Can I Insert A Android:defaultValue Trait For RingtonePreference, Via XML?
Solution 1:
You can define the default in the XML. As you said, it needs a URI. Simply put the default URI for what you need. For example, for a default alarm sound you would put:
<RingtonePreference android:key="alarm"
android:title="Alarm" android:name="Alarm"
android:summary="Select an alarm"
android:ringtoneType="alarm" android:showDefault="true"
android:defaultValue="content://settings/system/alarm_alert" />
For a notification you would put:
android:defaultValue="content://settings/system/notification_sound"
Etc.
Solution 2:
Figured out a work-around, in setting the default ringtone.
For the people who uses both a RingtonePreference and PreferenceManager.setDefaultValues(), android:defaultValue on a RingtonePreference takes in a string to a ringtone's URI. By providing an empty string, you're defaulting the preference to "silence," while other strings will probably lead to no valid URI.
The work-around, then, is to provide a bogus string, such as android:defaultValue="defaultRingtone":
<RingtonePreference android:key="alarm"
android:title="Alarm" android:name="Alarm"
android:summary="Select an alarm"
android:ringtoneType="alarm" android:showDefault="true"
android:defaultValue="defaultRingtone" />
When calling PreferenceManager.setDefaultValues(), grab the preference, and check if the bogus string is being stored:
// Set the stored preferences to default values defined in options.xml
PreferenceManager.setDefaultValues(this, R.layout.options, false);
// Check the stored string value, under the RingtonPreference tag
final SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(this);
final String savedUri = savedState.getString("alarm", "");
// By default, set the alarm's URI to null
Uri alarmUri = null;
// Check if a String was actually provided
if(savedUri.length() > 0) {
// If the stored string is the bogus string...
if(savedUri.equals("defaultRingtone")) {
// Set the alarm to this system's default alarm.
alarmUri = Settings.System.DEFAULT_ALARM_ALERT_URI;
// Save this alarm's string, so that we don't have to go through this again
final SharedPreferences.Editor saveEditor = saveState.edit();
saveEditor.putString("alarm", alarmUri.toString());
saveEditor.commit();
}
// Otherwise, retrieve the URI as normal.
else {
alarmUri = Uri.parse(savedUri);
}
}
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