[JAVA] [Android] List all setting items on the setting screen

environment

• androidx.preference 1.0.0

code

In the following example, all setting keys are logged. The key is that PreferenceGroup is mixed in with the listed Preference.

PreferenceScreen prefScreen = getPreferenceScreen();
int prefCount = prefScreen.getPreferenceCount();

for (int i = 0; i < prefCount; i++) {
	Preference pref = prefScreen.getPreference(i);
	if (pref instanceof PreferenceGroup) {
		setupPrefsRecursive((PreferenceGroup)pref);
	} else if (!Strings.isNullOrEmpty(pref.getKey())) {
		Log.i(TAG, pref.getKey());
	}
}

private void setupPrefsRecursive(PreferenceGroup prefGroup) {
	int prefGroupCount = prefGroup.getPreferenceCount();
	for (int i = 0; i < prefGroupCount; i++) {
		Preference pref = prefGroup.getPreference(i);
		if (pref instanceof PreferenceGroup) {
			setupPrefsRecursive((PreferenceGroup)pref);
		} else if (!Strings.isNullOrEmpty(pref.getKey())) {
			Log.i(TAG, pref.getKey());
		}
	}
}

If you have the following settings

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
                  xmlns:mozc="http://schemas.android.com/apk/res-auto">
    <PreferenceCategory android:title="@string/pref_cat_1">
        <CheckBoxPreference
            android:defaultValue="false"
            android:key="pref_key_1"
            android:title="@string/pref_title1" />

        <PreferenceCategory android:title="@string/pref_cat_1_1">

            <Preference
                android:key="pref_key_2"
                android:persistent="false"
                android:title="@string/pref_title2">
            </Preference>
        </PreferenceCategory>
    </PreferenceCategory>

    <PreferenceCategory android:title="@string/pref_cat_2">
        <CheckBoxPreference
            android:defaultValue="true"
            android:key="pref_key_3"
            android:title="@string/pref_title3" />
    </PreferenceCategory>
</PreferenceScreen>

The output will be as follows.

pref_key_1
pref_key_2
pref_key_3

reference

I wrote it because there was nothing in particular.