When you focus a textbox and the keyboard shows up., It resize the layout to fit the keyboard and app on the screen.
So here is a code that if you add to your config.xml before build, will solve this problem.
<edit-config file="AndroidManifest.xml" target="/manifest/application/activity" mode="merge">
<activity android:windowSoftInputMode="adjustNothing" />
</edit-config>[/code:1ie3gb06]
this code will add this line to Android.manifest file:
[code:1ie3gb06]android:windowSoftInputMode="adjustNothing"[/code:1ie3gb06]