RecyclerView实现横向滚动

绝地灬酷狼 2022-06-11 00:44 308阅读 0赞

**Fruit Class**

public class Fruit {
        
        private int fruitImageId; //图片的ID
        private String fruitName; //水果名字
    
        public Fruit(String fruitName,int fruitImageId) { //构造函数进行初始化 ,用于创建新的对象的value
            this.fruitImageId = fruitImageId;
            this.fruitName = fruitName;
        }
    
        public int getFruitImageId() {  //获得对象(水果)ID(例如R.id.fruitID)
            return fruitImageId;
        }
    
        public String getFruitName() { //获得对象的名字(字符串类型)
            return fruitName;
        }
    }
    FruitAdapter Class
    public class FruitAdapter extends RecyclerView.Adapter<FruitAdapter.ViewHolder>{
        
    
    List<Fruit> mfruitList;
    
        public FruitAdapter(List<Fruit> mfruitList) { //对水果列表集合进行初始化 , 构造函数
            this.mfruitList = mfruitList; //把要展示的数据源传进来,并赋值给mfruitList,后续的工作都基于这个数据源
        }
    
        @Override
        public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { //创建HoldView的实例,并把实例返回
            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.fruit,parent,false); //将fruit的布局加载进来
            ViewHolder holder = new ViewHolder(view); 
            return holder;
        }
    
        @Override
        public void onBindViewHolder(ViewHolder holder, int position) {
            Fruit fruit = mfruitList.get(position); //通过positon,获得当前对象Fruit的实例
            holder.fruitImage.setImageResource(fruit.getFruitImageId()); //设置实例的图片
            holder.fruitName.setText(fruit.getFruitName()); //设置实例的名字
        }
    
        @Override
        public int getItemCount() {
            return mfruitList.size();//获得对象的数量,返回数据源的长度.
        }
    
        static class ViewHolder extends RecyclerView.ViewHolder {
        
    
            ImageView fruitImage;
            TextView fruitName;
            public ViewHolder(View View) { //view是RecyclerView子项的最外层布局,通过view findViewById()方法,
                                            //就能找到外层的fruit_image和fruit_name的id
                super(View);
                fruitImage = (ImageView) View.findViewById(R.id.fruit_image);
                fruitName = (TextView) View.findViewById(R.id.fruit_name);
            }
        }
    }

**MainActivity Class**

public class MainActivity extends AppCompatActivity {
        
    
        List<Fruit> fruitlist = new ArrayList<Fruit>();
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            initFruits(); //初始化水果数据
            RecyclerView recyclerView = (RecyclerView) findViewById(recycler_view);
            LinearLayoutManager layoutManager = new LinearLayoutManager(this); //线性布局的意思,实现ListView功能
            layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL ); //设置布局横向排列
            recyclerView.setLayoutManager(layoutManager); //layoutmanager用于指定recyclerview的布局方式        FruitAdapter adapter = new FruitAdapter(fruitlist);//将水果的数据传入到FruitAdapter中        recyclerView.setAdapter(adapter); //完成适配器设置,建立关联    }    void initFruits(){        for(int i=0;i<2;i++){            Fruit apple = new Fruit("Apple",R.drawable.apple);            fruitlist.add(apple);            Fruit banana = new Fruit("Banana",R.drawable.banana);            fruitlist.add(banana);            Fruit cherry = new Fruit("Cherry",R.drawable.cherry);            fruitlist.add(cherry);            Fruit grape = new Fruit("Grape",R.drawable.grape);            fruitlist.add(grape);            Fruit mango = new Fruit("Mango",R.drawable.mango);            fruitlist.add(mango);            Fruit orange = new Fruit("Orange",R.drawable.orange);            fruitlist.add(orange);            Fruit pear = new Fruit("Pear",R.drawable.pear);            fruitlist.add(pear);            Fruit pineapple = new Fruit("Pineapple",R.drawable.pineapple);            fruitlist.add(pineapple);            Fruit strawberry = new Fruit("Strawberry",R.drawable.strawberry);            fruitlist.add(strawberry);            Fruit watermelon = new Fruit("Watermelon",R.drawable.watermelon);            fruitlist.add(watermelon);        }    }}

**activity\_main.xml**

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        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">
    
        </android.support.v7.widget.RecyclerView>
    </LinearLayout>

**fruit.xml**

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
         android:layout_width="100dp" //让每个水果的文字所占的空间一样大,美观
        android:layout_height="wrap_content"
        android:orientation="vertical" //改成垂直方向排列
        >
        <ImageView
            android:id="@+id/fruit_image"
            android:src="@drawable/apple"
            android:layout_gravity="center_horizontal"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    
        <TextView
            android:id="@+id/fruit_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="苹果"
            android:layout_gravity="center_horizontal"
            android:layout_marginTop="10dp"
            android:textColor="#000" />
    
    </LinearLayout>