Android Studio：偏好 android:summary="%s"，但有一定的默认摘要

Question

following problem: I have a dice application which should offer one, two or three dice to use. I am currently creating a DropDownPreference to change the value of the number of dice. I always want the current amount of dice to be displayed in the summary using "%s" in the android:summary attribute. The problem is, that the default summary entry seems always to be the first value of the "preference_dice" array. Is there a way to display a certain default summary entry and afterwards displaying the currently selected amount of dice? I need to start with two dice by default. Thanks!

DropDownPreference:

<DropDownPreference
        app:key="@string/preference_dice"
        android:title="@string/preference_dice_title"
        android:defaultValue="@string/preference_dice_2_value"
        android:entries="@array/preference_dice"
        android:entryValues="@array/preference_dice_values"
        android:summary="%s"
        />

Array for entries:

<string-array name="preference_dice">
    <item>@string/preference_dice_1</item>
    <item>@string/preference_dice_2</item>
    <item>@string/preference_dice_3</item>
</string-array>

Answer 1

You need to do it from code. Try the following way:

DropDownPreference preference = (DropDownPreference) findPreference ("preference_dice");
preference.setDefaultValue(preference_dice_1);