[Wi-Fi] Add IMSI privacy protection warning summary

If a SIM based Wi-Fi network is not provided with IMSI
protection, Wi-Fi detail UI shows the warning summary if
the Wi-Fi network is connected.

Bug: 148283447
Test: make RunSettingsRoboTests ROBOTEST_FILTER=WifiSecondSummaryController2Test
      make RunSettingsRoboTests ROBOTEST_FILTER=LinkifySummaryPreferenceTest

Change-Id: I689a75d2f0a2ae6196b2ed5985b8ff141fbac8b4

src/com/android/settings/wifi/details2/WifiSecondSummaryController2.java

@@ -0,0 +1,51 @@
+/*
+ * 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.wifi.details2;
+
+import android.content.Context;
+import android.text.TextUtils;
+
+import com.android.settings.core.BasePreferenceController;
+import com.android.wifitrackerlib.WifiEntry;
+
+/**
+ * {@link BasePreferenceController} that display the second summary. If users click the preference,
+ * @link ClickableSpan#onClick} of the first {@link ClickableSpan} in the summary will be called.
+ */
+public class WifiSecondSummaryController2 extends BasePreferenceController {
+
+    private static final String KEY_WIFI_SECOND_SUMMARY = "second_summary";
+    private CharSequence mSecondSummary;
+
+    public WifiSecondSummaryController2(Context context) {
+        super(context, KEY_WIFI_SECOND_SUMMARY);
+    }
+
+    public void setWifiEntry(WifiEntry wifiEntry) {
+        mSecondSummary = wifiEntry.getSecondSummary();
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return TextUtils.isEmpty(mSecondSummary) ? CONDITIONALLY_UNAVAILABLE : AVAILABLE;
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        return mSecondSummary;
+    }
+}