1.配置

在gradle里面配置如下

android{
   dataBinding{
        enabled=true
    }
}

2.使用

1.xml里面

以前我们的布局是这样的

 <LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  ...
   >
        <TextView
    
            android:text="..."/>
 </LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<layout
    xmlns:android="http://schemas.android.com/apk/res/android"
  >
    <data>
        <variable
            name="user"
            type="com.melo.app.mvvm.UserInfo" />
    </data>

    <LinearLayout
          ...>
         <TextView
            ...
            android:text="@{user.name}"
          />
         <TextView
            ...
            android:text="@{user.sex}"
          />
    </LinearLayout>
</layout>

2.activity中

public class MainActivity extends AppCompatActivity {

    UserInfo userInfo;
    ActivityMainBinding viewDataBinding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        viewDataBinding = DataBindingUtil.setContentView(this, R.layout.activity_main);
        userInfo = new UserInfo("德玛西亚",  "男"));
        viewDataBinding.setUser(userInfo);
    }
}

public class UserInfo {

   String name;
   String sex;

    public UserInfo(String name, String sex) {
        this.name = name;
        this.sex = sex;
    }

    public String getName() {
        return name;
    }

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

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }
}

3.运行 搞定

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