Android : How can I integrate voice recorder to my android application?

I am working on android project nowadays but I have a problem about voice recording.I want to add voice recording feature to my project with buttons .I did some researches on Google and here but I only find "creating voice recorder app".I actually,don't want this type.How can I do that ?

I tried the app version but I got some errors in mainactivity class and I couldn't get any solution for them.