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as far as I know, there is no simple way in Android to generate a beep (equivalent to Console.Beep(int frequency, int length) in .NET). The only one that looked promising – ToneGenerator class, can generate only a limited selection of tones.
Do I have to generate a waveform by hand, push its data to AudioTrack and play it or is there a library or open source code that does it?
Take a look at Playing an arbitrary tone with Android and Generate And Play A Tone In Android.