Fix no option after mobile network was reseted.

- When reseting mobile network, subscription info will also be reset.
   It has a racing bewteen showing the UI and udpating the subscription
   info.

 - Register a receiver to receive subscription change to dynamically
   update the UI

Flag: EXEMPT bugfix
Bug: 362382003
Test: Manual test.
Change-Id: I16811503685a6b82eee5ecf3fa725255d356a765

src/com/android/settings/ResetNetwork.java

@@ -18,8 +18,11 @@ package com.android.settings;
 
 import android.app.Activity;
 import android.app.settings.SettingsEnums;
+import android.content.BroadcastReceiver;
 import android.content.ContentResolver;
 import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
 import android.content.res.Resources;
 import android.os.Bundle;
 import android.provider.Settings;
@@ -66,7 +69,7 @@ import java.util.Optional;
  * prompt, followed by a keyguard pattern trace if the user has defined one, followed by a final
  * strongly-worded "THIS WILL RESET EVERYTHING" prompt.  If at any time the phone is allowed to go
  * to sleep, is locked, et cetera, then the confirmation sequence is abandoned.
- *
+ * <p>
  * This is the initial screen.
  */
 public class ResetNetwork extends InstrumentedFragment {
@@ -81,8 +84,20 @@ public class ResetNetwork extends InstrumentedFragment {
     private View mContentView;
     private Spinner mSubscriptionSpinner;
     private Button mInitiateButton;
-    @VisibleForTesting View mEsimContainer;
-    @VisibleForTesting CheckBox mEsimCheckbox;
+    @VisibleForTesting
+    View mEsimContainer;
+    @VisibleForTesting
+    CheckBox mEsimCheckbox;
+
+    private BroadcastReceiver mDefaultSubChangeReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            if (intent.getAction() != SubscriptionManager.ACTION_DEFAULT_SUBSCRIPTION_CHANGED) {
+                return;
+            }
+            establishInitialState(getActiveSubscriptionInfoList());
+        }
+    };
 
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
@@ -97,6 +112,7 @@ public class ResetNetwork extends InstrumentedFragment {
     /**
      * Keyguard validation is run using the standard {@link ConfirmLockPattern}
      * component as a subactivity
+     *
      * @param request the request code to be returned once confirmation finishes
      * @return true if confirmation launched
      */
@@ -139,7 +155,7 @@ public class ResetNetwork extends InstrumentedFragment {
             SubscriptionInfo subscription = mSubscriptions.get(selectedIndex);
             int subId = subscription.getSubscriptionId();
             request.setResetTelephonyAndNetworkPolicyManager(subId)
-                   .setResetApn(subId);
+                    .setResetApn(subId);
             if (Flags.resetMobileNetworkSettings()) {
                 request.setResetImsSubId(subId);
             }
@@ -215,7 +231,6 @@ public class ResetNetwork extends InstrumentedFragment {
             }
 
             int selectedIndex = 0;
-            int size = mSubscriptions.size();
             List<String> subscriptionNames = new ArrayList<>();
             for (SubscriptionInfo record : mSubscriptions) {
                 if (record.getSubscriptionId() == defaultSubscription) {
@@ -281,6 +296,8 @@ public class ResetNetwork extends InstrumentedFragment {
     @Override
     public void onResume() {
         super.onResume();
+        getContext().registerReceiver(mDefaultSubChangeReceiver,
+                new IntentFilter(SubscriptionManager.ACTION_DEFAULT_SUBSCRIPTION_CHANGED));
 
         if (mContentView == null) {
             return;
@@ -297,6 +314,12 @@ public class ResetNetwork extends InstrumentedFragment {
         establishInitialState(updatedSubscriptions);
     }
 
+    @Override
+    public void onPause() {
+        super.onPause();
+        getContext().unregisterReceiver(mDefaultSubChangeReceiver);
+    }
+
     private boolean showEuiccSettings(Context context) {
         if (!SubscriptionUtil.isSimHardwareVisible(context)) {
             return false;