[Provider Model] Add Wi-Fi toggle

- Network & internet Settings
  - Remove “Show airplane mode networks"

- Internet Settings
  - Add “Wi-Fi” switch preference
    - Show “Find and connect to Wi-Fi networks” in summary

- Screenshot:
  https://screenshot.googleplex.com/AnoXf4qDe2jPirP

Bug: 181858434
Test: manual test
atest -c NetworkDashboardFragmentTest \
         WifiSwitchPreferenceControllerTest
make RunSettingsRoboTests ROBOTEST_FILTER=NetworkProviderSettingsTest

Change-Id: Ic420ff40cfdfb3ae29ee6f754ce139cb54651bda

src/com/android/settings/network/WifiSwitchPreferenceController.java

@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2020 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.network;
+
+import android.content.Context;
+
+import androidx.lifecycle.Lifecycle;
+import androidx.lifecycle.LifecycleObserver;
+import androidx.lifecycle.OnLifecycleEvent;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.overlay.FeatureFactory;
+import com.android.settings.widget.GenericSwitchController;
+import com.android.settings.wifi.WifiEnabler;
+import com.android.settingslib.RestrictedSwitchPreference;
+import com.android.settingslib.core.AbstractPreferenceController;
+
+/**
+ * This controller helps to manage the state of wifi switch preference.
+ */
+public class WifiSwitchPreferenceController extends AbstractPreferenceController implements
+        LifecycleObserver {
+
+    public static final String KEY = "wifi_switch";
+
+    private RestrictedSwitchPreference mPreference;
+
+    private WifiEnabler mWifiEnabler;
+
+    public WifiSwitchPreferenceController(Context context, Lifecycle lifecycle) {
+        super(context);
+        if (lifecycle == null) {
+            throw new IllegalArgumentException("Lifecycle must be set");
+        }
+
+        lifecycle.addObserver(this);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY;
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return true;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mPreference = screen.findPreference(getPreferenceKey());
+    }
+
+    /** Lifecycle.Event.ON_START */
+    @OnLifecycleEvent(Lifecycle.Event.ON_START)
+    public void onStart() {
+        if (mPreference != null) {
+            mWifiEnabler = new WifiEnabler(mContext, new GenericSwitchController(mPreference),
+                    FeatureFactory.getFactory(mContext).getMetricsFeatureProvider());
+        }
+    }
+
+    /** Lifecycle.Event.ON_STOP */
+    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
+    public void onStop() {
+        if (mWifiEnabler != null) {
+            mWifiEnabler.teardownSwitchController();
+        }
+    }
+
+    /** Lifecycle.Event.ON_RESUME */
+    @OnLifecycleEvent(Lifecycle.Event.ON_RESUME)
+    public void onResume() {
+        if (mWifiEnabler != null) {
+            mWifiEnabler.resume(mContext);
+        }
+    }
+
+    /** Lifecycle.Event.ON_PAUSE */
+    @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
+    public void onPause() {
+        if (mWifiEnabler != null) {
+            mWifiEnabler.pause();
+        }
+    }
+}