如何使用 getString() 获取首选项的“标题”而不是“值”

Question

I'm new to both Java and Android programming and I'm learning fairly quickly, but I can't seem to find any answer to this one after an hour of googling...

I've setup my android app with a preferences.xml that uses a ListPreference entry. It refers to 2 string arrays, one for the list display, the other for the actual values:

    <ListPreference
        android:title="Draw Rule"
        android:summary="Choose between Draw 1 and Draw 3"
        android:key="draw_rule"
        android:defaultValue="draw3"
        android:entries="@array/drawrule"
        android:entryValues="@array/drawruleValues" />

My arrays.xml looks like this:

<string-array name="drawrule">
    <item name="draw1">Draw 1</item>
    <item name="draw3">Draw 3</item>
</string-array>
<string-array name="drawruleValues">
    <item name="draw1">draw1</item>
    <item name="draw3">draw3</item>
</string-array>

To get the preferences, I start by using getDefaultSharedPreferences:

    SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this);

I understand how to get the correct value from drawruleValues with sharedPrefs.getString("draw_rule", "null") . My problem is that for displays purposes I'd like to show the item from drawrule instead, not drawruleValues (eg "Draw Setting: Draw 3" ).

Can anyone tell me how to do this?

Answer 1

Option #1: Don't use separate <string-array> resources. Use drawrule for both arrays in your preference definition.

Option #2: Iterate over the contents of drawruleValues (via getStringArray() on a Resources object) to find the index of the value, then use that to get the "title" from the drawrule array (again, via getStringArray() on a Resources object).