Android Question How Add Custom KEYS to Keyboards

sasetcolombia said:

a new key in the default android keyboard

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You can not change the behaviour of the default keyboard.

You would need to create a App with a Customkeyboard and these Keyboard must be set as the default keyboard to use (systemsetting).
But there is no example of doing that in B4A. At least i do not remember seeing one. So this is where the problems began ;-) You need to find out how to create a Keyboard with B4A (or with java (and a java wrapper)).