public class MainActivity extends AppCompatActivity {

 private LinearLayout ll_dots;
 private TextView viewpager_tv;

 // 將ViewPager定義為全局變量,方便使用.
 private ViewPager viewpager_vp;

 // 建立一個(gè)ArrayList集合.泛型指定為ImageView.
 ArrayList<ImageView> imageViews = new ArrayList<ImageView>();



 //創(chuàng)建一個(gè)handler對(duì)象,復(fù)寫handlerMessage方法,用switch方法,通過(guò)msg.what得到標(biāo)識(shí).333
 private Handler handler = new Handler() {
  @Override
  public void handleMessage(Message msg) {
   switch (msg.what) {
    case 1:
     //得到當(dāng)前VIewPager和用戶交互的item條目.VIewPager對(duì)象.getCurrentItem 333
     int currentItem = viewpager_vp.getCurrentItem();
     //設(shè)置ViewPager當(dāng)前顯示的界面,得到的ITem+1
     viewpager_vp.setCurrentItem(currentItem + 1);
     //通過(guò)靜態(tài)方法sendEmptyMessageDelayed,延時(shí)重復(fù)執(zhí)行命令.注意不是sendEmptyMessageAtTime 333
     sendEmptyMessageDelayed(1, 3000);
     break;
    default:
     break;
   }

  }
 };

 //圖片int數(shù)組資源
 private int[] imageResIds = {R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d, R.drawable.e, R.drawable.f};

 //圖片字符串?dāng)?shù)組String[]資源.
 private String[] descs = {
   "網(wǎng)頁(yè)設(shè)計(jì)師聯(lián)盟",
   "教程網(wǎng)",
   "PS聯(lián)盟",
   "25學(xué)堂",
   "課工場(chǎng)帶你逆襲,助你走向人生巔峰",
   "當(dāng)你因需求被項(xiàng)目經(jīng)理頻繁修改,而想之暴打時(shí),請(qǐng)先看易老師賤笑圖,你是不是更想打我了"
 };

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  //對(duì)控件進(jìn)行初始化
  init();
 }

 /**
  * 對(duì)VIewPager進(jìn)行初始化.
  */
 private void init() {
  //找到可以設(shè)置點(diǎn)的容器LinearLayout的對(duì)象,進(jìn)行點(diǎn)的添加
  ll_dots = (LinearLayout) findViewById(R.id.ll_dots);
  //找到文本的對(duì)象.
  viewpager_tv = (TextView) findViewById(R.id.viewpager_tv);
  //找到VIewPager對(duì)象.
  viewpager_vp = (ViewPager) findViewById(R.id.viewpager_vp);

  //更加圖片int數(shù)組資源的數(shù)量,動(dòng)態(tài)的創(chuàng)建ImageView控件.就是有幾張圖片,創(chuàng)建幾個(gè)ImageView,for循環(huán)
  for (int x = 0; x < imageResIds.length; x++) {
   //創(chuàng)建ImageView對(duì)象
   ImageView imageView = new ImageView(this);
   //通過(guò)該對(duì)象添加圖片資源.setBackgroundResource方法.
   imageView.setBackgroundResource(imageResIds[x]);
   //把控件添加到集合ImageViews中去,以方便在VIewPager的適配器里instantiateItem方法獲取.
   imageViews.add(imageView);
   //進(jìn)行點(diǎn)的添加,其個(gè)數(shù)和圖片的個(gè)數(shù)一致,因此放到該循環(huán)中.222
   dot();
  }

  //設(shè)置適配器.setAdapter
  viewpager_vp.setAdapter(new Myadapter());
  //設(shè)置ViewPager的滑動(dòng)監(jiān)聽(tīng)器,addOnPageChangeListener,set的方法因?yàn)槊值脑虮惶蕴?在onPageScrolled中.222
  viewpager_vp.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {


   @Override
   public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
    //同過(guò)getCurrentItem方法拿到當(dāng)前用戶所交互ViewPager的item位置.
    int currentItem = viewpager_vp.getCurrentItem();
    //通過(guò)得到的這個(gè)item,給text和點(diǎn)進(jìn)行選中的設(shè)置.
    changeTextAndDot(currentItem % imageResIds.length);
    Log.d("aaa", "onPageScrolled: Position-" + position + " positionOffset-" + positionOffset + " positionOffsetPixels-" + positionOffsetPixels);

   }

   @Override
   public void onPageSelected(int position) {
    Log.d("aaa", "onPageSelected: position" + position);
   }

   @Override
   public void onPageScrollStateChanged(int state) {
    Log.d("aaa", "onPageScrollStateChanged: state" + state);
   }
  });
  //指定VIewPager默認(rèn)跳轉(zhuǎn)到某頁(yè).一般是最大數(shù)的一般.setCurrentItem就是設(shè)置VIewPager跳到哪頁(yè),get是獲取.333
  viewpager_vp.setCurrentItem(Integer.MAX_VALUE / 2 - 3);

  //通過(guò)handler,3秒后開(kāi)始循環(huán)ViwePager的item.sendEmptyMessageDelayed,333
  handler.sendEmptyMessageDelayed(1, 3000);
  //設(shè)置VIewPager的觸摸事件.最后抽成方法.333
  ViewPagerTouchEvent();
 }

 /**
  * 注意:看一個(gè)方法或類的信息快捷鍵:Ctrl+Q;
  * 像ListVIew一樣,創(chuàng)建一個(gè)ViewPager的適配器,自定義一個(gè)類繼承PagerAdapter
  */
 private class Myadapter extends PagerAdapter {
  //getContent,設(shè)置ViewPager的條目個(gè)數(shù).一般就是集合或者資源數(shù)組的長(zhǎng)度.
  @Override
  public int getCount() {
   //把返回的條目設(shè)置為無(wú)限大.333
   //注意:一般和獲取ViewPager當(dāng)前選中的是第幾頁(yè)有關(guān)的都要改為position(當(dāng)前頁(yè)數(shù))%list.size()(取余數(shù)),你就看哪報(bào)錯(cuò),根據(jù)報(bào)錯(cuò)改333
   return Integer.MAX_VALUE;
  }

  //isViewFromObject,判斷ViewPager的條目View對(duì)象和InstantiateItem返回的Object對(duì)象是否一致,固定格式:return view==object;
  @Override
  public boolean isViewFromObject(View view, Object object) {
   return view == object;
  }

  //Ctrl+H:看到一個(gè)類的基礎(chǔ)結(jié)構(gòu)圖 ctrl+h+l:快速格式化.
  //instantiateItem,ViewPager添加條目的操作.container:VIewPager的化身,控件都是添加到他身上,position:代表用戶滑動(dòng)條目的位置
  @Override
  public Object instantiateItem(ViewGroup container, int position) {
   //根據(jù)條目所在位置(利用Position),從ImageViews集合里獲取相對(duì)應(yīng)的ImageVIew圖片.
   ImageView imageView = imageViews.get(position % imageResIds.length);
   //把得到ImageView對(duì)象,添加給VIewPager對(duì)象,也就是container,使用addView
   container.addView(imageView);
   //注意:你添加給VIewPager什么控件,就要返回該控件,給isViewFromObject進(jìn)行比較判斷,這里添加的是ImageView,返回的就是ImageView
   return imageView;
  }

  //防止內(nèi)存泄漏.相當(dāng)于ListView的復(fù)用container,銷毀一個(gè)page,該方法的實(shí)際就是將instantiateItem返回的VIew對(duì)象從ViewPager中移除,
  //container:還是ViewPager控件自身 position: object:則代表了View控件,使用時(shí)要強(qiáng)轉(zhuǎn)成View一下
  //補(bǔ)充:為什么參數(shù)是Object,而不直接是View,因?yàn)殡m然99%是view,但也有可能是Fragment,所以用Object,提高了可擴(kuò)展性.
  @Override
  public void destroyItem(ViewGroup container, int position, Object object) {
   //構(gòu)造方法刪除后,也是固定格式:container.removeView((View) object);
   container.removeView((View) object);
  }
 }


 /**
  * 更加圖片資源的數(shù)量,動(dòng)態(tài)的創(chuàng)建點(diǎn)222
  */
 public void dot() {
  //創(chuàng)建一個(gè)View對(duì)象;
  View view = new View(this);
  //為這個(gè)View對(duì)象設(shè)置背景setBackgroundResource
  view.setBackgroundResource(R.drawable.dot_normal);
  //為View對(duì)象設(shè)置寬高參數(shù),使用參數(shù)對(duì)象LayoutParams(int,int),給哪個(gè)容器,就用哪個(gè)容器創(chuàng)建
  LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(8, 8);
  //使用參數(shù)對(duì)象LayoutParams.leftMargin=int,相當(dāng)于布局里的padding.
  layoutParams.leftMargin = 8;
  //把準(zhǔn)備好的layoutParams參數(shù)對(duì)象,設(shè)置給View對(duì)象.setLayoutParams
  view.setLayoutParams(layoutParams);
  //最后容器對(duì)象.addView(VIwe);
  ll_dots.addView(view);
 }


 /**
  * 根據(jù)ViewPager的item的變化,也就是圖片切換的操作,設(shè)置對(duì)應(yīng)的點(diǎn)和文本.222
  *
  * @param position int ViewPager的item,也是圖片的位置
  */
 public void changeTextAndDot(int position) {
  //根據(jù)ViewPager的item的變化,設(shè)置對(duì)應(yīng)的文本.setText(descs[position]);
  viewpager_tv.setText(descs[position]);
  //對(duì)點(diǎn)進(jìn)行判斷是否是當(dāng)前頁(yè)的點(diǎn),用for循環(huán),拿到所有點(diǎn)的位置,然后和position對(duì)比
  for (int x = 0; x < imageResIds.length; x++) {
   //.getChildAt(x);拿到容器的子控件.得到VIew對(duì)象
   View childAt = ll_dots.getChildAt(x);
   //為View設(shè)置背景圖片,,使用三元運(yùn)算符.
   childAt.setBackgroundResource(x == position ? R.drawable.dot_focus : R.drawable.dot_normal);
  }
 }

 /**
  * 該方法主要設(shè)置VIewPager的觸摸事件,實(shí)現(xiàn)用戶的觸摸時(shí),不再自動(dòng)播放.switch中motionEvent.getActivity.333
  * 另一種實(shí)現(xiàn)的思路,是在ViewPager監(jiān)聽(tīng)事件里面,對(duì)ViewPager的狀態(tài)進(jìn)行判斷.閑置-滑動(dòng),和用戶交互中-移除滑動(dòng).
  * public void onPageScrollStateChanged(int state) {
  * //當(dāng)滑動(dòng)狀態(tài)發(fā)生改變的時(shí)候，手動(dòng)滑動(dòng)的時(shí)候，不能進(jìn)行界面切換操作
  * //SCROLL_STATE_IDLE : 空閑狀態(tài)
  * if (state == ViewPager.SCROLL_STATE_IDLE) {
  * //自動(dòng)切換界面
  * handler.sendEmptyMessageDelayed(VIEWPAGER_SWITCH_PAGE, 3000);
  * }else{
  * //停止自動(dòng)切換
  * //停止界面切換操作
  * handler.removeMessages(VIEWPAGER_SWITCH_PAGE);
  * }
  * }
  */
 public void ViewPagerTouchEvent() {
  viewpager_vp.setOnTouchListener(new View.OnTouchListener() {
   @Override
   public boolean onTouch(View view, MotionEvent motionEvent) {
    switch (motionEvent.getAction()) {
     case MotionEvent.ACTION_DOWN:
      //當(dāng)時(shí)MotionEvent.ACTION_DOWN和ACTION_MOVE,就移除handler發(fā)送的message.removeMessages.333
      handler.removeMessages(1);
      break;
     case MotionEvent.ACTION_MOVE:
      handler.removeMessages(1);
      break;
     //當(dāng)用戶手松開(kāi)時(shí)ACTION_UP,就繼續(xù)使用sendEmptyMessageDelayed發(fā)送handler的消息.333
     case MotionEvent.ACTION_UP:
      handler.sendEmptyMessageDelayed(1, 3000);
     default:
      break;
    }
    return false;
   }
  });
 }


 @Override
 protected void onDestroy() {
  super.onDestroy();
  handler.removeMessages(1);
 }
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent">
 <android.support.v4.view.ViewPager
  android:id="@+id/viewpager_vp"
  android:layout_width="wrap_content"
  android:layout_height="300dp" />
 <!-- 定義lineatLayout時(shí),background="#88000000",gravity="center_horizontal" padding="8dp"
   android:layout_alignBottom="@+id/viewpager_vp" 小點(diǎn)用一個(gè)LinearLayout來(lái)包裹.-->
 <LinearLayout
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:background="#88000000"
  android:gravity="center_horizontal"
  android:padding="8dp"
  android:layout_alignBottom="@+id/viewpager_vp"
  android:orientation="vertical">
  <!--此處狀態(tài)選擇器的選擇屬性是state_selected,而不是state_pressed,
   要知道他們的區(qū)別,引用圖片drawable,注意V是大寫,
   點(diǎn)是根據(jù)圖片的張數(shù),動(dòng)態(tài)創(chuàng)建的,所有我們的View還要注釋掉.-->text
  <TextView
   android:id="@+id/viewpager_tv"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:textColor="@android:color/white"
   android:text="我是帥哥"/>

  <LinearLayout
   android:id="@+id/ll_dots"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:orientation="horizontal"
   android:gravity="center_horizontal">
<!--   <View
    android:layout_width="5dp"
    android:layout_height="5dp"
    android:background="@drawable/dot_focus"/>-->
  </LinearLayout>
 </LinearLayout>
</RelativeLayout>