Android Dynamic Array ListPreference

Question

How to Create Dynamic Array For ListPreference From Java Side.

I Don't use Below Xml .

<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="listArray">
 <item>Value 1</item>
 <item>Value 2</item>
<item>Value 3</item>
</string-array>

<string-array name="listValues">
 <item>1</item>
 <item>2</item>
 <item>3</item>
</string-array>
</resources>

Perloff

Similar question: #6475207 – Languid

Answer 1

Place preferences.xml in res/xml

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">

    <PreferenceCategory android:title="Some title">     

        <ListPreference android:key="default_category"
            android:title="Dynamic categories" android:summary="Dynamic categories summary"
            android:defaultValue="0" />
    </PreferenceCategory>
</PreferenceScreen>

In your activity that extends PreferenceActivity you do something like this in onCreate().

ListPreference listPreferenceCategory = (ListPreference) findPreference("default_category");
if (listPreferenceCategory != null) {
    ArrayList<Category> categoryList = getCategories();
    CharSequence entries[] = new String[categoryList.size()];
    CharSequence entryValues[] = new String[categoryList.size()];
    int i = 0;
    for (Category category : categoryList) {
        entries[i] = category.getCategoryName();
        entryValues[i] = Integer.toString(i);
        i++;
    }
    listPreferenceCategory.setEntries(entries);
    listPreferenceCategory.setEntryValues(entryValues);
}

Typhon

code is work but clicked the listpreference then error exception? – Perloff

your code is changed but clicked preference then raise error. – Perloff

05-26 14:01:55.925: ERROR/AndroidRuntime(4827): java.lang.NullPointerException – Perloff

05-26 14:01:55.925: ERROR/AndroidRuntime(4827): at android.preference.ListPreference.findIndexOfValue(ListPreference.java:169) – Perloff

05-26 14:01:55.925: ERROR/AndroidRuntime(4827): at android.preference.ListPreference.getValueIndex(ListPreference.java:178) – Perloff

I happened to see you code before it was removed. int c = 0; for (int i=0; i<=ar.length-1; i++) { entries[c] = ar[c]; entryValues[c] = ar[c]; c++; } – Typhon