How I can do that and when exit my app to return to the default on screen keyboard.
The popup soft keyboard comes from the Android OS, we cannot change android system level's soft keyboard.
However, if you use
<Entry> to input characters in your application, we can change input type for all of your
Resources\Styles\Styles.xaml, you can find
<Style TargetType="Entry"> in
Resources\Styles\Styles.xaml, then add following xml.
<Setter Property="Keyboard" Value="Numeric" />
<Entry Keyboard="Numeric"></Entry> for all of
Entrys in your application.
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