[react_native] Implement connectivity module

Examples/UIExplorer/NetInfoExample.js

@@ -29,13 +29,13 @@ var ReachabilitySubscription = React.createClass({
     };
   },
   componentDidMount: function() {
-    NetInfo.reachabilityIOS.addEventListener(
+    NetInfo.addEventListener(
       'change',
       this._handleReachabilityChange
     );
   },
   componentWillUnmount: function() {
-    NetInfo.reachabilityIOS.removeEventListener(
+    NetInfo.removeEventListener(
       'change',
       this._handleReachabilityChange
     );
@@ -63,16 +63,16 @@ var ReachabilityCurrent = React.createClass({
     };
   },
   componentDidMount: function() {
-    NetInfo.reachabilityIOS.addEventListener(
+    NetInfo.addEventListener(
       'change',
       this._handleReachabilityChange
     );
-    NetInfo.reachabilityIOS.fetch().done(
+    NetInfo.fetch().done(
       (reachability) => { this.setState({reachability}); }
     );
   },
   componentWillUnmount: function() {
-    NetInfo.reachabilityIOS.removeEventListener(
+    NetInfo.removeEventListener(
       'change',
       this._handleReachabilityChange
     );

Libraries/Network/NetInfo.js

@@ -12,8 +12,14 @@
 'use strict';
 
 var NativeModules = require('NativeModules');
+var Platform = require('Platform');
 var RCTDeviceEventEmitter = require('RCTDeviceEventEmitter');
-var RCTReachability = NativeModules.Reachability;
+
+if (Platform.OS === 'ios') {
+  var RCTNetInfo = NativeModules.Reachability;
+} else if (Platform.OS === 'android') {
+  var RCTNetInfo = NativeModules.NetInfo;
+}
 
 var DEVICE_REACHABILITY_EVENT = 'reachabilityDidChange';
 
@@ -28,11 +34,50 @@ type ReachabilityStateIOS = $Enum<{
   wifi: string;
 }>;
 
+type ConnectivityStateAndroid = $Enum<{
+  NONE: string;
+  MOBILE: string;
+  WIFI: string;
+  MOBILE_MMS: string;
+  MOBILE_SUPL: string;
+  MOBILE_DUN: string;
+  MOBILE_HIPRI: string;
+  WIMAX: string;
+  BLUETOOTH: string;
+  DUMMY: string;
+  ETHERNET: string;
+  MOBILE_FOTA: string;
+  MOBILE_IMS: string;
+  MOBILE_CBS: string;
+  WIFI_P2P: string;
+  MOBILE_IA: string;
+  MOBILE_EMERGENCY: string;
+  PROXY: string;
+  VPN: string;
+  UNKNOWN: string;
+}>;
 
 /**
  * NetInfo exposes info about online/offline status
  *
- * ### reachabilityIOS
+ * ```
+ * NetInfo.fetch().done((reach) => {
+ *   console.log('Initial: ' + reach);
+ * });
+ * function handleFirstConnectivityChange(reach) {
+ *   console.log('First change: ' + reach);
+ *   NetInfo.removeEventListener(
+ *     'change',
+ *     handleFirstConnectivityChange
+ *   );
+ * }
+ * NetInfo.addEventListener(
+ *   'change',
+ *   handleFirstConnectivityChange
+ * );
+ * ```
+ *
+ * ### IOS
  *
  * Asynchronously determine if the device is online and on a cellular network.
  *
@@ -41,21 +86,35 @@ type ReachabilityStateIOS = $Enum<{
  * - `cell` - device is connected via Edge, 3G, WiMax, or LTE
  * - `unknown` - error case and the network status is unknown
  *
- * ```
- * NetInfo.reachabilityIOS.fetch().done((reach) => {
- *   console.log('Initial: ' + reach);
+ * ### Android
+ *
+ * Asynchronously determine if the device is connected and details about that connection.
+ *
+ * Android Connectivity Types
+ * - `NONE` - device is offline
+ * - `BLUETOOTH` - The Bluetooth data connection.
+ * - `DUMMY` -  Dummy data connection.
+ * - `ETHERNET` - The Ethernet data connection.
+ * - `MOBILE` - The Mobile data connection.
+ * - `MOBILE_DUN` - A DUN-specific Mobile data connection.
+ * - `MOBILE_HIPRI` - A High Priority Mobile data connection.
+ * - `MOBILE_MMS` - An MMS-specific Mobile data connection.
+ * - `MOBILE_SUPL` -  A SUPL-specific Mobile data connection.
+ * - `VPN` -  A virtual network using one or more native bearers. Requires API Level 21
+ * - `WIFI` - The WIFI data connection.
+ * - `WIMAX` -  The WiMAX data connection.
+ * - `UNKNOWN` - Unknown data connection.
+ * The rest ConnectivityStates are hidden by the Android API, but can be used if necessary.
+ *
+ * ### isConnectionMetered
+ *
+ * Available on Android. Detect if the current active connection is metered or not. A network is
+ * classified as metered when the user is sensitive to heavy data usage on that connection due to
+ * monetary costs, data limitations or battery/performance issues.
+ *
+ * NetInfo.isConnectionMetered((isConnectionMetered) => {
+ *   console.log('Connection is ' + (isConnectionMetered ? 'Metered' : 'Not Metered'));
  * });
- * function handleFirstReachabilityChange(reach) {
- *   console.log('First change: ' + reach);
- *   NetInfo.reachabilityIOS.removeEventListener(
- *     'change',
- *     handleFirstReachabilityChange
- *   );
- * }
- * NetInfo.reachabilityIOS.addEventListener(
- *   'change',
- *   handleFirstReachabilityChange
- * );
  * ```
  *
  * ### isConnected
@@ -81,21 +140,14 @@ type ReachabilityStateIOS = $Enum<{
  * ```
  */
 
-var NetInfo = {};
+var _subscriptions = {};
 
-if (RCTReachability) {
-
-  // RCTReachability is exposed, so this is an iOS-like environment and we will
-  // expose reachabilityIOS
-
-  var _reachabilitySubscriptions = {};
-
-  NetInfo.reachabilityIOS = {
+var NetInfo = {
   addEventListener: function (
     eventName: ChangeEventName,
     handler: Function
   ): void {
-      _reachabilitySubscriptions[handler] = RCTDeviceEventEmitter.addListener(
+    _subscriptions[handler] = RCTDeviceEventEmitter.addListener(
       DEVICE_REACHABILITY_EVENT,
       (appStateData) => {
         handler(appStateData.network_reachability);
@@ -107,16 +159,16 @@ if (RCTReachability) {
     eventName: ChangeEventName,
     handler: Function
   ): void {
-      if (!_reachabilitySubscriptions[handler]) {
+    if (!_subscriptions[handler]) {
       return;
     }
-      _reachabilitySubscriptions[handler].remove();
-      _reachabilitySubscriptions[handler] = null;
+    _subscriptions[handler].remove();
+    _subscriptions[handler] = null;
   },
 
   fetch: function(): Promise {
     return new Promise((resolve, reject) => {
-        RCTReachability.getCurrentReachability(
+      RCTNetInfo.getCurrentReachability(
         function(resp) {
           resolve(resp.network_reachability);
         },
@@ -124,26 +176,38 @@ if (RCTReachability) {
       );
     });
   },
+
+  isConnected: {},
+
+  isConnectionMetered: {},
 };
 
-  var _isConnectedSubscriptions = {};
-
-  var _iosReachabilityIsConnected = function(
+if (Platform.OS === 'ios') {
+  var _isConnected = function(
     reachability: ReachabilityStateIOS
   ): bool {
     return reachability !== 'none' &&
       reachability !== 'unknown';
   };
+} else if (Platform.OS === 'android') {
+  var _isConnected = function(
+      connectionType: ConnectivityStateAndroid
+    ): bool {
+    return connectionType !== 'NONE' && connectionType !== 'UNKNOWN';
+  };
+}
+
+var _isConnectedSubscriptions = {};
 
 NetInfo.isConnected = {
   addEventListener: function (
     eventName: ChangeEventName,
     handler: Function
   ): void {
-      _isConnectedSubscriptions[handler] = (reachability) => {
-        handler(_iosReachabilityIsConnected(reachability));
+    _isConnectedSubscriptions[handler] = (connection) => {
+      handler(_isConnected(connection));
     };
-      NetInfo.reachabilityIOS.addEventListener(
+    NetInfo.addEventListener(
       eventName,
       _isConnectedSubscriptions[handler]
     );
@@ -153,18 +217,25 @@ if (RCTReachability) {
     eventName: ChangeEventName,
     handler: Function
   ): void {
-      NetInfo.reachabilityIOS.removeEventListener(
+    NetInfo.removeEventListener(
       eventName,
       _isConnectedSubscriptions[handler]
     );
   },
 
   fetch: function(): Promise {
-      return NetInfo.reachabilityIOS.fetch().then(
-        (reachability) => _iosReachabilityIsConnected(reachability)
+    return NetInfo.fetch().then(
+      (connection) => _isConnected(connection)
     );
   },
 };
+
+if (Platform.OS === 'android') {
+  NetInfo.isConnectionMetered = function(callback): void {
+    RCTNetInfo.isConnectionMetered((_isMetered) => {
+      callback(_isMetered);
+    });
+  };
 }
 
 module.exports = NetInfo;