RecyclerView的简单使用

activity_main.xml：

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

fruit_item.xml：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"     android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_margin="5dp">    <ImageView        android:id="@+id/fruit_image"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center_horizontal"/>    <TextView        android:id="@+id/fruit_name"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="left"        android:layout_marginTop="10dp"/></LinearLayout>

Fruit实体类：

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 void setName(String name) {        this.name = name;    }    public int getImageId() {        return imageId;    }    public void setImageId(int imageId) {        this.imageId = imageId;    }}

FruitAdapter：

public class FruitAdapter extends RecyclerView.Adapter<FruitAdapter.ViewHolder> {    private List<Fruit> mFruitList;    static class ViewHolder extends RecyclerView.ViewHolder{        ImageView fruitImage;        TextView fruitName;        public ViewHolder(View view){            super(view);            fruitImage = view.findViewById(R.id.fruit_image);            fruitName = view.findViewById(R.id.fruit_name);        }    }    public FruitAdapter(List<Fruit> fruitList){        mFruitList = fruitList;    }    @Override    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View view = LayoutInflater.from(parent.getContext()).inflate(                R.layout.fruit_item,parent,false);        final ViewHolder holder = new ViewHolder(view);        holder.fruitImage.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Fruit fruit = mFruitList.get(holder.getAdapterPosition());                Toast.makeText(view.getContext(),"you clicked view "+fruit.getName(),Toast.LENGTH_SHORT).show();            }        });        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();    }}

MainActivity：

public class MainActivity extends AppCompatActivity {    List<Fruit> fruitList = new ArrayList<>();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initFruit();        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);        StaggeredGridLayoutManager manager = new StaggeredGridLayoutManager(3,                StaggeredGridLayoutManager.VERTICAL);        recyclerView.setLayoutManager(manager);        FruitAdapter adapter = new FruitAdapter(fruitList);        recyclerView.setAdapter(adapter);    }    public void initFruit(){        for (int i = 0; i < 2; i++) {            Fruit apple = new Fruit(getRandomLengthName("Apple"), R.drawable.apple_pic);            fruitList.add(apple);            Fruit banana = new Fruit(getRandomLengthName("Banana"), R.drawable.banana_pic);            fruitList.add(banana);            Fruit orange = new Fruit(getRandomLengthName("Orange"), R.drawable.orange_pic);            fruitList.add(orange);            Fruit watermelon = new Fruit(getRandomLengthName("Watermelon"), R.drawable.watermelon_pic);            fruitList.add(watermelon);            Fruit pear = new Fruit(getRandomLengthName("Pear"), R.drawable.pear_pic);            fruitList.add(pear);            Fruit grape = new Fruit(getRandomLengthName("Grape"), R.drawable.grape_pic);            fruitList.add(grape);            Fruit pineapple = new Fruit(getRandomLengthName("Pineapple"), R.drawable.pineapple_pic);            fruitList.add(pineapple);            Fruit strawberry = new Fruit(getRandomLengthName("Strawberry"), R.drawable.strawberry_pic);            fruitList.add(strawberry);            Fruit cherry = new Fruit(getRandomLengthName("Cherry"), R.drawable.cherry_pic);            fruitList.add(cherry);            Fruit mango = new Fruit(getRandomLengthName("Mango"), R.drawable.mango_pic);            fruitList.add(mango);        }    }    public String getRandomLengthName(String name){        Random random = new Random();        int length = random.nextInt(20)+1;        StringBuilder builder = new StringBuilder();        for(int i = 0; i < length; i++){            builder.append(name);        }        return builder.toString();    }}