Move theme setting out of tuner to display

Test: runtest --path
packages/apps/Settings/tests/unit/src/com/android/settings/display/
Fixes: 34682466

Change-Id: Ifc21e390bf8441308871d487bd60d59826603ec2

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

@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2017 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 com.android.internal.logging.nano.MetricsProto.MetricsEvent.ACTION_THEME;
+
+import android.app.AlertDialog;
+import android.app.UiModeManager;
+import android.content.Context;
+import android.content.DialogInterface.OnClickListener;
+import android.support.v7.preference.ListPreference;
+import android.support.v7.preference.Preference;
+
+import com.android.settings.R;
+import com.android.settings.core.PreferenceController;
+import com.android.settings.core.instrumentation.MetricsFeatureProvider;
+import com.android.settings.overlay.FeatureFactory;
+
+import libcore.util.Objects;
+
+public class ThemePreferenceController extends PreferenceController implements
+        Preference.OnPreferenceChangeListener {
+
+    private static final String KEY_THEME = "theme";
+
+    private final UiModeManager mUiModeManager;
+    private final MetricsFeatureProvider mMetricsFeatureProvider;
+
+    public ThemePreferenceController(Context context) {
+        super(context);
+        mUiModeManager = context.getSystemService(UiModeManager.class);
+        mMetricsFeatureProvider = FeatureFactory.getFactory(context).getMetricsFeatureProvider();
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_THEME;
+    }
+
+    @Override
+    public boolean handlePreferenceTreeClick(Preference preference) {
+        if (KEY_THEME.equals(preference.getKey())) {
+            mMetricsFeatureProvider.action(mContext, ACTION_THEME);
+        }
+        return false;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        ListPreference pref = (ListPreference) preference;
+        String[] options = mUiModeManager.getAvailableThemes();
+        for (int i = 0; i < options.length; i++) {
+            options[i] = nullToDefault(options[i]);
+        }
+        pref.setEntries(options);
+        pref.setEntryValues(options);
+        String theme = mUiModeManager.getTheme();
+        if (theme == null) {
+            theme = mContext.getString(R.string.default_theme);
+        }
+        pref.setValue(nullToDefault(theme));
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        if (Objects.equal(newValue, mUiModeManager.getTheme())) {
+            return true;
+        }
+        // TODO: STOPSHIP Don't require reboot and remove this prompt.
+        OnClickListener onConfirm = (d, i) -> {
+            mUiModeManager.setTheme(defaultToNull((String) newValue));
+            ((ListPreference) preference).setValue((String) newValue);
+        };
+        new AlertDialog.Builder(mContext)
+                .setTitle(R.string.change_theme_reboot)
+                .setPositiveButton(com.android.internal.R.string.global_action_restart, onConfirm)
+                .setNegativeButton(android.R.string.cancel, null)
+                .show();
+        return false;
+    }
+
+    @Override
+    public boolean isAvailable() {
+        String[] themes = mUiModeManager.getAvailableThemes();
+        return themes != null && themes.length > 1;
+    }
+
+    private String nullToDefault(String input) {
+        if (input == null) {
+            return mContext.getString(R.string.default_theme);
+        }
+        return input;
+    }
+
+    private String defaultToNull(String input) {
+        if (mContext.getString(R.string.default_theme).equals(input)) {
+            return null;
+        }
+        return input;
+    }
+}