Add Android Annotations to project

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.your.application.id">

    <application
        android:label="@string/app_name"
        android:icon="@mipmap/ic_launcher"
        android:theme="@style/Theme.AppCompat.Light.DarkActionBar">

        <activity
            //change Activity class to generated class from AA
            android:name="com.your.application.id.activity.SampleActivity_"
            android:label="@string/app_name"
            android:screenOrientation="portrait">

            <intent-filter android:label="@string/app_name">
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER" />
                <category android:name="android.intent.category.DEFAULT"/>
                <action android:name="android.intent.action.VIEW"/>
            </intent-filter>

        </activity>

    </application>

</manifest>

app_build.gradle

//==========  app build.gradle ===================

apply plugin: 'com.android.application'
//apply android-apt plugin
apply plugin: 'com.neenbedankt.android-apt'

android {
    compileSdkVersion 21
    buildToolsVersion "21.1.2"

    defaultConfig {
        applicationId "com.your.application.id"
        minSdkVersion 16
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

//add apt arguments, note: gradle version 1.0+
apt {
    arguments {
        androidManifestFile variant.outputs[0].processResources.manifestFile
        resourcePackageName android.defaultConfig.applicationId
    }
}

dependencies {
    //add these 2 lines
    compile "org.androidannotations:androidannotations-api:3.2"
    apt "org.androidannotations:androidannotations:3.2"

    compile fileTree(dir: 'libs', include: ['*.jar'])
}

build.gradle

//======== Top level build.gradle ==============
buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.1.0'
        //add this line
        classpath 'com.neenbedankt.gradle.plugins:android-apt:1.4'
    }
}

allprojects {
    repositories {
        jcenter()
    }
}