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App works fine in android 2.3.7 and not in 4.1.2

I have an app that works fine in android 2.3.4, 2.3.6 and 2.3.7 but it doesn´t in android 4.1.2 or 4.2.2 (I have no more devices)

The app calls to a jar file that returns a result, when I test the app in 2.3.7 I make the call to the jar and takes the result but when I do it with android 4.1.2 it forces the close. It´s quite weird because the only difference is the OS because the app is the same.

The jar file makes a call to internet, I don´t think this could be the mistake

Thanks again everybody!

Solution

  • The jar file makes a call to internet, I don´t think this could be the mistake

    => Sorry dude problem is here, as you said your app is working fine in < 2.3 versions but not in >2.3, reasons behind this failure is NetworkOnMainThreadException.

    Now, Why this exception is being raised whenever you run app in >2.3 version device?

    => NetworkOnMainThreadException occurs whenever an application attempts to perform a networking operation on its main thread.

    Solutions:

    Below are the two solutions to resolve this issue:

    1) Standard way is to make webservice call by implementing AsyncTask.

    2) The lazy way of handling this is to turn the check of:

    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);