Fix the crash when editing or deleting APN.

Previously ApnPrefence starts an intent with URI content://telephony/carrier/filtered/id,
this URI is only implemented in telephony provider for query(), but not
for delete() or update(). This caused the crash when user tries to
update or delete an APN through this URI.

We should let ApnPrefence starts an intent with URI content://telephony/carrier/id, which
is a general telephony URI and all of query() add() delete() update() are implemented for
non-DPC mode. And let ApnPrefence starts an intent with URI content://telephony/carrier/filtered/id
in DPC mode(as the general URI can't access DPC-owned APN), when only DPC-owned APNs are
presented to user. In the DPC mode, user can't update, add or delete an APN, they can
only view(query) the APN, so it won't crash with URI_FILTERED.

Bug: 72387301
Test: manual. Tried update, delete, and add action in Access Point Name page, no crash occurs. Instrumentation test will be added in b/72154761.
Change-Id: I9979cbffcc94a37b2bd96db766ececd0ac7b20e2

src/com/android/settings/ApnPreference.java

@@ -16,6 +16,7 @@
 
 package com.android.settings;
 
+import static android.provider.Telephony.Carriers.CONTENT_URI;
 import static android.provider.Telephony.Carriers.FILTERED_URI;
 
 import android.content.ContentUris;
@@ -36,6 +37,7 @@ import android.widget.RelativeLayout;
 public class ApnPreference extends Preference implements
         CompoundButton.OnCheckedChangeListener, OnClickListener {
     final static String TAG = "ApnPreference";
+    private boolean mDpcEnforced = false;
 
     private int mSubId = SubscriptionManager.INVALID_SUBSCRIPTION_ID;
 
@@ -119,7 +121,8 @@ public class ApnPreference extends Preference implements
             Context context = getContext();
             if (context != null) {
                 int pos = Integer.parseInt(getKey());
-                Uri url = ContentUris.withAppendedId(FILTERED_URI, pos);
+                Uri url = ContentUris.withAppendedId(
+                        mDpcEnforced ? FILTERED_URI : CONTENT_URI, pos);
                 Intent editIntent = new Intent(Intent.ACTION_EDIT, url);
                 editIntent.putExtra(ApnSettings.SUB_ID, mSubId);
                 context.startActivity(editIntent);
@@ -138,4 +141,8 @@ public class ApnPreference extends Preference implements
     public void setSubId(int subId) {
         mSubId = subId;
     }
+
+    public void setDpcEnforced(boolean enforced) {
+        mDpcEnforced = enforced;
+    }
 }

src/com/android/settings/ApnSettings.java

@@ -16,6 +16,7 @@
 
 package com.android.settings;
 
+import static android.provider.Telephony.Carriers.CONTENT_URI;
 import static android.provider.Telephony.Carriers.ENFORCE_MANAGED_URI;
 import static android.provider.Telephony.Carriers.FILTERED_URI;
 
@@ -291,6 +292,7 @@ public class ApnSettings extends RestrictedSettingsFragment implements
 
             mSelectedKey = getSelectedApnKey();
             cursor.moveToFirst();
+            boolean enforced = isDpcApnEnforced();
             while (!cursor.isAfterLast()) {
                 String name = cursor.getString(NAME_INDEX);
                 String apn = cursor.getString(APN_INDEX);
@@ -307,6 +309,7 @@ public class ApnSettings extends RestrictedSettingsFragment implements
                 pref.setPersistent(false);
                 pref.setOnPreferenceChangeListener(this);
                 pref.setSubId(subId);
+                pref.setDpcEnforced(enforced);
 
                 boolean selectable = ((type == null) || !type.equals("mms"));
                 pref.setSelectable(selectable);
@@ -398,7 +401,7 @@ public class ApnSettings extends RestrictedSettingsFragment implements
     @Override
     public boolean onPreferenceTreeClick(Preference preference) {
         int pos = Integer.parseInt(preference.getKey());
-        Uri url = ContentUris.withAppendedId(FILTERED_URI, pos);
+        Uri url = ContentUris.withAppendedId(isDpcApnEnforced() ? FILTERED_URI : CONTENT_URI, pos);
         startActivity(new Intent(Intent.ACTION_EDIT, url));
         return true;
     }