Android RecyclerView 瀑布流

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:background="@android:color/holo_blue_light">

     <ImageView
         android:id="@+id/iv"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:gravity="center"
         android:padding="10dp"
         android:src="@mipmap/ic_launcher"
         android:scaleType="fitXY"
         android:adjustViewBounds="true"/>

 </LinearLayout>

item_layout.xml

导入RecyclerView包

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/activity_main"
     android:layout_width="match_parent"
     android:layout_height="match_parent">

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

     </android.support.v7.widget.RecyclerView>
 </RelativeLayout>

activity_main.xml

 public class MainActivity extends AppCompatActivity {

     RecyclerView mRecycleView;
     List<Image> mList = new ArrayList<>();

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         mRecycleView = (RecyclerView) findViewById(R.id.recyclerview);
         //初始化数据
         initData();
         //设置适配器
         mRecycleView.setAdapter(new MyAdapter());
         //设置布局管理器
         //mRecycleView.setLayoutManager(new LinearLayoutManager(this));//与ListView类似
         mRecycleView.setLayoutManager(new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL));
         //设置item分割线

         //设置item动画
     }

     private void initData() {
         for (int i = 1; i <= 20; i++) {
             try {

                 mList.add(new Image(R.mipmap.class.getField("img0"+i).getInt(null)));

             } catch (IllegalAccessException e) {
                 e.printStackTrace();
             } catch (NoSuchFieldException e) {
                 e.printStackTrace();
             }
         }

     }

     //布局的内容组件
     class MyViewHolder extends RecyclerView.ViewHolder{

         ImageView iv;

         public MyViewHolder(View itemView) {
             super(itemView);
             iv = (ImageView) itemView.findViewById(R.id.iv);
         }
     }

     //适配器，继承RecyclerView.Adapter,泛型，里面必须是Recycler.ViewHolder的子类
     class MyAdapter extends RecyclerView.Adapter<MyViewHolder>{

         /**
          * 一个页面没有加载完毕，会持续调用该方法。
          * @param parent
          * @param viewType
          * @return
          */
         @Override
         public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
             //创建ViewHolder
             //导入布局
             View layout = View.inflate(getBaseContext(),R.layout.item_layout,null);
             MyViewHolder viewHolder = new MyViewHolder(layout);
             return viewHolder;
         }

         @Override
         public void onBindViewHolder(MyViewHolder holder, int position) {
             //为每一个布局设置属性。
             //holder  组件
             //当前第几项， mList.get(position)拿到数据，给holder设置

             holder.iv.setImageResource(mList.get(position).imgId);
         }

         @Override
         public int getItemCount() {
             return mList.size();
         }
     }

     class Image{
         int imgId;
         public Image(int imgId){
             this.imgId = imgId;
         }
     }
 }

MainActivity.java