Fullscreen button when playing video with webview (+playing youtube vids)

[Daebyeognoh]

When I try playing youtube videos using webview, I don't see a fullscreen button

There's only a volume and caption button.

I thought this was a problem of app inventor in general, 

but I saw other people's screenshots that has a fullscreen button.

Does anyone know why my app doesn't have a fullscreen button?

Also, the only way that I know to correctly play youtube videos with webview is to add 

"<uses-sdk android:targetSdkVersion="14" />"

this line to the AnderoidManifest.xml file.

This does work, but are there any other ways to play videos on webview?

[TimAI2]

For fullscreen, see here

Only way at the moment is to edit the manifest file,as far as I know.