Example with Parse jar...
Add jars to libs folder from Project view … create lib folder if not exists
Copy all jars there...
Add libs to gradle.... in build.gradle file :
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:23.0.0'
compile 'com.android.support:design:23.0.0'
compile 'com.android.support:percent:23.0.0'
compile 'com.parse.bolts:bolts-android:1.+'
compile fileTree(dir: 'libs', include: 'Parse-*.jar’)
}
For add all jars of lib folder... change Parse-*.jar to *.jar