Update Network & internet->Wi-Fi to use MasterSwitchPreference.

- Add a preference controller for Network & internet->Wi-Fi to control
  the preference toggling and summary update.
- Refactor WifiSettings and WifiEnabler to share code between the new
  wifi preference controller and the wifi setting.
- Refactor BluetoothSummaryHelper to have a common base class with the
  WifiSummaryHelper.
- Rename the summary helper to summary updater.

Bug: 34280769
Test: make RunSettingsRoboTests
Change-Id: I00ebfc161bcef89331bb41ba405ed8cb8232d248

src/com/android/settings/wifi/WifiMasterSwitchPreferenceController.java

@@ -0,0 +1,102 @@
+/*
+ * 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.wifi;
+
+import android.content.Context;
+import android.support.v7.preference.PreferenceScreen;
+
+import com.android.settings.core.PreferenceController;
+import com.android.settings.core.instrumentation.MetricsFeatureProvider;
+import com.android.settings.core.lifecycle.LifecycleObserver;
+import com.android.settings.core.lifecycle.events.OnPause;
+import com.android.settings.core.lifecycle.events.OnResume;
+import com.android.settings.core.lifecycle.events.OnStart;
+import com.android.settings.core.lifecycle.events.OnStop;
+import com.android.settings.widget.SummaryUpdater;
+import com.android.settings.widget.MasterSwitchPreference;
+import com.android.settings.widget.MasterSwitchController;
+
+public class WifiMasterSwitchPreferenceController extends PreferenceController
+        implements SummaryUpdater.OnSummaryChangeListener,
+        LifecycleObserver, OnResume, OnPause, OnStart, OnStop {
+
+    private static final String KEY_TOGGLE_WIFI = "toggle_wifi";
+
+    private MasterSwitchPreference mWifiPreference;
+    private WifiEnabler mWifiEnabler;
+    private final WifiSummaryUpdater mSummaryHelper;
+    private final MetricsFeatureProvider mMetricsFeatureProvider;
+
+    public WifiMasterSwitchPreferenceController(Context context,
+            MetricsFeatureProvider metricsFeatureProvider) {
+        super(context);
+        mMetricsFeatureProvider = metricsFeatureProvider;
+        mSummaryHelper = new WifiSummaryUpdater(mContext, this);
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mWifiPreference = (MasterSwitchPreference) screen.findPreference(KEY_TOGGLE_WIFI);
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return true;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_TOGGLE_WIFI;
+    }
+
+    @Override
+    public void onResume() {
+        mSummaryHelper.register(true);
+        if (mWifiEnabler != null) {
+            mWifiEnabler.resume(mContext);
+        }
+    }
+
+    @Override
+    public void onPause() {
+        if (mWifiEnabler != null) {
+            mWifiEnabler.pause();
+        }
+        mSummaryHelper.register(false);
+    }
+
+    @Override
+    public void onStart() {
+        mWifiEnabler = new WifiEnabler(mContext, new MasterSwitchController(mWifiPreference),
+            mMetricsFeatureProvider);
+    }
+
+    @Override
+    public void onStop() {
+        if (mWifiEnabler != null) {
+            mWifiEnabler.teardownSwitchController();
+        }
+    }
+
+    @Override
+    public void onSummaryChanged(String summary) {
+        if (mWifiPreference != null) {
+            mWifiPreference.setSummary(summary);
+        }
+    }
+
+}