Data Binding Guide

This document explains how to use the Data Binding Library to write declarative layouts and minimize the glue code necessary to bind your application logic and layouts.

Setting Up Work Environment:

dependencies {
       classpath "com.android.tools.build:gradle:1.3.0-beta4"
       classpath "com.android.databinding:dataBinder:1.0-rc1"
   }

In each module you want to use data binding, apply the plugin right after android plugin

    apply plugin: 'com.android.application'
    apply plugin: 'com.android.databinding'

BASIC REQUIREMENTS

Make sure you are using a compatible version of Android Studio. Android Studio 1.3

EXAMPLE :

Layout: activity_main.xml

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

<data>
        <variable name="user" type="com.example.devesh.myapplication.User"/>
    </data>

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <TextView android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{user.firstName}"/>
        <TextView android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{user.lastName}"/>

    </LinearLayout>
</layout>

Model Class USER :

package com.example.devesh.myapplication;

/**
 * Created by devesh on 21/9/15.
 */
public class User {
    public final String firstName;
    public final String lastName;
    public User(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }

}

MainActivity : how to use data binding

    public class MainActivity extends AppCompatActivity  {


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

        // note  ActivityMainBinding refers to layout file activity_main

            ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
       // only you need to set this user ,this will automatically reflects in your layout dynamically.  
          User user = new User("hello", "devesh");

            binding.setUser(user);
        }

Data will dynamically get set to your layout.