How to get app crash stack after publish

Can you post the stack trace?

Here it is,
but how do I do something inside my app, that will send me full stack

java.lang.RuntimeException: java.lang.NumberFormatException
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:145)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:89)
at anywheresoftware.b4a.gps.GPS$1.onLocationChanged(GPS.java:57)
at android.location.LocationManager$ListenerTransport._handleMessage(LocationManager.java:227)
at android.location.LocationManager$ListenerTransport.access$000(LocationManager.java:160)
at android.location.LocationManager$ListenerTransport$1.handleMessage(LocationManager.java:176)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:3691)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NumberFormatException
at org.apache.harmony.luni.util.FloatingPointParser.parseDblImpl(Native Method)
at org.apache.harmony.luni.util.FloatingPointParser.parseDouble(FloatingPointParser.java:283)
at java.lang.Double.parseDouble(Double.java:318)
at Barrier_Plus.Binyat.servicegps._getdistancekm(servicegps.java:347)
at Barrier_Plus.Binyat.servicegps._gps_locationchanged(servicegps.java:535)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:105)
... 13 more

The user can report this error and you will be able to see the stack trace in the market through your developer console.

This error happened in ServiceGps.GetDistanceKm. You are trying to treat a string as number and this string is not a valid number (can be an empty string maybe).