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

package loonggg.net.databinding.bean;

/**
 * Created by loongggdroid on 2016/3/14.
 */
public class User {
 private String name;
 private String age;

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

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

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

 public String getName() {
  return this.name;
 }

 public String getAge() {
  return this.age;
 }
}

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

 <data>
  <variable
   name="user"
   type="loonggg.net.databinding.bean.User" />
 </data>

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

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

  <TextView
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="@{user.age}" />
 </LinearLayout>
</layout>

package loonggg.net.databinding;

import android.app.Activity;
import android.databinding.DataBindingUtil;
import android.os.Bundle;

import loonggg.net.databinding.bean.User;
import loonggg.net.databinding.databinding.ActivityMainBinding;

public class MainActivity extends Activity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
  User user = new User("loonggg", "23");
  binding.setUser(user);
 }

}

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

<!--type中声明的就是我们的用户实体类User，一定要写全，带着包名，我们给这个实体类命名为user-->
 <data>
  <variable
   name="user"
   type="loonggg.net.databinding.bean.User" />
 </data> 
 <LinearLayout>
  ……
 </LinearLayout>
</layout>

@Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
  User user = new User("loonggg", "23");
  binding.setUser(user);
 }

<data>
  <import type="loonggg.net.databinding.bean.User "/>
  <variablename="user"type="User" />
</data>

···
<data> 
 <import type="xxx.User" alias="MyUser"> 
 <import type="xxx.xx.User"> 

 <variable 
   name="user" 
   type="User" /> 
 <variable 
   name="myUser" 
   type="MyUser"/> 
</data> 
<TextView xxx:@{myUser.getName()}> 
<TextView xxx:@{user.getName()}>
···

<layout xmlns:android="http://schemas.android.com/apk/res/android"> 
  <data> 
   <import type="android.graphics.Bitmap" /> 
   <import type="java.util.ArrayList" /> 
   <import type="java.util.HashMap" /> 
   <!-- 集合的定义 -->
   <variable 
    name="list" 
    type="ArrayList<String>" /> 
   <variable 
    name="map" 
    type="HashMap<String, String>" /> 
   <variable 
    name="array" 
    type="String[]" /> 
   <!-- 为集合定义对应的索引 -->
   <variable 
    name="listKey" 
    type="int" /> 
   <variable 
    name="mapKey" 
    type="String" /> 
   <variable 
    name="arrayKey" 
    type="int" /> 

   <!-- 字符串，布尔值和int的用法-->
   <variable 
    name="str" 
    type="String"/> 
   <variable 
    name="error" 
    type="boolean"/> 
   <variable 
    name="num" 
    type="int" /> 

  </data> 

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

   <TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="@{list[listKey]}"/> 

   <TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="@{map[`name`]}"/> 
   <TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="@{array[0]}"/> 

   <TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="@{str}"/> 
   <TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="@{String.valueOf(num)}"/> 
  </LinearLayout> 
 </layout>

<variable
 name="clickListener"
 type="android.view.View.OnClickListener" />
...
 android:onClick="@{clickListener}"
...

holder.binding.setClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    //do something
  });

<TextView
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text='@{error ? "error" : "ok"}'/>

<TextView
   android:id="@+id/name"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   />

@Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
  binding.name.setText("非著名程序员");
 }