We are about to switch to a new forum software. Until then we have removed the registration on this forum.
a) look here https://developer.android.com/reference/android/provider/MediaStore.html
b) then here https://developer.android.com/training/basics/intents/result.html
so, basically, you startActivityFor Result() with an intent of the category (images)::
Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
write a callback method like in the example above:: onActivityResult(..........)
here you can get the path to the image
and (i hope!) can load it with loadImage()...