In this example opening url in webview and showing progress Dialog for page. Show file chooser option on clicking file option for web form . Open new link from webview to external browser. For any url open new activity or do other task.
You can save and retrieve key, value pair data from Shared preferences.
SharedPreferences values will persist across user sessions. Data in shared preferences will be persistent even though user closes the application.
In this example capturing video by inbuild camera in android and save captured video on sdcard. Using camera intent to record video and after record the video again come back on activity and show captured video path on activity.
In this example sending device to device (Mobile To Mobile) messaging using google cloud messaging (GCM). it is the very basic example you can use this to create advance level messaging application. Using php as server side language and mysql database.
Students can also use this project for semester project.