Fix mvno match data is incorrect for APNs

[Cause of Defect]
When user editing an existing apn, ApnPreference won't pass
the subId to ApnEditor.
As a result, if use change the mvno type to 'imsi', ApnEditor
can NOT fetch the correct IMSI due to invalid subId.

[How To Fix]
Pass subId to ApnEditor, which is same as adding new APN.

Bug: 34646368
Test: manual - edited an existing apn
Change-Id: I79fe55ccdeb8dab0ffcc7dfb22ba680beb58b9cd

src/com/android/settings/ApnPreference.java

@@ -23,6 +23,7 @@ import android.net.Uri;
 import android.provider.Telephony;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceViewHolder;
+import android.telephony.SubscriptionManager;
 import android.util.AttributeSet;
 import android.util.Log;
 import android.view.View;
@@ -35,6 +36,8 @@ public class ApnPreference extends Preference implements
         CompoundButton.OnCheckedChangeListener, OnClickListener {
     final static String TAG = "ApnPreference";
 
+    private int mSubId = SubscriptionManager.INVALID_SUBSCRIPTION_ID;
+
     public ApnPreference(Context context, AttributeSet attrs, int defStyle) {
         super(context, attrs, defStyle);
     }
@@ -116,7 +119,9 @@ public class ApnPreference extends Preference implements
             if (context != null) {
                 int pos = Integer.parseInt(getKey());
                 Uri url = ContentUris.withAppendedId(Telephony.Carriers.CONTENT_URI, pos);
-                context.startActivity(new Intent(Intent.ACTION_EDIT, url));
+                Intent editIntent = new Intent(Intent.ACTION_EDIT, url);
+                editIntent.putExtra(ApnSettings.SUB_ID, mSubId);
+                context.startActivity(editIntent);
             }
         }
     }
@@ -128,4 +133,8 @@ public class ApnPreference extends Preference implements
     public boolean getSelectable() {
         return mSelectable;
     }
+
+    public void setSubId(int subId) {
+        mSubId = subId;
+    }
 }