Here is my app.It has a timer that it will take screenshot whenever you want :).Rate and comment please 
We can trade comments and rates
https://play.google.com/store/apps/details?id=com.dogukan.time2shot
Here is my app.It has a timer that it will take screenshot whenever you want :).Rate and comment please We can trade comments and rates
https://play.google.com/store/apps/details?id=com.dogukan.time2shot