Android: Incoming call auto answer, play a audio file

Question

In Android, at the time of an incoming call, I want to receive it. Then, from my app, automatically play an audio file during a call and the other party should hear it. Is this

Answer 1

In android there is no option to play against a live call or switch audio source to something other then default Mic! here are details that why you can't play recordings during a live call

However there are some tricks,

1. You can play desired recording from mobile speaker, during a call ! an Mic will pick it from there?
2. Or you can interconnect a handfree Speaker wires to its Mic wire
3. Or use bluetooh from some other device to play desired recording

Answer 2

What you are talking about is not exactly possible with android. Android has no access to the in-call audio stream.

Though i can give you a little bit idea about how to do it.

first to intercept incoming call, you need to register a broadcast receiver, which is invoked whenever call is received

public void onReceive(final Context context, Intent intent) 
{
    TelephonyManager telephonyManager = null;
    PhoneStateListener listener = new PhoneStateListener() 
    {
        public void onCallStateChanged(int state, String incomingNumber) 
        {
            switch (state) 
            {
            case TelephonyManager.CALL_STATE_IDLE:
                Toast.makeText(context, "Call Ended..", Toast.LENGTH_LONG).show();
                Log.i("stop", "Call Ended....");
                break;
            case TelephonyManager.CALL_STATE_OFFHOOK:
                Toast.makeText(context, "Call Picked..", Toast.LENGTH_LONG) .show();
                Log.i("received", "Call Picked....");
                break;
            case TelephonyManager.CALL_STATE_RINGING:
                Toast.makeText(context, "Call Ringing.." + incomingNumber,5000).show();
                break;
            }
        }
    };
    // Register the listener with the telephony manager
    telephonyManager.listen(listener, PhoneStateListener.LISTEN_CALL_STATE);

Also change your manifest,

<uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <receiver android:name="MyReceiver">

            <intent-filter>

                <action android:name="android.intent.action.NEW_OUTGOING_CALL" />



            </intent-filter>
        </receiver>
    </application>

With this, you can intercept the incoming call and pick the call, now you can try playing some mp3 file in the

case TelephonyManager.CALL_STATE_OFFHOOK:
                // Play mp3 file here
                break;

Hope it helps. Must try this and tell me the experience.

Answer 3

Try using telephonymanager, it contains the events you are looking for:

1. http://developer.android.com/reference/android/telephony/TelephonyManager.html#ACTION_PHONE_STATE_CHANGED

Answer 4

You cannot play anything to the caller directly. If you want you'd play via loudspeaker, but that's not really what you want. So "no", you cannot do that.