Among one of many reasons to target the Android platform, first and foremost is cost. On average you can get an Android smartphone for a fraction of the cost of an iPhone. They may not have commensurate features, but thrift is a major component for new smartphone buyers. Next is flexibility. Developers can often find on cheap and imported Android devices a version of Google Play that is maintained by the manufacturer. Developers should develop as if they expect their app to be available to all Android devices.
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