Detect change in preferences

Question

I have a class extending PreferenceActivity:

public class PreferenceActivity extends android.preference.PreferenceActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.preferences);
    }

}

And I have multiple preferences:

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

        <EditTextPreference
            android:key="accessToken_key"
            android:title="Access Token"
            android:summary="The access token required to access the web server"
            android:dialogTitle="Access Token"
            android:numeric="integer"
            android:maxLength="12" />

    </PreferenceCategory>

</PreferenceScreen>

How can I detect when a user changes the EditTextPreference so that I can immediately store the new value into a variable?

Answer 1

Try looking at

http://developer.android.com/reference/android/preference/Preference.html http://developer.android.com/reference/android/preference/Preference.OnPreferenceChangeListener.html

If you are NOT running fragment based Preference then

    findPreference("key_for_pref").setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {

        @Override
        public boolean onPreferenceChange(Preference preference, Object newValue) {
            // TODO Auto-generated method stub
            return false;
        }
    });

WARNING: This findPreference api is deprecated on newer fragment based preferences

Hope this will help.