Error in creating extension

Open Source Development Extension Development
1

I am new to create extension I want to create a file picker extension and I try to make but I got error see my code please help me

IMG_20210510_104037
IMG_20210510_104037994×1182 179 KB

2

I guess file chooser extensions use intents, (not sure)

3

Yes.

But here you will have to implement ActivityResultListener to get callback.
For example:

4

Woow, completely different from what he did