Move date/time prefs to PreferenceController and add tests.

Bug: 32996243
Test: RunSettingsRoboTests
Change-Id: Ie537bbcc35a96a63251e46f84b57c0a861b9d013

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

@@ -0,0 +1,67 @@
+/*
+ * 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.datetime;
+
+import android.content.Context;
+import android.support.annotation.VisibleForTesting;
+import android.support.v7.preference.Preference;
+
+import com.android.settings.core.PreferenceController;
+import com.android.settingslib.datetime.ZoneGetter;
+
+import java.util.Calendar;
+
+public class TimeZonePreferenceController extends PreferenceController {
+
+    private static final String KEY_TIMEZONE = "timezone";
+
+    private final AutoTimeZonePreferenceController mAutoTimeZonePreferenceController;
+
+    public TimeZonePreferenceController(Context context,
+            AutoTimeZonePreferenceController autoTimeZonePreferenceController) {
+        super(context);
+        mAutoTimeZonePreferenceController = autoTimeZonePreferenceController;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        preference.setSummary(getTimeZoneOffsetAndName());
+        preference.setEnabled(!mAutoTimeZonePreferenceController.isEnabled());
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return true;
+    }
+
+    @Override
+    public boolean handlePreferenceTreeClick(Preference preference) {
+        return false;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_TIMEZONE;
+    }
+
+    @VisibleForTesting
+    CharSequence getTimeZoneOffsetAndName() {
+        final Calendar now = Calendar.getInstance();
+        return ZoneGetter.getTimeZoneOffsetAndName(mContext,
+                now.getTimeZone(), now.getTime());
+    }
+}