title: how to Change value of CheckBoxPreference after updating app
body: <p>in my application for Setting screen I am using PreferenceFragment. In this screen i have several checkbox, some checkbox bydefault are non checked. Now in next release I want to set them as checked. so in .xml file i had change value <code>&lt;CheckBoxPreference    android:checked="true"  android:defaultValue="true"</code> , and also change Shared preference value according to this. If I install fresh application everything is good. But if I install application from play store and tries to update that application using new signed build, then these check boxes are not selected by default. In this case what to do if want to change value of CheckBoxPreference. Any suggestion will be appreciated. Thanks</p>