Preference cannot cast java.lang.boolean to String

Question

I have the following Preference class:

public class AppPreferencesActivity extends PreferenceActivity {
    private SharedPreferences appPrefs;
    private S         


        

Answer 1

I was getting the same error. I went and deleted App's data and my app doesn't crash anymore.

Answer 2

I was getting this error too, and couldn't figure out why. I think it's because I added a new preference and tried running the app again. I uninstalled the app, then ran it again with the new preferences, and it worked. Maybe it needed a full wipe to reset the sharedpreferences file.

Answer 3

I had this error too. It happined when i first had a checkbox preference, then used the same name for a list preference, but on my phone in the preferences it was still saved as a boolean and it tried to load that into my list.

fix: clear app data

Answer 4

It obviously that some prefs are checked and only return boolean value. So you cannot use this directly.

for (Entry<String, ?> key : appPrefs.getAll().entrySet()) {
    findPreference(key.getKey()).setSummary(appPrefs.getString(key.getKey(), "Not yet entered"));
}

I think maybe you should use like that:

for (Entry<String, ?> key : appPrefs.getAll().entrySet()) {
    Object result = key.getValue();
    if (result instanceof Boolean) {
        //handle boolean
    } else if (result instanceof String) {
        //handle String
    }
    findPreference(key.getKey()).setSummary(result);
}