Using PreferenceScreen/PreferenceActivity to configure home screen widgets

Question

I\'m creating an appwidget, where the user should be able to configure it before it is added to the home screen. To me, PreferenceScreen/PreferenceActivity seems perfect for the

Answer 1

You certainly can use a PreferenceActivity for this purpose. If you set it up as the android:configure activity in your widget configuration, though, you will have to do a bit of fancy footwork to then get your widget updated.

Answer 2

commonsWare: https://github.com/commonsguy/cw-advandroid/blob/master/AppWidget/LoremWidget/res/xml/widget_provider.xml your example does not use a config-activity at all and thus certainly no PreferencesActivity.

As far as PreferencesActivities go, it does NOT work to setResult(RESULT_CANCELED); in onCreate(9 and then setResult(...) in onBackPressed. There are wired NullPointerExceptions deep in Launcher.java (line 88X). However it does work do Provider.updateAppWidget() and setResult(RESULT_OK, resultValue); in onCreate and then handle further updates in onBackPressed.

The following snipped may help too:

onCreate() {
CheckBoxPreference dark = (CheckBoxPreference)findPreference("xyz");
dark.setChecked(false);
...
onBackPressed() {
CheckBoxPreference dark = (CheckBoxPreference)findPreference("xyz");
boolean checked = dark.isChecked();

...