ViewPage判断左右滑动

判断viewpage左右滑动的方法：

package com.meityitian.app.views;

[java] view
plaincopy

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;

}

}

Log.i("meityitianViewPager",

"meityitianViewPager onPageScrolled last :arg2 ,"

+ lastValue + ":" + arg2);

lastValue = arg2;

}

@Override

public void onPageSelected(int arg0) {

if(changeViewCallback!=null){

changeViewCallback.getCurrentPageIndex(arg0);

}

}

};

/**

* 得到是否向右侧滑动

* @return true 为右滑动

*/

public boolean getMoveRight(){

return right;

}

/**

* 得到是否向左侧滑动

* @return true 为左做滑动

*/

public boolean getMoveLeft(){

return left;

}

/**

* 滑动状态改变回调

* @author zxy

*

*/

public interface ChangeViewCallback{

/**

* 切换视图 ？决定于left和right 。

* @param left

* @param right

*/

public void changeView(boolean left,boolean right);

public void getCurrentPageIndex(int index);

}

/**

* set ...

* @param callback

*/

public void setChangeViewCallback(ChangeViewCallback callback){

changeViewCallback = callback;

}

}