Convert existing project to library project in Android Studio

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In your module’s build.gradle file (not the root project, if you use modules!), simply replace:

apply plugin: 'com.android.application'
// or, if you're on an old version
apply plugin: 'android' // note: this one is deprecated

…with:

apply plugin: 'com.android.library'
// or, if you're on an old version
apply plugin: 'android-library' // note: this one is deprecated

Note that recently, ‘android’ has changed to ‘com.android.application’, while ‘android-library’ has been changed to ‘com.android.library’. Avoid using the old names in new projects.

After updating your build.gradle file, you should Sync Project with Gradle files (which is in the toolbar), as not doing it might result in errors and things not working correctly.

Android Studio will then update some files to indicate that the module is now a library; as this will be added into your .iml file:

<option name="LIBRARY_PROJECT" value="true" />

As you might already know, you will not be able to run your (now) library project — you will need to include it into an app project.

If you’re using Android Studio 1.0 and you are getting “Library projects cannot set applicationId”, make sure you do not have applicationId in your Gradle build file.

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