*Here is my code*
[Activity]
public class MainActivity : BaseRuattiActivity, ILocationListener
{
private LocationManager _lm;
private bool _gpsEnabled;
private bool _networkEnabled;
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
SetContentView(Resource.Layout.MainView);
_lm = LocationManager.FromContext(this);
_gpsEnabled = _lm.IsProviderEnabled(LocationManager.GpsProvider);
_networkEnabled =
_lm.IsProviderEnabled(LocationManager.NetworkProvider);
}
protected override void OnResume()
{
base.OnResume();
if (_lm != null)
{
if (_gpsEnabled) _lm.RequestLocationUpdates(LocationManager.GpsProvider,
0, 0, this, MainLooper);
if (_networkEnabled)
_lm.RequestLocationUpdates(LocationManager.NetworkProvider, 0, 0, this,
MainLooper);
}
}
protected override void OnPause()
{
if (_lm != null)
{
try
{
_lm.RemoveUpdates(this);
}
finally
{
_lm.Dispose();
_lm = null;
}
}
base.OnPause();
}
The problem is that periodically system throws Null Reference exception in
OnPause method in try block and that killing my app.
E/mono ( 4534): Unhandled Exception: System.NullReferenceException:
Object reference not set to an instance of an object
E/mono ( 4534): at (wrapper delegate-invoke)
<Module>:invoke_void__this___intptr_intptr_intptr_JValue[]
(intptr,intptr,intptr,Android.Runtime.JValue[])
E/mono ( 4534): at Android.Runtime.JNIEnv.CallVoidMethod (IntPtr
jobject, IntPtr jmethod, Android.Runtime.JValue[] parms) [0x00000] in
<filename unknown>:0
E/mono ( 4534): at Android.Locations.LocationManager.RemoveUpdates
(ILocationListener listener) [0x00000] in <filename unknown>:0
E/mono ( 4534): at Ruatti.Gui.Modules.Main.MainActivity.OnPause ()
[0x00000] in <filename unknown>:0
E/mono ( 4534): at Android.App.Activity.n_OnPause (IntPtr jnienv,
IntPtr native__this) [0x00000] in <filename unknown>:0
E/mono ( 4534): at (wrapper dynamic-method)
object:e2437ed3-b5af-4d31-92a6-2ac61f5156ae (intptr,intptr)
D/dalvikvm( 4534): threadid=1: thread exiting, not yet detached (count=0)
E/dalvikvm( 4534): ERROR: detaching thread with interp frames (count=17)
I/dalvikvm( 4534): "main" prio=5 tid=1 RUNNABLE
I/dalvikvm( 4534): | group="main" sCount=0 dsCount=0 s=N obj=0x400208c0
self=0xcd40
I/dalvikvm( 4534): | sysTid=4534 nice=0 sched=0/0 cgrp=default
handle=-1345017784
I/dalvikvm( 4534): at
ruatti.gui.modules.main.MainActivity.n_onPause(Native Method)
I/dalvikvm( 4534): at
ruatti.gui.modules.main.MainActivity.onPause(MainActivity.java:61)
I/dalvikvm( 4534): at
android.app.Activity.performPause(Activity.java:3859)
I/dalvikvm( 4534): at
android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1190)
I/dalvikvm( 4534): at
android.app.ActivityThread.performPauseActivity(ActivityThread.java:3425)
I/dalvikvm( 4534): at
android.app.ActivityThread.performPauseActivity(ActivityThread.java:3395)
I/dalvikvm( 4534): at
android.app.ActivityThread.handlePauseActivity(ActivityThread.java:3378)
I/dalvikvm( 4534): at
android.app.ActivityThread.access$2700(ActivityThread.java:129)
I/dalvikvm( 4534): at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:2124)
I/dalvikvm( 4534): at android.os.Handler.dispatchMessage(Handler.java:99)
I/dalvikvm( 4534): at android.os.Looper.loop(Looper.java:143)
I/dalvikvm( 4534): at
android.app.ActivityThread.main(ActivityThread.java:4717)
I/dalvikvm( 4534): at java.lang.reflect.Method.invokeNative(Native Method)
I/dalvikvm( 4534): at java.lang.reflect.Method.invoke(Method.java:521)
I/dalvikvm( 4534): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
I/dalvikvm( 4534): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
I/dalvikvm( 4534): at dalvik.system.NativeStart.main(Native Method)
--
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