Android: prevent preference dialog for preference which must be loaded over the network

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My app has a ListPreference, whose entries come from a network API. In my PreferenceActivity's onCreate(), I spawn a background thread which makes the API call and then populates the entries of the ListPreference after one or two seconds.

If the user clicks the ListPreference button on the preference screen before the options have been downloaded, I want to prevent the preference dialog from showing and instead notify the user that the list of options is still being loaded.

I suspect that correct approach is to override the OnPreferenceClickListener, like this:

ListPreference dpref = (ListPreference) findPreference("debug");
String[] s = {"one", "two", "three"};
dpref.setEntries(s);
dpref.setEntryValues(s);
dpref.setOnPreferenceClickListener(new OnPreferenceClickListener() {
    @Override
    public boolean onPreferenceClick(Preference preference) {
        Toast.makeText(this, "hi there", Toast.LENGTH_SHORT).show();
        return true;
    }
});

The toast gets shown, but the ListPreference chooser dialog is shown as well. The OnPreferenceClickListener documentation says that onPreferenceClick should return true if the click was handled, but returning false has the same result.

How do I prevent the preference dialog from showing?

Is there a better way to handle preferences whose options must be downloaded before viewing?

I'm not sure why your way is not working, but here is a quick workaround solution:

Add stub Preference for each preference that should be downloaded. You can customize you action on click in any way you want. No dialogs will be shown.

When your preference options are ready, remove old Preference (by its name) and create new ListPreference (with the same name as just removed one) with your options.

This will give you a flexibility to add any kind of custom preferences on any event you need. Though as you can see, some extra coding is required.

prevent preference dialog for preference which must be , Android: prevent preference dialog for preference which must be loaded over the My app has a ListPreference, whose entries come from a network API. -must loaded on the ui thread-execute() must be called on the ui thread-do not call any of the four operational methods directly-only execute a task once

I was struggeling with the same problem but in a more simple environment. My PreferenceScreen is defined in an xml file. There is one Preference I want to handle myself. So I simply put a "Preference" object into the xml file instead of a "ListPreference" or "EditTextPreference"

    <Preference android:title="@string/preloadmaps1" android:summary="@string/preloadmaps2"
        android:key="preloadMaps" />

Now there is no more Editor connetcted with the Preference and I can savely handle the editing myself in "OnPreferenceClickListener"

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Reference the android dveloper document which about showDialog :

Shows the dialog associated with this Preference. This is normally initiated automatically on clicking on the preference. Call this method if you need to show the dialog on some other event.

So, when click preference will call showDialog() automatically, if you want to control to prevent to show a dialog on click preference, you need to implement a custom preference, like this,

public class MyPreference extends ListPreference {
    private Context context;

    // a flag to control show dialog
    private boolean showDialog = false;

    public MyPreference(Context context) {
        super(context);
        this.context = context;
    }

    public MyPreference(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.context = context;       
    }

    @Override
    protected void showDialog(Bundle state) {        
        if (showDialog) {
            // show dialog 
            super.showDialog(state);
        } else {
            // if you don't want to show a dialog when click preference
            return;
        } /* end of if */
    }
}

user preferences or settings, Use the AndroidX Preference Library for consistent behavior across all Called when the dialog is dismissed and should be used to save data  Then select the object file. Method 2: Select the file for loading and drag the file to the main interface of the software. Method 3: Click [File]--[Load File]. Then select the object file for loading. Method 4: Click [File]--[Examples] to load the example files Method 5: Click [File]--[Recent Files] to load the files opened recently.

I know this is an old question, but there's still no answer how to cancel those dialog. So here's how you can cancel preference dialog:

dpref.setOnPreferenceClickListener(new OnPreferenceClickListener() {
    @Override
    public boolean onPreferenceClick(Preference preference) {
        ((ListPreference)preference).getDialog().dismiss();   <<< This will do it
        Toast.makeText(this, "hi there", Toast.LENGTH_SHORT).show();
        return true;
    }
});

But instead of dismissing the dialog, its better to hide it to be able to show it later, when a list of options is loaded from web. So do:

dpref.setOnPreferenceClickListener(new OnPreferenceClickListener() {
    @Override
    public boolean onPreferenceClick(Preference preference) {
        ((ListPreference)preference).getDialog().hide();   <<< This will just hide the dialog and you still can show it later
        Toast.makeText(this, "hi there", Toast.LENGTH_SHORT).show();
        return true;
    }
});

Later on, when list of options is loaded do:

...
dpref.setEntries(<array_of_options_here>);
dpref.getdialog().show();  <<< If you dismiss the dialog earlier and not hide it, then getDialog() returns null here 
...

Preference components and attributes, Dialogs · Menus Note: This guide explains how to use the AndroidX Preference library. theme that provides a consistent user experience across devices and OS A Preference is the basic building block of the Preference Library. Caution: The root tag must be a <PreferenceScreen> , and the XML  If support for dynamically loaded modules was enabled when configuring slapd, cn=module entries may be used to specify sets of modules to load. Module entries must have the olcModuleList objectClass. 5.2.2.1. olcModuleLoad: <filename> Specify the name of a dynamically loadable module to load.

I'd use a proxy Activity (styled as a dialog) that downloads preferences and launches the actual PreferenceActivity once done.

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Comments
  • This is what I ended up doing. Thanks!
  • I had to do the same. Did you find a way to put the new Preference in the position of the removed PreferenceScreen (in my case) instead of adding it at the end of the list?
  • I found the answer myself: I set the container's OrderingAsAdded to false and during replacing the preferences I set every Preference's Order according to its current position in the list, so I just have to assign the same order to the new stub Preference.
  • This didn't quite work for me, at least with a ListPreference on Android 4.1. I was able to suppress the list dialog with: if (showDialog) { super.showDialog(state); } else { getDialog().dismiss(); }
  • Works great, thanks! I've added the following guard just to be safe: Dialog dialog = listPreference.getDialog(); if (dialog != null) { dialog.dismiss(); }