ViewBinding 初探-在Activity和Adapter中使用

升级android studio后（主要是gradle升级后），butterknife 不再被支持；

现在google主推ViewBinding 

一下就是我用ViewBinding 做的一个小demo，展示ViewBinding 的使用

一、build.gradle配置

        1、ViewBinding

android {
    ……
    buildFeatures {
        viewBinding = true
    }
}

        2、dependencies 相关配置

dependencies {
    ……

    //RecyclerView 列表
    implementation 'androidx.recyclerview:recyclerview:1.2.0-beta01'

}

二、界面展示

三、activity代码

        1、activity_main.xml  代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <EditText
            android:id="@+id/etName"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textColor="#000000"
            android:textSize="18sp"
            android:hint="名称"/>

        <EditText
            android:id="@+id/etAge"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textColor="#000000"
            android:inputType="number"
            android:textSize="18sp"
            android:hint="年龄"/>

        <Button
            android:id="@+id/btnAdd"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="添加"/>

    </LinearLayout>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:gravity="center|left"
        android:paddingLeft="20dp"
        android:background="#D9F8F5"
        android:textColor="#000000"
        android:textSize="18sp"
        android:text="数据列表-点击可删除"/>
    
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rvData"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</LinearLayout>

        2、MainActivity  代码

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;

import android.os.Bundle;

import com.xolo.myobjectbox.databinding.ActivityMainBinding;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    //系统依据 activity_main.xml 自动生成的 ActivityMainBinding 类,通过 ActivityMainBinding 可以获取对应的控件
    ActivityMainBinding mainBinding;

    private StudentAdapter studentAdapter;
    private List<StudentModel> list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main); -需要注释掉
        //加载界面
        mainBinding = ActivityMainBinding.inflate(getLayoutInflater());
        setContentView(mainBinding.getRoot());

        //添加StudentAdapter适配器
        list = new ArrayList<>();
        studentAdapter = new StudentAdapter(this, list, o -> {
            list.remove((int)o);
            studentAdapter.notifyDataSetChanged();
        });
        mainBinding.rvData.setLayoutManager(new GridLayoutManager(this, 1));
        mainBinding.rvData.setNestedScrollingEnabled(true);
        mainBinding.rvData.setAdapter(studentAdapter);

        //添加点击事件
        mainBinding.btnAdd.setOnClickListener(v -> {
            String name = mainBinding.etName.getText().toString();
            String age = mainBinding.etAge.getText().toString();

            list.add(0, new StudentModel(name, age));
            studentAdapter.notifyDataSetChanged();
        });

    }
    
}

四、adapter代码

        1、adapter_student.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="wrap_content"
    android:orientation="vertical"
    android:padding="5dp"
    android:background="#FFFFFF"
    android:layout_marginBottom="1dp"
    android:id="@+id/llClick">

    <TextView
        android:id="@+id/tvName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="name："
        android:textColor="#000000"
        android:textSize="18sp" />

    <TextView
        android:id="@+id/tvAge"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="age："
        android:textColor="#000000"
        android:textSize="18sp" />


</LinearLayout>

        2、StudentAdapter

import android.annotation.SuppressLint;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.ViewGroup;

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

import com.xolo.myobjectbox.databinding.AdapterStudentBinding;

import java.util.List;

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

    private Context context;
    private List<StudentModel> list;
    private ClickInterface clickInterface;

    public StudentAdapter(Context context, List<StudentModel> list, ClickInterface clickInterface) {
        this.context = context;
        this.list = list;
        this.clickInterface = clickInterface;
    }

    @NonNull
    @Override
    public StudentAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        //界面设置
        AdapterStudentBinding studentBinding = AdapterStudentBinding.inflate(LayoutInflater.from(context), parent, false);
        return new ViewHolder(studentBinding);
    }

    @SuppressLint("SetTextI18n")
    @Override
    public void onBindViewHolder(@NonNull StudentAdapter.ViewHolder holder, int position) {
        holder.studentBinding.tvName.setText("姓名："+list.get(position).getName());
        holder.studentBinding.tvAge.setText("年龄："+list.get(position).getAge());
        holder.studentBinding.llClick.setOnClickListener(v -> clickInterface.ClickOnThe(position));
    }

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

    public class ViewHolder extends RecyclerView.ViewHolder {
        系统依据 activity_main.xml 自动生成的 AdapterStudentBinding 类,通过 ActivityMainBinding 可以获取对应的控件
        AdapterStudentBinding studentBinding;
        public ViewHolder(@NonNull AdapterStudentBinding itemView) {
            super(itemView.getRoot());
            studentBinding = itemView;
        }
    }
}

五、Interface代码

public interface ClickInterface {
    void ClickOnThe(Object o);
}

六、Model代码

public class StudentModel {

    private String name;
    private String age;

    public StudentModel() {
    }

    public StudentModel(String name, String age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

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

    public String getAge() {
        return age;
    }

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

七、代码界面展示