Default value of Android preference

Question

How do you get the default value of an Android preference defined in XML? I don't want to repeat the definition of the default value in both the code and the preferences XML.

Answer 1

You can define default value in resources (/values/bool.xml):

<resources>     <bool name="mypreference_default">true</bool> </resources> 

Use the value in the preferences.xml:

<CheckBoxPreference     android:defaultValue="@bool/mypreference_default"     android:key="mypreference"     android:title="@string/mypreference_title" /> 

Then use in code:

SharedPreferences p = PreferenceManager.getDefaultSharedPreferences(context); Boolean value = context.getResources().getBoolean(R.bool.mypreference_default); Boolean b = p.getBoolean("mypreference", value); 

Answer 2

First you need to define default values in your preference XML file. Then you can populate preferences with default values in your main Activity by calling:

PreferenceManager.setDefaultValues(this, R.xml.preference, false); 

When you need to retrieve a some preference just call:

int value = prefs.getInt("key", null); 

Since your preferences are populated you won't get null value.