Add smart battery page for battery settings

This page contains prefs for smart battery and app restriction.

Bug: 71502850
Test: RunSettingsRoboTests

Change-Id: I194af30cbc7b2496b10098fcb67f1116e0722310

src/com/android/settings/fuelgauge/SmartBatteryPreferenceController.java

@@ -0,0 +1,54 @@
+/*
+ * 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.fuelgauge;
+
+import android.content.Context;
+import android.support.annotation.VisibleForTesting;
+import android.support.v7.preference.Preference;
+
+import com.android.settings.applications.LayoutPreference;
+import com.android.settings.core.BasePreferenceController;
+
+/**
+ * Controller to change and update the smart battery toggle
+ */
+public class SmartBatteryPreferenceController extends BasePreferenceController implements
+        Preference.OnPreferenceChangeListener {
+    private static final String KEY_SMART_BATTERY = "smart_battery";
+
+    public SmartBatteryPreferenceController(Context context) {
+        super(context, KEY_SMART_BATTERY);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        super.updateState(preference);
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        final boolean smartBatteryOn = (Boolean) newValue;
+        //TODO(b/71502850): use smart battery API here to update the state
+        return true;
+    }
+}