Use support library for preferences.

Change-Id: I57a28730b3c0547fc5b5045ab4ca99a106965a9d

Author: AndrewScull

app/src/main/java/com/afwsamples/testdpc/policy/UserRestrictionsDisplayFragment.java

@@ -57,10 +57,10 @@
 import android.content.Context;
 import android.os.Bundle;
 import android.os.UserManager;
-import android.preference.Preference;
-import android.preference.PreferenceFragment;
-import android.preference.PreferenceScreen;
-import android.preference.SwitchPreference;
+import android.support.v14.preference.PreferenceFragment;
+import android.support.v14.preference.SwitchPreference;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
 import android.util.Log;
 import android.widget.Toast;
 
@@ -181,12 +181,16 @@ public static UserRestrictionsDisplayFragment newInstance() {
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
         mDevicePolicyManager = (DevicePolicyManager) getActivity().getSystemService(
                 Context.DEVICE_POLICY_SERVICE);
         mUserManager = (UserManager) getActivity().getSystemService(Context.USER_SERVICE);
         mAdminComponentName = DeviceAdminReceiver.getComponentName(getActivity());
+        super.onCreate(savedInstanceState);
+        getActivity().getActionBar().setTitle(R.string.user_restrictions_management_title);
+    }
 
+    @Override
+    public void onCreatePreferences(Bundle bundle, String rootkey) {
         PreferenceScreen preferenceScreen = getPreferenceManager().createPreferenceScreen(
                 getActivity());
         setPreferenceScreen(preferenceScreen);
@@ -208,7 +212,6 @@ public void onCreate(Bundle savedInstanceState) {
     public void onResume() {
         super.onResume();
         updateAllUserRestrictions();
-        getActivity().getActionBar().setTitle(R.string.user_restrictions_management_title);
     }
 
     @Override