配置环境

一、在app module的build.gradle如下配置

android {
    ...
    dataBinding {
        enabled = true
    }
}

二、修改布局文件

根布局改成<layout>

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">

    <data>
        <variable name="user" type="net.dou7.learndatabinding.models.User" />
    </data>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:padding="@dimen/activity_vertical_margin">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@{user.name}" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text='@{String.valueOf(user.age)}' />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text='@{user.lolita ? "萝莉" : "不是萝莉"}' />
    </LinearLayout>
</layout>

修改Activity

public class MainActivity extends AppCompatActivity {

    ActivityMainBinding mBinding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // setContentView(R.layout.activity_main); //no
        mBinding = DataBindingUtil.setContentView(this, R.layout.activity_main); // yes
        // 设置数据
        mBinding.setUser(new User("安妮", 12, true));
    }
}

一个User类

public class User {

    private String name;

    private int age;

    private boolean lolita;

    // 省略getter，setter
}

运行之后