4.ObservableFields家族

1. 一个Person bean

public class Person {    
public ObservableField<String> name = new ObservableField<>();    
public ObservableInt age = new ObservableInt();    
public ObservableBoolean isMan = new ObservableBoolean();}

2. xml文件中

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

<data>    
<variable        
type="com.lefeee.dbdemoapplication.bean.Person"       
name="mPerson" />    
<variable        
type="com.lefeee.dbdemoapplication.MainActivity"        
name="click" />
</data>

<LinearLayout    
xmlns:tools="http://schemas.android.com/tools"    
android:id="@+id/activity_main"    
android:layout_width="match_parent"    
android:layout_height="match_parent"    
android:orientation="vertical"    
tools:context="com.lefeee.dbdemoapplication.MainActivity"> 
 
<TextView        
android:layout_width="wrap_content"        
android:layout_height="wrap_content"        
android:text="@{mPerson.name}" />    

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

<TextView        
android:layout_width="wrap_content"     
android:layout_height="wrap_content"        
android:text= '@{mPerson.isMan ? "man" : "woman"}'/>    

<Button        
android:layout_width="match_parent"        
android:layout_height="wrap_content"        
android:text="click"        
android:onClick="@{click.click}"  />

</LinearLayout>
</layout>

activity中

public class MainActivity extends AppCompatActivity {    
Person mPerson;    

@Override    
protected void onCreate(Bundle savedInstanceState) {      
  super.onCreate(savedInstanceState);        
  mPerson = new Person();        
  mPerson.name.set("jack");        
  mPerson.age.set(28);        
  mPerson.isMan.set(true);        
  ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);        
binding.setMPerson(mPerson);        
binding.setClick(this);    
}    

public void click(View view) {        
  mPerson.name.set("rose");        
  mPerson.age.set(22);        
  mPerson.isMan.set(false);        
Toast.makeText(getApplicationContext(), "click", Toast.LENGTH_SHORT).show();    
}

}