creating a DialogPreference from XML

Question

I have been attempting to use an android.preference.DialogPreference inflated from XML, but the documentation seems to be missing some essential bits, and I can

Answer 1

Here is an example of how to use the dialog preference (subclassing as you mentioned).

package dk.myapp.views;

import android.content.Context;
import android.preference.DialogPreference;
import android.util.AttributeSet;

/**
 * The OptionDialogPreference will display a dialog, and will persist the
 * true when pressing the positive button and false
 * otherwise. It will persist to the android:key specified in xml-preference.
 */
public class OptionDialogPreference extends DialogPreference {

    public OptionDialogPreference(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onDialogClosed(boolean positiveResult) {
        super.onDialogClosed(positiveResult);
        persistBoolean(positiveResult);
    }

}

The preferences.xml should contain

I have a res/value containing (though the key-name can also be declared explicitly above).

resetQuests  

My PreferenceActivity does the actual resetting from onPause. Note that onStop may be too late since the onStop will not always be called immediately after pressing back:

@Override
public void onPause() {
    SharedPreferences prefs = android.preference.PreferenceManager.
        getDefaultSharedPreferences(getBaseContext());
    if(prefs.getBoolean(
        getResources().getString(R.string.prefKeyResetQuests), false)) {
        // apply reset, and then set the pref-value back to false
    }
}

Or equivalently since we are still in the PreferenceActivity:

@Override
protected void onPause() {
    Preference prefResetQuests =
        findPreference(getResources().getString(R.string.prefKeyResetQuests));
    if(prefResetQuests.getSharedPreferences().
        getBoolean(prefResetQuests.getKey(), false)){
        // apply reset, and then set the pref-value back to false 
    }
}