Fixed data connection state callback not working

The old behavior of onDataConnectionStateChanged callback is that
if at least one data connection for one APN type (e.g. default,
mms, supl, ims, etc...) is connected, then it reports connected.
It only reports disconnected if data for all APN types are
disconnected.

Since now we have data connections are always connected. For example,
even if the user disables data, the unmetered IMS data remains
connected. In this case the client's onDataConnectionStateChanged
won't be called.

Now we changed the behavior of onDataConnectionStateChanged to
report the connection state for default APN type only. This matches
the behavior of TelephonyManager.getDataState().

Test: Manual
Bug: 73226433
Change-Id: I0744cf33337864c946af6e7d186bab78584acfa4
diff --git a/services/core/java/com/android/server/TelephonyRegistry.java b/services/core/java/com/android/server/TelephonyRegistry.java
index 62e82a0..3896871 100644
--- a/services/core/java/com/android/server/TelephonyRegistry.java
+++ b/services/core/java/com/android/server/TelephonyRegistry.java
@@ -65,7 +65,6 @@
 import java.io.FileDescriptor;
 import java.io.PrintWriter;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
 import java.util.NoSuchElementException;
 
@@ -164,14 +163,9 @@
 
     private int[] mDataActivity;
 
+    // Connection state of default APN type data (i.e. internet) of phones
     private int[] mDataConnectionState;
 
-    private ArrayList<String>[] mConnectedApns;
-
-    private LinkProperties[] mDataConnectionLinkProperties;
-
-    private NetworkCapabilities[] mDataConnectionNetworkCapabilities;
-
     private Bundle[] mCellLocation;
 
     private int[] mDataConnectionNetworkType;
@@ -323,9 +317,8 @@
         mBatteryStats = BatteryStatsService.getService();
 
         int numPhones = TelephonyManager.getDefault().getPhoneCount();
-        if (DBG) log("TelephonyRegistor: ctor numPhones=" + numPhones);
+        if (DBG) log("TelephonyRegistry: ctor numPhones=" + numPhones);
         mNumPhones = numPhones;
-        mConnectedApns = new ArrayList[numPhones];
         mCallState = new int[numPhones];
         mDataActivity = new int[numPhones];
         mDataConnectionState = new int[numPhones];
@@ -339,8 +332,6 @@
         mMessageWaiting = new boolean[numPhones];
         mCallForwarding = new boolean[numPhones];
         mCellLocation = new Bundle[numPhones];
-        mDataConnectionLinkProperties = new LinkProperties[numPhones];
-        mDataConnectionNetworkCapabilities = new NetworkCapabilities[numPhones];
         mCellInfo = new ArrayList<List<CellInfo>>();
         mPhysicalChannelConfigs = new ArrayList<List<PhysicalChannelConfig>>();
         for (int i = 0; i < numPhones; i++) {
@@ -358,7 +349,6 @@
             mCellLocation[i] = new Bundle();
             mCellInfo.add(i, null);
             mPhysicalChannelConfigs.add(i, null);
-            mConnectedApns[i] = new ArrayList<String>();
         }
 
         // Note that location can be null for non-phone builds like
@@ -1219,36 +1209,12 @@
         int phoneId = SubscriptionManager.getPhoneId(subId);
         synchronized (mRecords) {
             if (validatePhoneId(phoneId)) {
-                boolean modified = false;
-                if (state == TelephonyManager.DATA_CONNECTED) {
-                    if (!mConnectedApns[phoneId].contains(apnType)) {
-                        mConnectedApns[phoneId].add(apnType);
-                        if (mDataConnectionState[phoneId] != state) {
-                            mDataConnectionState[phoneId] = state;
-                            modified = true;
-                        }
-                    }
-                } else {
-                    if (mConnectedApns[phoneId].remove(apnType)) {
-                        if (mConnectedApns[phoneId].isEmpty()) {
-                            mDataConnectionState[phoneId] = state;
-                            modified = true;
-                        } else {
-                            // leave mDataConnectionState as is and
-                            // send out the new status for the APN in question.
-                        }
-                    }
-                }
-                mDataConnectionLinkProperties[phoneId] = linkProperties;
-                mDataConnectionNetworkCapabilities[phoneId] = networkCapabilities;
-                if (mDataConnectionNetworkType[phoneId] != networkType) {
-                    mDataConnectionNetworkType[phoneId] = networkType;
-                    // need to tell registered listeners about the new network type
-                    modified = true;
-                }
-                if (modified) {
-                    String str = "onDataConnectionStateChanged(" + mDataConnectionState[phoneId]
-                            + ", " + mDataConnectionNetworkType[phoneId] + ")";
+                // We only call the callback when the change is for default APN type.
+                if (PhoneConstants.APN_TYPE_DEFAULT.equals(apnType)
+                        && (mDataConnectionState[phoneId] != state
+                        || mDataConnectionNetworkType[phoneId] != networkType)) {
+                    String str = "onDataConnectionStateChanged(" + state
+                            + ", " + networkType + ")";
                     log(str);
                     mLocalLog.log(str);
                     for (Record r : mRecords) {
@@ -1259,15 +1225,16 @@
                                 if (DBG) {
                                     log("Notify data connection state changed on sub: " + subId);
                                 }
-                                r.callback.onDataConnectionStateChanged(
-                                        mDataConnectionState[phoneId],
-                                        mDataConnectionNetworkType[phoneId]);
+                                r.callback.onDataConnectionStateChanged(state, networkType);
                             } catch (RemoteException ex) {
                                 mRemoveList.add(r.binder);
                             }
                         }
                     }
                     handleRemoveListLocked();
+
+                    mDataConnectionState[phoneId] = state;
+                    mDataConnectionNetworkType[phoneId] = networkType;
                 }
                 mPreciseDataConnectionState = new PreciseDataConnectionState(state, networkType,
                         apnType, apn, reason, linkProperties, "");
@@ -1503,14 +1470,10 @@
                 pw.println("mCallForwarding=" + mCallForwarding[i]);
                 pw.println("mDataActivity=" + mDataActivity[i]);
                 pw.println("mDataConnectionState=" + mDataConnectionState[i]);
-                pw.println("mDataConnectionLinkProperties=" + mDataConnectionLinkProperties[i]);
-                pw.println("mDataConnectionNetworkCapabilities=" +
-                        mDataConnectionNetworkCapabilities[i]);
                 pw.println("mCellLocation=" + mCellLocation[i]);
                 pw.println("mCellInfo=" + mCellInfo.get(i));
                 pw.decreaseIndent();
             }
-            pw.println("mConnectedApns=" + Arrays.toString(mConnectedApns));
             pw.println("mPreciseDataConnectionState=" + mPreciseDataConnectionState);
             pw.println("mPreciseCallState=" + mPreciseCallState);
             pw.println("mCarrierNetworkChangeState=" + mCarrierNetworkChangeState);