fix issues of android file manager application

you have to use android studio 2.2.1 for this work or atleast the version which should keep the source code compatible to be opened on the owner's computer because he is using this android studio version. first of all, i recommend to install this app on your android device from the below link so you can better understand what are the issue facing and how we can fix it. here is the link of the app; [login to view URL] following are the issues in the app right now which needs to get fixed; 1. the data/files/folders are not sorting as requird from the given options in "Sort By". 2. the "Search" button is not helping to find the user the required file/folder or type of file/folder. 3. the app most of the time is getting held (ANR = application not responding) while trasnferring the data or opening a folder and eventually end in closing (crashing) the app or starting the activity after a very long time. 4. app got crash sometime without performing any activity. when we just open it or when just try to view the folders. 5. the "Rewarded Video Ads" of the Google Admob are not playing as they have to. When the user click on the button "Watch Video", no video ad displayed (there was no activity shown). fix these issues so we can work on next work of this app and other apps which can be done after it.