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Calling handler.removeCallbacks from onDeleted method in a widget throws a nullpointerexception


Calling handler.removeCallbacks from onDeleted method in a widget throws a nullpointerexception

By : user2954308
Date : November 22 2020, 01:01 AM
To fix this issue The problem is that you can't depend on the same instance of your widget being called by Android each time, and so keeping non-static fields in your widget provider is a problem.
An easy solution would be to use static fields for handler and runnable. It looks like some of the other fields could go away too, for example PieGraph is constructed each time onProgressUpdate is called, so it could be a local. Basically you should avoid all non-static fields in a widget.
code :


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Calling fragment method throws NullPointerException

Calling fragment method throws NullPointerException


By : manitee
Date : March 29 2020, 07:55 AM
wish helps you It was an issue with the replace fragment transaction.
I did not use componentsFragment as describe above in this transaction, but a newly created one.
code :
    ComponentsFragment fragment = new CommponentsFragment();

    FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();

    // Replace whatever is in the fragment_container view with this fragment,
    // and add the transaction to the back stack so the user can navigate back
    transaction.replace(R.id.fragment_container, fragment);
    transaction.addToBackStack(null); // Commit the transaction
    transaction.commit();
transaction.replace(R.id.fragment_container, fragment);
transaction.replace(R.id.fragment_container, componentsFragment);
ComponentsFragment fragment = new CommponentsFragment();
How to start handler again after calling removeCallbacks or removeCallbacksAndMessages on handler in android

How to start handler again after calling removeCallbacks or removeCallbacksAndMessages on handler in android


By : Thiago Correia
Date : March 29 2020, 07:55 AM
like below fixes the issue I am working on an android app and have a Fragment in which I send an API request each 60 seconds. I am using a Handler in this Fragment to perform this work in the following manner : , You could override onResume as well and restart your Handler there:
code :
@Override
protected void onResume() {
    super.onResume();
    handler.post(runnableCode);
}
handler.removeCallbacks(runnable) does not stop the handler when call

handler.removeCallbacks(runnable) does not stop the handler when call


By : Roman Drápela
Date : March 29 2020, 07:55 AM
I wish this helpful for you It seems the expected behavior since you are calling removeCallback from latAndLong method but you call again postDelayed in the run. Return a boolean value from latAndLong method and decide if you need to call postDelayed again or not in the Run method.
hibernate throws NullPointerException when calling query.list method

hibernate throws NullPointerException when calling query.list method


By : Shannen
Date : March 29 2020, 07:55 AM
wish helps you Problem solved. Apparently the latest version of hibernate does not support month() and year() functions, so I will have to select the required data in java from the list of all data taken from the database, or use a different query.
Calling method from main throws NullPointerException

Calling method from main throws NullPointerException


By : hacker_dream
Date : March 29 2020, 07:55 AM
With these it helps you call mega.ss(ff) but ff has never been initialited with somthing like:
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