Databinding与RecyclerView的使用

1、build.gradle的配置

android {
    ...
    buildFeatures {
        dataBinding true
    }
}

2、进行简单布局

activity_main的布局

item_layout的布局

MainActivity的使用

import androidx.appcompat.app.AppCompatActivity;
import androidx.databinding.DataBindingUtil;
import androidx.recyclerview.widget.LinearLayoutManager;

import android.os.Bundle;

import com.example.bindingrecyclerview.adapter.RecyclerViewAdapter;
import com.example.bindingrecyclerview.databinding.ActivityMainBinding;
import com.example.bindingrecyclerview.model.User;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    private ActivityMainBinding binding;
    private RecyclerViewAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
        ArrayList users = new ArrayList<>();
        for (int i = 0; i <1000;i++){
            User user = new User();
            user.setAge("20");
            user.setUsername("姓名"+i);
            user.setRose("管理员"+i);
            users.add(user);
        }
        binding.recyclerview.setLayoutManager(new LinearLayoutManager(this));
        adapter = new RecyclerViewAdapter(users);
        binding.recyclerview.setAdapter(adapter);
    }
}

adapter 的使用

import android.view.LayoutInflater;
import android.view.ViewGroup;

import com.example.bindingrecyclerview.R;
import com.example.bindingrecyclerview.databinding.ItemLayoutBinding;
import com.example.bindingrecyclerview.model.User;

import java.util.ArrayList;

import androidx.annotation.NonNull;
import androidx.databinding.DataBindingUtil;
import androidx.recyclerview.widget.RecyclerView;

public class RecyclerViewAdapter extends RecyclerView.Adapter {

    ArrayList  list;
    public RecyclerViewAdapter(ArrayList list) {
        this.list = list;
    }

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        ItemLayoutBinding binding = DataBindingUtil.inflate(LayoutInflater.from(parent.getContext()),
                R.layout.item_layout
                ,parent,
                false);
        return new MyViewHolder(binding);
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
        User user = list.get(position);
        MyViewHolder viewHolder = (MyViewHolder)holder;
        viewHolder.itemBinding.setViewModel(user);
    }

    @Override
    public int getItemCount() {
        return list.size();
    }

    class MyViewHolder extends RecyclerView.ViewHolder{
        ItemLayoutBinding itemBinding;
        public MyViewHolder(@NonNull ItemLayoutBinding itemView) {
            super(itemView.getRoot());
            itemBinding = itemView;
        }
    }
}