Setting to control UI mode

Fixes: 69783413
Test: tests/robotests/src/com/android/settings/development/DarkUIModePreferenceControllerTest.java
Change-Id: I600036bfb8893f8b1bd93de81c10808bf24998ad

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

@@ -0,0 +1,107 @@
+/*
+ * 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.development;
+
+import android.app.UiModeManager;
+import android.content.Context;
+import android.support.annotation.VisibleForTesting;
+import android.support.v7.preference.ListPreference;
+import android.support.v7.preference.Preference;
+
+import com.android.settings.R;
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.development.DeveloperOptionsPreferenceController;
+
+public class DarkUIPreferenceController extends
+        DeveloperOptionsPreferenceController implements Preference.OnPreferenceChangeListener,
+        PreferenceControllerMixin {
+
+    private static final String DARK_UI_KEY = "dark_ui_mode";
+    private final UiModeManager mUiModeManager;
+
+    public DarkUIPreferenceController(Context context) {
+        this(context, context.getSystemService(UiModeManager.class));
+    }
+
+    @VisibleForTesting
+    DarkUIPreferenceController(Context context, UiModeManager uiModeManager) {
+        super(context);
+        mUiModeManager = uiModeManager;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return DARK_UI_KEY;
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        mUiModeManager.setNightMode(modeToInt((String) newValue));
+        updateSummary(preference);
+        return true;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        updateSummary(preference);
+    }
+
+    private void updateSummary(Preference preference) {
+        int mode = mUiModeManager.getNightMode();
+        ((ListPreference) preference).setValue(modeToString(mode));
+        preference.setSummary(modeToDescription(mode));
+    }
+
+    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;
+        }
+    }
+}

src/com/android/settings/development/DevelopmentSettingsDashboardFragment.java

@@ -375,6 +375,7 @@ public class DevelopmentSettingsDashboardFragment extends RestrictedDashboardFra
         controllers.add(new LocalBackupPasswordPreferenceController(context));
         controllers.add(new StayAwakePreferenceController(context, lifecycle));
         controllers.add(new HdcpCheckingPreferenceController(context));
+        controllers.add(new DarkUIPreferenceController(context));
         controllers.add(new BluetoothSnoopLogPreferenceController(context));
         controllers.add(new OemUnlockPreferenceController(context, activity, fragment));
         controllers.add(new FileEncryptionPreferenceController(context));