Custom dark theme scheduling

allows the use to set the start and end automatic dark theme
activation within a day.

Test: run all settings tests
Change-Id: If96fc050159724d553acb09c2da4fab1d5ff519f

src/com/android/settings/display/darkmode/DarkModeCustomPreferenceController.java

@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2020 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.display.darkmode;
+
+import android.app.Dialog;
+import android.app.TimePickerDialog;
+import android.app.UiModeManager;
+import android.content.Context;
+import android.text.TextUtils;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+import com.android.settings.core.BasePreferenceController;
+import com.android.settings.dashboard.DashboardFragment;
+
+import java.time.LocalTime;
+import java.time.format.DateTimeFormatter;
+
+import static android.app.UiModeManager.MODE_NIGHT_CUSTOM;
+
+/**
+ * Controller for custom mode night mode time settings
+ */
+public class DarkModeCustomPreferenceController extends BasePreferenceController {
+    private static final String START_TIME_KEY = "dark_theme_start_time";
+    private static final String END_TIME_KEY = "dark_theme_end_time";
+    public static DateTimeFormatter formatter = DateTimeFormatter.ofPattern("hh:mm a");
+    private final UiModeManager mUiModeManager;
+    private TimeFormatter mFormat;
+    private DarkModeSettingsFragment mFragmet;
+
+    public DarkModeCustomPreferenceController(Context context, String key) {
+        super(context, key);
+        mFormat = new TimeFormatter(mContext);
+        mUiModeManager = context.getSystemService(UiModeManager.class);
+    }
+
+    public DarkModeCustomPreferenceController(
+            Context context, String key,
+            DarkModeSettingsFragment fragment) {
+        this(context, key);
+        mFragmet = fragment;
+    }
+
+    public DarkModeCustomPreferenceController(
+            Context context, String key,
+            DarkModeSettingsFragment fragment,
+            TimeFormatter format) {
+        this(context, key, fragment);
+        mFormat = format;
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    public TimePickerDialog getDialog() {
+        final LocalTime initialTime;
+        if (TextUtils.equals(getPreferenceKey(), START_TIME_KEY)) {
+            initialTime = mUiModeManager.getCustomNightModeStart();
+        } else {
+            initialTime = mUiModeManager.getCustomNightModeEnd();
+        }
+        return  new TimePickerDialog(mContext, (view, hourOfDay, minute) -> {
+            final LocalTime time = LocalTime.of(hourOfDay, minute);
+            if (TextUtils.equals(getPreferenceKey(), START_TIME_KEY)) {
+                mUiModeManager.setCustomNightModeStart(time);
+            } else {
+                mUiModeManager.setCustomNightModeEnd(time);
+            }
+            if (mFragmet != null) {
+                mFragmet.refresh();
+            }
+        }, initialTime.getHour(), initialTime.getMinute(), mFormat.is24HourFormat());
+    }
+
+    @Override
+    protected void refreshSummary(Preference preference) {
+        if (mUiModeManager.getNightMode() != MODE_NIGHT_CUSTOM) {
+            preference.setVisible(false);
+            return;
+        }
+        preference.setVisible(true);
+        final LocalTime time;
+        if (TextUtils.equals(getPreferenceKey(), START_TIME_KEY)) {
+            time = mUiModeManager.getCustomNightModeStart();
+        } else {
+            time = mUiModeManager.getCustomNightModeEnd();
+        }
+        preference.setSummary(mFormat.of(time));
+    }
+}