RecycleView的基本用法

RecycleView的用法

==============

1. build.gradle中加入：

   
   compile 'com.android.support:recyclerview-v7:23.1.1'
   
   

2. 布局文件引入：

   
   <android.support.v7.widget.RecyclerView
   
       android:id="@+id/recyclerView"
   
       android:layout_width="match_parent"
   
       android:layout_height="match_parent" />
   
   

3. 代码：

   
   RecyclerView recycleView = (RecyclerView) findViewById(R.id.recyclerView);
   
   

4. 准备要填充的数据

   
   private void initData() {
   
           urls = new ArrayList<>();
   
           urls.add(url1);
   
           urls.add(url2);
   
           urls.add(url3);
   
           urls.add(url4);
   
           urls.add(url5);
   
           urls.add(url6);
   
           urls.add(url7);
   
           urls.add(url8);
   
           urls.add(url9);
   
           urls.add(url10);
   
       }
   
   

5. 准备适配器

   
   public class MyAdapter extends RecyclerView.Adapter<MyVH> {
   
               private Context context;
   
               private List<String> urls;
   
   
   
               public MyAdapter(Context context, List<String> urls) {
   
                   this.context = context;
   
                   this.urls = urls;
   
               }
   
   
   
               //★1.onCreateViewHolder：
   
               //充气Item的View，并且以此View作为一个参数创建ViewHolder，并且返回此VH
   
               @Override
   
               public MyVH onCreateViewHolder(ViewGroup parent, int viewType) {
   
                   LayoutInflater inflater = LayoutInflater.from(context);
   
   // 要按照下面方式inflate布局，不然会出现match_parent无效，另外要让recyclerView宽高为match_parent(不一定)
   
                   View view = inflater.inflate(R.layout.item, parent,false);
   
                   return new MyVH(view);
   
               }
   
   
   
               //★2.onBindViewHolder:
   
               //在这里把List里的数据绑定到Item控件上
   
               @Override
   
               public void onBindViewHolder(MyVH holder, int position) {
   
                   Picasso.with(context).load(urls.get(position)).resize(300, 300).error(R.mipmap.qq).placeholder(R.mipmap.ic_launcher).into(holder.iv);
   
               }
   
   
   
               //★3.getItemCount
   
               //返回List的长度
   
               @Override
   
               public int getItemCount() {
   
                   return urls.size();
   
               }
   
   
   
               //★★★创建一个VH的子类，在这里执行findViewById，找到所有需要的控件
   
               public class MyVH extends RecyclerView.ViewHolder {
   
                   public ImageView iv;
   
                   public MyVH(View itemView) {
   
                       super(itemView);
   
                       iv = (ImageView) itemView.findViewById(R.id.iv);
   
                   }
   
               }
   
           }