Setting to change sysui theme

Users now can manually pick if they want light or dark QS
and launcher

Change-Id: Ic0a43bc5e8777c39bfe5c0bbc606bf6be20f7168
Fixes: 63903361
Test: make RunSettingsRoboTests ROBOTEST_FILTER=SystemUiThemePreferenceControllerTest
Test: manual

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

@@ -0,0 +1,72 @@
+/*
+ * 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 static android.provider.Settings.Secure.THEME_MODE;
+
+import android.content.Context;
+import android.provider.Settings;
+import android.util.FeatureFlagUtils;
+
+import com.android.settings.core.BasePreferenceController;
+
+import androidx.preference.ListPreference;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+/**
+ * Setting where user can pick if SystemUI will be light, dark or try to match
+ * the wallpaper colors.
+ */
+public class SystemUiThemePreferenceController extends BasePreferenceController
+        implements Preference.OnPreferenceChangeListener {
+
+    private ListPreference mSystemUiThemePref;
+
+    public SystemUiThemePreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        boolean enabled = FeatureFlagUtils.isEnabled(mContext, "settings_systemui_theme");
+        return enabled ? AVAILABLE : CONDITIONALLY_UNAVAILABLE;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mSystemUiThemePref = (ListPreference) screen.findPreference(getPreferenceKey());
+        int value = Settings.Secure.getInt(mContext.getContentResolver(), THEME_MODE, 0);
+        mSystemUiThemePref.setValue(Integer.toString(value));
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        int value = Integer.parseInt((String) newValue);
+        Settings.Secure.putInt(mContext.getContentResolver(), THEME_MODE, value);
+        refreshSummary(preference);
+        return true;
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        int value = Settings.Secure.getInt(mContext.getContentResolver(), THEME_MODE, 0);
+        int index = mSystemUiThemePref.findIndexOfValue(Integer.toString(value));
+        return mSystemUiThemePref.getEntries()[index];
+    }
+}