problems with onCellLocationChanged

Question

I need to start service when my device change cell connection and I presume to do that with onCellLocationChanged() implements below but the beeps start only if I receive incoming calls...

my listener:

public class CellLocationListener extends PhoneStateListener {

    @Override
    public void onCellLocationChanged(CellLocation location) {
        super.onCellLocationChanged(location);

        int cid = 0;
        int lac = 0;

        if (location != null) {
            if (location instanceof GsmCellLocation) {
                cid = ((GsmCellLocation) location).getCid();
                lac = ((GsmCellLocation) location).getLac();
            }
            else if (location instanceof CdmaCellLocation) {
                cid = ((CdmaCellLocation) location).getBaseStationId();
                lac = ((CdmaCellLocation) location).getSystemId();
            }
        }

        String cellInfo = Integer.toString(lac)+"-"+Integer.toString(cid);

        Log.v("logg","CELL CHANGED:"+cellInfo);
    }
}

I've used the same cellInfo on mainactivity and when I start it cellInfo chages its value but no beeps from broadcas receiver....

on manifest:

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_UPDATES" />

<receiver android:name="dado.auto3gdataswitch.CellChangeReceiver">
    <intent-filter>
        <action android:name="android.intent.action.PHONE_STATE" />
    </intent-filter>
</receiver>

my broadcastReceiver

  public class CellChangeReceiver extends BroadcastReceiver {

     TelephonyManager telephony;

     public void onReceive(Context context, Intent intent) {
        CellLocationListener phoneListener = new CellLocationListener();
        telephony = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
        telephony.listen(phoneListener, CellLocationListener.LISTEN_CALL_STATE);

        Toast.makeText(context, "ON receiver", Toast.LENGTH_LONG).show();

        final MediaPlayer mp = MediaPlayer.create(context, R.raw.beep); 
        mp.start();
        mp.setOnCompletionListener(new OnCompletionListener() {

            @Override
            public void onCompletion(MediaPlayer mp) {      
                mp.stop();
                mp.release();
            }
        });

        Log.v("logg","onreceiver");

    }
}

I hear a beep only if I receive incoming call and not if I change cell....

What's wrong??

Answer 1

I've foud a better solution!!!

in my mainActivity:

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    final TelephonyManager telm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);

    int events = PhoneStateListener.LISTEN_CELL_LOCATION;
    telm.listen(phoneStateListener, events);

.....
}

private final PhoneStateListener phoneStateListener = new PhoneStateListener() {

    @Override
    public void onCellLocationChanged(CellLocation location) {
        super.onCellLocationChanged(location);

        int cid = 0;
        int lac = 0;

        if (location != null) {
            if (location instanceof GsmCellLocation) {
                cid = ((GsmCellLocation) location).getCid();
                lac = ((GsmCellLocation) location).getLac();
            }
            else if (location instanceof CdmaCellLocation) {
                cid = ((CdmaCellLocation) location).getBaseStationId();
                lac = ((CdmaCellLocation) location).getSystemId();
            }
        }

        String cellBase = Integer.toString(lac)+"-"+Integer.toString(cid);

        Toast.makeText(getBaseContext(), cellBase, Toast.LENGTH_LONG).show();
        Log.v("logg", "cell:"+cellBase);

        final MediaPlayer mp = MediaPlayer.create(getBaseContext(), R.raw.beep);    
        mp.start();
        mp.setOnCompletionListener(new OnCompletionListener() {

            @Override
            public void onCompletion(MediaPlayer mp) {

                mp.stop();
                mp.release();
            }
        });
    }       
};

Answer 2

You are listening to CellLocationListener.LISTEN_CALL_STATE, but you should listen for CellLocationListener.LISTEN_CELL_LOCATION. And if you want the sound to be played on cell change, you should move the corresponding code to the onCellLocationChanged. And your cell change listener will be registered only when android.intent.action.PHONE_STATE will be received.