...
android {
  compileSdkVersion 23
  buildToolsVersion "23.0.2"

  defaultConfig {
    applicationId "ro.pub.cs.systems.eim.practicaltest02"
    minSdkVersion 16
    targetSdkVersion 23
    versionCode 1
    versionName "1.0"
  }
  
  buildTypes {
    release {
      minifyEnabled false
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
  }

  useLibrary 'org.apache.http.legacy'
}
...