android crash on internet connection turn off

Question

I am new to android, as my study project I made an application. Which is syncing data from webservice and fetching in my application.

Everything working fine.

But in this scenario

Launch the application
Check for internet connection
Get content from server
Fetch data in application

5. When we turn off Mobile Data / WiFi , then press any button in application suddenly application crashes.

There is any way to handle this issue ?

Thanks in advance

Error message

08-14 21:28:57.670: E/AndroidRuntime(7466): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myapp.tvc/com.myapp.tvc.SingleActivity}: java.lang.NullPointerException
08-14 21:28:57.670: E/AndroidRuntime(7466):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
08-14 21:28:57.670: E/AndroidRuntime(7466):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2122)
08-14 21:28:57.670: E/AndroidRuntime(7466):     at android.app.ActivityThread.access$600(ActivityThread.java:140)
08-14 21:28:57.670: E/AndroidRuntime(7466):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1228)
08-14 21:28:57.670: E/AndroidRuntime(7466):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-14 21:28:57.670: E/AndroidRuntime(7466):     at android.os.Looper.loop(Looper.java:137)
08-14 21:28:57.670: E/AndroidRuntime(7466):     at android.app.ActivityThread.main(ActivityThread.java:4895)
08-14 21:28:57.670: E/AndroidRuntime(7466):     at java.lang.reflect.Method.invokeNative(Native Method)
08-14 21:28:57.670: E/AndroidRuntime(7466):     at java.lang.reflect.Method.invoke(Method.java:511)
08-14 21:28:57.670: E/AndroidRuntime(7466):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:994)
08-14 21:28:57.670: E/AndroidRuntime(7466):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:761)
08-14 21:28:57.670: E/AndroidRuntime(7466):     at dalvik.system.NativeStart.main(Native Method)
08-14 21:28:57.670: E/AndroidRuntime(7466): Caused by: java.lang.NullPointerException
08-14 21:28:57.670: E/AndroidRuntime(7466):     at com.myapp.tvc.SingleActivity.onCreate(SingleActivity.java:76)
08-14 21:28:57.670: E/AndroidRuntime(7466):     at android.app.Activity.performCreate(Activity.java:5163)
08-14 21:28:57.670: E/AndroidRuntime(7466):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
08-14 21:28:57.670: E/AndroidRuntime(7466):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2061)
08-14 21:28:57.670: E/AndroidRuntime(7466):     ... 11 more

well whatever is at this line `SingleActivity.java:76` is null. pretty self explanitory — tyczj, Aug 14 '13 at 16:03
Its working fine when Internet connection is on .. please help — ramesh, Aug 14 '13 at 16:12
so figure out what that is and why its null. you have posted no code at all. there is nothing we can do — tyczj, Aug 14 '13 at 16:16
Thanks your advice solved the problem.. add as an answer .. I will accept — ramesh, Aug 14 '13 at 17:10
I would recommend a library for this. Part of AndroidQuery can help! https://code.google.com/p/android-query/#AJAX_Callback — MiStr, Aug 14 '13 at 17:17

score 1 · Accepted Answer · answered Aug 14 '13 at 17:14

1

whatever is at line 76 of SingleActivity is null, since you did not provide code the best we can say is find out what and why is null at that line

answered Aug 14 '13 at 17:14

tyczj

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score 0 · Answer 2 · answered Aug 14 '13 at 15:50

0

My most common error is something is nulll. Maybe the handler is defined inline and your using a variable that is null

answered Aug 14 '13 at 15:50

danny117

5,581
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score 0 · Answer 3 · edited May 23 '17 at 11:55

Based on what you're describing and without seeing your code it sounds like you're just trying to connect to the internet when no internet connection exists. To fix this problem you can create a network checker/listener that can check network availability before you try to do anything that requires an internet connection. If no connection is available you just don't run the task that gets stuff from the server. A more involved set up could be designed using a BroadcastReceiver (e.g. so you know when connectivity becomes available again) but try this for now and see if that's your issue.

android crash on internet connection turn off

3 Answers3