RecyclerView的使用和适配器

    private RecyclerView recycler_view;
    private List<String> list=new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        for (int i=0;i<3;i++){
            list.add("11111111111111111111111111111111111111111");
            list.add("222222222222222222");
            list.add("33333333333333333333333333333333333333333333333333333333333");
        }
        recycler_view=(RecyclerView)findViewById(R.id.recycler_view);

//        一：LinearLayoutManager  布局管理器
//        LinearLayoutManager linearLayoutManager=new LinearLayoutManager(this);
//        //设置方向(垂直)
//        linearLayoutManager.setOrientation(linearLayoutManager.VERTICAL);


//        二：GridLayoutManager  网格流
//          GridLayoutManager gridLayoutManager=new GridLayoutManager(this,2);

//        三：StaggeredGridLayoutManager  瀑布流

        StaggeredGridLayoutManager staggeredGridLayoutManager=new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL);
        //把布局管理器设置给RecyclerView
        recycler_view.setLayoutManager(staggeredGridLayoutManager);
        //设置适配器
        MyAdapter myAdapter = new MyAdapter(list, this);
        //把适配器设置给RecyclerView
        recycler_view.setAdapter(myAdapter);

        myAdapter.success(new MyAdapter.HttpLister() {
            @Override
            public void success(int position) {
                Toast.makeText(MainActivity.this,position+"====",Toast.LENGTH_LONG).show();
            }
        });

    }

}

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder>{
    private List<String> list;
    private Context context;

    public MyAdapter(List<String> list, Context context) {
        this.list = list;
        this.context = context;
    }
    //创建ViewHolder
    @Override
    public MyAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        //获取layout布局
        View view = View.inflate(context, R.layout.layout_item, null);
        //把ViewHolder new出来
        MyViewHolder myViewHolder = new MyViewHolder(view);
        //招到TextView的id
        myViewHolder.txt_item=view.findViewById(R.id.item);

        return myViewHolder;
    }
    //可以给View设置数据
    @Override
    public void onBindViewHolder(MyAdapter.MyViewHolder holder, final int position) {

        holder.txt_item.setText(list.get(position));
        //设置条目点击事件
        holder.txt_item.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                lister.success(position);
            }
        });

    }
    //获取数据的长度
    @Override
    public int getItemCount() {
        return list.size();
    }
    //创建一个ViewHolder
    public class MyViewHolder extends RecyclerView.ViewHolder{
        public MyViewHolder(View itemView) {
            super(itemView);
        }
        TextView txt_item;
    }
    private HttpLister lister;
    public void success(HttpLister lister){
        this.lister=lister;
    }
    //接口回调
    public interface HttpLister{
        void success(int position);
    }
}