Android项目实战之仿网易新闻的页面（RecyclerView ）

<?xml version="1.0" encoding="utf-8"?><LinearLayout ...> <ViewPager ... /> <android.support.v7.widget.RecyclerView .../></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <android.support.v7.widget.RecyclerView  android:id="@+id/rcv_article_latest"  android:layout_width="match_parent"  android:layout_height="0dp"  android:layout_weight="1" /></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <!--ViewPager 热门文章图片展示--> <FrameLayout  android:layout_width="match_parent"  android:layout_height="200dp"  android:background="@color/gray_light">  <android.support.v4.view.ViewPager   android:id="@+id/vp_hottest"   android:layout_width="match_parent"   android:layout_height="match_parent"   android:background="@color/colorPrimary" />  <LinearLayout   android:id="@+id/ll_hottest_indicator"   android:layout_width="wrap_content"   android:layout_height="20dp"   android:layout_gravity="bottom|right"   android:layout_marginBottom="5dp"   android:layout_marginRight="10dp"   android:layout_marginTop="5dp"   android:gravity="center"   android:orientation="horizontal" /> </FrameLayout></LinearLayout>

<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:fresco="http://schemas.android.com/apk/res-auto" android:id="@+id/cv_item" android:layout_width="match_parent" android:layout_height="wrap_content" app:cardCornerRadius="5dp" app:cardElevation="5dp" app:contentPadding="2dp"> <LinearLayout  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:orientation="horizontal">  <com.facebook.drawee.view.SimpleDraweeView   android:id="@+id/rcv_article_photo"   android:layout_width="100dp"   android:layout_height="100dp"   fresco:actualImageScaleType="centerInside"   fresco:roundAsCircle="true"   fresco:roundingBorderColor="@color/lightslategray"   fresco:roundingBorderWidth="1dp" />  <LinearLayout   android:layout_width="0dp"   android:layout_height="match_parent"   android:layout_weight="1"   android:orientation="vertical">   <TextView    android:id="@+id/rcv_article_title"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_marginLeft="10dp"    android:layout_marginTop="2dp"    android:gravity="center"    android:text="关于举办《经典音乐作品欣赏与人文审美》讲座的通知"    android:textColor="@color/primary_text" />   <!-- 新闻 发布时间 来源 阅读次数-->   <LinearLayout    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:layout_marginTop="5dp"    android:gravity="center"    android:orientation="horizontal">    <TextView     android:id="@+id/rcv_article_date"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_marginLeft="10dp"     android:layout_marginRight="2dp"     android:text="2015-01-09" />    <TextView     android:id="@+id/rcv_article_source"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_marginLeft="2dp"     android:layout_marginRight="2dp"     android:text="科学研究院" />    <TextView     android:id="@+id/rcv_article_readtimes"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_marginLeft="2dp"     android:layout_marginRight="2dp"     android:text="1129次" />   </LinearLayout>   <TextView    android:id="@+id/rcv_article_preview"    android:layout_width="wrap_content"    android:layout_height="0dp"    android:layout_weight="1"    android:layout_marginLeft="10dp"    android:layout_marginTop="5dp"    android:ellipsize="end"    android:maxLines="2"    android:text="讲座主要内容：以中、西方音乐历史中经典音乐作品为基础，通过作曲家及作品创作背景、相关音乐文化史知识及音乐欣赏常识..." />  </LinearLayout> </LinearLayout></android.support.v7.widget.CardView>

/** * 新闻列表的适配器 * 01-14 头部是 ViewPager，下面是列表新闻 * Created by tomchen on 1/11/16. */public class ArticleAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> { private static final int TYPE_HEADER = 0; private static final int TYPE_ITEM = 1; //头部固定为 张图片 private static final int NUM_IMAGE = 4; //Handler 用到的参数值 private static final int UPTATE_VIEWPAGER = 0; //新闻列表 private List<ItemArticle> articleList; //设置当前 第几个图片 被选中 private int currentIndex = 0; //context private Context context; private LayoutInflater mLayoutInflater; private ImageView[] mCircleImages;//底部只是当前页面的小圆点 public ArticleAdapter(Context context, List<ItemArticle> articleList) {  this.context = context;  //头部viewpager图片固定是7张，剩下的是列表的数据  this.articleList = articleList;  mLayoutInflater = LayoutInflater.from(context); } @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {  //理论上应该把最可能返回的 TYPE 放在前面  View view = null;  if (viewType == TYPE_ITEM) {   view = mLayoutInflater.inflate(     R.layout.viewholder_article_item, parent, false);   return new ItemArticleViewHolder(view);  }  //头部返回 ViewPager 实现的轮播图片  if (viewType == TYPE_HEADER) {   view = mLayoutInflater.inflate(     R.layout.viewholder_article_header, parent, false);   return new HeaderArticleViewHolder(view);  }  return null;//  //可以抛出异常，没有对应的View类型//  throw new RuntimeException("there is no type that matches the type " + viewType + " + make sure your using types correctly"); } @Override public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {  if (holder instanceof ItemArticleViewHolder) {   //转型   ItemArticleViewHolder newHolder = (ItemArticleViewHolder) holder;   //注意RecyclerView第0项是 ViewPager 占据了0 1 2 3图片   //那么下面的列表展示是 RecyclerView 的第1项，从第4项开始   ItemArticle article = articleList.get(position + NUM_IMAGE - 1);   newHolder.rcvArticlePhoto.setImageURI(Uri.parse(article.getImageUrl()));   newHolder.rcvArticleTitle.setText(article.getTitle());   newHolder.rcvArticleDate.setText(article.getPublishDate());   newHolder.rcvArticleSource.setText(article.getSource());   //注意这个阅读次数是 int 类型，需要转化为 String 类型   newHolder.rcvArticleReadtimes.setText(article.getReadTimes() + "次");   newHolder.rcvArticlePreview.setText(article.getPreview());  } else if (holder instanceof HeaderArticleViewHolder) {   HeaderArticleViewHolder newHolder = (HeaderArticleViewHolder) holder;   List<ItemArticle> headers = articleList.subList(0, NUM_IMAGE );   HeaderImageAdapter imageAdapter = new HeaderImageAdapter(context, headers);   setUpViewPager(newHolder.vpHottest, newHolder.llHottestIndicator, headers);  } } private void setUpViewPager(final ViewPager vp, LinearLayout llBottom, final List<ItemArticle> headerArticles) {  HeaderImageAdapter imageAdapter = new HeaderImageAdapter(context, headerArticles);  //??这儿有些疑惑，Adapter 里面嵌套设置 Adapter 是否优雅？  vp.setAdapter(imageAdapter);  final Handler mHandler = new Handler() {   public void handleMessage(Message msg) {    switch (msg.what) {     case UPTATE_VIEWPAGER:      if (msg.arg1 != 0) {       vp.setCurrentItem(msg.arg1);      } else {       //false 当从末页调到首页是，不显示翻页动画效果，       vp.setCurrentItem(msg.arg1, false);      }      break;    }   }  };  //下面是设置动画切换的样式  vp.setPageTransformer(true, new RotateUpTransformer());  //创建底部指示位置的导航栏  final ImageView[] mCircleImages = new ImageView[headerArticles.size()];  for (int i = 0; i < mCircleImages.length; i++) {   ImageView imageView = new ImageView(context);   LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(10, 10);   params.setMargins(5, 0, 5, 0);   imageView.setLayoutParams(params);   if (i == 0) {    imageView.setBackgroundResource(R.drawable.indicator_select);   } else {    imageView.setBackgroundResource(R.drawable.indicator_not_select);   }   mCircleImages[i] = imageView;   //把指示作用的原点图片加入底部的视图中   llBottom.addView(mCircleImages[i]);  }  vp.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {   //图片左右滑动时候，将当前页的圆点图片设为选中状态   @Override   public void onPageSelected(int position) {    // 一定几个图片，几个圆点，但注意是从0开始的    int total = mCircleImages.length;    for (int j = 0; j < total; j++) {     if (j == position) {      mCircleImages[j].setBackgroundResource(R.drawable.indicator_select);     } else {      mCircleImages[j].setBackgroundResource(R.drawable.indicator_not_select);     }    }    //设置全局变量，currentIndex为选中图标的 index    currentIndex = position;   }   @Override   public void onPageScrolled(int i, float v, int i1) {   }   @Override   public void onPageScrollStateChanged(int state) {    //实现切换到末尾后返回到第一张    switch (state) {     // 手势滑动     case ViewPager.SCROLL_STATE_DRAGGING:      break;     // 界面切换中     case ViewPager.SCROLL_STATE_SETTLING:      break;     case ViewPager.SCROLL_STATE_IDLE:// 滑动结束，即切换完毕或者加载完毕      // 当前为最后一张，此时从右向左滑，则切换到第一张      if (vp.getCurrentItem() == vp.getAdapter()        .getCount() - 1) {       vp.setCurrentItem(0, false);      }      // 当前为第一张，此时从左向右滑，则切换到最后一张      else if (vp.getCurrentItem() == 0) {       vp.setCurrentItem(vp.getAdapter()         .getCount() - 1, false);      }      break;     default:      break;    }   }  });  //设置自动轮播图片，5s后执行，周期是5s  Timer timer = new Timer();  timer.schedule(new TimerTask() {   @Override   public void run() {    Message message = new Message();    message.what = UPTATE_VIEWPAGER;    if (currentIndex == headerArticles.size() - 1) {     currentIndex = -1;    }    message.arg1 = currentIndex + 1;    mHandler.sendMessage(message);   }  }, 6000, 6000); } @Override public int getItemCount() {  //因为多了一个头部，所以是+1,但是头部 ViewPager 占了7个  //所以实际是少了6个  return articleList.size() + 1 - NUM_IMAGE; } @Override public int getItemViewType(int position) {  if (position == 0)   return TYPE_HEADER;  else   return TYPE_ITEM; } class HeaderArticleViewHolder extends RecyclerView.ViewHolder {  //轮播的最热新闻图片  @InjectView(R.id.vp_hottest)  ViewPager vpHottest;  //轮播图片下面的小圆点  @InjectView(R.id.ll_hottest_indicator)  LinearLayout llHottestIndicator;  //学院广播信息  @InjectView(R.id.tv_college_broadcast)  TextView tvCollegeBroadcast;  public HeaderArticleViewHolder(View itemView) {   super(itemView);   ButterKnife.inject(this, itemView);  } } class ItemArticleViewHolder extends RecyclerView.ViewHolder {  @InjectView(R.id.rcv_article_photo)  SimpleDraweeView rcvArticlePhoto;  @InjectView(R.id.rcv_article_title)  TextView rcvArticleTitle;  @InjectView(R.id.rcv_article_date)  TextView rcvArticleDate;  @InjectView(R.id.rcv_article_source)  TextView rcvArticleSource;  @InjectView(R.id.rcv_article_readtimes)  TextView rcvArticleReadtimes;  @InjectView(R.id.rcv_article_preview)  TextView rcvArticlePreview;  public ItemArticleViewHolder(View itemView) {   super(itemView);   ButterKnife.inject(this, itemView);  } }}