How can I add a JAR in my gradle project?

Question

I am using gradle in Android studio for an android project. I have a jar that I downloaded called TestFlightAppLib.jar. This jar isn't present in the maven repository so I can't just put it in my build.gradle.

How can I add this JAR file to my project? I don't see any option to add an external jar to the project.

Update

This is my complete build.gradle

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.6.+'
    }
}
apply plugin: 'android'

repositories {
    mavenCentral()
}

android {
    compileSdkVersion 18
    buildToolsVersion "18.1.1"

    defaultConfig {
        minSdkVersion 8
        targetSdkVersion 18
    }

}

dependencies {
    compile 'com.actionbarsherlock:actionbarsherlock:4.4.0@aar'
    compile 'com.android.support:support-v4:18.0.+'
    compile 'com.google.code.gson:gson:2.2.4'
    compile 'com.squareup.retrofit:retrofit:1.2.2'
    compile 'com.github.rtyley:roboguice-sherlock:1.5'
    compile 'org.roboguice:roboguice:2.0'
    compile files('libs/TestFlightLib.jar')
}

This is the error message:

Gradle: Execution failed for task ':MyProject:compileDebug'.
> Compilation failed; see the compiler error output for details.
/Users/droid/android/MyProjectProject/MyProject/src/main/java/com/mypkg/ui/activity/MainApplication.java
Gradle: error: package com.testflightapp.lib does not exist

Here is the class:

import com.testflightapp.lib.TestFlight;


public class MainApplication  {

}

Answer 1

just add

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

to your dependencies in the build.gradle then all the jars in the libs folder will be included.