Network data activity change intent for network interfaces.

The activity notification is received from netd, an intent
DATA_ACTIVITY_CHANGE is then raised for other part of the system to
consume.

Change-Id: Idfcc4763c51c5b314c57f546c12557082f06bebf

core/java/android/net/ConnectivityManager.java

@@ -136,6 +136,28 @@ public class ConnectivityManager {
      */
     public static final String EXTRA_INET_CONDITION = "inetCondition";
 
+    /**
+     * Broadcast action to indicate the change of data activity status
+     * (idle or active) on a network in a recent period.
+     * The network becomes active when data transimission is started, or
+     * idle if there is no data transimition for a period of time.
+     * {@hide}
+     */
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
+    public static final String ACTION_DATA_ACTIVITY_CHANGE = "android.net.conn.DATA_ACTIVITY_CHANGE";
+    /**
+     * The lookup key for an enum that indicates the network device type on which this data activity
+     * change happens.
+     * {@hide}
+     */
+    public static final String EXTRA_DEVICE_TYPE = "deviceType";
+    /**
+     * The lookup key for a boolean that indicates the device is active or not. {@code true} means
+     * it is actively sending or receiving data and {@code false} means it is idle.
+     * {@hide}
+     */
+    public static final String EXTRA_IS_ACTIVE = "isActive";
+
     /**
      * Broadcast Action: The setting for background data usage has changed
      * values. Use {@link #getBackgroundDataSetting()} to get the current value.

services/java/com/android/server/ConnectivityService.java

@@ -17,6 +17,7 @@
 package com.android.server;
 
 import static android.Manifest.permission.MANAGE_NETWORK_POLICY;
+import static android.Manifest.permission.RECEIVE_DATA_ACTIVITY_CHANGE;
 import static android.net.ConnectivityManager.CONNECTIVITY_ACTION;
 import static android.net.ConnectivityManager.CONNECTIVITY_ACTION_IMMEDIATE;
 import static android.net.ConnectivityManager.isNetworkTypeValid;
@@ -35,6 +36,7 @@ import android.net.ConnectivityManager;
 import android.net.DummyDataStateTracker;
 import android.net.EthernetDataTracker;
 import android.net.IConnectivityManager;
+import android.net.INetworkManagementEventObserver;
 import android.net.INetworkPolicyListener;
 import android.net.INetworkPolicyManager;
 import android.net.INetworkStatsService;
@@ -546,6 +548,13 @@ public class ConnectivityService extends IConnectivityManager.Stub {
         mSettingsObserver = new SettingsObserver(mHandler, EVENT_APPLY_GLOBAL_HTTP_PROXY);
         mSettingsObserver.observe(mContext);
 
+        INetworkManagementEventObserver netdObserver = new NetdObserver();
+        try {
+            mNetd.registerObserver(netdObserver);
+        } catch (RemoteException e) {
+            loge("Error registering observer :" + e);
+        }
+
         loadGlobalProxy();
     }
 private NetworkStateTracker makeWimaxStateTracker() {
@@ -923,6 +932,19 @@ private NetworkStateTracker makeWimaxStateTracker() {
         return tracker != null && tracker.setRadio(turnOn);
     }
 
+    private class NetdObserver extends INetworkManagementEventObserver.Stub {
+        public void interfaceClassDataActivityChanged(String label, boolean active) {
+            int deviceType = Integer.parseInt(label);
+            sendDataActivityBroadcast(deviceType, active);
+        }
+
+        public void interfaceStatusChanged(String iface, boolean up) {}
+        public void interfaceLinkStateChanged(String iface, boolean up) {}
+        public void interfaceAdded(String iface) {}
+        public void interfaceRemoved(String iface) {}
+        public void limitReached(String limitName, String iface) {}
+    }
+
     /**
      * Used to notice when the calling process dies so we can self-expire
      *
@@ -1759,6 +1781,13 @@ private NetworkStateTracker makeWimaxStateTracker() {
         sendStickyBroadcastDelayed(makeGeneralIntent(info, bcastType), delayMs);
     }
 
+    private void sendDataActivityBroadcast(int deviceType, boolean active) {
+        Intent intent = new Intent(ConnectivityManager.ACTION_DATA_ACTIVITY_CHANGE);
+        intent.putExtra(ConnectivityManager.EXTRA_DEVICE_TYPE, deviceType);
+        intent.putExtra(ConnectivityManager.EXTRA_IS_ACTIVE, active);
+        mContext.sendOrderedBroadcast(intent, RECEIVE_DATA_ACTIVITY_CHANGE);
+    }
+
     /**
      * Called when an attempt to fail over to another network has failed.
      * @param info the {@link NetworkInfo} for the failed network