Problem with Android SDK..?

Hello, I am new to unity. One month back I was using unity 4.0 . In 4. unity I was using android SDK version 18. Recently I updated unity to 4.3 but with same SDK. When I am exporting my game from unity to android it was asking to update SDK. So, I uninstalled old SDK and installed SDK version 22.3 with API 19 installed. Now I am able to export game from unity to android mobile. But, the application installs but not opening in mobile...? just a black screen for 2 secnds and quitting....? Can anybody please help me with this.. I am very thankful..!