Add fragment in xml instead of using injected way

- It can improve performance because we use less injected item
- Also remove summary provider from those fragments

Bug: 141653158
Test: robolectric
Change-Id: I6255f71b3b8300aea064a4fefd6711c1ff59e08a

src/com/android/settings/datetime/DateTimePreferenceController.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2019 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.datetime;
+
+import android.content.Context;
+
+import com.android.settings.core.BasePreferenceController;
+import com.android.settingslib.datetime.ZoneGetter;
+
+import java.util.Calendar;
+
+public class DateTimePreferenceController extends BasePreferenceController {
+
+    public DateTimePreferenceController(Context context, String key) {
+        super(context, key);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        final Calendar now = Calendar.getInstance();
+        return ZoneGetter.getTimeZoneOffsetAndName(mContext,
+                now.getTimeZone(), now.getTime());
+    }
+}