How to pick any file and visualising it/reproduzing it in a webview?

i want to create a kind of gallery and being able to pick any file from my phone and visualising it in another page when i click in the file selected. also, the files choosen must be saved, so, when i enter the app another time, the files i have choosen before is still there

I´m not sure what your question is? I have put a few comments together if you are planning your first app. Have a read and also make sure you complete the tutorials.