Update search for mobile network settings

This CL make all mobile related preferences support:
1. If subId is manually set, check visibility by subId
2. If not, try find whether there is one active subId meets requirement.
If so, isAvailable() will return true to enable search.

Bug: 77276236
Test: RunSettingsRoboTests
Change-Id: I24e2d2f5e882284ba8e997b844caee7722b6b07d

src/com/android/settings/network/telephony/TelephonyBasePreferenceController.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2019 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.telephony;
+
+import android.content.Context;
+import android.telephony.SubscriptionManager;
+
+import com.android.settings.core.BasePreferenceController;
+
+/**
+ * {@link BasePreferenceController} that used by all preferences that requires subscription id.
+ */
+public abstract class TelephonyBasePreferenceController extends BasePreferenceController
+        implements TelephonyAvailabilityCallback {
+    protected int mSubId;
+
+    public TelephonyBasePreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+        mSubId = SubscriptionManager.INVALID_SUBSCRIPTION_ID;
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return MobileNetworkUtils.getAvailability(mContext, mSubId, this::getAvailabilityStatus);
+    }
+}