diff --git a/core/java/android/net/ConnectivityManager.java b/core/java/android/net/ConnectivityManager.java
index 4eecfa9..3da00b1 100644
--- a/core/java/android/net/ConnectivityManager.java
+++ b/core/java/android/net/ConnectivityManager.java
@@ -23,10 +23,14 @@
 import android.content.Context;
 import android.os.Binder;
 import android.os.Build.VERSION_CODES;
+import android.os.IBinder;
+import android.os.INetworkActivityListener;
+import android.os.INetworkManagementService;
 import android.os.Messenger;
 import android.os.RemoteException;
-import android.os.ResultReceiver;
+import android.os.ServiceManager;
 import android.provider.Settings;
+import android.util.ArrayMap;
 
 import java.net.InetAddress;
 
@@ -77,7 +81,7 @@
 
     /**
      * Identical to {@link #CONNECTIVITY_ACTION} broadcast, but sent without any
-     * applicable {@link Settings.Secure#CONNECTIVITY_CHANGE_DELAY}.
+     * applicable {@link Settings.Global#CONNECTIVITY_CHANGE_DELAY}.
      *
      * @hide
      */
@@ -171,6 +175,11 @@
      * {@hide}
      */
     public static final String EXTRA_IS_ACTIVE = "isActive";
+    /**
+     * The lookup key for a long that contains the timestamp (nanos) of the radio state change.
+     * {@hide}
+     */
+    public static final String EXTRA_REALTIME_NS = "tsNanos";
 
     /**
      * Broadcast Action: The setting for background data usage has changed
@@ -403,6 +412,8 @@
 
     private final String mPackageName;
 
+    private INetworkManagementService mNMService;
+
     /**
      * Tests if a given integer represents a valid network type.
      * @param networkType the type to be tested
@@ -803,6 +814,8 @@
      * Ensure that a network route exists to deliver traffic to the specified
      * host via the specified network interface. An attempt to add a route that
      * already exists is ignored, but treated as successful.
+     * <p>This method requires the caller to hold the permission
+     * {@link android.Manifest.permission#CHANGE_NETWORK_STATE}.
      * @param networkType the type of the network over which traffic to the specified
      * host is to be routed
      * @param hostAddress the IP address of the host to which the route is desired
@@ -906,6 +919,92 @@
     }
 
     /**
+     * Callback for use with {@link ConnectivityManager#registerNetworkActiveListener} to
+     * find out when the current network has gone in to a high power state.
+     */
+    public interface OnNetworkActiveListener {
+        /**
+         * Called on the main thread of the process to report that the current data network
+         * has become active, and it is now a good time to perform any pending network
+         * operations.  Note that this listener only tells you when the network becomes
+         * active; if at any other time you want to know whether it is active (and thus okay
+         * to initiate network traffic), you can retrieve its instantaneous state with
+         * {@link ConnectivityManager#isNetworkActive}.
+         */
+        public void onNetworkActive();
+    }
+
+    private INetworkManagementService getNetworkManagementService() {
+        synchronized (this) {
+            if (mNMService != null) {
+                return mNMService;
+            }
+            IBinder b = ServiceManager.getService(Context.NETWORKMANAGEMENT_SERVICE);
+            mNMService = INetworkManagementService.Stub.asInterface(b);
+            return mNMService;
+        }
+    }
+
+    private final ArrayMap<OnNetworkActiveListener, INetworkActivityListener>
+            mNetworkActivityListeners
+                    = new ArrayMap<OnNetworkActiveListener, INetworkActivityListener>();
+
+    /**
+     * Start listening to reports when the data network is active, meaning it is
+     * a good time to perform network traffic.  Use {@link #isNetworkActive()}
+     * to determine the current state of the network after registering the listener.
+     *
+     * @param l The listener to be told when the network is active.
+     */
+    public void registerNetworkActiveListener(final OnNetworkActiveListener l) {
+        INetworkActivityListener rl = new INetworkActivityListener.Stub() {
+            @Override
+            public void onNetworkActive() throws RemoteException {
+                l.onNetworkActive();
+            }
+        };
+
+        try {
+            getNetworkManagementService().registerNetworkActivityListener(rl);
+            mNetworkActivityListeners.put(l, rl);
+        } catch (RemoteException e) {
+        }
+    }
+
+    /**
+     * Remove network active listener previously registered with
+     * {@link #registerNetworkActiveListener}.
+     *
+     * @param l Previously registered listener.
+     */
+    public void unregisterNetworkActiveListener(OnNetworkActiveListener l) {
+        INetworkActivityListener rl = mNetworkActivityListeners.get(l);
+        if (rl == null) {
+            throw new IllegalArgumentException("Listener not registered: " + l);
+        }
+        try {
+            getNetworkManagementService().unregisterNetworkActivityListener(rl);
+        } catch (RemoteException e) {
+        }
+    }
+
+    /**
+     * Return whether the data network is currently active.  An active network means that
+     * it is currently in a high power state for performing data transmission.  On some
+     * types of networks, it may be expensive to move and stay in such a state, so it is
+     * more power efficient to batch network traffic together when the radio is already in
+     * this state.  This method tells you whether right now is currently a good time to
+     * initiate network traffic, as the network is already active.
+     */
+    public boolean isNetworkActive() {
+        try {
+            return getNetworkManagementService().isNetworkActive();
+        } catch (RemoteException e) {
+        }
+        return false;
+    }
+
+    /**
      * {@hide}
      */
     public ConnectivityManager(IConnectivityManager service, String packageName) {
@@ -1020,7 +1119,7 @@
 
     /**
      * Check if the device allows for tethering.  It may be disabled via
-     * {@code ro.tether.denied} system property, {@link Settings#TETHER_SUPPORTED} or
+     * {@code ro.tether.denied} system property, Settings.TETHER_SUPPORTED or
      * due to device configuration.
      *
      * @return a boolean - {@code true} indicating Tethering is supported.
@@ -1208,7 +1307,7 @@
      * doing something unusual like general internal filtering this may be useful.  On
      * a private network where the proxy is not accessible, you may break HTTP using this.
      *
-     * @param proxyProperties The a {@link ProxyProperites} object defining the new global
+     * @param p The a {@link ProxyProperties} object defining the new global
      *        HTTP proxy.  A {@code null} value will clear the global HTTP proxy.
      *
      * <p>This method requires the call to hold the permission
@@ -1341,24 +1440,6 @@
 
     /**
      * Signal that the captive portal check on the indicated network
-     * is complete and we can turn the network on for general use.
-     *
-     * @param info the {@link NetworkInfo} object for the networkType
-     *        in question.
-     *
-     * <p>This method requires the call to hold the permission
-     * {@link android.Manifest.permission#CONNECTIVITY_INTERNAL}.
-     * {@hide}
-     */
-    public void captivePortalCheckComplete(NetworkInfo info) {
-        try {
-            mService.captivePortalCheckComplete(info);
-        } catch (RemoteException e) {
-        }
-    }
-
-    /**
-     * Signal that the captive portal check on the indicated network
      * is complete and whether its a captive portal or not.
      *
      * @param info the {@link NetworkInfo} object for the networkType
@@ -1379,7 +1460,7 @@
     /**
      * Supply the backend messenger for a network tracker
      *
-     * @param type NetworkType to set
+     * @param networkType NetworkType to set
      * @param messenger {@link Messenger}
      * {@hide}
      */
diff --git a/core/java/android/net/DhcpInfo.java b/core/java/android/net/DhcpInfo.java
index 3bede5d..788d7d9 100644
--- a/core/java/android/net/DhcpInfo.java
+++ b/core/java/android/net/DhcpInfo.java
@@ -18,7 +18,6 @@
 
 import android.os.Parcelable;
 import android.os.Parcel;
-import java.net.InetAddress;
 
 /**
  * A simple object for retrieving the results of a DHCP request.
diff --git a/core/java/android/net/IConnectivityManager.aidl b/core/java/android/net/IConnectivityManager.aidl
index 4bca7fe..381a817 100644
--- a/core/java/android/net/IConnectivityManager.aidl
+++ b/core/java/android/net/IConnectivityManager.aidl
@@ -129,8 +129,6 @@
 
     boolean updateLockdownVpn();
 
-    void captivePortalCheckComplete(in NetworkInfo info);
-
     void captivePortalCheckCompleted(in NetworkInfo info, boolean isCaptivePortal);
 
     void supplyMessenger(int networkType, in Messenger messenger);
diff --git a/core/java/android/net/NetworkConfig.java b/core/java/android/net/NetworkConfig.java
index 5d95f41..32a2cda 100644
--- a/core/java/android/net/NetworkConfig.java
+++ b/core/java/android/net/NetworkConfig.java
@@ -16,7 +16,6 @@
 
 package android.net;
 
-import android.util.Log;
 import java.util.Locale;
 
 /**
diff --git a/core/java/android/net/NetworkInfo.java b/core/java/android/net/NetworkInfo.java
index 4d2a70d..53b1308 100644
--- a/core/java/android/net/NetworkInfo.java
+++ b/core/java/android/net/NetworkInfo.java
@@ -156,18 +156,20 @@
     /** {@hide} */
     public NetworkInfo(NetworkInfo source) {
         if (source != null) {
-            mNetworkType = source.mNetworkType;
-            mSubtype = source.mSubtype;
-            mTypeName = source.mTypeName;
-            mSubtypeName = source.mSubtypeName;
-            mState = source.mState;
-            mDetailedState = source.mDetailedState;
-            mReason = source.mReason;
-            mExtraInfo = source.mExtraInfo;
-            mIsFailover = source.mIsFailover;
-            mIsRoaming = source.mIsRoaming;
-            mIsAvailable = source.mIsAvailable;
-            mIsConnectedToProvisioningNetwork = source.mIsConnectedToProvisioningNetwork;
+            synchronized (source) {
+                mNetworkType = source.mNetworkType;
+                mSubtype = source.mSubtype;
+                mTypeName = source.mTypeName;
+                mSubtypeName = source.mSubtypeName;
+                mState = source.mState;
+                mDetailedState = source.mDetailedState;
+                mReason = source.mReason;
+                mExtraInfo = source.mExtraInfo;
+                mIsFailover = source.mIsFailover;
+                mIsRoaming = source.mIsRoaming;
+                mIsAvailable = source.mIsAvailable;
+                mIsConnectedToProvisioningNetwork = source.mIsConnectedToProvisioningNetwork;
+            }
         }
     }
 
diff --git a/core/java/android/net/ProxyProperties.java b/core/java/android/net/ProxyProperties.java
index 010e527..50f45e8 100644
--- a/core/java/android/net/ProxyProperties.java
+++ b/core/java/android/net/ProxyProperties.java
@@ -22,7 +22,6 @@
 import android.text.TextUtils;
 
 import java.net.InetSocketAddress;
-import java.net.UnknownHostException;
 import java.util.Locale;
 
 /**
@@ -141,13 +140,9 @@
 
     public boolean isValid() {
         if (!TextUtils.isEmpty(mPacFileUrl)) return true;
-        try {
-            Proxy.validate(mHost == null ? "" : mHost, mPort == 0 ? "" : Integer.toString(mPort),
-                    mExclusionList == null ? "" : mExclusionList);
-        } catch (IllegalArgumentException e) {
-            return false;
-        }
-        return true;
+        return Proxy.PROXY_VALID == Proxy.validate(mHost == null ? "" : mHost,
+                                                mPort == 0 ? "" : Integer.toString(mPort),
+                                                mExclusionList == null ? "" : mExclusionList);
     }
 
     public java.net.Proxy makeProxy() {
diff --git a/services/core/java/com/android/server/ConnectivityService.java b/services/core/java/com/android/server/ConnectivityService.java
index d5259f8..7d98f5e 100644
--- a/services/core/java/com/android/server/ConnectivityService.java
+++ b/services/core/java/com/android/server/ConnectivityService.java
@@ -117,6 +117,7 @@
 import com.android.internal.telephony.DctConstants;
 import com.android.internal.telephony.Phone;
 import com.android.internal.telephony.PhoneConstants;
+import com.android.internal.telephony.TelephonyIntents;
 import com.android.internal.util.IndentingPrintWriter;
 import com.android.internal.util.XmlUtils;
 import com.android.server.am.BatteryStatsService;
@@ -147,7 +148,6 @@
 import java.net.Inet6Address;
 import java.net.InetAddress;
 import java.net.URL;
-import java.net.URLConnection;
 import java.net.UnknownHostException;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -1183,9 +1183,9 @@
 
     private INetworkManagementEventObserver mDataActivityObserver = new BaseNetworkObserver() {
         @Override
-        public void interfaceClassDataActivityChanged(String label, boolean active) {
+        public void interfaceClassDataActivityChanged(String label, boolean active, long tsNanos) {
             int deviceType = Integer.parseInt(label);
-            sendDataActivityBroadcast(deviceType, active);
+            sendDataActivityBroadcast(deviceType, active, tsNanos);
         }
     };
 
@@ -1986,7 +1986,9 @@
         mNetTrackers[prevNetType].setTeardownRequested(false);
 
         // Remove idletimer previously setup in {@code handleConnect}
-        removeDataActivityTracking(prevNetType);
+        if (mNetConfigs[prevNetType].isDefault()) {
+            removeDataActivityTracking(prevNetType);
+        }
 
         /*
          * If the disconnected network is not the active one, then don't report
@@ -2167,10 +2169,11 @@
         sendStickyBroadcastDelayed(makeGeneralIntent(info, bcastType), delayMs);
     }
 
-    private void sendDataActivityBroadcast(int deviceType, boolean active) {
+    private void sendDataActivityBroadcast(int deviceType, boolean active, long tsNanos) {
         Intent intent = new Intent(ConnectivityManager.ACTION_DATA_ACTIVITY_CHANGE);
         intent.putExtra(ConnectivityManager.EXTRA_DEVICE_TYPE, deviceType);
         intent.putExtra(ConnectivityManager.EXTRA_IS_ACTIVE, active);
+        intent.putExtra(ConnectivityManager.EXTRA_REALTIME_NS, tsNanos);
         final long ident = Binder.clearCallingIdentity();
         try {
             mContext.sendOrderedBroadcastAsUser(intent, UserHandle.ALL,
@@ -2318,8 +2321,6 @@
     private void handleConnect(NetworkInfo info) {
         final int newNetType = info.getType();
 
-        setupDataActivityTracking(newNetType);
-
         // snapshot isFailover, because sendConnectedBroadcast() resets it
         boolean isFailover = info.isFailover();
         final NetworkStateTracker thisNet = mNetTrackers[newNetType];
@@ -2357,6 +2358,7 @@
                         return;
                 }
             }
+            setupDataActivityTracking(newNetType);
             synchronized (ConnectivityService.this) {
                 // have a new default network, release the transition wakelock in a second
                 // if it's held.  The second pause is to allow apps to reconnect over the
@@ -2394,36 +2396,6 @@
         }
     }
 
-    private void handleCaptivePortalTrackerCheck(NetworkInfo info) {
-        if (DBG) log("Captive portal check " + info);
-        int type = info.getType();
-        final NetworkStateTracker thisNet = mNetTrackers[type];
-        if (mNetConfigs[type].isDefault()) {
-            if (mActiveDefaultNetwork != -1 && mActiveDefaultNetwork != type) {
-                if (isNewNetTypePreferredOverCurrentNetType(type)) {
-                    if (DBG) log("Captive check on " + info.getTypeName());
-                    mCaptivePortalTracker.detectCaptivePortal(new NetworkInfo(info));
-                    return;
-                } else {
-                    if (DBG) log("Tear down low priority net " + info.getTypeName());
-                    teardown(thisNet);
-                    return;
-                }
-            }
-        }
-
-        if (DBG) log("handleCaptivePortalTrackerCheck: call captivePortalCheckComplete ni=" + info);
-        thisNet.captivePortalCheckComplete();
-    }
-
-    /** @hide */
-    @Override
-    public void captivePortalCheckComplete(NetworkInfo info) {
-        enforceConnectivityInternalPermission();
-        if (DBG) log("captivePortalCheckComplete: ni=" + info);
-        mNetTrackers[info.getType()].captivePortalCheckComplete();
-    }
-
     /** @hide */
     @Override
     public void captivePortalCheckCompleted(NetworkInfo info, boolean isCaptivePortal) {
@@ -2436,7 +2408,7 @@
      * Setup data activity tracking for the given network interface.
      *
      * Every {@code setupDataActivityTracking} should be paired with a
-     * {@link removeDataActivityTracking} for cleanup.
+     * {@link #removeDataActivityTracking} for cleanup.
      */
     private void setupDataActivityTracking(int type) {
         final NetworkStateTracker thisNet = mNetTrackers[type];
@@ -2447,7 +2419,7 @@
         if (ConnectivityManager.isNetworkTypeMobile(type)) {
             timeout = Settings.Global.getInt(mContext.getContentResolver(),
                                              Settings.Global.DATA_ACTIVITY_TIMEOUT_MOBILE,
-                                             0);
+                                             5);
             // Canonicalize mobile network type
             type = ConnectivityManager.TYPE_MOBILE;
         } else if (ConnectivityManager.TYPE_WIFI == type) {
@@ -2461,7 +2433,7 @@
 
         if (timeout > 0 && iface != null) {
             try {
-                mNetd.addIdleTimer(iface, timeout, Integer.toString(type));
+                mNetd.addIdleTimer(iface, timeout, type);
             } catch (RemoteException e) {
             }
         }
@@ -2534,9 +2506,9 @@
                                     "\n   car=" + car);
                         }
                     } else {
-                        if (DBG) {
-                            log("handleConnectivityChange: address are the same reset per doReset" +
-                                   " linkProperty[" + netType + "]:" +
+                        if (VDBG) {
+                            log("handleConnectivityChange: addresses are the same reset per" +
+                                   " doReset linkProperty[" + netType + "]:" +
                                    " resetMask=" + resetMask);
                         }
                     }
@@ -2727,7 +2699,7 @@
        final int mtu = nt.getLinkProperties().getMtu();
 
        if (mtu < 68 || mtu > 10000) {
-           loge("Unexpected mtu value: " + nt);
+           loge("Unexpected mtu value: " + mtu + ", " + nt);
            return;
        }
 
@@ -2974,6 +2946,9 @@
             }
         }
 
+        pw.print("Active default network: "); pw.println(getNetworkTypeName(mActiveDefaultNetwork));
+        pw.println();
+
         pw.println("Network Requester Pids:");
         pw.increaseIndent();
         for (int net : mPriorityList) {
@@ -3059,9 +3034,6 @@
                     if (info.getDetailedState() ==
                             NetworkInfo.DetailedState.FAILED) {
                         handleConnectionFailure(info);
-                    } else if (info.getDetailedState() ==
-                            DetailedState.CAPTIVE_PORTAL_CHECK) {
-                        handleCaptivePortalTrackerCheck(info);
                     } else if (info.isConnectedToProvisioningNetwork()) {
                         /**
                          * TODO: Create ConnectivityManager.TYPE_MOBILE_PROVISIONING
@@ -4629,10 +4601,13 @@
          * @param seconds
          */
         private static void sleep(int seconds) {
-            try {
-                Thread.sleep(seconds * 1000);
-            } catch (InterruptedException e) {
-                e.printStackTrace();
+            long stopTime = System.nanoTime() + (seconds * 1000000000);
+            long sleepTime;
+            while ((sleepTime = stopTime - System.nanoTime()) > 0) {
+                try {
+                    Thread.sleep(sleepTime / 1000000);
+                } catch (InterruptedException ignored) {
+                }
             }
         }
 
@@ -4668,16 +4643,28 @@
             mdst.setEnableFailFastMobileData(DctConstants.ENABLED);
             mdst.enableMobileProvisioning(url);
         } else {
-            if (DBG) log("handleMobileProvisioningAction: not prov network, launch browser directly");
-            Intent newIntent = Intent.makeMainSelectorActivity(Intent.ACTION_MAIN,
-                    Intent.CATEGORY_APP_BROWSER);
-            newIntent.setData(Uri.parse(url));
-            newIntent.setFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT |
-                    Intent.FLAG_ACTIVITY_NEW_TASK);
-            try {
-                mContext.startActivity(newIntent);
-            } catch (ActivityNotFoundException e) {
-                loge("handleMobileProvisioningAction: startActivity failed" + e);
+            if (DBG) log("handleMobileProvisioningAction: not prov network");
+            // Check for  apps that can handle provisioning first
+            Intent provisioningIntent = new Intent(TelephonyIntents.ACTION_CARRIER_SETUP);
+            provisioningIntent.addCategory(TelephonyIntents.CATEGORY_MCCMNC_PREFIX
+                    + mTelephonyManager.getSimOperator());
+            if (mContext.getPackageManager().resolveActivity(provisioningIntent, 0 /* flags */)
+                    != null) {
+                provisioningIntent.setFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT |
+                        Intent.FLAG_ACTIVITY_NEW_TASK);
+                mContext.startActivity(provisioningIntent);
+            } else {
+                // If no apps exist, use standard URL ACTION_VIEW method
+                Intent newIntent = Intent.makeMainSelectorActivity(Intent.ACTION_MAIN,
+                        Intent.CATEGORY_APP_BROWSER);
+                newIntent.setData(Uri.parse(url));
+                newIntent.setFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT |
+                        Intent.FLAG_ACTIVITY_NEW_TASK);
+                try {
+                    mContext.startActivity(newIntent);
+                } catch (ActivityNotFoundException e) {
+                    loge("handleMobileProvisioningAction: startActivity failed" + e);
+                }
             }
         }
     }
diff --git a/services/tests/servicestests/src/com/android/server/NetworkManagementServiceTest.java b/services/tests/servicestests/src/com/android/server/NetworkManagementServiceTest.java
index 7a30d31..0d5daa5 100644
--- a/services/tests/servicestests/src/com/android/server/NetworkManagementServiceTest.java
+++ b/services/tests/servicestests/src/com/android/server/NetworkManagementServiceTest.java
@@ -141,14 +141,21 @@
         /**
          * Interface class activity.
          */
+
         sendMessage("613 IfaceClass active rmnet0");
-        expectSoon(observer).interfaceClassDataActivityChanged("rmnet0", true);
+        expectSoon(observer).interfaceClassDataActivityChanged("rmnet0", true, 0);
+
+        sendMessage("613 IfaceClass active rmnet0 1234");
+        expectSoon(observer).interfaceClassDataActivityChanged("rmnet0", true, 1234);
 
         sendMessage("613 IfaceClass idle eth0");
-        expectSoon(observer).interfaceClassDataActivityChanged("eth0", false);
+        expectSoon(observer).interfaceClassDataActivityChanged("eth0", false, 0);
 
-        sendMessage("613 IfaceClass reallyactive rmnet0");
-        expectSoon(observer).interfaceClassDataActivityChanged("rmnet0", false);
+        sendMessage("613 IfaceClass idle eth0 1234");
+        expectSoon(observer).interfaceClassDataActivityChanged("eth0", false, 1234);
+
+        sendMessage("613 IfaceClass reallyactive rmnet0 1234");
+        expectSoon(observer).interfaceClassDataActivityChanged("rmnet0", false, 1234);
 
         sendMessage("613 InterfaceClass reallyactive rmnet0");
         // Invalid group.