Android Question playing an MP4 file that resides on the device

[Colin Evans]

Hi, I'm sure this is a simple question but I can't find an answer

I have a number of mp4 files that reside in the folder I believe to be

/storage/emulated/0/Movies or /storage/emulated/legacy/Movies

I just want an interface that I can allow my grandson to press a button and the related video will play, can this be done without having to load the files into the application

 

[Colin Evans]

It's working!, added the new buttons and tidied up the interface and the Grandson is a happy bunny, the SDKversion is set to
<uses-sdk android:minSdkVersion="4" android:targetSdkVersion="26"/>
and given its solely on his tablet and not for anyone else does not using the GetSafeDirDefaultExternal matter