Android Studio第12课关于databinding

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• 一、开启Databinding
• 二、添加依赖
• 三、打开网络权限
• 四、生成databinding布局
• 五、创建数据类
• 六、在data变量中声明变量及类全名
• 七、通过@{}使用变量；（默认值无需加引号，且只在预览视图显示）
• 八、databinding在recycleview中使用
• 总结

//在build.gradle中添加
android {
    compileSdk 32
    dataBinding{
        enabled=true
    }

 implementation("com.squareup.okhttp3:okhttp:4.9.3")
    implementation 'com.squareup.retrofit2:retrofit:2.9.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
    implementation 'com.squareup.okhttp3:logging-interceptor:4.9.3'

    implementation 'com.github.bumptech.glide:glide:4.13.0'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.13.0'

光标在布局文件的根布局–>点击Alt + Enter–>点击 “Convert to data binding layout”

package com.hnucm.databinding;

import androidx.databinding.BaseObservable;

public class Person extends BaseObservable {
    public int age;
    public String name;

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
        notifyChange();
    }
}

 ActivityMainBinding activityMainBinding;
    public List chatlist = new ArrayList<>();
    MyAdapter myAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        activityMainBinding = DataBindingUtil.setContentView(this,R.layout.activity_main);
        Api api = RetrofitUtils.getRetrofit("http://121.4.44.56/").create(Api.class);
        Call chatItemCall = api.getChatList();
        chatItemCall.enqueue(new Callback() {
            @Override
            public void onResponse(Call call, Response response) {
                ChatItem chatItem = response.body();
                chatlist.addAll(chatItem.chatlist);
                myAdapter.notifyDataSetChanged();
            }

            @Override
            public void onFailure(Call call, Throwable t) {

            }
        });
        myAdapter = new MyAdapter();
        activityMainBinding.recyclerView.setAdapter(myAdapter);
        activityMainBinding.recyclerView.setLayoutManager(new LinearLayoutManager(this));
    }

    public class MyAdapter extends RecyclerView.Adapter{

        @NonNull
        @Override
        public MyViewHodler onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            ChatItemBinding chatItemBinding = DataBindingUtil.
                    inflate(LayoutInflater.from(MainActivity.this),R.layout.chat_item,parent,false);
            MyViewHodler myViewHodler = new MyViewHodler(chatItemBinding.getRoot());
            myViewHodler.chatItemBinding = chatItemBinding;
            return myViewHodler;
        }

        @Override
        public void onBindViewHolder(@NonNull MyViewHodler holder, int position) {
            holder.chatItemBinding.setItemlist(chatlist.get(position));
        }

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

    public class MyViewHodler extends RecyclerView.ViewHolder{
       public  ChatItemBinding chatItemBinding;
        public MyViewHodler(@NonNull View itemView) {
            super(itemView);
        }
    }

}

好了，那么今天的学习就到这里了。友友们觉得不错的可以给个关注，点赞或者收藏哦！感谢各位友友们的支持。以下的代码希望各位大佬们自行检验哦，毕竟亲手操作让记忆更加深刻。