Add PreferenceControllers to Network page.

- Also made tiles refresh more efficient: when category changes, only
  refresh dynamic tiles. Static tiles from xml will not change due to
  category change.

Bug: 31799836
Test: RunSettingsRoboTests
Change-Id: I1e4c85f2c122c65ec99729e43a66c80acdd863c8

src/com/android/settings/network/VpnPreferenceController.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.settings.network;
+
+import android.content.Context;
+import android.os.UserHandle;
+import android.os.UserManager;
+import android.provider.Settings;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+
+import com.android.settings.core.PreferenceController;
+import com.android.settingslib.RestrictedLockUtils;
+
+
+public class VpnPreferenceController extends PreferenceController {
+
+    private static final String KEY_VPN_SETTINGS = "vpn_settings";
+
+    private final String mToggleable;
+    private final boolean mIsSecondaryUser;
+
+    public VpnPreferenceController(Context context) {
+        super(context);
+        mToggleable = Settings.Global.getString(context.getContentResolver(),
+                Settings.Global.AIRPLANE_MODE_TOGGLEABLE_RADIOS);
+        mIsSecondaryUser = !UserManager.get(context).isAdminUser();
+    }
+
+    @Override
+    public boolean handlePreferenceTreeClick(Preference preference) {
+        return false;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        // Manually set dependencies for Wifi when not toggleable.
+        if (mToggleable == null || !mToggleable.contains(Settings.Global.RADIO_WIFI)) {
+            final Preference pref = screen.findPreference(KEY_VPN_SETTINGS);
+            if (pref != null) {
+                pref.setDependency(AirplaneModePreferenceController.KEY_TOGGLE_AIRPLANE);
+            }
+        }
+    }
+
+    @Override
+    protected boolean isAvailable() {
+        // TODO: http://b/23693383
+        return mIsSecondaryUser || RestrictedLockUtils.hasBaseUserRestriction(mContext,
+                UserManager.DISALLOW_CONFIG_VPN, UserHandle.myUserId());
+    }
+
+    @Override
+    protected String getPreferenceKey() {
+        return KEY_VPN_SETTINGS;
+    }
+}