I have an application in which I can select an On or Off value so:
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When I select On and open the keyboard dialer, the dialer gets the first part of a number from my application.
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When I select Off, the dialer acts normally.
Can anyone help me to do this please?
It might be the case that the dialer is back by a ContentProvider. If this is the case and the ContentProvider is accessible, you can try modifying the contents exposed by the ContentProvider.
You can start with looking into the code of the Dialer application on github.