ClassCastExeption Error when Trying to Get Cell Location Using Telephony Class

Question

I received some Reports on Google Play(from the same User) about CdmaCellLocation :

 java.lang.ClassCastException: android.telephony.cdma.CdmaCellLocation

this is a Service that Report the Approximativ User Location using Cell Network , Please Notice that its 100% Working for me and i had not any other Report about this Bug , Here the Code from the onStart() :

  public class ServiceLocation extends Service{
int myLatitude , myLongitude;
private String str2;    
static SharedPreferences prefs;
private String numtosend;

public int onStartCommand(Intent itn,int num1, int num2){

     prefs = getSharedPreferences("Preferences", 
             Context.MODE_PRIVATE);

        if(isAirplaneModeOn(this)){
            stopSelf();
        }


    Bundle extras = itn.getExtras();

     if(extras.containsKey("ExtraName") != true){
     str2 = itn.getStringExtra("Number");
     }
     location(str2);

     return 0;


   }

Here the location Method Code :

 public void location(String num){
    // TODO Auto-generated method stub



     TelephonyManager telephonyManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
     if(telephonyManager.getSimState() != TelephonyManager.SIM_STATE_ABSENT){
     numtosend = "Phone Number (If Avaible) : " + " " + telephonyManager.getLine1Number() + "  " + " Sim Serial : " + telephonyManager.getSimSerialNumber() + "  " + "IMEI : " + telephonyManager.getDeviceId();
     }
     else {
         numtosend = this.getResources().getString(R.string.txtNoSimCard) + telephonyManager.getDeviceId();
     }
     GsmCellLocation cellLocation = (GsmCellLocation) telephonyManager.getCellLocation();


        int cid = cellLocation.getCid();
        int lac = cellLocation.getLac();

        if(RqsLocation(cid, lac)){




      if(str2.equals("") != true && str2.equals(null) != true) {
      SmsManager.getDefault().sendTextMessage(num, null, this.getResources().getString(R.string.txtGPSPosition) + "(40-250 Meters Accuracy) : "+"http://maps.google.com/?q="+String.valueOf((float)myLatitude/1000000) +","+String.valueOf((float)myLongitude/1000000), null, null);

        }


        if(gmailaccount.equals("") != true && gmailpass.equals(null) != true){



                 P m = new P(gmailaccount , gmailpass);

                             String[] Mail = {mail};
                             m.setTo(Mail);
                             m.setFrom("[email protected]"); 
                             m.setSubject("Location");
                             m.setBody(this.getResources().getString(R.string.txtGPSPosition) + "(~300 Meters Accuracy) : " + "http://maps.google.com/?q="+String.valueOf((float)myLatitude/1000000) +","+String.valueOf((float)myLongitude/1000000) + " " + str2 + "  " + numtosend); 

                             try {
                                if(m.send()){
                                     stopSelf();
                                 }
                                else {

                                     if(str2.equals("") != true) {
                                            SmsManager.getDefault().sendTextMessage(str2, null, "Impossible to Send a Message to your Emergency Mail Address !", null, null);
                                                 }
                                     stopSelf();
                                }
                            } catch (Exception e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            }



    }

        }

      else{
          if(str2.equals("") != true && str2.equals(null) != true) {
            SmsManager.getDefault().sendTextMessage(num, null, this.getResources().getString(R.string.txtInternetOffLocation), null, null);
          }

          if(gmailaccount.equals("") != true && gmailpass.equals(null) != true){
             P m = new P(gmailaccount , gmailpass);

                         String[] Mail = {mail};
                         m.setTo(Mail);
                         m.setFrom("[email protected]"); 
                         m.setSubject("Location");
                                m.setBody(this.getResources().getString("Internet Off)); 

                         try {
                            if(m.send()){
                                 stopSelf();
                             }
                            else {

                                 if(str2.equals("") != true) {

                                             }
                                 stopSelf();
                            }
                        } catch (Exception e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
          }

          }



        stopSelf();

}

And finaly The LogCat From Google Play :

   java.lang.RuntimeException: Unable to start service com.xxx.xxx.xxx.ServiceLocation@4051b930 with Intent {            cmp=com.xxx.xxx.xxx/.ServiceLocation (has extras) }: java.lang.ClassCastException:                 android.telephony.cdma.CdmaCellLocation
   at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2052)
   at android.app.ActivityThread.access$2800(ActivityThread.java:117)
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:994)
   at android.os.Handler.dispatchMessage(Handler.java:99)
   at android.os.Looper.loop(Looper.java:130)
   at android.app.ActivityThread.main(ActivityThread.java:3683)
   at java.lang.reflect.Method.invokeNative(Native Method)
   at java.lang.reflect.Method.invoke(Method.java:507)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:875)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:633)
   at dalvik.system.NativeStart.main(Native Method)
   Caused by: java.lang.ClassCastException: android.telephony.cdma.CdmaCellLocation
   at com.xxx.xxx.xxx.ServiceLocation.location(ServiceLocation.java:83)
   at com.xxx.xxx.xxx.ServiceLocation.onStartCommand(ServiceLocation.java:53)
   at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2039)
  ... 10 more

Do you Think its a Problem with the Phone Provider , or if its come from Tablet ?

[Off-Topic] By the way , where & how can i Report this :

Answer 1

GsmCellLocation cellLocation = (GsmCellLocation) telephonyManager.getCellLocation();

This is an unsafe cast. Your code assumes that this method will always return an instance of GsmCellLocation but that is not the case. There are two types of cellular networks. GSM and CDMA.

If the phone is running on a CDMA network then getCellLocation() will return an instance of CdmaCellLocation.

You can call telephonyManager.getPhoneType() to get information about the type of the radio used by the device. This method will return one of four values:

PHONE_TYPE_NONE - the device doesn't have a cellular radio. It could be a tablet without a 3G modem for instance. getCellLocation() will return null.

PHONE_TYPE_GSM - the device has a GSM radio. You can safely call (GsmCellLocation) telephonyManager.getCellLocation();

PHONE_TYPE_CDMA - the device has a GSM radio. You can safely call (CdmaCellLocation) telephonyManager.getCellLocation();

PHONE_TYPE_SIP - the device is using SIP (Session Initiation Protocol) for communication. getCellLocation() will return null.