Try subclassing EditTextPreference
and overriding setText()
. In your setText()
method, fix up the passed-in string before chaining to the superclass. Then, reference your EditTextPreference
subclass from your preference XML.
Is it possible to normalize an Android preference value upon change?
-
30-06-2022 - |
سؤال
In Android 4, I have a preference value that I want to appear in the standard form E2C56DB5-DFFB-48D2-B060-D0F5A71096E0. But the user may enter the value without dashes. I would like to allow the user to enter it with any combination of whitespace or dashes, and simply have my code normalize it.
I am using the code below, and I see the log line, but it does nothing. I am guessing this is because Android has another Editor object open that overwrites my changes. Is there any other way to accomplish this?
public class UuidFragment extends PreferenceFragment {
...
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
this.getPreferenceScreen().findPreference("pref_uuid").setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference,
Object newValue) {
if (newValue.toString().length() != 0) {
String normalizedUuid=normalizeUuid(newValue.toString());
// TODO: this code runs but does nothing, I think because after committing the change, there is a higher level editor that commits the old value
// thereby undoing this change
if (!normalizedUuid.equals(newValue.toString())) {
Log.d(TAG, "Adjusting uuid from "+newValue.toString()+" to "+normalizedUuid);
SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(UuidFragment.this.getActivity());
SharedPreferences.Editor editor = settings.edit();
editor.putString(preference.getKey(), normalizedUuid);
editor.commit();
}
return true;
}
}
});
}
}
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