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POHow to interpret Debugging information?
 

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  1. POHow to interpret Debugging information?
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    <p>This is actually two questions. The first relates to my program, and the second is a more general question regarding debugging.</p> <p>In my code, I have two button listeners. When the first is clicked, the onClickListener creates the locationlistener, as well as the LocationManager which requests updates from the locationlistener. (See below...) </p> <pre><code>LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationlistener); </code></pre> <p>On the click of the second button, I try to unregister the listener as follows... </p> <p>locationManager.removeUpdates(locationlistener);</p> <p>However, I end up with a force close and the following info in the debugger...</p> <pre><code>ERROR/AndroidRuntime(310): FATAL EXCEPTION: main ERROR/AndroidRuntime(310): java.lang.NullPointerException ERROR/AndroidRuntime(310): at com.ryan.gcal.GRunCal$2.onClick(GRunCal.java:94) ERROR/AndroidRuntime(310): at android.view.View.performClick(View.java:2408) ERROR/AndroidRuntime(310): at android.view.View$PerformClick.run(View.java:8816) ERROR/AndroidRuntime(310): at android.os.Handler.handleCallback(Handler.java:587) ERROR/AndroidRuntime(310): at android.os.Handler.dispatchMessage(Handler.java:92) ERROR/AndroidRuntime(310): at android.os.Looper.loop(Looper.java:123) ERROR/AndroidRuntime(310): at android.app.ActivityThread.main(ActivityThread.java:4627) ERROR/AndroidRuntime(310): at java.lang.reflect.Method.invokeNative(Native Method) ERROR/AndroidRuntime(310): at java.lang.reflect.Method.invoke(Method.java:521) ERROR/AndroidRuntime(310): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) ERROR/AndroidRuntime(310): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) ERROR/AndroidRuntime(310): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>Line 94 of my code, where the error originates, is where I tried to remove the location listener. So I assume I am not removing the location listener properly, but I am not sure what is wrong. My LocationManager is declared at the start of my code...</p> <pre><code>Locationmanager locationManager; </code></pre> <p>My first question is, what am I doing wrong in removing the listener? And secondly, can anyone provide some tips/advice on learning to interpret debug errors meaningfully? Thanks.</p>
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    1. COhow did you declare `locationlistener`?
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    2. COI've updated the question to include my declaration of locationlistener
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      1. USRyan
    3. COYou need to show more detail, for example how you instantiate your locaionListener. It also looks like your formatting is messed up. Happened to me the other day, you need to cut the message into notepad, edit it and replace the whole question.
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