Question

Possible Duplicate:
Stopping & Starting music on incoming calls

I have a simple application that plays some audio using the MediaPlayer class. While debugging my application I found that the audio still plays during incoming and outgoing calls.

I found that the solution to my problem is using a phoneStateListener. I don’t quite understand how to do this though. I saw some examples that used a BroadcastReceiver along with the PhoneStateListener and I couldn’t understand why we needed a BroadCastReceiver.

I would appreciate it if someone could provide a sample implementation of the PhoneStateListener. If I can get the phone state I could pause or resume the audio because my MediaPlayer object is global for the entire application.

Answer 1

This is what I use…
The onCallStateChanged() function gets called in all PhoneStateListeners anytime the call state has changed, so that’s what you need to handle.

import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;

//Makes sure the audio is paused for incoming/outgoing phone calls
public class ListenToPhoneState extends PhoneStateListener {

    private boolean pausedForPhoneCall = false;
    private UIManager uiManager;

    ListenToPhoneState(UIManager manager){
        uiManager = manager;
    }

    @Override
    public void onCallStateChanged(int state, String incomingNumber) {

        switch (state) {
            case TelephonyManager.CALL_STATE_IDLE:
                resumeInAndroid();
                return;
            case TelephonyManager.CALL_STATE_OFFHOOK: 
                pauseInAndroid();               
                return;
            case TelephonyManager.CALL_STATE_RINGING: 
                pauseInAndroid();               
                return;
        }
    }

    private void resumeInAndroid(){
        if(pausedForPhoneCall == true) {
            pausedForPhoneCall=false;
            uiManager.waitForPhoneCall(false);
        }
    }

    private void pauseInAndroid(){
        if(pausedForPhoneCall == false){
            pausedForPhoneCall=true;
            uiManager.waitForPhoneCall(true);
        }
    }

    String stateName(int state) {
        switch (state) {
            case TelephonyManager.CALL_STATE_IDLE: return "Idle";
            case TelephonyManager.CALL_STATE_OFFHOOK: return "Off hook";
            case TelephonyManager.CALL_STATE_RINGING: return "Ringing";
        }
        return Integer.toString(state);
    }
}

If you want to add this to your current Activity, do this..

ListenToPhoneState listener = new ListenToPhoneState(userInterface);
        TelephonyManager tManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
        if(tManager != null)
            tManager.listen(listener, PhoneStateListener.LISTEN_CALL_STATE);

Wouldn’t you rather just pause your current activity? If you pass your class an instance of the current activity, you could call finish() and create a new activity right in the switch statement if you really want to.