Android App Development, Android SDK, Android Studio, Gradle. Location tracking, Google Maps, Open Street Map Social Networking, Facebook API, Instagram API, Twitter API, Foursquare API, LinkedIn API, Messengers, Chat, Pubnup, Stickers Image Downloading, Image Uploading, Image Processing, Image Capturing Video streaming, Video capturing, Sound playing, Sound Capturing. Git, GitHub, Bitbucket, Jira, SourceTree