[Wi-Fi] Support WiFi detail page for OpenRoaming feature in AOSP setting.

Issue: Openroaming should have a specific detail page.
Solution: Apply the mock design to only reserve two preference items:
          1.Auto-connect
          2.Scription details

Bug: 146669261
Test: Add unit test case to test the new controller: WifiSubscriptionDetailPreferenceController2
Change-Id: Iba96500062f412f4cdcd1c8248544657770ab231

src/com/android/settings/wifi/details2/WifiSubscriptionDetailPreferenceController2.java

@@ -0,0 +1,60 @@
+/*
+ * 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 androidx.preference.Preference;
+
+import com.android.settings.core.BasePreferenceController;
+import com.android.wifitrackerlib.WifiEntry;
+
+/**
+ * {@link BasePreferenceController} that controls show the subscription detail preference item.
+ * or not
+ */
+public class WifiSubscriptionDetailPreferenceController2 extends BasePreferenceController {
+
+    private static final String KEY_WIFI_SUBSCRIPTION_DETAIL = "subscription_detail";
+    private WifiEntry mWifiEntry;
+
+    public WifiSubscriptionDetailPreferenceController2(Context context) {
+        super(context, KEY_WIFI_SUBSCRIPTION_DETAIL);
+    }
+
+    public void setWifiEntry(WifiEntry wifiEntry) {
+        mWifiEntry = wifiEntry;
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        if (mWifiEntry.canManageSubscription()) {
+            return AVAILABLE;
+        }
+
+        return CONDITIONALLY_UNAVAILABLE;
+    }
+
+    @Override
+    public boolean handlePreferenceTreeClick(Preference preference) {
+        if (KEY_WIFI_SUBSCRIPTION_DETAIL.equals(preference.getKey())) {
+            mWifiEntry.manageSubscription();
+            return true; /* click is handled */
+        }
+
+        return false; /* click is not handled */
+    }
+}