文章目录

• • • 导入依赖
    • 简单使用
    • 实现横向滚动
    • 瀑布式

导入依赖

  file→Project Structure…→Dependencies→ app→ + → Library Dependency。

  输入androidx.recyclerview，然后点击Search。

简单使用

  修改activity_main.xml中的代码。在布局中加入RecyclerView控件也是非常简单的，先为RecyclerView指定一个id，然后将宽度和高度都设置为match_parent，这样RecyclerView就占满了整个布局的空间。需要注意的是，由于RecyclerView并不是内置在系统SDK当中的，所以需要把完整的包路径写出来。

  自定义布局fruit_item.xml。

  编写Fruit类。

public class Fruit {     private String name;     private int imageId;      public Fruit(String name,int imageId){         this.name = name;         this.imageId = imageId;     }     public String getName(){         return name;     }     public int getImageId(){         return imageId;     } } 

  创建一个继承自ArrayAdapter的自定义适配器FruitAdapter。

public class FruitAdapter extends RecyclerView.Adapter {      private List mFruitList;      static class ViewHolder extends RecyclerView.ViewHolder{         ImageView fruitImage;         TextView fruitName;         public ViewHolder(View view){             super(view);             fruitImage = (ImageView)  view.findViewById(R.id.fruitImage);             fruitName = (TextView) view.findViewById(R.id.fruitName);         }     }     public FruitAdapter(List fruitList){         mFruitList = fruitList;     }      @Override     public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {         View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.fruit_item, parent, false);         ViewHolder holder = new ViewHolder(view);         return holder;     }      @Override     public void onBindViewHolder(ViewHolder holder, int position){         Fruit fruit = mFruitList.get(position);         holder.fruitImage.setImageResource(fruit.getImageId());         holder.fruitName.setText(fruit.getName());     }      @Override     public int getItemCount(){         return mFruitList.size();     } } 

  最后修改MainActivity中的代码。

public class MainActivity extends AppCompatActivity {     private  List fruitList = new ArrayList<>();     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         initFruits(); // 初始化数据         RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);         LinearLayoutManager layoutManager = new LinearLayoutManager(this);         recyclerView.setLayoutManager(layoutManager);         FruitAdapter adapter = new FruitAdapter(fruitList);         recyclerView.setAdapter(adapter);     }     private void initFruits(){         for(int i = 0; i < 2; i++){             Fruit apple = new Fruit("Apple", R.mipmap.ic_launcher);             fruitList.add(apple);             Fruit banana = new Fruit("banana", R.mipmap.ic_launcher);             fruitList.add(banana);             Fruit orange = new Fruit("orange", R.mipmap.ic_launcher);             fruitList.add(orange);             Fruit waternelon = new Fruit("waternelon", R.mipmap.ic_launcher);             fruitList.add(waternelon);             Fruit pear = new Fruit("pear", R.mipmap.ic_launcher);             fruitList.add(pear);             Fruit grape = new Fruit("grape", R.mipmap.ic_launcher);             fruitList.add(grape);             Fruit pineapple = new Fruit("pineapple", R.mipmap.ic_launcher);             fruitList.add(pineapple);         }     } } 

实现横向滚动

  修改自定义布局fruit_item.xml。

     android:orientation="vertical"     android:layout_width="80dp"     android:layout_height="match_parent">                  android:layout_gravity="center_horizontal"         android:layout_marginTop="10dp"/>                        android:layout_gravity="center_horizontal"         android:layout_marginTop="10dp" />            

  修改MainActivity中的代码。传入LinearLayoutManager.HORIZONTAL表示让布局横行排列

protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         initFruits(); // 初始化数据         RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);         LinearLayoutManager layoutManager = new LinearLayoutManager(this);     	// 新加代码     	layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);     	// --------         recyclerView.setLayoutManager(layoutManager);         FruitAdapter adapter = new FruitAdapter(fruitList);         recyclerView.setAdapter(adapter);     } 

瀑布式

  修改自定义布局fruit_item.xml。

  修改自定义布局fruit_item.xml。

protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         initFruits(); // 初始化数据         RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);         /*LinearLayoutManager layoutManager = new LinearLayoutManager(this);         layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);*/         StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL);         recyclerView.setLayoutManager(layoutManager);         FruitAdapter adapter = new FruitAdapter(fruitList);         recyclerView.setAdapter(adapter);     }