android - 尝试使用电话类获取单元格位置时出现 ClassCastExeption 错误

Question

我在 Google Play 上收到了一些关于 CdmaCellLocation 的报告(来自同一用户):

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

这是一项使用蜂窝网络报告近似用户位置的服务，请注意它 100% 为我工作，我没有关于此错误的任何其他报告，这里是 onStart() 的代码:

  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;


   }

这里是位置方法代码:

 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("AnonymousMail@gmail.com"); 
                             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("AnonymousMail@gmail.com"); 
                         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();

}

最后是来自 Google Play 的 LogCat:

   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

您认为这是电话供应商的问题，还是来自平板电脑？

[题外话] 顺便说一句，我在哪里以及如何举报:

Answer 1

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

这是一个不安全的转换。您的代码假定此方法将始终返回 GsmCellLocation 的实例，但事实并非如此。有两种类型的蜂窝网络。 GSM 和 CDMA。

如果手机在 CDMA 网络上运行，则 getCellLocation() 将返回 CdmaCellLocation 的实例。

您可以调用 telephonyManager.getPhoneType() 来获取有关设备使用的 radio 类型的信息。此方法将返回四个值之一:

PHONE_TYPE_NONE - 该设备没有蜂窝 radio 。例如，它可以是没有 3G 调制解调器的平板电脑。 getCellLocation() 将返回 null。

PHONE_TYPE_GSM - 设备有 GSM radio 。您可以安全地调用 (GsmCellLocation) telephonyManager.getCellLocation();

PHONE_TYPE_CDMA - 设备有 GSM radio 。您可以安全地调用 (CdmaCellLocation) telephonyManager.getCellLocation();

PHONE_TYPE_SIP - 设备使用 SIP(​​ session 发起协议(protocol))进行通信。 getCellLocation() 将返回 null。