Move NightMode to Display settings

Test: manual
Test: make RunSettingsRoboTests ROBOTEST_FILTER=DarkUIPreferenceController
Bug: 110758454
Change-Id: Ie389a0e55eb39f2b43d4e9c0739ad3f61469d740

src/com/android/settings/display/DarkUIPreferenceController.java

@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2018 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;
+
+import android.app.UiModeManager;
+import android.content.Context;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+
+import androidx.annotation.VisibleForTesting;
+import androidx.preference.ListPreference;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+public class DarkUIPreferenceController extends BasePreferenceController
+        implements Preference.OnPreferenceChangeListener {
+
+    private UiModeManager mUiModeManager;
+
+    public DarkUIPreferenceController(Context context, String key) {
+        super(context, key);
+        mUiModeManager = context.getSystemService(UiModeManager.class);
+    }
+
+    @VisibleForTesting
+    void setUiModeManager(UiModeManager uiModeManager) {
+        mUiModeManager = uiModeManager;
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        int value = mUiModeManager.getNightMode();
+        ListPreference preference = (ListPreference) screen.findPreference(getPreferenceKey());
+        preference.setValue(modeToString(value));
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        mUiModeManager.setNightMode(modeToInt((String) newValue));
+        refreshSummary(preference);
+        return true;
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        return modeToDescription(mUiModeManager.getNightMode());
+    }
+
+    private String modeToDescription(int mode) {
+        String[] values = mContext.getResources().getStringArray(R.array.dark_ui_mode_entries);
+        switch (mode) {
+            case UiModeManager.MODE_NIGHT_AUTO:
+                return values[0];
+            case UiModeManager.MODE_NIGHT_YES:
+                return values[1];
+            case UiModeManager.MODE_NIGHT_NO:
+            default:
+                return values[2];
+
+        }
+    }
+
+    private String modeToString(int mode) {
+        switch (mode) {
+            case UiModeManager.MODE_NIGHT_AUTO:
+                return "auto";
+            case UiModeManager.MODE_NIGHT_YES:
+                return "yes";
+            case UiModeManager.MODE_NIGHT_NO:
+            default:
+                return "no";
+
+        }
+    }
+
+    private int modeToInt(String mode) {
+        switch (mode) {
+            case "auto":
+                return UiModeManager.MODE_NIGHT_AUTO;
+            case "yes":
+                return UiModeManager.MODE_NIGHT_YES;
+            case "no":
+            default:
+                return UiModeManager.MODE_NIGHT_NO;
+        }
+    }
+}