Android RecycleView

01.RecycleView的结构

• 关于RecyclerView，大家都已经很熟悉了，用途十分广泛，大概结构如下所示
  • RecyclerView.Adapter - 处理数据集合并负责绑定视图
  • ViewHolder - 持有所有的用于绑定数据或者需要操作的View
  • LayoutManager - 负责摆放视图等相关操作
  • ItemDecoration - 负责绘制Item附近的分割线
  • ItemAnimator - 为Item的一般操作添加动画效果，如，增删条目等
• 如图所示，直观展示结构
  • 

02.RecyclerView简单用法

• 针对上面几个属性，最简单用法如下所示

  recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
  LinearLayoutManager layoutManager = new LinearLayoutManager(this);
  //设置layoutManager
  recyclerView.setLayoutManager(layoutManager);
  final RecycleViewItemLine line = new RecycleViewItemLine(this, LinearLayout.HORIZONTAL,1,this.getResources().getColor(R.color.colorAccent));
  //设置添加分割线
  recyclerView.addItemDecoration(line);
  adapter = new MultipleItemAdapter(this);
  //设置adapter
  recyclerView.setAdapter(adapter);
  //添加数据并且刷新adapter
  adapter.addAll(list);
  adapter.notifyDataSetChanged();
  
  
  //adapter
  //onCreateViewHolder(ViewGroup parent, int viewType)这里的第二个参数就是View的类型，可以根据这个类型判断去创建不同item的ViewHolder
  public class MultipleItemAdapter extends RecyclerView.Adapter<recyclerview.viewholder> {
      public static enum ITEM_TYPE {
          ITEM_TYPE_IMAGE,
          ITEM_TYPE_TEXT
      }
       
      private final LayoutInflater mLayoutInflater;
      private final Context mContext;
      private ArrayList<String> mTitles;
   
      public MultipleItemAdapter(Context context) {
          mContext = context;
          mLayoutInflater = LayoutInflater.from(context);
      }
   
      @Override
      public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
          if (viewType == ITEM_TYPE.ITEM_TYPE_IMAGE.ordinal()) {
              return new ImageViewHolder(mLayoutInflater.inflate(R.layout.item_image, parent, false));
          } else {
              return new TextViewHolder(mLayoutInflater.inflate(R.layout.item_text, parent, false));
          }
      }
   
      @Override
      public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
          if (holder instanceof TextViewHolder) {
              ((TextViewHolder) holder).mTextView.setText(mTitles[position]);
          } else if (holder instanceof ImageViewHolder) {
              ((ImageViewHolder) holder).mTextView.setText(mTitles[position]);
          }
      }
   
      @Override
      public int getItemViewType(int position) {
          return position % 2 == 0 ? ITEM_TYPE.ITEM_TYPE_IMAGE.ordinal() : ITEM_TYPE.ITEM_TYPE_TEXT.ordinal();
      }
   
      @Override
      public int getItemCount() {
          return mTitles == null ? 0 : mTitles.length;
      }
      
      public void addAll(ArrayList<String> list){
          if(mTitles!=null){
              mTitles.clear();
          }else {
              mTitles = new ArrayList<>();
          }
          mTitles.addAll(list);
      }
   
      public static class TextViewHolder extends RecyclerView.ViewHolder {
          @InjectView(R.id.text_view)
          TextView mTextView;
          TextViewHolder(View view) {
              super(view);
              ButterKnife.inject(this, view);
          }
      }
   
      public static class ImageViewHolder extends RecyclerView.ViewHolder {
          @InjectView(R.id.text_view)
          TextView mTextView;
          @InjectView(R.id.image_view)
          ImageView mImageView;
          ImageViewHolder(View view) {
              super(view);
              ButterKnife.inject(this, view);
          }
      }
  }