如何实现viewpager自动轮播

//主界面

package com.example.viewpager;

import java.util.ArrayList;

import java.util.List;

import com.example.adapter.MyPagerAdapter;

import android.R.integer;

import android.app.Activity;

import android.os.Bundle;

import android.os.Handler;

import android.support.v4.view.ViewPager;

import android.support.v4.view.ViewPager.LayoutParams;

import android.support.v4.view.ViewPager.OnPageChangeListener;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.ImageView;

import android.widget.LinearLayout;

/**

* 使用viewpager实现滑动，当滑动页面时，页面下的小圆点跟随页面的滑动而改变

* @author 浅议爱

*

*/

public class MainActivity extends Activity {

private ViewPager mViewPager;

private LinearLayout lin;

private List<View> views;

//定义适配器

private MyPagerAdapter adapter;

//上一个知识点

private int lastPointIndex=0;

//使用handler完成操作

Handler handler=new Handler(){

public void handleMessage(android.os.Message msg) {

//获取viewpager滑动的当前位置

int currentItem=mViewPager.getCurrentItem();

mViewPager.setCurrentItem(currentItem+=1);

//持续两秒，

handler.sendEmptyMessageAtTime(1, 2000);

};

};

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

//获取控件id

mViewPager=(ViewPager) findViewById(R.id.myviewpager);

lin=(LinearLayout) findViewById(R.id.aaaa);

//获取控件id

//定义方法，加载数据

intodata();

adapter=new MyPagerAdapter(getApplicationContext(),views);

mViewPager.setAdapter(adapter);

int item=Integer.MAX_VALUE/2-Integer.MAX_VALUE/2%views.size();

mViewPager.setCurrentItem(item);

handler.sendEmptyMessageAtTime(1, 2000);

//设置viewapgee滑动监听

mViewPager.setOnPageChangeListener(new OnPageChangeListener() {

//viewpager当前展示的页面

@Override

public void onPageSelected(int arg0) {

// TODO Auto-generated method stub

int myindex=arg0%views.size();

//改变指示点的状态，将当前图片的enable设为true

lin.getChildAt(myindex).setEnabled(true);

//将上一个指示点的enable设为false

lin.getChildAt(lastPointIndex).setEnabled(false);

//更新lastPointIndex的值

lastPointIndex=myindex;

}

//当viwpager页面滑动时，

@Override

public void onPageScrolled(int arg0, float arg1, int arg2) {

// TODO Auto-generated method stub

}

//当停止滑动时

@Override

public void onPageScrollStateChanged(int arg0) {

// TODO Auto-generated method stub

}

});

}

/**

* 加载viewpager页面数据

*/

private void intodata() {

// TODO Auto-generated method stub

views=new ArrayList<View>();

views.add(View.inflate(getApplicationContext(), R.layout.viewpager01, null));

views.add(View.inflate(getApplicationContext(), R.layout.viewpager02, null));

views.add(View.inflate(getApplicationContext(), R.layout.viewpager03, null));

views.add(View.inflate(getApplicationContext(), R.layout.viewpager04, null));

for (int i = 0; i < views.size(); i++) {

ImageView point=new ImageView(this);

LinearLayout.LayoutParams params=new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, -2);

params.leftMargin=15;

point.setLayoutParams(params);

//设置小黑点的背景

point.setBackgroundResource(R.drawable.point_bg);

//添加到布局文件上

lin.addView(point);

if (i==0) {

point.setEnabled(true);

}else{

point.setEnabled(false);

}

}

}

}

//适配器

package com.example.adapter;

import java.util.List;

import android.content.Context;

import android.support.v4.view.PagerAdapter;

import android.view.View;

import android.view.ViewGroup;

public class MyPagerAdapter extends PagerAdapter {

Context applicationContext;

List<View> views;

public MyPagerAdapter(Context applicationContext, List<View> views) {

super();

this.applicationContext = applicationContext;

this.views = views;

}

@Override

public int getCount() {

// TODO Auto-generated method stub

//设为最大值

return Integer.MAX_VALUE;

}

@Override

public Object instantiateItem(ViewGroup container, int position) {

// TODO Auto-generated method stub

View view=views.get(position%views.size());

container.addView(view);

return view;

}

@Override

public void destroyItem(ViewGroup container, int position, Object object) {

// TODO Auto-generated method stub

container.removeView((View) object);

// super.destroyItem(container, position, object);

}

@Override

public boolean isViewFromObject(View arg0, Object arg1) {

// TODO Auto-generated method stub

return arg0==arg1;

}

}