Ferdinand questions

• Passing data from New activity to old activity?
• How to set style(small and large) to Button programmable way?
• Make SHA1 encryption on Android?
• How to link paid app user account to the system?
• Billing-in-app error
• How to draw filled polygons?
• How to create Http Connection using AsyncTask class?
• Testing in-app-billing
• How to rotate the screen to landscape (or portrait) by programmable way?
• How to rotate MapView?

Ferdinand answers