android developer needed for small tasks

need 2 tweaks on my android app 1- When you search a file and press search tls, it shows all searched files and checkboxes with them so i can download them in phone. What I want is that it should show checkboxes with those files only which are not on phone. So for example, if i search 0 and press search tls, it will show all files, i will select all and download them. now if again i start app and press 0 and click search tls, now it should not show check box with all files, it should only show check box with those files which were not downloaded on phone. 2- I need to add one more button added after search tls, name that button "check new and updated files". What it will do is that it will function same as search tls button but it will show checkboxes with those files only which are updated after the previous download or if there is any new files I have more tasks after this if done successfully and in cheap rate. Kindly type "android" at the starting of your bid to be considered.