Shared Preferences And Onpause Doesn't Work

if i check a checkbox and go on tab without list view with checkbox and came to previous tab, i see checkbox checked previously...but if i click on another tab with list view with

Solution 1:

Your holder in method onPause(MyListFragment) was not instantiated. So when it came to the line

holder.chkBox.setChecked(true);

That exception would come out

Solution 2:

java.lang.NullPointerException means you are trying to use a component that is not initialized.

here, your motive is setChecked/unChecked of checkbox into PlanetAdapter from onPause() callback. You can do in this way:

1. Create an Interface that will communicate between fragment to your adapter.
2. In your onPause callback send command to your adapter for check/uncheck of your checkbox list.

Example: Suppose your interface is like it:

publicinterfaceAdapterCallback {
    voidonCheckboxCallback(boolean isChecked);
}

In your Adapter implements AdapterCallback Interface. Then you will get onCheckboxCallback() method.

@OverridepublicvoidonCheckboxCallback(boolean isChecked) {
//      Do your checkbox check/uncheck here
    }

In this method you can checked/unchecked based on your isChecked value.

Now, in your Fragment/Activity that populating PlanetAdapter, just call this method

if (mCheckBoxValue) {
            plAdapter.onCheckboxCallback(true);


        } else {
            plAdapter.onCheckboxCallback(false);