DataBinding入门四部曲

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概念请移步：https://developer.android.com/topic/libraries/data-binding/#data_binding_layout_files

• 一：build.gradle(Module:app) 启用databinding

android {
    ...

    dataBinding {
        enabled = true
    }
}

注意：Rebuild Project

• 二：布局应用

<?xml version="1.0" encoding="utf-8"?>
<layout
    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">

    <data>

        <variable
            name="user"
            type="com.rimowa.models.User"/>
    </data>
    
    <!--以下内容是你的根布局-->
    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">

        <com.rimowa.TopBar
            android:layout_width="match_parent"
            android:layout_height="50dp"
            app:topbarBg="@color/title_black"
            app:topbarLeftImage="@mipmap/ic_back"
            app:topbarLeftMode="more"
            app:topbarLeftType="img"
            app:topbarRightType="none">
        </com.rimowa.TopBar>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{user.name}"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent"/>

    </android.support.constraint.ConstraintLayout>
</layout>

• 三：bean创建

public class User extends BaseObservable {

    private String name;

    public User(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

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

• 四：绑定数据

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 无标题
        requestWindowFeature(Window.FEATURE_NO_TITLE);

        // ActivityMainBinding
        // 代替原来的setContentView(R.layout.activity_main)方法
        ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
        User user = new User("Hellow Android");
        // set方法是根据data标签下的variable名称自动生成的
        binding.setUser(user);
    }
}

赶快去试试吧。。。此文领进门，修行靠个人。