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I started developing android applications. And am testing with the android emulator. Do I really need android phone before releasing it for public usage?
Short answer No. You can test and build a android application package with the SDK and an emulator. But I would say there are usually many things which it would be wise to test on a device.
Personally I have noticed that the emulator does not give a good indication of response times for UI controls. It is usually necessary to move functionality which has long processing times into background threads to maintain user interactivity without the ‘force close’ pop-up. Testing the effectiveness of your UI responsiveness must be done on a phone to be meaningful.
Network connectivity is another aspect which can be vastly different on a phone, 3G or wifi.
Device sizes and Android platform versions can be tested effectively on the emulator.
Some phone allow hot-swapping of the SD card (replacing the SDcard without turning off the phone). I am not sure how to replicate this on the emulator.
There may be many more things which may only become apparent when using your application on a real device. I would strongly suggest to always test under real conditions when feasible for any commercial project.