Add user control to turn on/off nsd

Change-Id: Ide3cc20adb21ac6dffaf6b9b9136d77a129afa3b

Author: isheriff

core/java/android/net/nsd/INsdManager.aidl

@@ -26,4 +26,5 @@ import android.os.Messenger;
 interface INsdManager
 {
     Messenger getMessenger();
+    void setEnabled(boolean enable);
 }

core/java/android/net/nsd/NsdManager.java

@@ -16,6 +16,8 @@
 
 package android.net.nsd;
 
+import android.annotation.SdkConstant;
+import android.annotation.SdkConstant.SdkConstantType;
 import android.content.Context;
 import android.os.Binder;
 import android.os.IBinder;
@@ -133,6 +135,44 @@ public class NsdManager {
     private static final String TAG = "NsdManager";
     INsdManager mService;
 
+    /**
+     * Broadcast intent action to indicate whether network service discovery is
+     * enabled or disabled. An extra {@link #EXTRA_NSD_STATE} provides the state
+     * information as int.
+     *
+     * @see #EXTRA_NSD_STATE
+     * @hide
+     */
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
+    public static final String NSD_STATE_CHANGED_ACTION =
+        "android.net.nsd.STATE_CHANGED";
+
+    /**
+     * The lookup key for an int that indicates whether network service discovery is enabled
+     * or disabled. Retrieve it with {@link android.content.Intent#getIntExtra(String,int)}.
+     *
+     * @see #NSD_STATE_DISABLED
+     * @see #NSD_STATE_ENABLED
+     * @hide
+     */
+    public static final String EXTRA_NSD_STATE = "nsd_state";
+
+    /**
+     * Network service discovery is disabled
+     *
+     * @see #NSD_STATE_CHANGED_ACTION
+     * @hide
+     */
+    public static final int NSD_STATE_DISABLED = 1;
+
+    /**
+     * Network service discovery is enabled
+     *
+     * @see #NSD_STATE_CHANGED_ACTION
+     * @hide
+     */
+    public static final int NSD_STATE_ENABLED = 2;
+
     private static final int BASE = Protocol.BASE_NSD_MANAGER;
 
     /** @hide */
@@ -188,6 +228,12 @@ public class NsdManager {
     /** @hide */
     public static final int STOP_RESOLVE_SUCCEEDED                  = BASE + 23;
 
+    /** @hide */
+    public static final int ENABLE                                  = BASE + 24;
+    /** @hide */
+    public static final int DISABLE                                 = BASE + 25;
+
+
     /**
      * Create a new Nsd instance. Applications use
      * {@link android.content.Context#getSystemService Context.getSystemService()} to retrieve
@@ -312,8 +358,8 @@ public static class Channel {
         private DnsSdResolveListener mDnsSdResolveListener;
         private ActionListener mDnsSdStopResolveListener;
 
-        AsyncChannel mAsyncChannel;
-        ServiceHandler mHandler;
+        private AsyncChannel mAsyncChannel;
+        private ServiceHandler mHandler;
         class ServiceHandler extends Handler {
             ServiceHandler(Looper looper) {
                 super(looper);
@@ -594,6 +640,13 @@ public void stopServiceResolve(Channel c) {
         c.mAsyncChannel.sendMessage(STOP_RESOLVE);
     }
 
+    /** Internal use only @hide */
+    public void setEnabled(boolean enabled) {
+        try {
+            mService.setEnabled(enabled);
+        } catch (RemoteException e) { }
+    }
+
     /**
      * Get a reference to NetworkService handler. This is used to establish
      * an AsyncChannel communication with the service

core/java/android/provider/Settings.java

@@ -3276,6 +3276,12 @@ public static final String getBluetoothInputDevicePriorityKey(String address) {
         public static final String WIFI_MOBILE_DATA_TRANSITION_WAKELOCK_TIMEOUT_MS =
             "wifi_mobile_data_transition_wakelock_timeout_ms";
 
+        /**
+         * Whether network service discovery is enabled.
+         * @hide
+         */
+        public static final String NSD_ON = "nsd_on";
+
         /**
          * Whether background data usage is allowed by the user. See
          * ConnectivityManager for more info.