1;
private ChangeViewCallback changeViewCallback = null;
public meityitianViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public meityitianViewPager(Context context) {
super(context);
init();
}
/**
* init method .
*/
private void init() {
setOnPageChangeListener(listener);
}
/**
* listener ,to get move direction .
*/
public OnPageChangeListener listener = new OnPageChangeListener() {
@Override
public void onPageScrollStateChanged(int arg0) {
if (arg0 == 1) {
isScrolling = true;
} else {
isScrolling = false;
}
Debug.infoByTag("meityitianViewPager",
"meityitianViewPager onPageScrollStateChanged : arg0:"
+ arg0);
if (arg0 == 2) {
Debug.infoByTag("meityitianViewPager",
"meityitianViewPager onPageScrollStateChanged direction left ? "
+ left);
Debug.infoByTag("meityitianViewPager",
"meityitianViewPager onPageScrollStateChanged direction right ? "
+ right);
//notify ....
if(changeViewCallback!=null){
changeViewCallback.changeView(left, right);
}
right = left = false;
}
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
if (isScrolling) {
if (lastValue > arg2) {
// 递减，向右侧滑动
right = true;
left = false;
} else if (lastValue < arg2) {
// 递减，向右侧滑动
right = false;
left = true;
} else if (lastValue == arg2) {
right = left = false;
}
}
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