After several days of hard work, I have just published an Android app of mine: Screenstash!
The app uses the new api for screen capturing and sharing of Android 5.0 Lollipop to help you take screenshots rapidly and organize them in stashes (folders) in your external memory.
Because it uses the new android.media.projection APIs, the app works only with Android Lollipop onward.
It features a floating button, like the bubble button of the Facebook Messenger app, to let you take screenshots while you use the smartphone. Of course I use a little delay to hide the button when you take the screenshot.
You can also crop the image, selecting the area of the screen that you want.
I also tried to adapt the underlying GridLayoutManager (of the RecyclerView) to larger screens of tablets.
It is ads supported (the ad view disappear after a while and reappears at each Activity resume: I tried not to be too invasive in this).
I also use Mixpanel to gather some anonymous data usage. You can disable it in the settings, anyway.
It is still a work in progress but I hope you enjoy it, as I enjoyed in building it!
Let me know what you think about it! Get it on Google Play!