AndroidStudioでローカルの別プロジェクトをインポートする ref: http://qiita.com/konifar/items/c9f66482ebdca404f8fa

build.gradle

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile project(':libraries:pulltorefresh')
}

file1.txt

Error:(28, 0) Project with path ':libraries:pulltorefresh' could not be found in project ':app'.

settings.gradle

include ':app', 'libraries:pulltorefresh'