There's also Android and Android, you need also to test for each popular product of Samsung since it's so different from stock and then hope there is no carrier

There's also Android and Android, you need also to test for each popular product of Samsung since it's so different from stock and then hope there is no carrier-specific problem. And you also need test with a lot of different screens, but it's not like in web, you can't resize the emulator like this so it takes longer. Not trying to criticize, but it's still not easy to get an Android app to work mostly everywhere.