Android app Development

I need help with Android app development...Have  been working on it , just need some addition continuation toward the app,you will continue the app from the main file attached..therefore, you will use the main file to do the part1 then then part 2 will be the continuity of part 1, then part 3 will be continuity of part 2 ,then part 4 will be continuity of part 3, Each part files done will be submited to me..