ViewPager实现与小圆点联动，并且实现自动轮播

1.activity_main.xml

<?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.administrator.myapplication.MainActivity">
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="180dp">
        <android.support.v4.view.ViewPager
            android:id="@+id/vp"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
        </android.support.v4.view.ViewPager>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_alignParentBottom="true"
            android:orientation="horizontal"
            android:background="#66000000"
            android:layout_height="30dp">
            <LinearLayout
                android:id="@+id/point_container"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:layout_gravity="center"
                android:gravity="center"
                >
            </LinearLayout>
        </LinearLayout>
    </RelativeLayout>
</RelativeLayout>

2.E:studio spaceMyApplicationappsrcmain esdrawableg_shape.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <corners android:radius="5dp"/>
    <solid android:color="#FFFFFF"/>
</shape>
3.E:studio spaceMyApplicationappsrcmain
esdrawableg_shape2.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <corners android:radius="5dp"/>
    <solid android:color="#808080"/>
</shape>
4.E:studio spaceMyApplicationappsrcmain
esdrawableic_launcher_background.xml

<?xml version="1.0" encoding="utf-8"?>
<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="108dp"
    android:height="108dp"
    android:viewportHeight="108"
    android:viewportWidth="108">
    <path
        android:fillColor="#26A69A"
        android:pathData="M0,0h108v108h-108z" />
    <path
        android:fillColor="#00000000"
        android:pathData="M9,0L9,108"
        android:strokeColor="#33FFFFFF"
        android:strokeWidth="0.8" />
    <path
        android:fillColor="#00000000"
        android:pathData="M19,0L19,108"
        android:strokeColor="#33FFFFFF"
        android:strokeWidth="0.8" />
    <path
        android:fillColor="#00000000"
        android:pathData="M29,0L29,108"
        android:strokeColor="#33FFFFFF"
        android:strokeWidth="0.8" />
    <path
        android:fillColor="#00000000"
        android:pathData="M39,0L39,108"
        android:strokeColor="#33FFFFFF"
        android:strokeWidth="0.8" />
    <path
        android:fillColor="#00000000"
        android:pathData="M49,0L49,108"
        android:strokeColor="#33FFFFFF"
        android:strokeWidth="0.8" />
    <path
        android:fillColor="#00000000"
        android:pathData="M59,0L59,108"
        android:strokeColor="#33FFFFFF"
        android:strokeWidth="0.8" />
    <path
        android:fillColor="#00000000"
        android:pathData="M69,0L69,108"
        android:strokeColor="#33FFFFFF"
        android:strokeWidth="0.8" />
    <path
        android:fillColor="#00000000"
        android:pathData="M79,0L79,108"
        android:strokeColor="#33FFFFFF"
        android:strokeWidth="0.8" />
    <path
        android:fillColor="#00000000"
        android:pathData="M89,0L89,108"
        android:strokeColor="#33FFFFFF"
        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M99,0L99,108"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M0,9L108,9"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M0,19L108,19"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M0,29L108,29"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M0,39L108,39"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M0,49L108,49"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M0,59L108,59"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M0,69L108,69"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M0,79L108,79"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M0,89L108,89"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M0,99L108,99"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M19,29L89,29"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M19,39L89,39"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M19,49L89,49"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M19,59L89,59"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M19,69L89,69"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M19,79L89,79"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M29,19L29,89"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M39,19L39,89"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M49,19L49,89"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M59,19L59,89"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M69,19L69,89"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" />    <path        android:fillColor="#00000000"        android:pathData="M79,19L79,89"        android:strokeColor="#33FFFFFF"        android:strokeWidth="0.8" /></vector>
5.E:studio spaceMyApplicationappsrcmain
esdrawableselector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
        <item android:state_enabled="true" android:drawable="@drawable/bg_shape"/>
        <item android:state_enabled="false"  android:drawable="@drawable/bg_shape2"/>
</selector>
6.MainActivity.class

package com.example.administrator.myapplication;

import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity implements ViewPager.OnPageChangeListener {
    private ViewPager vp;
    private int[] imas;
    private LinearLayout ll;
    private ArrayList<ImageView> imaList;
    private Boolean flag;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //初始化布局
        initViews();
        //数据
        initData();

        //适配器
        initAdapter();
        flag = true;
        //实现自动轮播
        new Thread(new Runnable() {
            @Override
            public void run() {

                while (flag) {
                    try {
                        Thread.sleep(2000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            vp.setCurrentItem(vp.getCurrentItem() + 1);
                        }
                    });
                }
            }
        }).start();
    }

    private void initAdapter() {
        ll.getChildAt(0).setEnabled(true);
        vp.setAdapter(new MyAdapter());
        vp.setCurrentItem(Integer.MAX_VALUE / 2 + 2);//这里以一个%5为0的数开始，这样打开默认会在第0个item显示
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        flag = false;
    }

    private void initData() {
    }

    private void initViews() {
        vp = (ViewPager) findViewById(R.id.vp);
        vp.setOnPageChangeListener(this);
        ll = (LinearLayout) findViewById(R.id.point_container);
        //图片数组
        imas = new int[]{R.mipmap.card1, R.mipmap.card2, R.mipmap.card3, R.mipmap.card4, R.mipmap.card5};
        ImageView iv;
        imaList = new ArrayList<ImageView>();
        View pointview;
        for (int i = 0; i < imas.length; i++) {
            iv = new ImageView(this);
            iv.setImageResource(imas[i]);
            imaList.add(iv);

            //加小白点
            pointview = new View(this);
            pointview.setEnabled(false);            pointview.setBackgroundResource(R.drawable.selector);            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(15, 15);            //params.gravity= Gravity.CENTER;            if (i != 0)                params.leftMargin = 10;            ll.addView(pointview,                    params);        }    }    @Override    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {    }    @Override    public void onPageSelected(int position) {        for (int i = 0; i < ll.getChildCount(); i++) {            ll.getChildAt(i).setEnabled(false);        }        ll.getChildAt(position % 5).setEnabled(true);//设置小白点    }    @Override    public void onPageScrollStateChanged(int state) {    }    class MyAdapter extends PagerAdapter {        @Override        public Object instantiateItem(ViewGroup container, int position) {            int newposition = position % 5;//得到新位置            ImageView imageView = imaList.get(newposition);            container.addView(imageView);            return imageView;//把View对象返回给框架，必须重写        }        @Override        public void destroyItem(ViewGroup container, int position, Object object) {            container.removeView((View) object);        }        @Override        public int getCount() {            return Integer.MAX_VALUE;        }        @Override //判断复用        public boolean isViewFromObject(View view, Object object) {            return view == object;        }    }}