If you are using Fiori Client 1.6.2, or SMP 3.0 SDK SP 11 PL02 please continue reading.
Currently the Fiori Client 1.6.2 in the Google Play Store has a product issue where when the user tries to login to it, Fiori Client hangs. This happens with the Fiori Client from Google Play Store or a Custom Fiori Client built from the Kapsel SDK having a Kapsel version of SP 11 PL02 or higher. SAP has identified this as a product issue and a fix has been implemented. It will be available in the Google Play very soon for the Fiori Client as well the SDK fix will be available in the SAP Service Market Place.