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POSome GSM devices crashing with CDMA SignalStrength error on Android
 

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    <p>My Android app monitors cellular signal strengths. On CDMA devices, it works without any problems. On <em>many</em> GSM devices, it works without any problems. However, on <em>some</em> GSM devices, I am getting force closes with the following error message:</p> <p><strong>java.lang.ClassCastException: android.telephony.cdma.CdmaCellLocation cannot be cast to android.telephony.gsm.GsmCellLocation</strong></p> <p>I am fairly certain that this issue occurs on some Samsung devices in the US when they receive a 4G LTE signal; I believe it occurs on other devices and countries as well. I am still trying to determine the exact service providers and devices involved.</p> <p>Here is the relevant snippet of code from MyService.java; I have marked the line referenced by the error message with <code>//********</code>:</p> <pre><code>public void onCreate() { tm = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE); ... } public int onStartCommand(Intent in, int flags, int startId) { signalStrengthListener = new SignalStrengthListener(); ((TelephonyManager)getSystemService(TELEPHONY_SERVICE)).listen(signalStrengthListener, SignalStrengthListener.LISTEN_SIGNAL_STRENGTHS | SignalStrengthListener.LISTEN_SERVICE_STATE | SignalStrengthListener.LISTEN_DATA_CONNECTION_STATE | SignalStrengthListener.LISTEN_CELL_LOCATION); return START_STICKY; ... } public void onSignalStrengthsChanged(SignalStrength signalStrength) { isGSM = signalStrength.isGsm(); if (isGSM == true) { GCellLoc = (GsmCellLocation)tm.getCellLocation(); //******** ... } </code></pre> <p>Not sure why is anything from <code>android.telephony.cdma</code> is appearing if this code should only be triggered when <code>isGSM</code> returns true. Perhaps when an LTE signal is detected, that puts the phone in some sort of dual CDMA/GSM mode as far as the Android API is concerned? I have not been able to find any documentation of similar behavior. How can I handle this in my code? Thanks.</p>
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    1. COYou need to dig deep into the Android source for the `telephony` to find out how to determine which is which, i.e. CDMA, GSM, EVO ... and handle the case appropriately...
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