Handler和ViewPager无限轮播

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package com.bw.uigaoji.fragment;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;

import com.bw.uigaoji.R;
import com.bw.uigaoji.adapter.ViewPagerAdapter;
import com.google.gson.Gson;

import java.util.List;
import java.util.Timer;
import java.util.TimerTask;

public class F1 extends Fragment {

private View view;
private ViewPager mVp;
private ListView mList;
//代表那个图片图片
int i=0;
//数据源
int[] ints={R.drawable.j1,R.drawable.j2,R.drawable.j3,R.drawable.j4,R.drawable.j5,R.drawable.j6};
//切换图片
Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
//设置vp显示视图位置
mVp.setCurrentItem(i);
i++;
}
};
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

View view = inflater.inflate(R.layout.f1_item, container, false);
initView(view);
mVp.setOffscreenPageLimit(4);
Timer timer=new Timer();
//让定时器执行任务, 每一秒发一次信息;
timer.schedule(new TimerTask() {
@Override
public void run() {
handler.sendEmptyMessage(0);
}
},0,1000);
ViewPagerAdapter viewPagerAdapter=new ViewPagerAdapter(getActivity(),ints);
mVp.setAdapter(viewPagerAdapter);

Gson gson=new Gson();

return view;
}

private void initView(View view) {
mVp = (ViewPager) view.findViewById(R.id.vp);
mList = (ListView) view.findViewById(R.id.list);
}
}
适配器

package com.bw.uigaoji.adapter;

import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.view.View;
4000
import android.view.ViewGroup;
import android.widget.ImageView;
//继承PagerAdapter会重写两个方法 但是还要自己手动重写两个方法分别是instantiateItem和destroyItem
public class ViewPagerAdapter extends PagerAdapter {
Context context;
int[] ints;

public ViewPagerAdapter(Context context, int[] ints) {
this.context = context;
this.ints = ints;
}

@Override
public int getCount() {
//最大值
return Integer.MAX_VALUE;
}

@Override
public boolean isViewFromObject(View view, Object object) {
//相等于
return view==object;
}
//重写第一个的方法
@Override
public Object instantiateItem(ViewGroup container, int position) {
ImageView imageView=new ImageView(context);
//下标为几的图抹除于数组长度
imageView.setImageResource(ints[position%ints.length]);
//拉伸图片
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
//添加
container.addView(imageView);
return imageView;

}
//重写的第二个方法
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
//注释掉就可以了
//super.destroyItem(container, position, object);
//remove强转
container.removeView((View) object);
}
}