Imports from Jar not resolving

Question

I created a JAR that has two .class files in them. I then added the jar to the libs folder and added the dependency into my gradle file by doing this

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

I then run into a strange issue that can be seen in the image below.

I can reference the class and use its methods, but then I do a clean/build project I get errors because the imports didnt resolve. I get a Error:(22, 27) error: package com.android.biomini does not exist

Answer 1

the classes inside the jar should be inside a folder hierarchy similar to the package name. So inside the jar (which is just a zip) you should have com/android/biomini/BioMiniAndroid.class ..

One other remark, the 'com.android' package is already used by android so try using something else like com.yourcompany.biomini

Answer 2

Right click the jar file in libs folder and select 'Add as Library'. It will then get added to build.gradle automatically.