Cannot detect when outgoing call is answered in Android

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Since Android 5.0 this is possible for system apps. But you need to use the hidden Android API.

I got it to work like this:

<uses-permission android:name="android.permission.READ_PRECISE_PHONE_STATE" />

<receiver android:name=".listener.OutCallLogger">
    <intent-filter>
        <action android:name="android.intent.action.PRECISE_CALL_STATE" />
    </intent-filter>
</receiver>

public class OutCallLogger extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        switch (intent.getIntExtra(TelephonyManager.EXTRA_FOREGROUND_CALL_STATE, -2) {
            case PreciseCallState.PRECISE_CALL_STATE_IDLE:
                Log.d(This.LOG_TAG, "IDLE");
                break;
            case PreciseCallState.PRECISE_CALL_STATE_DIALING:
                Log.d(This.LOG_TAG, "DIALING");
                break;
            case PreciseCallState.PRECISE_CALL_STATE_ALERTING:
                Log.d(This.LOG_TAG, "ALERTING");
                break;
            case PreciseCallState.PRECISE_CALL_STATE_ACTIVE:
                Log.d(This.LOG_TAG, "ACTIVE");
                break;
        }
    }
}

You can find all possible call states in PreciseCallState.java and all extras that the intent contains in TelephonyRegistry.java.

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