Most Android apps are developed using Java. You can develop Android apps in c# by using Mono for Android. Be aware that you will need to ship the Mono for Android runtime as part of your app. If you plan to also develop for iPhones, this may be a good option as iPhones use C# for application development by default.

Since you are new to programming though, if you want to make only an Android app, it would be advisable to use Java instead.
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