Merge "Implement roaming tracking in NetworkStats summary queries."
diff --git a/core/java/android/app/usage/NetworkStats.java b/core/java/android/app/usage/NetworkStats.java
index 5f97c9e..d263646 100644
--- a/core/java/android/app/usage/NetworkStats.java
+++ b/core/java/android/app/usage/NetworkStats.java
@@ -208,6 +208,15 @@
             return uid;
         }
 
+        private static int convertRoaming(int roaming) {
+            switch (roaming) {
+                case android.net.NetworkStats.ROAMING_ALL : return ROAMING_ALL;
+                case android.net.NetworkStats.ROAMING_DEFAULT : return ROAMING_DEFAULT;
+                case android.net.NetworkStats.ROAMING_ROAMING : return ROAMING_ROAMING;
+            }
+            return 0;
+        }
+
         public Bucket() {
         }
 
@@ -454,9 +463,9 @@
     private void fillBucketFromSummaryEntry(Bucket bucketOut) {
         bucketOut.mUid = Bucket.convertUid(mRecycledSummaryEntry.uid);
         bucketOut.mState = Bucket.convertState(mRecycledSummaryEntry.set);
-        // TODO: Implement metering/roaming tracking.
+        // TODO: Implement metering tracking.
         bucketOut.mMetering = Bucket.METERING_ALL;
-        bucketOut.mRoaming = Bucket.ROAMING_ALL;
+        bucketOut.mRoaming = Bucket.convertRoaming(mRecycledSummaryEntry.roaming);
         bucketOut.mBeginTimeStamp = mStartTimeStamp;
         bucketOut.mEndTimeStamp = mEndTimeStamp;
         bucketOut.mRxBytes = mRecycledSummaryEntry.rxBytes;
diff --git a/core/java/android/app/usage/NetworkStatsManager.java b/core/java/android/app/usage/NetworkStatsManager.java
index 0fce7a9..e8373a1 100644
--- a/core/java/android/app/usage/NetworkStatsManager.java
+++ b/core/java/android/app/usage/NetworkStatsManager.java
@@ -40,16 +40,17 @@
  * {@link #querySummaryForUser} <p />
  * {@link #querySummary} <p />
  * These queries aggregate network usage across the whole interval. Therefore there will be only one
- * bucket for a particular key and state combination. In case of the user-wide and device-wide
- * summaries a single bucket containing the totalised network usage is returned.
+ * bucket for a particular key and state and roaming combination. In case of the user-wide and
+ * device-wide summaries a single bucket containing the totalised network usage is returned.
  * <h3>
  * History queries
  * </h3>
  * {@link #queryDetailsForUid} <p />
  * {@link #queryDetails} <p />
- * These queries do not aggregate over time but do aggregate over state. Therefore there can be
- * multiple buckets for a particular key but all Bucket's state is going to be
- * {@link NetworkStats.Bucket#STATE_ALL}.
+ * These queries do not aggregate over time but do aggregate over state and roaming. Therefore there
+ * can be multiple buckets for a particular key but all Bucket's state is going to be
+ * {@link NetworkStats.Bucket#STATE_ALL} and all Bucket's roaming is going to be
+ * {@link NetworkStats.Bucket#ROAMING_ALL}.
  * <p />
  * <b>NOTE:</b> Accessing stats for apps other than the calling app requires the permission
  * {@link android.Manifest.permission#PACKAGE_USAGE_STATS}, which is a system-level permission and
@@ -81,8 +82,8 @@
      * Query network usage statistics summaries. Result is summarised data usage for the whole
      * device. Result is a single Bucket aggregated over time, state and uid. This means the
      * bucket's start and end timestamp are going to be the same as the 'startTime' and 'endTime'
-     * parameters, state is going to be {@link NetworkStats.Bucket#STATE_ALL} and uid
-     * {@link NetworkStats.Bucket#UID_ALL}.
+     * parameters, state is going to be {@link NetworkStats.Bucket#STATE_ALL}, uid
+     * {@link NetworkStats.Bucket#UID_ALL}, and roaming {@link NetworkStats.Bucket#ROAMING_ALL}.
      *
      * @param networkType As defined in {@link ConnectivityManager}, e.g.
      *            {@link ConnectivityManager#TYPE_MOBILE}, {@link ConnectivityManager#TYPE_WIFI}
@@ -114,8 +115,8 @@
      * Query network usage statistics summaries. Result is summarised data usage for all uids
      * belonging to calling user. Result is a single Bucket aggregated over time, state and uid.
      * This means the bucket's start and end timestamp are going to be the same as the 'startTime'
-     * and 'endTime' parameters, state is going to be {@link NetworkStats.Bucket#STATE_ALL} and uid
-     * {@link NetworkStats.Bucket#UID_ALL}.
+     * and 'endTime' parameters, state is going to be {@link NetworkStats.Bucket#STATE_ALL}, uid
+     * {@link NetworkStats.Bucket#UID_ALL}, and roaming {@link NetworkStats.Bucket#ROAMING_ALL}.
      *
      * @param networkType As defined in {@link ConnectivityManager}, e.g.
      *            {@link ConnectivityManager#TYPE_MOBILE}, {@link ConnectivityManager#TYPE_WIFI}
@@ -146,7 +147,7 @@
     /**
      * Query network usage statistics summaries. Result filtered to include only uids belonging to
      * calling user. Result is aggregated over time, hence all buckets will have the same start and
-     * end timestamps. Not aggregated over state or uid. This means buckets' start and end
+     * end timestamps. Not aggregated over state, uid, or roaming. This means buckets' start and end
      * timestamps are going to be the same as the 'startTime' and 'endTime' parameters, state and
      * uid are going to vary.
      *
@@ -179,7 +180,8 @@
      * Query network usage statistics details. Only usable for uids belonging to calling user.
      * Result is aggregated over state but not aggregated over time. This means buckets' start and
      * end timestamps are going to be between 'startTime' and 'endTime' parameters, state is going
-     * to be {@link NetworkStats.Bucket#STATE_ALL} and uid the same as the 'uid' parameter.
+     * to be {@link NetworkStats.Bucket#STATE_ALL} and uid the same as the 'uid' parameter. roaming
+     * is going to be {@link NetworkStats.Bucket#ROAMING_ALL}.
      * <p>Only includes buckets that atomically occur in the inclusive time range. Doesn't
      * interpolate across partial buckets. Since bucket length is in the order of hours, this
      * method cannot be used to measure data usage on a fine grained time scale.
@@ -215,6 +217,7 @@
      * calling user. Result is aggregated over state but not aggregated over time or uid. This means
      * buckets' start and end timestamps are going to be between 'startTime' and 'endTime'
      * parameters, state is going to be {@link NetworkStats.Bucket#STATE_ALL} and uid will vary.
+     * roaming is going to be {@link NetworkStats.Bucket#ROAMING_ALL}.
      * <p>Only includes buckets that atomically occur in the inclusive time range. Doesn't
      * interpolate across partial buckets. Since bucket length is in the order of hours, this
      * method cannot be used to measure data usage on a fine grained time scale.
diff --git a/core/java/android/net/NetworkStats.java b/core/java/android/net/NetworkStats.java
index 77d7e0c..8919d51 100644
--- a/core/java/android/net/NetworkStats.java
+++ b/core/java/android/net/NetworkStats.java
@@ -50,7 +50,7 @@
     public static final int UID_ALL = -1;
     /** {@link #tag} value matching any tag. */
     public static final int TAG_ALL = -1;
-    /** {@link #set} value when all sets combined, not including debug sets. */
+    /** {@link #set} value for all sets combined, not including debug sets. */
     public static final int SET_ALL = -1;
     /** {@link #set} value where background data is accounted. */
     public static final int SET_DEFAULT = 0;
@@ -66,6 +66,13 @@
     /** {@link #tag} value for total data across all tags. */
     public static final int TAG_NONE = 0;
 
+    /** {@link #set} value for all roaming values. */
+    public static final int ROAMING_ALL = -1;
+    /** {@link #set} value where native, non-roaming data is accounted. */
+    public static final int ROAMING_DEFAULT = 0;
+    /** {@link #set} value where roaming data is accounted. */
+    public static final int ROAMING_ROAMING = 1;
+
     // TODO: move fields to "mVariable" notation
 
     /**
@@ -79,6 +86,7 @@
     private int[] uid;
     private int[] set;
     private int[] tag;
+    private int[] roaming;
     private long[] rxBytes;
     private long[] rxPackets;
     private long[] txBytes;
@@ -90,6 +98,12 @@
         public int uid;
         public int set;
         public int tag;
+        /**
+         * Note that this is only populated w/ the default value when read from /proc or written
+         * to disk. We merge in the correct value when reporting this value to clients of
+         * getSummary().
+         */
+        public int roaming;
         public long rxBytes;
         public long rxPackets;
         public long txBytes;
@@ -107,10 +121,17 @@
 
         public Entry(String iface, int uid, int set, int tag, long rxBytes, long rxPackets,
                 long txBytes, long txPackets, long operations) {
+            this(iface, uid, set, tag, ROAMING_DEFAULT, rxBytes, rxPackets, txBytes, txPackets,
+                    operations);
+        }
+
+        public Entry(String iface, int uid, int set, int tag, int roaming, long rxBytes,
+                long rxPackets, long txBytes, long txPackets, long operations) {
             this.iface = iface;
             this.uid = uid;
             this.set = set;
             this.tag = tag;
+            this.roaming = roaming;
             this.rxBytes = rxBytes;
             this.rxPackets = rxPackets;
             this.txBytes = txBytes;
@@ -142,6 +163,7 @@
             builder.append(" uid=").append(uid);
             builder.append(" set=").append(setToString(set));
             builder.append(" tag=").append(tagToString(tag));
+            builder.append(" roaming=").append(roamingToString(roaming));
             builder.append(" rxBytes=").append(rxBytes);
             builder.append(" rxPackets=").append(rxPackets);
             builder.append(" txBytes=").append(txBytes);
@@ -154,8 +176,8 @@
         public boolean equals(Object o) {
             if (o instanceof Entry) {
                 final Entry e = (Entry) o;
-                return uid == e.uid && set == e.set && tag == e.tag && rxBytes == e.rxBytes
-                        && rxPackets == e.rxPackets && txBytes == e.txBytes
+                return uid == e.uid && set == e.set && tag == e.tag && roaming == e.roaming
+                        && rxBytes == e.rxBytes && rxPackets == e.rxPackets && txBytes == e.txBytes
                         && txPackets == e.txPackets && operations == e.operations
                         && iface.equals(e.iface);
             }
@@ -172,6 +194,7 @@
             this.uid = new int[initialSize];
             this.set = new int[initialSize];
             this.tag = new int[initialSize];
+            this.roaming = new int[initialSize];
             this.rxBytes = new long[initialSize];
             this.rxPackets = new long[initialSize];
             this.txBytes = new long[initialSize];
@@ -184,6 +207,7 @@
             this.uid = EmptyArray.INT;
             this.set = EmptyArray.INT;
             this.tag = EmptyArray.INT;
+            this.roaming = EmptyArray.INT;
             this.rxBytes = EmptyArray.LONG;
             this.rxPackets = EmptyArray.LONG;
             this.txBytes = EmptyArray.LONG;
@@ -200,6 +224,7 @@
         uid = parcel.createIntArray();
         set = parcel.createIntArray();
         tag = parcel.createIntArray();
+        roaming = parcel.createIntArray();
         rxBytes = parcel.createLongArray();
         rxPackets = parcel.createLongArray();
         txBytes = parcel.createLongArray();
@@ -216,6 +241,7 @@
         dest.writeIntArray(uid);
         dest.writeIntArray(set);
         dest.writeIntArray(tag);
+        dest.writeIntArray(roaming);
         dest.writeLongArray(rxBytes);
         dest.writeLongArray(rxPackets);
         dest.writeLongArray(txBytes);
@@ -248,6 +274,13 @@
                 iface, uid, set, tag, rxBytes, rxPackets, txBytes, txPackets, operations));
     }
 
+    @VisibleForTesting
+    public NetworkStats addValues(String iface, int uid, int set, int tag, int roaming,
+            long rxBytes, long rxPackets, long txBytes, long txPackets, long operations) {
+        return addValues(new Entry(
+                iface, uid, set, tag, roaming, rxBytes, rxPackets, txBytes, txPackets, operations));
+    }
+
     /**
      * Add new stats entry, copying from given {@link Entry}. The {@link Entry}
      * object can be recycled across multiple calls.
@@ -259,6 +292,7 @@
             uid = Arrays.copyOf(uid, newLength);
             set = Arrays.copyOf(set, newLength);
             tag = Arrays.copyOf(tag, newLength);
+            roaming = Arrays.copyOf(roaming, newLength);
             rxBytes = Arrays.copyOf(rxBytes, newLength);
             rxPackets = Arrays.copyOf(rxPackets, newLength);
             txBytes = Arrays.copyOf(txBytes, newLength);
@@ -271,6 +305,7 @@
         uid[size] = entry.uid;
         set[size] = entry.set;
         tag[size] = entry.tag;
+        roaming[size] = entry.roaming;
         rxBytes[size] = entry.rxBytes;
         rxPackets[size] = entry.rxPackets;
         txBytes[size] = entry.txBytes;
@@ -290,6 +325,7 @@
         entry.uid = uid[i];
         entry.set = set[i];
         entry.tag = tag[i];
+        entry.roaming = roaming[i];
         entry.rxBytes = rxBytes[i];
         entry.rxPackets = rxPackets[i];
         entry.txBytes = txBytes[i];
@@ -327,22 +363,23 @@
     public NetworkStats combineValues(String iface, int uid, int tag, long rxBytes, long rxPackets,
             long txBytes, long txPackets, long operations) {
         return combineValues(
-                iface, uid, SET_DEFAULT, tag, rxBytes, rxPackets, txBytes, txPackets, operations);
+                iface, uid, SET_DEFAULT, tag, rxBytes, rxPackets, txBytes,
+                txPackets, operations);
     }
 
-    public NetworkStats combineValues(String iface, int uid, int set, int tag, long rxBytes,
-            long rxPackets, long txBytes, long txPackets, long operations) {
+    public NetworkStats combineValues(String iface, int uid, int set, int tag,
+            long rxBytes, long rxPackets, long txBytes, long txPackets, long operations) {
         return combineValues(new Entry(
                 iface, uid, set, tag, rxBytes, rxPackets, txBytes, txPackets, operations));
     }
 
     /**
      * Combine given values with an existing row, or create a new row if
-     * {@link #findIndex(String, int, int, int)} is unable to find match. Can
+     * {@link #findIndex(String, int, int, int, int)} is unable to find match. Can
      * also be used to subtract values from existing rows.
      */
     public NetworkStats combineValues(Entry entry) {
-        final int i = findIndex(entry.iface, entry.uid, entry.set, entry.tag);
+        final int i = findIndex(entry.iface, entry.uid, entry.set, entry.tag, entry.roaming);
         if (i == -1) {
             // only create new entry when positive contribution
             addValues(entry);
@@ -370,10 +407,10 @@
     /**
      * Find first stats index that matches the requested parameters.
      */
-    public int findIndex(String iface, int uid, int set, int tag) {
+    public int findIndex(String iface, int uid, int set, int tag, int roaming) {
         for (int i = 0; i < size; i++) {
             if (uid == this.uid[i] && set == this.set[i] && tag == this.tag[i]
-                    && Objects.equals(iface, this.iface[i])) {
+                    && roaming == this.roaming[i] && Objects.equals(iface, this.iface[i])) {
                 return i;
             }
         }
@@ -385,7 +422,8 @@
      * search around the hinted index as an optimization.
      */
     @VisibleForTesting
-    public int findIndexHinted(String iface, int uid, int set, int tag, int hintIndex) {
+    public int findIndexHinted(String iface, int uid, int set, int tag, int roaming,
+            int hintIndex) {
         for (int offset = 0; offset < size; offset++) {
             final int halfOffset = offset / 2;
 
@@ -398,7 +436,7 @@
             }
 
             if (uid == this.uid[i] && set == this.set[i] && tag == this.tag[i]
-                    && Objects.equals(iface, this.iface[i])) {
+                    && roaming == this.roaming[i] && Objects.equals(iface, this.iface[i])) {
                 return i;
             }
         }
@@ -412,7 +450,7 @@
      */
     public void spliceOperationsFrom(NetworkStats stats) {
         for (int i = 0; i < size; i++) {
-            final int j = stats.findIndex(iface[i], uid[i], set[i], tag[i]);
+            final int j = stats.findIndex(iface[i], uid[i], set[i], tag[i], roaming[i]);
             if (j == -1) {
                 operations[i] = 0;
             } else {
@@ -502,6 +540,7 @@
         entry.uid = limitUid;
         entry.set = SET_ALL;
         entry.tag = TAG_NONE;
+        entry.roaming = ROAMING_ALL;
         entry.rxBytes = 0;
         entry.rxPackets = 0;
         entry.txBytes = 0;
@@ -596,9 +635,11 @@
             entry.uid = left.uid[i];
             entry.set = left.set[i];
             entry.tag = left.tag[i];
+            entry.roaming = left.roaming[i];
 
             // find remote row that matches, and subtract
-            final int j = right.findIndexHinted(entry.iface, entry.uid, entry.set, entry.tag, i);
+            final int j = right.findIndexHinted(entry.iface, entry.uid, entry.set, entry.tag,
+                    entry.roaming, i);
             if (j == -1) {
                 // newly appearing row, return entire value
                 entry.rxBytes = left.rxBytes[i];
@@ -644,6 +685,7 @@
         entry.uid = UID_ALL;
         entry.set = SET_ALL;
         entry.tag = TAG_NONE;
+        entry.roaming = ROAMING_ALL;
         entry.operations = 0L;
 
         for (int i = 0; i < size; i++) {
@@ -672,6 +714,7 @@
         entry.iface = IFACE_ALL;
         entry.set = SET_ALL;
         entry.tag = TAG_NONE;
+        entry.roaming = ROAMING_ALL;
 
         for (int i = 0; i < size; i++) {
             // skip specific tags, since already counted in TAG_NONE
@@ -717,6 +760,7 @@
             pw.print(" uid="); pw.print(uid[i]);
             pw.print(" set="); pw.print(setToString(set[i]));
             pw.print(" tag="); pw.print(tagToString(tag[i]));
+            pw.print(" roaming="); pw.print(roamingToString(roaming[i]));
             pw.print(" rxBytes="); pw.print(rxBytes[i]);
             pw.print(" rxPackets="); pw.print(rxPackets[i]);
             pw.print(" txBytes="); pw.print(txBytes[i]);
@@ -783,6 +827,22 @@
         return "0x" + Integer.toHexString(tag);
     }
 
+    /**
+     * Return text description of {@link #roaming} value.
+     */
+    public static String roamingToString(int roaming) {
+        switch (roaming) {
+            case ROAMING_ALL:
+                return "ALL";
+            case ROAMING_DEFAULT:
+                return "DEFAULT";
+            case ROAMING_ROAMING:
+                return "ROAMING";
+            default:
+                return "UNKNOWN";
+        }
+    }
+
     @Override
     public String toString() {
         final CharArrayWriter writer = new CharArrayWriter();
@@ -932,6 +992,7 @@
                 tmpEntry.uid = uid[i];
                 tmpEntry.tag = tag[i];
                 tmpEntry.set = set[i];
+                tmpEntry.roaming = roaming[i];
                 combineValues(tmpEntry);
                 if (tag[i] == TAG_NONE) {
                     moved.add(tmpEntry);
@@ -950,16 +1011,24 @@
         moved.set = SET_DBG_VPN_OUT;
         moved.tag = TAG_NONE;
         moved.iface = underlyingIface;
+        moved.roaming = ROAMING_ALL;
         combineValues(moved);
 
         // Caveat: if the vpn software uses tag, the total tagged traffic may be greater than
         // the TAG_NONE traffic.
-        int idxVpnBackground = findIndex(underlyingIface, tunUid, SET_DEFAULT, TAG_NONE);
+        //
+        // Relies on the fact that the underlying traffic only has state ROAMING_DEFAULT, which
+        // should be the case as it comes directly from the /proc file. We only blend in the
+        // roaming data after applying these adjustments, by checking the NetworkIdentity of the
+        // underlying iface.
+        int idxVpnBackground = findIndex(underlyingIface, tunUid, SET_DEFAULT, TAG_NONE,
+                ROAMING_DEFAULT);
         if (idxVpnBackground != -1) {
             tunSubtract(idxVpnBackground, this, moved);
         }
 
-        int idxVpnForeground = findIndex(underlyingIface, tunUid, SET_FOREGROUND, TAG_NONE);
+        int idxVpnForeground = findIndex(underlyingIface, tunUid, SET_FOREGROUND, TAG_NONE,
+                ROAMING_DEFAULT);
         if (idxVpnForeground != -1) {
             tunSubtract(idxVpnForeground, this, moved);
         }
diff --git a/core/jni/com_android_internal_net_NetworkStatsFactory.cpp b/core/jni/com_android_internal_net_NetworkStatsFactory.cpp
index 70134ab..9fa90ac 100644
--- a/core/jni/com_android_internal_net_NetworkStatsFactory.cpp
+++ b/core/jni/com_android_internal_net_NetworkStatsFactory.cpp
@@ -43,6 +43,7 @@
     jfieldID uid;
     jfieldID set;
     jfieldID tag;
+    jfieldID roaming;
     jfieldID rxBytes;
     jfieldID rxPackets;
     jfieldID txBytes;
@@ -238,6 +239,9 @@
     ScopedIntArrayRW tag(env, get_int_array(env, stats,
             gNetworkStatsClassInfo.tag, size, grow));
     if (tag.get() == NULL) return -1;
+    ScopedIntArrayRW roaming(env, get_int_array(env, stats,
+            gNetworkStatsClassInfo.roaming, size, grow));
+    if (roaming.get() == NULL) return -1;
     ScopedLongArrayRW rxBytes(env, get_long_array(env, stats,
             gNetworkStatsClassInfo.rxBytes, size, grow));
     if (rxBytes.get() == NULL) return -1;
@@ -261,6 +265,7 @@
         uid[i] = lines[i].uid;
         set[i] = lines[i].set;
         tag[i] = lines[i].tag;
+        // Roaming is populated in Java-land by inspecting the iface properties.
         rxBytes[i] = lines[i].rxBytes;
         rxPackets[i] = lines[i].rxPackets;
         txBytes[i] = lines[i].txBytes;
@@ -274,6 +279,7 @@
         env->SetObjectField(stats, gNetworkStatsClassInfo.uid, uid.getJavaArray());
         env->SetObjectField(stats, gNetworkStatsClassInfo.set, set.getJavaArray());
         env->SetObjectField(stats, gNetworkStatsClassInfo.tag, tag.getJavaArray());
+        env->SetObjectField(stats, gNetworkStatsClassInfo.roaming, roaming.getJavaArray());
         env->SetObjectField(stats, gNetworkStatsClassInfo.rxBytes, rxBytes.getJavaArray());
         env->SetObjectField(stats, gNetworkStatsClassInfo.rxPackets, rxPackets.getJavaArray());
         env->SetObjectField(stats, gNetworkStatsClassInfo.txBytes, txBytes.getJavaArray());
@@ -305,6 +311,7 @@
     gNetworkStatsClassInfo.uid = GetFieldIDOrDie(env, clazz, "uid", "[I");
     gNetworkStatsClassInfo.set = GetFieldIDOrDie(env, clazz, "set", "[I");
     gNetworkStatsClassInfo.tag = GetFieldIDOrDie(env, clazz, "tag", "[I");
+    gNetworkStatsClassInfo.roaming = GetFieldIDOrDie(env, clazz, "roaming", "[I");
     gNetworkStatsClassInfo.rxBytes = GetFieldIDOrDie(env, clazz, "rxBytes", "[J");
     gNetworkStatsClassInfo.rxPackets = GetFieldIDOrDie(env, clazz, "rxPackets", "[J");
     gNetworkStatsClassInfo.txBytes = GetFieldIDOrDie(env, clazz, "txBytes", "[J");
diff --git a/core/tests/coretests/src/android/net/NetworkStatsTest.java b/core/tests/coretests/src/android/net/NetworkStatsTest.java
index a470de1..a723977 100644
--- a/core/tests/coretests/src/android/net/NetworkStatsTest.java
+++ b/core/tests/coretests/src/android/net/NetworkStatsTest.java
@@ -16,6 +16,9 @@
 
 package android.net;
 
+import static android.net.NetworkStats.ROAMING_ALL;
+import static android.net.NetworkStats.ROAMING_DEFAULT;
+import static android.net.NetworkStats.ROAMING_ROAMING;
 import static android.net.NetworkStats.SET_DEFAULT;
 import static android.net.NetworkStats.SET_FOREGROUND;
 import static android.net.NetworkStats.SET_DBG_VPN_IN;
@@ -42,62 +45,103 @@
     private static final long TEST_START = 1194220800000L;
 
     public void testFindIndex() throws Exception {
-        final NetworkStats stats = new NetworkStats(TEST_START, 3)
-                .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, 1024L, 8L, 0L, 0L, 10)
-                .addValues(TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, 0L, 0L, 1024L, 8L, 11)
-                .addValues(TEST_IFACE, 102, SET_DEFAULT, TAG_NONE, 1024L, 8L, 1024L, 8L, 12);
+        final NetworkStats stats = new NetworkStats(TEST_START, 4)
+                .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 1024L, 8L, 0L,
+                        0L, 10)
+                .addValues(TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 0L, 0L, 1024L,
+                        8L, 11)
+                .addValues(TEST_IFACE, 102, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 1024L, 8L,
+                        1024L, 8L, 12)
+                .addValues(TEST_IFACE, 102, SET_DEFAULT, TAG_NONE, ROAMING_ROAMING, 1024L, 8L,
+                        1024L, 8L, 12);
 
-        assertEquals(2, stats.findIndex(TEST_IFACE, 102, SET_DEFAULT, TAG_NONE));
-        assertEquals(2, stats.findIndex(TEST_IFACE, 102, SET_DEFAULT, TAG_NONE));
-        assertEquals(0, stats.findIndex(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE));
-        assertEquals(-1, stats.findIndex(TEST_IFACE, 6, SET_DEFAULT, TAG_NONE));
+        assertEquals(3, stats.findIndex(TEST_IFACE, 102, SET_DEFAULT, TAG_NONE, ROAMING_ROAMING));
+        assertEquals(2, stats.findIndex(TEST_IFACE, 102, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT));
+        assertEquals(1, stats.findIndex(TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT));
+        assertEquals(0, stats.findIndex(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT));
+        assertEquals(-1, stats.findIndex(TEST_IFACE, 6, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT));
     }
 
     public void testFindIndexHinted() {
         final NetworkStats stats = new NetworkStats(TEST_START, 3)
-                .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, 1024L, 8L, 0L, 0L, 10)
-                .addValues(TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, 0L, 0L, 1024L, 8L, 11)
-                .addValues(TEST_IFACE, 102, SET_DEFAULT, TAG_NONE, 1024L, 8L, 1024L, 8L, 12)
-                .addValues(TEST_IFACE2, 100, SET_FOREGROUND, TAG_NONE, 1024L, 8L, 0L, 0L, 10)
-                .addValues(TEST_IFACE2, 101, SET_DEFAULT, 0xF00D, 0L, 0L, 1024L, 8L, 11)
-                .addValues(TEST_IFACE2, 102, SET_DEFAULT, TAG_NONE, 1024L, 8L, 1024L, 8L, 12);
+                .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 1024L, 8L, 0L,
+                        0L, 10)
+                .addValues(TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 0L, 0L, 1024L,
+                        8L, 11)
+                .addValues(TEST_IFACE, 102, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 1024L, 8L,
+                        1024L, 8L, 12)
+                .addValues(TEST_IFACE2, 100, SET_FOREGROUND, TAG_NONE, ROAMING_DEFAULT, 1024L, 8L,
+                        0L, 0L, 10)
+                .addValues(TEST_IFACE2, 101, SET_DEFAULT, 0xF00D, ROAMING_DEFAULT, 0L, 0L, 1024L,
+                        8L, 11)
+                .addValues(TEST_IFACE2, 102, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 1024L, 8L,
+                        1024L, 8L, 12)
+                .addValues(TEST_IFACE2, 102, SET_DEFAULT, TAG_NONE, ROAMING_ROAMING, 1024L, 8L,
+                        1024L, 8L, 12);
 
         // verify that we correctly find across regardless of hinting
         for (int hint = 0; hint < stats.size(); hint++) {
-            assertEquals(0, stats.findIndexHinted(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, hint));
-            assertEquals(1, stats.findIndexHinted(TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, hint));
-            assertEquals(2, stats.findIndexHinted(TEST_IFACE, 102, SET_DEFAULT, TAG_NONE, hint));
-            assertEquals(3, stats.findIndexHinted(TEST_IFACE2, 100, SET_FOREGROUND, TAG_NONE, hint));
-            assertEquals(4, stats.findIndexHinted(TEST_IFACE2, 101, SET_DEFAULT, 0xF00D, hint));
-            assertEquals(5, stats.findIndexHinted(TEST_IFACE2, 102, SET_DEFAULT, TAG_NONE, hint));
-            assertEquals(-1, stats.findIndexHinted(TEST_IFACE, 6, SET_DEFAULT, TAG_NONE, hint));
+            assertEquals(0, stats.findIndexHinted(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE,
+                    ROAMING_DEFAULT, hint));
+            assertEquals(1, stats.findIndexHinted(TEST_IFACE, 101, SET_DEFAULT, TAG_NONE,
+                    ROAMING_DEFAULT, hint));
+            assertEquals(2, stats.findIndexHinted(TEST_IFACE, 102, SET_DEFAULT, TAG_NONE,
+                    ROAMING_DEFAULT, hint));
+            assertEquals(3, stats.findIndexHinted(TEST_IFACE2, 100, SET_FOREGROUND, TAG_NONE,
+                    ROAMING_DEFAULT, hint));
+            assertEquals(4, stats.findIndexHinted(TEST_IFACE2, 101, SET_DEFAULT, 0xF00D,
+                    ROAMING_DEFAULT, hint));
+            assertEquals(5, stats.findIndexHinted(TEST_IFACE2, 102, SET_DEFAULT, TAG_NONE,
+                    ROAMING_DEFAULT, hint));
+            assertEquals(6, stats.findIndexHinted(TEST_IFACE2, 102, SET_DEFAULT, TAG_NONE,
+                    ROAMING_ROAMING, hint));
+            assertEquals(-1, stats.findIndexHinted(TEST_IFACE, 6, SET_DEFAULT, TAG_NONE,
+                    ROAMING_DEFAULT, hint));
         }
     }
 
     public void testAddEntryGrow() throws Exception {
-        final NetworkStats stats = new NetworkStats(TEST_START, 2);
+        final NetworkStats stats = new NetworkStats(TEST_START, 3);
 
         assertEquals(0, stats.size());
-        assertEquals(2, stats.internalSize());
+        assertEquals(3, stats.internalSize());
 
-        stats.addValues(TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, 1L, 1L, 2L, 2L, 3);
-        stats.addValues(TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, 2L, 2L, 2L, 2L, 4);
+        stats.addValues(TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 1L, 1L, 2L,
+                2L, 3);
+        stats.addValues(TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 2L, 2L, 2L,
+                2L, 4);
+        stats.addValues(TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, ROAMING_ROAMING, 3L, 3L, 2L,
+                2L, 5);
 
-        assertEquals(2, stats.size());
-        assertEquals(2, stats.internalSize());
+        assertEquals(3, stats.size());
+        assertEquals(3, stats.internalSize());
 
-        stats.addValues(TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, 3L, 30L, 4L, 40L, 7);
-        stats.addValues(TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, 4L, 40L, 4L, 40L, 8);
-        stats.addValues(TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, 5L, 50L, 5L, 50L, 10);
+        stats.addValues(TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 4L, 40L, 4L,
+                40L, 7);
+        stats.addValues(TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 5L, 50L, 4L,
+                40L, 8);
+        stats.addValues(TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 6L, 60L, 5L,
+                50L, 10);
+        stats.addValues(TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, ROAMING_ROAMING, 7L, 70L, 5L,
+                50L, 11);
 
-        assertEquals(5, stats.size());
-        assertTrue(stats.internalSize() >= 5);
+        assertEquals(7, stats.size());
+        assertTrue(stats.internalSize() >= 7);
 
-        assertValues(stats, 0, TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, 1L, 1L, 2L, 2L, 3);
-        assertValues(stats, 1, TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, 2L, 2L, 2L, 2L, 4);
-        assertValues(stats, 2, TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, 3L, 30L, 4L, 40L, 7);
-        assertValues(stats, 3, TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, 4L, 40L, 4L, 40L, 8);
-        assertValues(stats, 4, TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, 5L, 50L, 5L, 50L, 10);
+        assertValues(stats, 0, TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 1L, 1L,
+                2L, 2L, 3);
+        assertValues(stats, 1, TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 2L, 2L,
+                2L, 2L, 4);
+        assertValues(stats, 2, TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, ROAMING_ROAMING, 3L, 3L,
+                2L, 2L, 5);
+        assertValues(stats, 3, TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 4L,
+                40L, 4L, 40L, 7);
+        assertValues(stats, 4, TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 5L,
+                50L, 4L, 40L, 8);
+        assertValues(stats, 5, TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 6L,
+                60L, 5L, 50L, 10);
+        assertValues(stats, 6, TEST_IFACE, TEST_UID, SET_DEFAULT, TAG_NONE, ROAMING_ROAMING, 7L,
+                70L, 5L, 50L, 11);
     }
 
     public void testCombineExisting() throws Exception {
@@ -105,16 +149,23 @@
 
         stats.addValues(TEST_IFACE, 1001, SET_DEFAULT, TAG_NONE, 512L, 4L, 256L, 2L, 10);
         stats.addValues(TEST_IFACE, 1001, SET_DEFAULT, 0xff, 128L, 1L, 128L, 1L, 2);
-        stats.combineValues(TEST_IFACE, 1001, SET_DEFAULT, TAG_NONE, -128L, -1L, -128L, -1L, -1);
+        stats.combineValues(TEST_IFACE, 1001, SET_DEFAULT, TAG_NONE, -128L, -1L,
+                -128L, -1L, -1);
 
-        assertValues(stats, 0, TEST_IFACE, 1001, SET_DEFAULT, TAG_NONE, 384L, 3L, 128L, 1L, 9);
-        assertValues(stats, 1, TEST_IFACE, 1001, SET_DEFAULT, 0xff, 128L, 1L, 128L, 1L, 2);
+        assertValues(stats, 0, TEST_IFACE, 1001, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 384L, 3L,
+                128L, 1L, 9);
+        assertValues(stats, 1, TEST_IFACE, 1001, SET_DEFAULT, 0xff, ROAMING_DEFAULT, 128L, 1L, 128L,
+                1L, 2);
 
         // now try combining that should create row
-        stats.combineValues(TEST_IFACE, 5005, SET_DEFAULT, TAG_NONE, 128L, 1L, 128L, 1L, 3);
-        assertValues(stats, 2, TEST_IFACE, 5005, SET_DEFAULT, TAG_NONE, 128L, 1L, 128L, 1L, 3);
-        stats.combineValues(TEST_IFACE, 5005, SET_DEFAULT, TAG_NONE, 128L, 1L, 128L, 1L, 3);
-        assertValues(stats, 2, TEST_IFACE, 5005, SET_DEFAULT, TAG_NONE, 256L, 2L, 256L, 2L, 6);
+        stats.combineValues(TEST_IFACE, 5005, SET_DEFAULT, TAG_NONE, 128L, 1L,
+                128L, 1L, 3);
+        assertValues(stats, 2, TEST_IFACE, 5005, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 128L, 1L,
+                128L, 1L, 3);
+        stats.combineValues(TEST_IFACE, 5005, SET_DEFAULT, TAG_NONE, 128L, 1L,
+                128L, 1L, 3);
+        assertValues(stats, 2, TEST_IFACE, 5005, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 256L, 2L,
+                256L, 2L, 6);
     }
 
     public void testSubtractIdenticalData() throws Exception {
@@ -129,8 +180,10 @@
         final NetworkStats result = after.subtract(before);
 
         // identical data should result in zero delta
-        assertValues(result, 0, TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, 0L, 0L, 0L, 0L, 0);
-        assertValues(result, 1, TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, 0L, 0L, 0L, 0L, 0);
+        assertValues(result, 0, TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 0L, 0L, 0L,
+                0L, 0);
+        assertValues(result, 1, TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 0L, 0L, 0L,
+                0L, 0);
     }
 
     public void testSubtractIdenticalRows() throws Exception {
@@ -145,8 +198,10 @@
         final NetworkStats result = after.subtract(before);
 
         // expect delta between measurements
-        assertValues(result, 0, TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, 1L, 1L, 2L, 1L, 4);
-        assertValues(result, 1, TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, 3L, 1L, 4L, 1L, 8);
+        assertValues(result, 0, TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 1L, 1L, 2L,
+                1L, 4);
+        assertValues(result, 1, TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 3L, 1L, 4L,
+                1L, 8);
     }
 
     public void testSubtractNewRows() throws Exception {
@@ -162,9 +217,12 @@
         final NetworkStats result = after.subtract(before);
 
         // its okay to have new rows
-        assertValues(result, 0, TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, 0L, 0L, 0L, 0L, 0);
-        assertValues(result, 1, TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, 0L, 0L, 0L, 0L, 0);
-        assertValues(result, 2, TEST_IFACE, 102, SET_DEFAULT, TAG_NONE, 1024L, 8L, 1024L, 8L, 20);
+        assertValues(result, 0, TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 0L, 0L, 0L,
+                0L, 0);
+        assertValues(result, 1, TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 0L, 0L, 0L,
+                0L, 0);
+        assertValues(result, 2, TEST_IFACE, 102, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 1024L, 8L,
+                1024L, 8L, 20);
     }
 
     public void testSubtractMissingRows() throws Exception {
@@ -179,7 +237,8 @@
 
         // should silently drop omitted rows
         assertEquals(1, result.size());
-        assertValues(result, 0, TEST_IFACE2, UID_ALL, SET_DEFAULT, TAG_NONE, 1L, 2L, 3L, 4L, 0);
+        assertValues(result, 0, TEST_IFACE2, UID_ALL, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 1L,
+                2L, 3L, 4L, 0);
         assertEquals(4L, result.getTotalBytes());
     }
 
@@ -195,7 +254,7 @@
                 .addValues(TEST_IFACE, 101, SET_FOREGROUND, TAG_NONE, 32L, 0L, 0L, 0L, 0L);
         assertEquals(96L, uidSet.getTotalBytes());
 
-        final NetworkStats uidTag = new NetworkStats(TEST_START, 3)
+        final NetworkStats uidTag = new NetworkStats(TEST_START, 6)
                 .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, 16L, 0L, 0L, 0L, 0L)
                 .addValues(TEST_IFACE2, 100, SET_DEFAULT, TAG_NONE, 16L, 0L, 0L, 0L, 0L)
                 .addValues(TEST_IFACE2, 100, SET_DEFAULT, 0xF00D, 8L, 0L, 0L, 0L, 0L)
@@ -203,6 +262,15 @@
                 .addValues(TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, 16L, 0L, 0L, 0L, 0L)
                 .addValues(TEST_IFACE, 101, SET_DEFAULT, 0xF00D, 8L, 0L, 0L, 0L, 0L);
         assertEquals(64L, uidTag.getTotalBytes());
+
+        final NetworkStats uidRoaming = new NetworkStats(TEST_START, 3)
+                .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 32L, 0L, 0L, 0L,
+                        0L)
+                .addValues(TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 32L, 0L, 0L, 0L,
+                        0L)
+                .addValues(TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, ROAMING_ROAMING, 32L, 0L, 0L, 0L,
+                        0L);
+        assertEquals(96L, uidRoaming.getTotalBytes());
     }
 
     public void testGroupedByIfaceEmpty() throws Exception {
@@ -215,62 +283,98 @@
 
     public void testGroupedByIfaceAll() throws Exception {
         final NetworkStats uidStats = new NetworkStats(TEST_START, 3)
-                .addValues(IFACE_ALL, 100, SET_ALL, TAG_NONE, 128L, 8L, 0L, 2L, 20L)
-                .addValues(IFACE_ALL, 101, SET_FOREGROUND, TAG_NONE, 128L, 8L, 0L, 2L, 20L);
+                .addValues(IFACE_ALL, 100, SET_ALL, TAG_NONE, ROAMING_DEFAULT, 128L, 8L, 0L, 2L,
+                        20L)
+                .addValues(IFACE_ALL, 101, SET_FOREGROUND, TAG_NONE, ROAMING_DEFAULT, 128L, 8L, 0L,
+                        2L, 20L)
+                .addValues(IFACE_ALL, 101, SET_ALL, TAG_NONE, ROAMING_ROAMING, 128L, 8L, 0L, 2L,
+                        20L);
         final NetworkStats grouped = uidStats.groupedByIface();
 
-        assertEquals(2, uidStats.size());
+        assertEquals(3, uidStats.size());
         assertEquals(1, grouped.size());
 
-        assertValues(grouped, 0, IFACE_ALL, UID_ALL, SET_ALL, TAG_NONE, 256L, 16L, 0L, 4L, 0L);
+        assertValues(grouped, 0, IFACE_ALL, UID_ALL, SET_ALL, TAG_NONE, ROAMING_ALL, 384L, 24L, 0L,
+                6L, 0L);
     }
 
     public void testGroupedByIface() throws Exception {
-        final NetworkStats uidStats = new NetworkStats(TEST_START, 3)
-                .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, 128L, 8L, 0L, 2L, 20L)
-                .addValues(TEST_IFACE2, 100, SET_DEFAULT, TAG_NONE, 512L, 32L, 0L, 0L, 0L)
-                .addValues(TEST_IFACE2, 100, SET_DEFAULT, 0xF00D, 64L, 4L, 0L, 0L, 0L)
-                .addValues(TEST_IFACE2, 100, SET_FOREGROUND, TAG_NONE, 512L, 32L, 0L, 0L, 0L)
-                .addValues(TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, 128L, 8L, 0L, 0L, 0L)
-                .addValues(TEST_IFACE, 101, SET_DEFAULT, 0xF00D, 128L, 8L, 0L, 0L, 0L);
+        final NetworkStats uidStats = new NetworkStats(TEST_START, 7)
+                .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 128L, 8L, 0L,
+                        2L, 20L)
+                .addValues(TEST_IFACE2, 100, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 512L, 32L, 0L,
+                        0L, 0L)
+                .addValues(TEST_IFACE2, 100, SET_DEFAULT, 0xF00D, ROAMING_DEFAULT, 64L, 4L, 0L, 0L,
+                        0L)
+                .addValues(TEST_IFACE2, 100, SET_FOREGROUND, TAG_NONE, ROAMING_DEFAULT, 512L, 32L,
+                        0L, 0L, 0L)
+                .addValues(TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 128L, 8L, 0L,
+                        0L, 0L)
+                .addValues(TEST_IFACE, 101, SET_DEFAULT, 0xF00D, ROAMING_DEFAULT, 128L, 8L, 0L, 0L,
+                        0L)
+                .addValues(TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, ROAMING_ROAMING, 128L, 8L, 0L,
+                        0L, 0L);
 
         final NetworkStats grouped = uidStats.groupedByIface();
 
-        assertEquals(6, uidStats.size());
+        assertEquals(7, uidStats.size());
 
         assertEquals(2, grouped.size());
-        assertValues(grouped, 0, TEST_IFACE, UID_ALL, SET_ALL, TAG_NONE, 256L, 16L, 0L, 2L, 0L);
-        assertValues(grouped, 1, TEST_IFACE2, UID_ALL, SET_ALL, TAG_NONE, 1024L, 64L, 0L, 0L, 0L);
+        assertValues(grouped, 0, TEST_IFACE, UID_ALL, SET_ALL, TAG_NONE, ROAMING_ALL, 384L, 24L, 0L,
+                2L, 0L);
+        assertValues(grouped, 1, TEST_IFACE2, UID_ALL, SET_ALL, TAG_NONE, ROAMING_ALL, 1024L, 64L,
+                0L, 0L, 0L);
     }
 
     public void testAddAllValues() {
         final NetworkStats first = new NetworkStats(TEST_START, 5)
-                .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, 32L, 0L, 0L, 0L, 0L)
-                .addValues(TEST_IFACE, 100, SET_FOREGROUND, TAG_NONE, 32L, 0L, 0L, 0L, 0L);
+                .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 32L, 0L, 0L, 0L,
+                        0L)
+                .addValues(TEST_IFACE, 100, SET_FOREGROUND, TAG_NONE, ROAMING_DEFAULT, 32L, 0L, 0L,
+                        0L, 0L)
+                .addValues(TEST_IFACE, 100, SET_FOREGROUND, TAG_NONE, ROAMING_ROAMING, 32L, 0L, 0L,
+                        0L, 0L);
 
         final NetworkStats second = new NetworkStats(TEST_START, 2)
-                .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, 32L, 0L, 0L, 0L, 0L)
-                .addValues(TEST_IFACE2, UID_ALL, SET_DEFAULT, TAG_NONE, 32L, 0L, 0L, 0L, 0L);
+                .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 32L, 0L, 0L, 0L,
+                        0L)
+                .addValues(TEST_IFACE2, UID_ALL, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 32L, 0L,
+                        0L, 0L, 0L)
+                .addValues(TEST_IFACE, 100, SET_FOREGROUND, TAG_NONE, ROAMING_ROAMING, 32L, 0L, 0L,
+                        0L, 0L);
 
         first.combineAllValues(second);
 
-        assertEquals(3, first.size());
-        assertValues(first, 0, TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, 64L, 0L, 0L, 0L, 0L);
-        assertValues(first, 1, TEST_IFACE, 100, SET_FOREGROUND, TAG_NONE, 32L, 0L, 0L, 0L, 0L);
-        assertValues(first, 2, TEST_IFACE2, UID_ALL, SET_DEFAULT, TAG_NONE, 32L, 0L, 0L, 0L, 0L);
+        assertEquals(4, first.size());
+        assertValues(first, 0, TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 64L, 0L, 0L,
+                0L, 0L);
+        assertValues(first, 1, TEST_IFACE, 100, SET_FOREGROUND, TAG_NONE, ROAMING_DEFAULT, 32L, 0L,
+                0L, 0L, 0L);
+        assertValues(first, 2, TEST_IFACE, 100, SET_FOREGROUND, TAG_NONE, ROAMING_ROAMING, 64L, 0L,
+                0L, 0L, 0L);
+        assertValues(first, 3, TEST_IFACE2, UID_ALL, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 32L,
+                0L, 0L, 0L, 0L);
     }
 
     public void testGetTotal() {
-        final NetworkStats stats = new NetworkStats(TEST_START, 3)
-                .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, 128L, 8L, 0L, 2L, 20L)
-                .addValues(TEST_IFACE2, 100, SET_DEFAULT, TAG_NONE, 512L, 32L, 0L, 0L, 0L)
-                .addValues(TEST_IFACE2, 100, SET_DEFAULT, 0xF00D, 64L, 4L, 0L, 0L, 0L)
-                .addValues(TEST_IFACE2, 100, SET_FOREGROUND, TAG_NONE, 512L, 32L, 0L, 0L, 0L)
-                .addValues(TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, 128L, 8L, 0L, 0L, 0L)
-                .addValues(TEST_IFACE, 101, SET_DEFAULT, 0xF00D, 128L, 8L, 0L, 0L, 0L);
+        final NetworkStats stats = new NetworkStats(TEST_START, 7)
+                .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 128L, 8L, 0L,
+                        2L, 20L)
+                .addValues(TEST_IFACE2, 100, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 512L, 32L, 0L,
+                        0L, 0L)
+                .addValues(TEST_IFACE2, 100, SET_DEFAULT, 0xF00D, ROAMING_DEFAULT, 64L, 4L, 0L, 0L,
+                        0L)
+                .addValues(TEST_IFACE2, 100, SET_FOREGROUND, TAG_NONE, ROAMING_DEFAULT, 512L, 32L,
+                        0L, 0L, 0L)
+                .addValues(TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 128L, 8L, 0L,
+                        0L, 0L)
+                .addValues(TEST_IFACE, 101, SET_DEFAULT, 0xF00D, ROAMING_DEFAULT, 128L, 8L, 0L, 0L,
+                        0L)
+                .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, ROAMING_ROAMING, 128L, 8L, 0L,
+                        0L, 0L);
 
-        assertValues(stats.getTotal(null), 1280L, 80L, 0L, 2L, 20L);
-        assertValues(stats.getTotal(null, 100), 1152L, 72L, 0L, 2L, 20L);
+        assertValues(stats.getTotal(null), 1408L, 88L, 0L, 2L, 20L);
+        assertValues(stats.getTotal(null, 100), 1280L, 80L, 0L, 2L, 20L);
         assertValues(stats.getTotal(null, 101), 128L, 8L, 0L, 0L, 0L);
 
         final HashSet<String> ifaces = Sets.newHashSet();
@@ -292,8 +396,10 @@
         final NetworkStats after = before.withoutUids(new int[] { 100 });
         assertEquals(6, before.size());
         assertEquals(2, after.size());
-        assertValues(after, 0, TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, 128L, 8L, 0L, 0L, 0L);
-        assertValues(after, 1, TEST_IFACE, 101, SET_DEFAULT, 0xF00D, 128L, 8L, 0L, 0L, 0L);
+        assertValues(after, 0, TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 128L, 8L,
+                0L, 0L, 0L);
+        assertValues(after, 1, TEST_IFACE, 101, SET_DEFAULT, 0xF00D, ROAMING_DEFAULT, 128L, 8L, 0L,
+                0L, 0L);
     }
 
     public void testClone() throws Exception {
@@ -351,76 +457,83 @@
         assertEquals(21, delta.size());
 
         // tunIface and TEST_IFACE entries are not changed.
-        assertValues(delta, 0, tunIface, 10100, SET_DEFAULT, TAG_NONE,
+        assertValues(delta, 0, tunIface, 10100, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT,
                 39605L, 46L, 12259L, 55L, 0L);
-        assertValues(delta, 1, tunIface, 10100, SET_FOREGROUND, TAG_NONE, 0L, 0L, 0L, 0L, 0L);
-        assertValues(delta, 2, tunIface, 10120, SET_DEFAULT, TAG_NONE,
+        assertValues(delta, 1, tunIface, 10100, SET_FOREGROUND, TAG_NONE,  ROAMING_DEFAULT, 0L, 0L,
+                0L, 0L, 0L);
+        assertValues(delta, 2, tunIface, 10120, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT,
                 72667L, 197L, 43909L, 241L, 0L);
-        assertValues(delta, 3, tunIface, 10120, SET_FOREGROUND, TAG_NONE,
+        assertValues(delta, 3, tunIface, 10120, SET_FOREGROUND, TAG_NONE, ROAMING_DEFAULT,
                 9297L, 17L, 4128L, 21L, 0L);
-        assertValues(delta, 4, tunIface, tunUid, SET_DEFAULT, TAG_NONE,
+        assertValues(delta, 4, tunIface, tunUid, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT,
                 4983L, 10L, 1801L, 12L, 0L);
-        assertValues(delta, 5, tunIface, tunUid, SET_FOREGROUND, TAG_NONE, 0L, 0L, 0L, 0L, 0L);
-        assertValues(delta, 6, tunIface, 10120, SET_DEFAULT, testTag1,
+        assertValues(delta, 5, tunIface, tunUid, SET_FOREGROUND, TAG_NONE, ROAMING_DEFAULT, 0L, 0L,
+                0L, 0L, 0L);
+        assertValues(delta, 6, tunIface, 10120, SET_DEFAULT, testTag1, ROAMING_DEFAULT,
                 21691L, 41L, 13820L, 51L, 0L);
-        assertValues(delta, 7, tunIface, 10120, SET_FOREGROUND, testTag1, 1281L, 2L, 665L, 2L, 0L);
-        assertValues(delta, 8, TEST_IFACE, 10100, SET_DEFAULT, TAG_NONE, 1685L, 5L, 2070L, 6L, 0L);
+        assertValues(delta, 7, tunIface, 10120, SET_FOREGROUND, testTag1, ROAMING_DEFAULT, 1281L,
+                2L, 665L, 2L, 0L);
+        assertValues(delta, 8, TEST_IFACE, 10100, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 1685L, 5L,
+                2070L, 6L, 0L);
 
         // Existing underlying Iface entries are updated
-        assertValues(delta, 9, underlyingIface, 10100, SET_DEFAULT, TAG_NONE,
+        assertValues(delta, 9, underlyingIface, 10100, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT,
                 44783L, 54L, 13829L, 60L, 0L);
-        assertValues(delta, 10, underlyingIface, 10100, SET_FOREGROUND, TAG_NONE,
+        assertValues(delta, 10, underlyingIface, 10100, SET_FOREGROUND, TAG_NONE, ROAMING_DEFAULT,
                 0L, 0L, 0L, 0L, 0L);
 
         // VPN underlying Iface entries are updated
-        assertValues(delta, 11, underlyingIface, tunUid, SET_DEFAULT, TAG_NONE,
+        assertValues(delta, 11, underlyingIface, tunUid, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT,
                 28304L, 27L, 1719L, 12L, 0L);
-        assertValues(delta, 12, underlyingIface, tunUid, SET_FOREGROUND, TAG_NONE,
+        assertValues(delta, 12, underlyingIface, tunUid, SET_FOREGROUND, TAG_NONE, ROAMING_DEFAULT,
                 0L, 0L, 0L, 0L, 0L);
 
         // New entries are added for new application's underlying Iface traffic
-        assertContains(delta, underlyingIface, 10120, SET_DEFAULT, TAG_NONE,
-                72667L, 197L, 41872l, 219L, 0L);
-        assertContains(delta, underlyingIface, 10120, SET_FOREGROUND, TAG_NONE,
+        assertContains(delta, underlyingIface, 10120, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT,
+                72667L, 197L, 41872L, 219L, 0L);
+        assertContains(delta, underlyingIface, 10120, SET_FOREGROUND, TAG_NONE, ROAMING_DEFAULT,
                 9297L, 17L, 3936, 19L, 0L);
-        assertContains(delta, underlyingIface, 10120, SET_DEFAULT, testTag1,
+        assertContains(delta, underlyingIface, 10120, SET_DEFAULT, testTag1, ROAMING_DEFAULT,
                 21691L, 41L, 13179L, 46L, 0L);
-        assertContains(delta, underlyingIface, 10120, SET_FOREGROUND, testTag1,
+        assertContains(delta, underlyingIface, 10120, SET_FOREGROUND, testTag1, ROAMING_DEFAULT,
                 1281L, 2L, 634L, 1L, 0L);
 
         // New entries are added for debug purpose
-        assertContains(delta, underlyingIface, 10100, SET_DBG_VPN_IN, TAG_NONE,
+        assertContains(delta, underlyingIface, 10100, SET_DBG_VPN_IN, TAG_NONE, ROAMING_DEFAULT,
                 39605L, 46L, 11690, 49, 0);
-        assertContains(delta, underlyingIface, 10120, SET_DBG_VPN_IN, TAG_NONE,
+        assertContains(delta, underlyingIface, 10120, SET_DBG_VPN_IN, TAG_NONE, ROAMING_DEFAULT,
                 81964, 214, 45808, 238, 0);
-        assertContains(delta, underlyingIface, tunUid, SET_DBG_VPN_IN, TAG_NONE,
+        assertContains(delta, underlyingIface, tunUid, SET_DBG_VPN_IN, TAG_NONE, ROAMING_DEFAULT,
                 4983, 10, 1717, 10, 0);
-        assertContains(delta, underlyingIface, tunUid, SET_DBG_VPN_OUT, TAG_NONE,
+        assertContains(delta, underlyingIface, tunUid, SET_DBG_VPN_OUT, TAG_NONE, ROAMING_ALL,
                 126552, 270, 59215, 297, 0);
 
     }
 
     private static void assertContains(NetworkStats stats,  String iface, int uid, int set,
-            int tag, long rxBytes, long rxPackets, long txBytes, long txPackets, long operations) {
-        int index = stats.findIndex(iface, uid, set, tag);
+            int tag, int roaming, long rxBytes, long rxPackets, long txBytes, long txPackets,
+            long operations) {
+        int index = stats.findIndex(iface, uid, set, tag, roaming);
         assertTrue(index != -1);
-        assertValues(stats, index, iface, uid, set, tag,
+        assertValues(stats, index, iface, uid, set, tag, roaming,
                 rxBytes, rxPackets, txBytes, txPackets, operations);
     }
 
     private static void assertValues(NetworkStats stats, int index, String iface, int uid, int set,
-            int tag, long rxBytes, long rxPackets, long txBytes, long txPackets, long operations) {
+            int tag, int roaming, long rxBytes, long rxPackets, long txBytes, long txPackets,
+            long operations) {
         final NetworkStats.Entry entry = stats.getValues(index, null);
-        assertValues(entry, iface, uid, set, tag);
+        assertValues(entry, iface, uid, set, tag, roaming);
         assertValues(entry, rxBytes, rxPackets, txBytes, txPackets, operations);
     }
 
     private static void assertValues(
-            NetworkStats.Entry entry, String iface, int uid, int set, int tag) {
+            NetworkStats.Entry entry, String iface, int uid, int set, int tag, int roaming) {
         assertEquals(iface, entry.iface);
         assertEquals(uid, entry.uid);
         assertEquals(set, entry.set);
         assertEquals(tag, entry.tag);
+        assertEquals(roaming, entry.roaming);
     }
 
     private static void assertValues(NetworkStats.Entry entry, long rxBytes, long rxPackets,
diff --git a/core/tests/coretests/src/com/android/internal/net/NetworkStatsFactoryTest.java b/core/tests/coretests/src/com/android/internal/net/NetworkStatsFactoryTest.java
index d3dd01a..12a75b8 100644
--- a/core/tests/coretests/src/com/android/internal/net/NetworkStatsFactoryTest.java
+++ b/core/tests/coretests/src/com/android/internal/net/NetworkStatsFactoryTest.java
@@ -16,6 +16,7 @@
 
 package com.android.internal.net;
 
+import static android.net.NetworkStats.ROAMING_DEFAULT;
 import static android.net.NetworkStats.SET_ALL;
 import static android.net.NetworkStats.SET_DEFAULT;
 import static android.net.NetworkStats.SET_FOREGROUND;
@@ -156,7 +157,7 @@
 
     private static void assertStatsEntry(NetworkStats stats, String iface, int uid, int set,
             int tag, long rxBytes, long txBytes) {
-        final int i = stats.findIndex(iface, uid, set, tag);
+        final int i = stats.findIndex(iface, uid, set, tag, ROAMING_DEFAULT);
         final NetworkStats.Entry entry = stats.getValues(i, null);
         assertEquals("unexpected rxBytes", rxBytes, entry.rxBytes);
         assertEquals("unexpected txBytes", txBytes, entry.txBytes);
@@ -164,7 +165,7 @@
 
     private static void assertStatsEntry(NetworkStats stats, String iface, int uid, int set,
             int tag, long rxBytes, long rxPackets, long txBytes, long txPackets) {
-        final int i = stats.findIndex(iface, uid, set, tag);
+        final int i = stats.findIndex(iface, uid, set, tag, ROAMING_DEFAULT);
         final NetworkStats.Entry entry = stats.getValues(i, null);
         assertEquals("unexpected rxBytes", rxBytes, entry.rxBytes);
         assertEquals("unexpected rxPackets", rxPackets, entry.rxPackets);
diff --git a/services/core/java/com/android/server/net/NetworkIdentitySet.java b/services/core/java/com/android/server/net/NetworkIdentitySet.java
index f230bb3..68dc715 100644
--- a/services/core/java/com/android/server/net/NetworkIdentitySet.java
+++ b/services/core/java/com/android/server/net/NetworkIdentitySet.java
@@ -61,7 +61,7 @@
                 roaming = false;
             }
 
-            add(new NetworkIdentity(type, subType, subscriberId, networkId, false));
+            add(new NetworkIdentity(type, subType, subscriberId, networkId, roaming));
         }
     }
 
@@ -77,6 +77,19 @@
         }
     }
 
+    /** @return whether any {@link NetworkIdentity} in this set is considered roaming. */
+    public boolean isAnyMemberRoaming() {
+        if (isEmpty()) {
+            return false;
+        }
+        for (NetworkIdentity ident : this) {
+            if (ident.getRoaming()) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     private static void writeOptionalString(DataOutputStream out, String value) throws IOException {
         if (value != null) {
             out.writeByte(1);
diff --git a/services/core/java/com/android/server/net/NetworkStatsCollection.java b/services/core/java/com/android/server/net/NetworkStatsCollection.java
index 102695e..eec7d93 100644
--- a/services/core/java/com/android/server/net/NetworkStatsCollection.java
+++ b/services/core/java/com/android/server/net/NetworkStatsCollection.java
@@ -17,6 +17,8 @@
 package com.android.server.net;
 
 import static android.net.NetworkStats.IFACE_ALL;
+import static android.net.NetworkStats.ROAMING_DEFAULT;
+import static android.net.NetworkStats.ROAMING_ROAMING;
 import static android.net.NetworkStats.SET_ALL;
 import static android.net.NetworkStats.SET_DEFAULT;
 import static android.net.NetworkStats.TAG_NONE;
@@ -218,6 +220,7 @@
                 entry.uid = key.uid;
                 entry.set = key.set;
                 entry.tag = key.tag;
+                entry.roaming = key.ident.isAnyMemberRoaming() ? ROAMING_ROAMING : ROAMING_DEFAULT;
                 entry.rxBytes = historyEntry.rxBytes;
                 entry.rxPackets = historyEntry.rxPackets;
                 entry.txBytes = historyEntry.txBytes;
diff --git a/services/tests/servicestests/src/com/android/server/NetworkStatsServiceTest.java b/services/tests/servicestests/src/com/android/server/NetworkStatsServiceTest.java
index 204bc2e..8cbd32d 100644
--- a/services/tests/servicestests/src/com/android/server/NetworkStatsServiceTest.java
+++ b/services/tests/servicestests/src/com/android/server/NetworkStatsServiceTest.java
@@ -22,6 +22,9 @@
 import static android.net.ConnectivityManager.TYPE_WIFI;
 import static android.net.ConnectivityManager.TYPE_WIMAX;
 import static android.net.NetworkStats.IFACE_ALL;
+import static android.net.NetworkStats.ROAMING_ALL;
+import static android.net.NetworkStats.ROAMING_DEFAULT;
+import static android.net.NetworkStats.ROAMING_ROAMING;
 import static android.net.NetworkStats.SET_ALL;
 import static android.net.NetworkStats.SET_DEFAULT;
 import static android.net.NetworkStats.SET_FOREGROUND;
@@ -81,6 +84,8 @@
 import org.easymock.EasyMock;
 
 import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
 
 /**
  * Tests for {@link NetworkStatsService}.
@@ -282,8 +287,9 @@
         // verify service recorded history
         assertNetworkTotal(sTemplateWifi, 1024L, 8L, 2048L, 16L, 0);
         assertUidTotal(sTemplateWifi, UID_RED, 1024L, 8L, 512L, 4L, 10);
-        assertUidTotal(sTemplateWifi, UID_RED, SET_DEFAULT, 512L, 4L, 256L, 2L, 4);
-        assertUidTotal(sTemplateWifi, UID_RED, SET_FOREGROUND, 512L, 4L, 256L, 2L, 6);
+        assertUidTotal(sTemplateWifi, UID_RED, SET_DEFAULT, ROAMING_DEFAULT, 512L, 4L, 256L, 2L, 4);
+        assertUidTotal(sTemplateWifi, UID_RED, SET_FOREGROUND, ROAMING_DEFAULT, 512L, 4L, 256L, 2L,
+                6);
         assertUidTotal(sTemplateWifi, UID_BLUE, 128L, 1L, 128L, 1L, 0);
         verifyAndReset();
 
@@ -317,8 +323,9 @@
         // after systemReady(), we should have historical stats loaded again
         assertNetworkTotal(sTemplateWifi, 1024L, 8L, 2048L, 16L, 0);
         assertUidTotal(sTemplateWifi, UID_RED, 1024L, 8L, 512L, 4L, 10);
-        assertUidTotal(sTemplateWifi, UID_RED, SET_DEFAULT, 512L, 4L, 256L, 2L, 4);
-        assertUidTotal(sTemplateWifi, UID_RED, SET_FOREGROUND, 512L, 4L, 256L, 2L, 6);
+        assertUidTotal(sTemplateWifi, UID_RED, SET_DEFAULT, ROAMING_DEFAULT, 512L, 4L, 256L, 2L, 4);
+        assertUidTotal(sTemplateWifi, UID_RED, SET_FOREGROUND, ROAMING_DEFAULT, 512L, 4L, 256L, 2L,
+                6);
         assertUidTotal(sTemplateWifi, UID_BLUE, 128L, 1L, 128L, 1L, 0);
         verifyAndReset();
 
@@ -670,16 +677,20 @@
         NetworkStats stats = mSession.getSummaryForAllUid(
                 sTemplateWifi, Long.MIN_VALUE, Long.MAX_VALUE, true);
         assertEquals(3, stats.size());
-        assertValues(stats, IFACE_ALL, UID_RED, SET_DEFAULT, TAG_NONE, 50L, 5L, 50L, 5L, 1);
-        assertValues(stats, IFACE_ALL, UID_RED, SET_DEFAULT, 0xF00D, 10L, 1L, 10L, 1L, 1);
-        assertValues(stats, IFACE_ALL, UID_BLUE, SET_DEFAULT, TAG_NONE, 2048L, 16L, 1024L, 8L, 0);
+        assertValues(stats, IFACE_ALL, UID_RED, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 50L, 5L,
+                50L, 5L, 1);
+        assertValues(stats, IFACE_ALL, UID_RED, SET_DEFAULT, 0xF00D, ROAMING_DEFAULT, 10L, 1L, 10L,
+                1L, 1);
+        assertValues(stats, IFACE_ALL, UID_BLUE, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 2048L, 16L,
+                1024L, 8L, 0);
 
         // now verify that recent history only contains one uid
         final long currentTime = currentTimeMillis();
         stats = mSession.getSummaryForAllUid(
                 sTemplateWifi, currentTime - HOUR_IN_MILLIS, currentTime, true);
         assertEquals(1, stats.size());
-        assertValues(stats, IFACE_ALL, UID_BLUE, SET_DEFAULT, TAG_NONE, 1024L, 8L, 512L, 4L, 0);
+        assertValues(stats, IFACE_ALL, UID_BLUE, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 1024L, 8L,
+                512L, 4L, 0);
 
         verifyAndReset();
     }
@@ -742,10 +753,61 @@
         final NetworkStats stats = mSession.getSummaryForAllUid(
                 sTemplateWifi, Long.MIN_VALUE, Long.MAX_VALUE, true);
         assertEquals(4, stats.size());
-        assertValues(stats, IFACE_ALL, UID_RED, SET_DEFAULT, TAG_NONE, 128L, 2L, 128L, 2L, 1);
-        assertValues(stats, IFACE_ALL, UID_RED, SET_DEFAULT, 0xF00D, 64L, 1L, 64L, 1L, 1);
-        assertValues(stats, IFACE_ALL, UID_RED, SET_FOREGROUND, TAG_NONE, 32L, 2L, 32L, 2L, 1);
-        assertValues(stats, IFACE_ALL, UID_RED, SET_FOREGROUND, 0xFAAD, 1L, 1L, 1L, 1L, 1);
+        assertValues(stats, IFACE_ALL, UID_RED, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 128L, 2L,
+                128L, 2L, 1);
+        assertValues(stats, IFACE_ALL, UID_RED, SET_DEFAULT, 0xF00D, ROAMING_DEFAULT, 64L, 1L, 64L,
+                1L, 1);
+        assertValues(stats, IFACE_ALL, UID_RED, SET_FOREGROUND, TAG_NONE, ROAMING_DEFAULT, 32L, 2L,
+                32L, 2L, 1);
+        assertValues(stats, IFACE_ALL, UID_RED, SET_FOREGROUND, 0xFAAD, ROAMING_DEFAULT, 1L, 1L, 1L,
+                1L, 1);
+
+        verifyAndReset();
+    }
+
+    public void testRoaming() throws Exception {
+        // pretend that network comes online
+        expectCurrentTime();
+        expectDefaultSettings();
+        expectNetworkState(buildMobile3gState(IMSI_1, true /* isRoaming */));
+        expectNetworkStatsSummary(buildEmptyStats());
+        expectNetworkStatsUidDetail(buildEmptyStats());
+        expectNetworkStatsPoll();
+        expectBandwidthControlCheck();
+
+        replay();
+        mService.forceUpdateIfaces();
+        verifyAndReset();
+
+        // Create some traffic
+        incrementCurrentTime(HOUR_IN_MILLIS);
+        expectCurrentTime();
+        expectDefaultSettings();
+        expectNetworkStatsSummary(buildEmptyStats());
+        // Note that all traffic from NetworkManagementService is tagged as ROAMING_DEFAULT, because
+        // roaming isn't tracked at that layer. We layer it on top by inspecting the iface
+        // properties.
+        expectNetworkStatsUidDetail(new NetworkStats(getElapsedRealtime(), 1)
+                .addValues(TEST_IFACE, UID_RED, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, 128L, 2L,
+                        128L, 2L, 0L)
+                .addValues(TEST_IFACE, UID_RED, SET_DEFAULT, 0xF00D, ROAMING_DEFAULT, 64L, 1L, 64L,
+                        1L, 0L));
+        expectNetworkStatsPoll();
+
+        replay();
+        mServiceContext.sendBroadcast(new Intent(ACTION_NETWORK_STATS_POLL));
+
+        // verify service recorded history
+        assertUidTotal(sTemplateImsi1, UID_RED, 128L, 2L, 128L, 2L, 0);
+
+        // verify entire history present
+        final NetworkStats stats = mSession.getSummaryForAllUid(
+                sTemplateImsi1, Long.MIN_VALUE, Long.MAX_VALUE, true);
+        assertEquals(2, stats.size());
+        assertValues(stats, IFACE_ALL, UID_RED, SET_DEFAULT, TAG_NONE, ROAMING_ROAMING, 128L, 2L,
+                128L, 2L, 0);
+        assertValues(stats, IFACE_ALL, UID_RED, SET_DEFAULT, 0xF00D, ROAMING_ROAMING, 64L, 1L, 64L,
+                1L, 0);
 
         verifyAndReset();
     }
@@ -805,17 +867,19 @@
 
         // verify summary API
         final NetworkStats stats = mSession.getSummaryForNetwork(template, start, end);
-        assertValues(stats, IFACE_ALL, UID_ALL, SET_DEFAULT, TAG_NONE, rxBytes, rxPackets, txBytes,
-                txPackets, operations);
+        assertValues(stats, IFACE_ALL, UID_ALL, SET_DEFAULT, TAG_NONE, ROAMING_DEFAULT, rxBytes,
+                rxPackets, txBytes, txPackets, operations);
     }
 
     private void assertUidTotal(NetworkTemplate template, int uid, long rxBytes, long rxPackets,
             long txBytes, long txPackets, int operations) throws Exception {
-        assertUidTotal(template, uid, SET_ALL, rxBytes, rxPackets, txBytes, txPackets, operations);
+        assertUidTotal(template, uid, SET_ALL, ROAMING_ALL, rxBytes, rxPackets, txBytes, txPackets,
+                operations);
     }
 
-    private void assertUidTotal(NetworkTemplate template, int uid, int set, long rxBytes,
-            long rxPackets, long txBytes, long txPackets, int operations) throws Exception {
+    private void assertUidTotal(NetworkTemplate template, int uid, int set, int roaming,
+            long rxBytes, long rxPackets, long txBytes, long txPackets, int operations)
+            throws Exception {
         // verify history API
         final NetworkStatsHistory history = mSession.getHistoryForUid(
                 template, uid, set, TAG_NONE, FIELD_ALL);
@@ -825,8 +889,8 @@
         // verify summary API
         final NetworkStats stats = mSession.getSummaryForAllUid(
                 template, Long.MIN_VALUE, Long.MAX_VALUE, false);
-        assertValues(stats, IFACE_ALL, uid, set, TAG_NONE, rxBytes, rxPackets, txBytes, txPackets,
-                operations);
+        assertValues(stats, IFACE_ALL, uid, set, TAG_NONE, roaming, rxBytes, rxPackets, txBytes,
+                txPackets, operations);
     }
 
     private void expectSystemReady() throws Exception {
@@ -933,18 +997,31 @@
     }
 
     private static void assertValues(NetworkStats stats, String iface, int uid, int set,
-            int tag, long rxBytes, long rxPackets, long txBytes, long txPackets, int operations) {
+            int tag, int roaming, long rxBytes, long rxPackets, long txBytes, long txPackets,
+            int operations) {
         final NetworkStats.Entry entry = new NetworkStats.Entry();
+        List<Integer> sets = new ArrayList<>();
         if (set == SET_DEFAULT || set == SET_ALL) {
-            final int i = stats.findIndex(iface, uid, SET_DEFAULT, tag);
-            if (i != -1) {
-                entry.add(stats.getValues(i, null));
-            }
+            sets.add(SET_DEFAULT);
         }
         if (set == SET_FOREGROUND || set == SET_ALL) {
-            final int i = stats.findIndex(iface, uid, SET_FOREGROUND, tag);
-            if (i != -1) {
-                entry.add(stats.getValues(i, null));
+            sets.add(SET_FOREGROUND);
+        }
+
+        List<Integer> roamings = new ArrayList<>();
+        if (roaming == ROAMING_DEFAULT || roaming == ROAMING_ALL) {
+            roamings.add(ROAMING_DEFAULT);
+        }
+        if (roaming == ROAMING_ROAMING || roaming == ROAMING_ALL) {
+            roamings.add(ROAMING_ROAMING);
+        }
+
+        for (int s : sets) {
+            for (int r : roamings) {
+                final int i = stats.findIndex(iface, uid, s, tag, r);
+                if (i != -1) {
+                    entry.add(stats.getValues(i, null));
+                }
             }
         }
 
@@ -974,9 +1051,14 @@
     }
 
     private static NetworkState buildMobile3gState(String subscriberId) {
+        return buildMobile3gState(subscriberId, false /* isRoaming */);
+    }
+
+    private static NetworkState buildMobile3gState(String subscriberId, boolean isRoaming) {
         final NetworkInfo info = new NetworkInfo(
                 TYPE_MOBILE, TelephonyManager.NETWORK_TYPE_UMTS, null, null);
         info.setDetailedState(DetailedState.CONNECTED, null, null);
+        info.setRoaming(isRoaming);
         final LinkProperties prop = new LinkProperties();
         prop.setInterfaceName(TEST_IFACE);
         return new NetworkState(info, prop, null, null, subscriberId, null);