How to run app in Android Studio with shared library-module from other project?

Question

I use a self-written library-module within another project like it was suggested in

https://code.google.com/p/android/issues/detail?id=105570

and

Android Studio 0.8.1 Creating Modules without copying files?

I added the lines to settings.gradle and furthermore added the included library via "Project Structure"-Dialog as a dependency to the project. I use Android Studio 1.2.2.

Everything within the IDE looks fine (imports are working, library-code can be browsed and edited, both modules can be "maked" without errors), but I can't seem to launch the project on my phone / emulator.

I get a "classNotFoundException" for the first class from the library that is used in the app.

I copy-pasted the entire project class by class from Eclipse where it would run without problems.

What do I have to do to get the compiled classes of the library into my app onto my phone?

settings.gradle

include ':app'
include ':Sudoku'
project(':Sudoku').projectDir=new File('/../Libs/sudoku')

build.gradle (app)

apply plugin: 'com.android.application'

android {
    compileSdkVersion 22
    buildToolsVersion "22.0.1"

    defaultConfig {
        applicationId "com.frozenmilkmeteoroids.sudokuapp"
        minSdkVersion 15
        targetSdkVersion 22
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:appcompat-v7:22.2.0'
    compile project(':Sudoku')
}

build.gradle (library)

apply plugin: 'com.android.library'

android {
    compileSdkVersion 22
    buildToolsVersion "22.0.1"

    defaultConfig {
        minSdkVersion 15
        targetSdkVersion 22
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:22.2.0'
}

Can you post your settings.gradle and the app/build.gradle ? — Gabriele Mariotti, Jul 14 '15 at 17:31
Id't highly suggest bringing the project in a module or pushing the lib up to a remote online repo like jcenter. — Jared Burrows, Jul 14 '15 at 17:42
So Sudoku is the library? Does its build.gradle file apply the com.android.library plugin? — loosebazooka, Jul 14 '15 at 17:44
Yes and Yes. These were all generated by AS. @Jared I like to be able to edit the library and the code at the same time... — Omphaloskopie, Jul 14 '15 at 17:52
@Gabriele Yes, the code within the IDE is all okay, otherwise no import would work. — Omphaloskopie, Jul 14 '15 at 17:53

score 1 · Accepted Answer · answered Jul 26 '15 at 00:51

I also use Android Studio 1.2.2 and here is step by step of how to create the standalone library project and reference it from your main project:

create the android project library as you would for a normal android project. Call it libProjectName
rename the libProjectName's app module to libModuleName
in the libModuleName's build.gradle change: apply plugin: 'com.android.application' to apply plugin: 'com.android.library' and remove applicationId from defaultConfig section
Go to the main project i.e the project to reference libProjectName
edit settings.gradle, add:

include ':libProjectName:libModuleName'

project(':libProjectName:libModuleName').projectDir=new File('relative/path/libProjectDir/libModuleDir')

edit build.gradle in app Module, add:

compile project(':libProjectDir:libModuleName')

Now assuming that the module and module-directory name in Sudoku is moduleSudoku and applying the steps above, the solution is:

settings.gradle

include ':app'
include ':Sudoku:moduleSudoku'
project(':Sudoku:moduleSudoku').projectDir=new File('/../Libs/sudoku/moduleSudoku')

build.gradle (app)

apply plugin: 'com.android.application'

android {
    compileSdkVersion 22
    buildToolsVersion "22.0.1"

    defaultConfig {
        applicationId "com.frozenmilkmeteoroids.sudokuapp"
        minSdkVersion 15
        targetSdkVersion 22
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:appcompat-v7:22.2.0'
    compile project(':Sudoku:moduleSudoku')
}

build.gradle (library)

apply plugin: 'com.android.library'

android {
    compileSdkVersion 22
    buildToolsVersion "22.0.1"

    defaultConfig {
        minSdkVersion 15
        targetSdkVersion 22
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:22.2.0'
}

Hello! I am sorry that it took me so long to try it out. Thanks! I would like to furthermore point out that the 'relative/path/libProjectDir/libModuleDir' is '../libProjectName/app' if both projects are lying in the similar folder. — Omphaloskopie, Sep 11 '15 at 22:51

How to run app in Android Studio with shared library-module from other project?

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