I am developing an app which support Google Map tiles osmdroid. It is possible to use Google map tiles with osmdroid?
Indeed, there are restrictions in Terms of Service.
https://developers.google.com/maps/terms#10-license-restrictions
Have a look at paragraph 10.4 d,e.
No use of Content without a Google map. Unless the Maps APIs Documentation expressly permits you to do so, you will not use the Content in a Maps API Implementation without a corresponding Google map. For example, you may display Street View imagery without a corresponding Google map because the Maps APIs Documentation expressly permits this use.
No use of Content with a non-Google map. You must not use the Content in a Maps API Implementation that contains a non-Google map