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 space\MyApplication\app\src\main\res\drawable\bg_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 space\MyApplication\app\src\main\res\drawable\bg_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 space\MyApplication\app\src\main\res\drawable\ic_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 space\MyApplication\app\src\main\res\drawable\selector.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; } }}