Android Viewpager实现无限循环轮播图

@Override  public int getCount() {    return Integer.MAX_VALUE;//返回一个无限大的值，可以 无限循环  }

public Object instantiateItem (ViewGroup container, int position)

public void destroyItem (ViewGroup container, int position, Object object)

@Override  public void finishUpdate(ViewGroup container) {    super.finishUpdate(container);     int position = viewPager.getCurrentItem();        if (position == 0) {      position = simpleDraweeViewList.size() - 2;      viewPager.setCurrentItem(position,false);    } else if (position == simpleDraweeViewList.size() - 1) {      position = 1;      viewPager.setCurrentItem(position,false);    }  }

<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout 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=".MainActivity">   <FrameLayout    android:id="@+id/frameLayout"    android:layout_width="0dp"    android:layout_height="200dp"    app:layout_constraintEnd_toEndOf="parent"    app:layout_constraintHorizontal_bias="0.0"    app:layout_constraintStart_toStartOf="parent"    app:layout_constraintTop_toTopOf="parent">     <android.support.v4.view.ViewPager      android:id="@+id/viewPager"      android:layout_width="match_parent"      android:layout_height="match_parent"      tools:layout_editor_absoluteX="8dp"      tools:layout_editor_absoluteY="0dp" />     <LinearLayout      android:layout_width="match_parent"      android:layout_height="35dip"      android:layout_gravity="bottom"      android:background="#33000000"      android:gravity="center_vertical"      android:orientation="horizontal"      android:weightSum="10">       <TextView        android:id="@+id/tv_pager_title"        android:layout_width="0dp"        android:layout_height="35dip"        android:layout_weight="8"        android:gravity="center_vertical"        android:paddingLeft="8dip"        android:text="加载图片轮播失败"        android:textColor="@android:color/white" />       <LinearLayout        android:id="@+id/lineLayout_dot"        android:layout_width="0dp"        android:layout_height="match_parent"        android:layout_marginRight="5dp"        android:layout_weight="2"        android:gravity="center|right"        android:orientation="horizontal"        android:paddingLeft="3dp"        android:paddingRight="3dp" />     </LinearLayout>   </FrameLayout> </android.support.constraint.ConstraintLayout>

import android.content.Context;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.util.Log;import android.view.View;import android.view.ViewGroup; import com.facebook.drawee.view.SimpleDraweeView; import java.util.List; public class ImagesPagerAdapter extends PagerAdapter {  private List<SimpleDraweeView> simpleDraweeViewList;  private ViewPager viewPager;  private Context context;   private SimpleDraweeView simpleDraweeView;   public ImagesPagerAdapter(List<SimpleDraweeView> simpleDraweeViewList, ViewPager viewPager, Context context) {    this.simpleDraweeViewList = simpleDraweeViewList;    this.viewPager = viewPager;    this.context = context;  }   @Override  public int getCount() { return simpleDraweeViewList.size();  }   //删除指定位置的页面；适配器负责从view容器中删除view，然而它只保证在finishUpdate(ViewGroup)返回时才完成。  @Override  public void destroyItem(ViewGroup container, int position, Object object) {    // 把ImageView从ViewPager中移除掉    viewPager.removeView(simpleDraweeViewList.get(position));    //super.destroyItem(container, position, object);  }   //是否获取缓存  @Override  public boolean isViewFromObject(View view, Object object) {    return view == object;  }    //实例化Item  //在指定的位置创建页面；适配器负责添加view到这个容器中，然而它只保证在finishUpdate(ViewGroup)返回时才完成。  @Override  public Object instantiateItem(ViewGroup container, int position) {    simpleDraweeView = simpleDraweeViewList.get(position);    viewPager.addView(simpleDraweeView);    return simpleDraweeView;  }   @Override  public int getItemPosition(Object object) {    return POSITION_NONE;  }   //无论是创建view添加到容器中 还是 销毁view 都是在此方法结束之后执行的 @Override  public void finishUpdate(ViewGroup container) {    super.finishUpdate(container);     int position = viewPager.getCurrentItem();        if (position == 0) {      position = simpleDraweeViewList.size() - 2;      viewPager.setCurrentItem(position,false);    } else if (position == simpleDraweeViewList.size() - 1) {      position = 1;      viewPager.setCurrentItem(position,false);    }  }   /*  private int mChildCount = 0;  @Override  public void notifyDataSetChanged() {    mChildCount = getCount();    super.notifyDataSetChanged();  }  @Override  public int getItemPosition(Object object) {    if (mChildCount > 0) {      mChildCount--;      Log.e("image","getItemPosition");      return POSITION_NONE;    }    return super.getItemPosition(object);  }*/}

import android.app.Activity;import android.content.Context;import android.graphics.drawable.Drawable;import android.support.v4.content.ContextCompat;import android.support.v4.view.ViewPager;import android.util.Log;import android.view.View;import android.view.ViewGroup;import android.widget.LinearLayout;import android.widget.TextView; import com.facebook.drawee.view.SimpleDraweeView; import java.util.ArrayList;import java.util.List;   public class ImageCarousel {  private Context context;  private ViewPager viewPager;  private TextView tvTitle;  private LinearLayout dotsRoot;  private int time;    private List<View> dots;//小点  private int previousPosition = 1;//前一个被选中的position  private List<SimpleDraweeView> simpleDraweeViewList;  private String[] titles;//标题数组   private ImagesPagerAdapter adapter;   private AutoPlayThread autoPlayThread;  private volatile boolean isExit = true;   private static final int FIRST_PAGE = 1;    public ImageCarousel(Context context, ViewPager viewPager, TextView tvTitle,             List<View> dots, int time) {    this.context = context;    this.viewPager = viewPager;    this.tvTitle = tvTitle;    this.dots = dots;    this.time = time;    Log.e("image", "构造方法");  }     /**   * 传入数据   *   * @param simpleDraweeViewList SimpleDraweeView集合   * @param titles        标题数组   * @return this 本身   */  public ImageCarousel init(List<SimpleDraweeView> simpleDraweeViewList, String[] titles) {    this.simpleDraweeViewList = simpleDraweeViewList;    this.titles = titles;    Log.e("image", "init");    autoPlayThread = new AutoPlayThread();     return this;  }   /**   * 重新加载，有待考验...   *   * @param simpleDraweeViewList SimpleDraweeView集合   * @param titles        标题数组   */  public void reload(List<SimpleDraweeView> simpleDraweeViewList, String[] titles) {    init(simpleDraweeViewList, titles);    previousPosition = 0;    start();  }   /**   * 设置设配器，并实现轮播功能   */  public void start() {    if (adapter != null) {      adapter = null;    }    adapter = new ImagesPagerAdapter(this.simpleDraweeViewList, viewPager, context);    viewPager.setAdapter(adapter);    viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {      @Override      public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {       }       //当被选择      @Override      public void onPageSelected(int position) {         int currentPosition = 1;        if (position == simpleDraweeViewList.size() - 1) {          // 设置当前值为1          currentPosition = FIRST_PAGE;        } else if (position == 0) {          // 如果索引值为0了,就设置索引值为倒数第二个          currentPosition = simpleDraweeViewList.size() - 2;        } else {          currentPosition = position;        }         // 把当前选中的点给切换了, 还有描述信息也切换        tvTitle.setText(titles[currentPosition]);//图片下面设置显示文本        //设置轮播点 可设置成传入的图         Log.d("dots", "previousPosition=" + previousPosition + " currentPosition=" + currentPosition);        dots.get(previousPosition-1).setBackgroundResource(R.drawable.ic_dot_focused);        dots.get(currentPosition-1).setBackgroundResource(R.drawable.ic_dot_normal);        // 把当前的索引赋值给前一个索引变量, 方便下一次再切换.        previousPosition = currentPosition;      }       @Override      public void onPageScrollStateChanged(int state) {  // SCROLL_STATE_IDLE ：空闲状态   // SCROLL_STATE_DRAGGING ：滑动状态   // SCROLL_STATE_SETTLING ：滑动后滑翔的状态        if (state == ViewPager.SCROLL_STATE_DRAGGING) {         } else if(state == ViewPager.SCROLL_STATE_IDLE){     }      }    });     setFirstLocation();    //autoPlayThread.start();   }   /**   * 设置刚打开app时显示的图片和文字   */  private void setFirstLocation() {    tvTitle.setText(titles[0]);    dots.get(0).setBackgroundResource(R.drawable.ic_dot_normal);    viewPager.setCurrentItem(1);  }   /**   * 设置是否轮播   *   * @param b   */  private void setAutoPlay(boolean b) {    /*if (b && suspendRequested) {      autoPlayThread.requestResume();    } else if (!b){      autoPlayThread.requestSuspend();    }*/  }    public void stopAutoPlay() {    if (autoPlayThread != null) {      Log.e("thrad", "暂停");      isExit = true;      autoPlayThread.interrupt();      autoPlayThread = null;    }  }   /**   * 请求继续   */  public void startAutoPlay() {    Log.e("thrad", "开始");    isExit = false;    autoPlayThread = null;    autoPlayThread = new AutoPlayThread();    autoPlayThread.start();  }   /**   * 自动播放线程，添加暂停和继续方法   */  class AutoPlayThread extends Thread {     @Override    public synchronized void run() {      while (!isExit) {        try {          Thread.sleep(time);        } catch (InterruptedException e) {          Log.e("thrad", "强制请求退出线程");          break;        }        ((Activity) context).runOnUiThread(new Runnable() {          @Override          public void run() {            viewPager.setCurrentItem(viewPager.getCurrentItem() + 1);          }        });         if (this.interrupted()) {          Log.e("thrad", "已经是停止状态了，我要退出了");          break;        }      }     }   } }

import android.app.Activity;import android.content.Context;import android.graphics.drawable.Drawable;import android.net.Uri;import android.support.v4.content.ContextCompat;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.AbsListView;import android.widget.LinearLayout;import android.widget.TextView; import com.facebook.drawee.backends.pipeline.Fresco;import com.facebook.drawee.backends.pipeline.PipelineDraweeController;import com.facebook.drawee.drawable.ScalingUtils;import com.facebook.drawee.generic.GenericDraweeHierarchy;import com.facebook.drawee.generic.GenericDraweeHierarchyBuilder;import com.facebook.drawee.view.SimpleDraweeView;import com.facebook.imagepipeline.common.ResizeOptions;import com.facebook.imagepipeline.request.ImageRequest;import com.facebook.imagepipeline.request.ImageRequestBuilder; import java.util.ArrayList;import java.util.List; public class MainActivity extends AppCompatActivity implements View.OnClickListener {   // 图片轮播控件  private ViewPager mViewPager;  private TextView mTvPagerTitle;  private LinearLayout mLineLayoutDot;  private ImageCarousel imageCarousel;  private List<View> dots;//小点   // 图片数据，包括图片标题、图片链接、数据、点击要打开的网站（点击打开的网页或一些提示指令）  private List<ImageInfo> imageInfoList;   @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    initView();    initEvent();    imageStart();   }   @Override  public void onClick(View v) {   }   /**   * 初始化事件   * 左右多添加一张图片   */  private void initEvent() {    imageInfoList = new ArrayList<>(); imageInfoList.add(new ImageInfo(1, "图片5，公告5啦啦啦啦", "", "http://e.hiphotos.baidu.com/image/h%3D300/sign=73443062281f95cab9f594b6f9177fc5/72f082025aafa40fafb5fbc1a664034f78f019be.jpg", ""));    imageInfoList.add(new ImageInfo(2, "图片1，公告1啦啦啦啦", "", "http://d.hiphotos.baidu.com/image/pic/item/6159252dd42a2834a75bb01156b5c9ea15cebf2f.jpg", ""));    imageInfoList.add(new ImageInfo(3, "图片2，公告2啦啦啦啦", "", "http://c.hiphotos.baidu.com/image/h%3D300/sign=cfce96dfa251f3dedcb2bf64a4eff0ec/4610b912c8fcc3ce912597269f45d688d43f2039.jpg", ""));    imageInfoList.add(new ImageInfo(4, "图片3，公告3啦啦啦啦", "", "http://e.hiphotos.baidu.com/image/pic/item/6a600c338744ebf85ed0ab2bd4f9d72a6059a705.jpg", ""));    imageInfoList.add(new ImageInfo(5, "图片4，公告4啦啦啦啦", "", "http://b.hiphotos.baidu.com/image/h%3D300/sign=8ad802f3801001e9513c120f880e7b06/a71ea8d3fd1f4134be1e4e64281f95cad1c85efa.jpg", ""));    imageInfoList.add(new ImageInfo(6, "图片5，公告5啦啦啦啦", "", "http://e.hiphotos.baidu.com/image/h%3D300/sign=73443062281f95cab9f594b6f9177fc5/72f082025aafa40fafb5fbc1a664034f78f019be.jpg", "")); imageInfoList.add(new ImageInfo(7, "图片1，公告1啦啦啦啦", "", "http://d.hiphotos.baidu.com/image/pic/item/6159252dd42a2834a75bb01156b5c9ea15cebf2f.jpg", ""));   }   /**   * 初始化控件   */  private void initView() {     mViewPager = findViewById(R.id.viewPager);    mTvPagerTitle = findViewById(R.id.tv_pager_title);    mLineLayoutDot = findViewById(R.id.lineLayout_dot);   }   private void imageStart() {    //设置图片轮播    int[] imgaeIds = new int[]{R.id.pager_image1, R.id.pager_image2, R.id.pager_image3, R.id.pager_image4,        R.id.pager_image5, R.id.pager_image6, R.id.pager_image7, R.id.pager_image8};    String[] titles = new String[imageInfoList.size()];    List<SimpleDraweeView> simpleDraweeViewList = new ArrayList<>();     for (int i = 0; i < imageInfoList.size(); i++) {      titles[i] = imageInfoList.get(i).getTitle();      SimpleDraweeView simpleDraweeView = new SimpleDraweeView(this);      simpleDraweeView.setAspectRatio(1.78f);      // 设置一张默认的图片      GenericDraweeHierarchy hierarchy = new GenericDraweeHierarchyBuilder(this.getResources())          .setPlaceholderImage(ContextCompat.getDrawable(this, R.drawable.defult), ScalingUtils.ScaleType.CENTER_CROP).build();      simpleDraweeView.setHierarchy(hierarchy);      simpleDraweeView.setLayoutParams(new AbsListView.LayoutParams(AbsListView.LayoutParams.MATCH_PARENT, AbsListView.LayoutParams.WRAP_CONTENT));       //加载高分辨率图片;      ImageRequest imageRequest = ImageRequestBuilder.newBuilderWithSource(Uri.parse(imageInfoList.get(i).getImage()))          .setResizeOptions(new ResizeOptions(1280, 720))          .build();      PipelineDraweeController controller = (PipelineDraweeController) Fresco.newDraweeControllerBuilder()          //.setLowResImageRequest(ImageRequest.fromUri(Uri.parse(listItemBean.test_pic_low))) //在加载高分辨率图片之前加载低分辨率图片          .setImageRequest(imageRequest)          .setOldController(simpleDraweeView.getController())          .build();      simpleDraweeView.setController(controller);       simpleDraweeView.setId(imgaeIds[i]);//给view设置id      simpleDraweeView.setTag(imageInfoList.get(i));      simpleDraweeView.setOnClickListener(this);      titles[i] = imageInfoList.get(i).getTitle();      simpleDraweeViewList.add(simpleDraweeView);     }     dots = addDots(mLineLayoutDot, fromResToDrawable(this, R.drawable.ic_dot_focused), simpleDraweeViewList.size());    imageCarousel = new ImageCarousel(this, mViewPager, mTvPagerTitle, dots, 5000);    imageCarousel.init(simpleDraweeViewList, titles)        .startAutoPlay();    imageCarousel.start();   }    /**   * 动态添加一个点   *   * @param linearLayout 添加到LinearLayout布局   * @param backgount  设置   * @return 小点的Id   */  private int addDot(final LinearLayout linearLayout, Drawable backgount) {    final View dot = new View(this);    LinearLayout.LayoutParams dotParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,        ViewGroup.LayoutParams.WRAP_CONTENT);    dotParams.width = 16;    dotParams.height = 16;    dotParams.setMargins(4, 0, 4, 0);    dot.setLayoutParams(dotParams);    dot.setBackground(backgount);    dot.setId(View.generateViewId());    ((Activity) this).runOnUiThread(new Runnable() {      @Override      public void run() {        linearLayout.addView(dot);      }    });     return dot.getId();  }    /**   * 资源图片转Drawable   *   * @param context 上下文   * @param resId  资源ID   * @return 返回Drawable图像   */  public static Drawable fromResToDrawable(Context context, int resId) {    return ContextCompat.getDrawable(context, resId);  }   /**   * 添加多个轮播小点到横向线性布局   *   * @param linearLayout 线性横向布局   * @param backgount  小点资源图标   * @param number    数量   * @return 返回小点View集合   */  private List<View> addDots(final LinearLayout linearLayout, Drawable backgount, int number) {    List<View> dots = new ArrayList<>();    for (int i = 2; i < number; i++) {  // 注意这里的 i 从 2 开始，只画出5个点       int dotId = addDot(linearLayout, backgount);      dots.add(findViewById(dotId));     }    return dots;  }  }

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<vector android:height="5dp" android:viewportHeight="24.0"  android:viewportWidth="24.0" android:width="5dp" xmlns:android="http://schemas.android.com/apk/res/android">  <path android:fillColor="#c8fd8888" android:pathData="M12,12m-8,0a8,8 0,1 1,16 0a8,8 0,1 1,-16 0"/></vector>