Detecting incoming and outgoing calls in Android

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In one of my project, I wanted to detect incoming and outgoing calls. I used BroadcastReceiver with action android.intent.action.NEW_OUTGOING_CALL and android.intent.action.PHONE_STATE.

The android.intent.action.NEW_OUTGOING_CALL will be broadcasted when an outgoing call is initiated. The receiving intent will have an extra string variable Intent.EXTRA_PHONE_NUMBER which contains the outgoing number. This requires the permission android.permission.PROCESS_OUTGOING_CALLS.

To detect the incoming call, we register a BroadcastReceiver for the action android.intent.action.PHONE_STATE. This will be broadcasted when there is a change in phone state. The receiving intent will have an extra string variable TelephonyManager.EXTRA_STATE which describes the phone state. If this state is TelephonyManager.EXTRA_STATE_RINGING then there will be another extra string variable TelephonyManager.EXTRA_INCOMING_NUMBER. This variable contains the incoming phone number. Note that this variable will not be present when the state is not TelephonyManager.EXTRA_STATE_RINGING.

The sample application is a simple one just for demonstration. The application registers for these actions and when the calls are detected it just displays a toast.

5 thoughts on “Detecting incoming and outgoing calls in Android

  1. P C Varma

    I am searching for 2 things
    1. Auto Answer the call, then play a Pre-defined Audio file to the Record the cal-lee voice as Audio file.
    2. Auto Answer the call and play Pre-defined Audio files based on the cal-lee Touch tones/DTMF tones.

    Can you help me? Thanks in Advance.

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