Add "subkeyboard" associated to key?

[Android Central Question]

I'm trying to create a custom Android Keyboard, just trying to learn the process.

My question is, how can I achieve this effect from the usual keyboard in which I keep a key pressed and a list of more options will pop up?

E.g. when I click on "a", and keep pressing it, I would get a submenu that would show "á", "à", "ä", &c...

How can I do that? As of now I only have the basic xml layout:
<Row>
<Key android:keyLabel = "a"/>
</Row>

Any help is appreciated.

 

[B. Diddy]

Welcome to Android Central! I moved this to the Software Development forum for more specific traffic.

Please register on this forum, which will allow you to engage in discussion more easily, as well as post images. https://forums.androidcentral.com/ask-question/409154-join-android-central-community.html