Required Java,Mobile App freelancer for finish existing app - debug & finish it up for me please job

I've got a semi-working existing app that I've developed myself, but I have introduced some bugs I can't figure out myself , the app is like Rewardable TV app , I am using Firebase along with it ..... attached is the app source code as it exists currently ..... need you to debug it , getting it back to functional state , and to do some minor additional things with it , please ...... the only thing the app really does , is show a funny GIF images for 10 seconds , and then proceed to showing an Admob video ad , then it loops again back to funny GIF image viewing for another 10 seconds , and then back to ads watching ; that is all I need it to do ....... I will provide you with access to all you need ,,,, please let me know what you will charge me to help me finish this app ?

Skills & Expertise Required

Java Mobile App