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First example with data binding
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‎com.vogella.android.testapp/.gitignore‎

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*.iml
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.gradle
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/local.properties
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/.idea/workspace.xml
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/.idea/libraries
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.DS_Store
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/build
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/captures

‎com.vogella.android.testapp/app/.gitignore‎

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/build

‎com.vogella.android.testapp/app/build.gradle‎

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apply plugin: 'com.android.application'
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android {
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compileSdkVersion 23
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buildToolsVersion "23.0.2"
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defaultConfig {
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applicationId "com.vogella.android.testapp"
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minSdkVersion 23
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targetSdkVersion 23
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versionCode 1
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versionName "1.0"
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}
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buildTypes {
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release {
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minifyEnabled false
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proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
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}
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}
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dataBinding {
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enabled = true;
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}
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}
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dependencies {
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compile fileTree(dir: 'libs', include: ['*.jar'])
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testCompile 'junit:junit:4.12'
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compile 'com.android.support:appcompat-v7:23.1.1'
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}

‎com.vogella.android.testapp/app/proguard-rules.pro‎

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# Add project specific ProGuard rules here.
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# By default, the flags in this file are appended to flags specified
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# in /home/vogella/Android/Sdk/tools/proguard/proguard-android.txt
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# You can edit the include path and order by changing the proguardFiles
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# directive in build.gradle.
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#
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# For more details, see
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# http://developer.android.com/guide/developing/tools/proguard.html
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# Add any project specific keep options here:
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# If your project uses WebView with JS, uncomment the following
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# and specify the fully qualified class name to the JavaScript interface
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# class:
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#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
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# public *;
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#}

‎com.vogella.android.testapp/app/src/androidTest/java/com/vogella/android/testapp/ApplicationTest.java‎

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package com.vogella.android.testapp;
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import android.app.Application;
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import android.test.ApplicationTestCase;
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/**
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* <a href="http://d.android.com/tools/testing/testing_android.html">Testing Fundamentals</a>
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*/
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public class ApplicationTest extends ApplicationTestCase<Application> {
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public ApplicationTest() {
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super(Application.class);
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}
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}

‎com.vogella.android.testapp/app/src/main/AndroidManifest.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.vogella.android.testapp">
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<application
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android:allowBackup="true"
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android:icon="@mipmap/ic_launcher"
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android:label="@string/app_name"
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android:supportsRtl="true"
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android:theme="@style/AppTheme">
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<activity android:name=".MainActivity">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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</application>
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</manifest>

‎com.vogella.android.testapp/app/src/main/java/com/vogella/android/testapp/MainActivity.java‎

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package com.vogella.android.testapp;
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import android.app.Activity;
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import android.databinding.DataBindingUtil;
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import android.os.Bundle;
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import com.vogella.android.testapp.databinding.ActivityMainBinding;
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public class MainActivity extends Activity {
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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String textFieldValue ="";
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ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
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MainActivityHandlers handler = new MainActivityHandlers();
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binding.setHandler(handler);
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}
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}

‎com.vogella.android.testapp/app/src/main/java/com/vogella/android/testapp/MainActivityHandlers.java‎

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package com.vogella.android.testapp;
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import android.content.Context;
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import android.databinding.BaseObservable;
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import android.databinding.Bindable;
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import android.databinding.BindingAdapter;
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import android.databinding.ObservableField;
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import android.text.Editable;
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import android.text.TextWatcher;
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import android.view.View;
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import android.widget.EditText;
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import android.widget.Toast;
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import java.util.Objects;
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public class MainActivityHandlers extends BaseObservable {
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public ObservableField<String> textFieldValue = new ObservableField<>();
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private Context context;
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public void onClick(View view) {
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context = view.getContext();
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Toast.makeText(context, textFieldValue.get(), Toast.LENGTH_SHORT).show();
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}
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@Bindable
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public String getName() {
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return textFieldValue.get();
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}
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public void setName(String name) {
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textFieldValue.set(name);
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notifyPropertyChanged(com.vogella.android.testapp.BR.name);
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}
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public final TextWatcher textWatcher = new TextWatcher() {
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@Override
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public void afterTextChanged(Editable s) {
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if(!s.toString().equalsIgnoreCase(getName()))
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setName(s.toString());
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}
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@Override
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public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
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@Override
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public void onTextChanged(CharSequence s, int start, int before, int count) {}
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};
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// // Add this to avoid that the setText method is called in case the model changes
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// @BindingAdapter("binding")
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// public static void bindEditText(EditText editText, CharSequence value) {
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// if (!editText.getText().toString().equals(value.toString())) {
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// editText.setText(value);
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// }
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// }
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}

‎com.vogella.android.testapp/app/src/main/res/layout/activity_main.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<layout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:bind="http://schemas.android.com/tools">
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<data>
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<variable
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name="handler"
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type="com.vogella.android.testapp.MainActivityHandlers" />
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</data>
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<RelativeLayout
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:paddingBottom="@dimen/activity_vertical_margin"
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android:paddingLeft="@dimen/activity_horizontal_margin"
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android:paddingRight="@dimen/activity_horizontal_margin"
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android:paddingTop="@dimen/activity_vertical_margin">
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<EditText
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android:id="@+id/main_input"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_alignParentTop="true"
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android:layout_alignParentStart="true"
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android:layout_alignParentEnd="true"
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android:addTextChangedListener="@{handler.textWatcher}"
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/>
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<Button
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_alignLeft="@+id/main_input"
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android:layout_below="@+id/main_input"
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android:layout_marginTop="31dp"
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android:onClick="@{handler.onClick}"
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android:text="Start" />
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</RelativeLayout>
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</layout>

‎com.vogella.android.testapp/app/src/main/res/mipmap-hdpi/ic_launcher.png‎

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