react-native/website/versioned_docs/0.49/netinfo.md

id, title, original_id

id	title	original_id
version-0.49-netinfo	netinfo	netinfo

NetInfo #

NetInfo exposes info about online/offline status

NetInfo.getConnectionInfo().then((connectionInfo) => { console.log('Initial, type: ' + connectionInfo.type + ', effectiveType: ' + connectionInfo.effectiveType); }); function handleFirstConnectivityChange(connectionInfo) { console.log('First change, type: ' + connectionInfo.type + ', effectiveType: ' + connectionInfo.effectiveType); NetInfo.removeEventListener( 'connectionChange', handleFirstConnectivityChange ); } NetInfo.addEventListener( 'connectionChange', handleFirstConnectivityChange );

ConnectionType enum #

ConnectionType describes the type of connection the device is using to communicate with the network.

Cross platform values for ConnectionType:

• none - device is offline
• wifi - device is online and connected via wifi, or is the iOS simulator
• cellular - device is connected via Edge, 3G, WiMax, or LTE
• unknown - error case and the network status is unknown

  Android-only values for ConnectionType:

• bluetooth - device is connected via Bluetooth
• ethernet - device is connected via Ethernet
• wimax - device is connected via WiMAX

  EffectiveConnectionType enum #

  Cross platform values for EffectiveConnectionType:

• 2g
• 3g
• 4g
• unknown

  Android #

  To request network info, you need to add the following line to your app's AndroidManifest.xml:

  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

  isConnectionExpensive #

  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.isConnectionExpensive() .then(isConnectionExpensive => { console.log('Connection is ' + (isConnectionExpensive ? 'Expensive' : 'Not Expensive')); }) .catch(error => { console.error(error); });

  isConnected #

  Available on all platforms. Asynchronously fetch a boolean to determine internet connectivity.

  NetInfo.isConnected.fetch().then(isConnected => { console.log('First, is ' + (isConnected ? 'online' : 'offline')); }); function handleFirstConnectivityChange(isConnected) { console.log('Then, is ' + (isConnected ? 'online' : 'offline')); NetInfo.isConnected.removeEventListener( 'change', handleFirstConnectivityChange ); } NetInfo.isConnected.addEventListener( 'change', handleFirstConnectivityChange );

  Connectivity Types (deprecated) #

  The following connectivity types are deprecated. They're used by the deprecated APIs fetch and the change event.

  iOS connectivity types (deprecated):

• none - device is offline
• wifi - device is online and connected via wifi, or is the iOS simulator
• cell - device is connected via Edge, 3G, WiMax, or LTE
• unknown - error case and the network status is unknown

  Android connectivity types (deprecated).

• 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 of the connectivity types are hidden by the Android API, but can be used if necessary.

Methods #

static addEventListener(eventName, handler) #

Adds an event handler. Supported events:

• connectionChange: Fires when the network status changes. The argument to the event handler is an object with keys:
  • type: A ConnectionType (listed above)
  • effectiveType: An EffectiveConnectionType (listed above)
• change: This event is deprecated. Listen to connectionChange instead. Fires when the network status changes. The argument to the event handler is one of the deprecated connectivity types listed above.

static removeEventListener(eventName, handler) #

Removes the listener for network status changes.

static fetch() #

This function is deprecated. Use getConnectionInfo instead. Returns a promise that resolves with one of the deprecated connectivity types listed above.

static getConnectionInfo() #

Returns a promise that resolves to an object with type and effectiveType keys whose values are a ConnectionType and an EffectiveConnectionType, (described above), respectively.

static isConnectionExpensive() #

Properties #

isConnected: ObjectExpression #

An object with the same methods as above but the listener receives a boolean which represents the internet connectivity. Use this if you are only interested with whether the device has internet connectivity.

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