In line with Android OS changes, please access local files using ES File Explorer, which will root the drive/SD cards. You will need to go in to ES File Explorer to perform the rooting first. This is the first android app that allows for the opening and analysis of DNA sequencing files - ab1.
It's safe to download this application. APD Lab is the developer of the app that can be found in the Tools category. On Google Play, DNAApp has been rated 3.8 by its users.
This application was downloaded and installed by over 10K users and its most recent stable release was on Mar 22, 2019. Download the setup package of DNAApp 1.2.6 that is provided for free and have a look at users' reviews on Droid Informer. The app is developed for Android 4.0 and above.