Add a dependency in Android Studio

http://stackoverflow.com/questions/23077521/where-and-why-add-repositories-on-build-gradle

https://jitpack.io/

1. Add repository in top level gradle file

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        jcenter()
        // do not add here
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.12.2'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
        // add repository here
        maven {
            url "https://jitpack.io"
        }
    }
}

2. add dependency to module level gradle file

apply plugin: 'com.android.application'

android {
    compileSdkVersion 19
    buildToolsVersion "20.0.0"

    defaultConfig {
        applicationId "app.tabsample"
        minSdkVersion 14
        targetSdkVersion 14
    }

    buildTypes {
        release {
            runProguard false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
        }
    }
}
dependencies {
    compile 'com.android.support:appcompat-v7:20.0.0'
    // add dependency here
    compile 'com.github.PhilJay:MPAndroidChart:v2.1.3'
}