RecyclerView的基本用法(第一行代码android学习笔记)

首先在build.guide中添加代码:compile 'com.android.support.support:recyclerview-v7:(Android API版本 如26.0.0 )'

然后在布局中应用:

<LinearLayout ........../>

      <android.support.v7.widget.RecyclerView

             android:id=...

             //长宽等各种属性

          />

</LinearLayout>

用RecyclerView实现和ListView相同的效果,首先要为RecyclerView准备一个适配器,假如是要实现水果图标和名称的显示,则命名适配器为FruitAdapter,它继承自RecyclerView.Adapter,并且把泛型定为<FruitAdapter.ViewHolder>

代码:

public class FruitAdapter extends RecyclerView.Adapter<FruitAdapter.ViewHolder>{

    private List<Fruit> mFruitList;

    //定义一个静态的内部类ViewHolder继承自RecyclerView.ViewHolder,并且重写它的构造方法

    static class ViewHolder extends RecyclerView.ViewHolder{

        ImageView fruitimage;

        TextView fruitname;

       public ViewHolder(View view){

              super(view);

              fruitImage = (ImageView) view.findViewById(R.id.fruit_image);

              fruitName = (TextView) view.findViewById(R.id.fruit_name);

}

}

     public FruiAdapter(List<Fruit> fruitList){

            mFruitList = fruitList;

}

         //重写方法OnCreateViewHolder,onBindViewHolder,getItemCount

         @Override

          public ViewHolder OnCreateViewHolder(ViewGroup parent,int view Type){

                 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 positon){

                 Fruit fruit = mFruitList.get(position);

                 holder.fruitImage.setImageResource(fruit.getImageId());

                 holder.fruitName.setText(fruit.getName());

}

         @Override

          public int getItemCount(){

                return mFruitList.size();

}

}

实现RecyclerView,

private List<Fruit> fruitList = new ArrayList<>();

@Override

protected void onCreate(Bundle saveInstanceState){

      ...

      initFruits();//初始化水果数据

      RecyclerView recyclerview = (RecyclerView) findViewById(R.id.recycler_view);

      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",picture_apple);

           fruitList.add(apple);

      ....

} 

}