无限轮播

1.布局

<?xml version="1.0" encoding="utf-8"?><RelativeLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"    android:layout_height="match_parent" tools:context="com.example.wxlb.MainActivity"><android.support.v4.view.ViewPager    android:layout_width="386dp"    android:layout_height="300dp"    android:id="@+id/vp"    ></android.support.v4.view.ViewPager>    <LinearLayout    android:orientation="horizontal"    android:id="@+id/li"    android:layout_width="match_parent"    android:layout_height="20dp"></LinearLayout></RelativeLayout>

2.drawable里放入图片

3.Activity

package com.example.wxlb;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import android.widget.LinearLayout;public class MainActivity extends AppCompatActivity {int  index;    private LinearLayout li;    private ViewPager vp;    int ids[]=new int[]{R.drawable.r,R.drawable.tt,R.drawable.w,R.drawable.x};     Handler handler=new Handler(){    @Override    public void handleMessage(Message msg) {        super.handleMessage(msg);    index++;    while (index>=5){        index=0;    }    vp.setCurrentItem(index);     handler.sendEmptyMessageDelayed(0,200);    }};    private MyBase myBase;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        vp = (ViewPager) findViewById(R.id.vp);        li = (LinearLayout) findViewById(R.id.li);        myBase = new MyBase();        vp.setAdapter(myBase);        inticot();         vp.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {            @Override            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {            }            @Override            public void onPageSelected(int position) {for (int i=0;i<li.getChildCount();i++){    ImageView img =(ImageView) li.getChildAt(i);    if (i==position%ids.length)    {        img.setImageResource(R.drawable.point_selected);    }else {        img.setImageResource(R.drawable.point_mormal);    }}            }            @Override            public void onPageScrollStateChanged(int state) {            }        });handler.sendEmptyMessageDelayed(0,2000);    }    private void inticot() {        for (int i=0;i<ids.length;i++)        {            ImageView imageView = new ImageView(MainActivity.this);            if (i==0){                imageView.setImageResource(R.drawable.point_selected);            }            else {                imageView.setImageResource(R.drawable.point_mormal);            }            LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(10, 10);            layoutParams.setMargins(10,5,10,5);            li.addView(imageView,layoutParams);        }    }    class MyBase extends PagerAdapter{        @Override        public int getCount() {            return ids.length;        }        @Override        public boolean isViewFromObject(View view, Object object) {            return view==object;        }        @Override        public Object instantiateItem(ViewGroup container, int position) {            ImageView imageView = new ImageView(MainActivity.this);            imageView.setImageResource(ids[position]);            container.addView(imageView);            return imageView;        }        @Override        public void destroyItem(ViewGroup container, int position, Object object) {            container.removeView((View)object);        }    }}

4.一定在清单文件中加入联网操作