How to setup Dagger 2 in Android Studio

Step 1 - Build.gradle (Project Level) 

// Top-level build file where you can add configuration options common to

//all sub-projects/modules.

buildscript {

    repositories {

        jcenter()

    }

    dependencies {

        classpath 'com.android.tools.build:gradle:2.3.3'

        classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'

        // NOTE: Do not place your application dependencies here; they belong

        // in the individual module build.gradle files    }

}

allprojects {

    repositories {

        jcenter()

        maven{

            url = "https://maven.google.com"

        }

    }

}

task clean(type: Delete) {

    delete rootProject.buildDir

}

Step 2 - Build.gradle (Module Level)

apply plugin: 'com.android.application'

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

android {

    compileSdkVersion 25

    buildToolsVersion "25.0.2"

    defaultConfig {

        applicationId "com.verma.mobile.android.daggerdemo"

        minSdkVersion 15

        targetSdkVersion 25

        versionCode 1

        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"    }

    buildTypes {

        release {

            minifyEnabled false

            proguardFiles getDefaultProguardFile('proguard-android.txt'),

                          'proguard-rules.pro'        }

    }

}

ext {

       supportLibraryVersion = '25.2.0'

       daggerVersion = '2.6'

    }

dependencies {

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

    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {

        exclude group: 'com.android.support', module: 'support-annotations'

    })

    compile "com.android.support:appcompat-v7:$supportLibraryVersion"

    compile 'com.android.support.constraint:constraint-layout:1.0.1'

    testCompile 'junit:junit:4.12'

    compile  "com.google.dagger:dagger:$daggerVersion"

    apt "com.google.dagger:dagger-compiler:$daggerVersion"

}