[Provider Model] Add connected ethernet network preference

- Show the preference if connected to ethernet network

- Hide the preference if not connected to ethernet network

- Screenshot:
  https://screenshot.googleplex.com/5ZkZXnTr9Hcfsyt

Bug: 176796623
Test: manual test
- atest ConnectedEthernetNetworkControllerTest
- make RunSettingsRoboTests ROBOTEST_FILTER=NetworkProviderSettingsTest

Change-Id: I0f062eb2ee4898976f5e7a1c3f2c4061b60a3126

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

@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2021 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 static com.android.settings.network.InternetUpdater.INTERNET_ETHERNET;
+
+import android.content.Context;
+import android.graphics.drawable.Drawable;
+
+import androidx.lifecycle.Lifecycle;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settingslib.Utils;
+import com.android.settingslib.core.AbstractPreferenceController;
+
+/**
+ * PreferenceController to show the connected ethernet network.
+ */
+public class ConnectedEthernetNetworkController extends AbstractPreferenceController
+        implements InternetUpdater.OnInternetTypeChangedListener {
+
+    public static final String KEY = "connected_ethernet_network";
+
+    private Preference mPreference;
+    private InternetUpdater mInternetUpdater;
+    private @InternetUpdater.InternetType int mInternetType;
+
+    public ConnectedEthernetNetworkController(Context context, Lifecycle lifecycle) {
+        super(context);
+        mInternetUpdater = new InternetUpdater(context, lifecycle, this);
+        mInternetType = mInternetUpdater.getInternetType();
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return mInternetType == INTERNET_ETHERNET;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mPreference = screen.findPreference(KEY);
+        final Drawable drawable = mContext.getDrawable(R.drawable.ic_settings_ethernet);
+        if (drawable != null) {
+            drawable.setTintList(
+                    Utils.getColorAttr(mContext, android.R.attr.colorControlActivated));
+            mPreference.setIcon(drawable);
+        }
+    }
+
+    /**
+     * Called when internet type is changed.
+     *
+     * @param internetType the internet type
+     */
+    public void onInternetTypeChanged(@InternetUpdater.InternetType int internetType) {
+        mInternetType = internetType;
+        if (mPreference != null) {
+            mPreference.setVisible(isAvailable());
+        }
+    }
+}

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

@@ -207,6 +207,8 @@ public class NetworkProviderSettings extends RestrictedSettingsFragment
             mViewAirplaneModeNetworksButtonPreference;
     @VisibleForTesting
     LayoutPreference mResetInternetPreference;
+    @VisibleForTesting
+    ConnectedEthernetNetworkController mConnectedEthernetNetworkController;
 
     /**
      * Mobile networks list for provider model
@@ -267,6 +269,7 @@ public class NetworkProviderSettings extends RestrictedSettingsFragment
         }
         addNetworkMobileProviderController();
         addViewAirplaneModeNetworksButtonController();
+        addConnectedEthernetNetworkController();
     }
 
     private void addNetworkMobileProviderController() {
@@ -287,6 +290,14 @@ public class NetworkProviderSettings extends RestrictedSettingsFragment
         mViewAirplaneModeNetworksButtonPreference.displayPreference(getPreferenceScreen());
     }
 
+    private void addConnectedEthernetNetworkController() {
+        if (mConnectedEthernetNetworkController == null) {
+            mConnectedEthernetNetworkController =
+                    new ConnectedEthernetNetworkController(getContext(), getSettingsLifecycle());
+        }
+        mConnectedEthernetNetworkController.displayPreference(getPreferenceScreen());
+    }
+
     @Override
     public void onActivityCreated(Bundle savedInstanceState) {
         super.onActivityCreated(savedInstanceState);