Android mobile app - reusable Class.
Provide source code for a fully functioning reusable Class that accepts a string as input parameter and generates in-band DTMF on an existing telephone call.
Class must evaluate input parameter for valid dial string characters to include 0-9, comma, semi-colon, #, *, letters translated as numbers based on US telephone button label standard ( ABC = 2, DEF = 3, etc.).
Class must evaluate whether there is an active telephone call. If so, Class must cause in band DTMF based on input parameter.
Class must gracefully handle case where there is one or more call on hold and no active call.
Class must gracefully handle case where there is an active call.
Class must gracefully handle case where there is one or more call on hold and an active call.
Class must cause in-band DTMF on an active call.
Class must return a success/failure code as string. "success", "no active call", "unknown failure".
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What you're asking for is not feasible right now in Android. But I made an application that can maybe be use as a workaround. I can show you this and then we'll see if you're interested or not.