Two Methods for Android to listen to wi-fi broadcasts

1. Declaration in XML

<Cycler android: name = ". NetworkConnectChangedReceiver">
<Intent-filter>
<Action android: name = "android.net. conn. CONNECTIVITY_CHANGE"/>
<Action android: name = "android.net. wifi. WIFI_STATE_CHANGED"/>
<Action android: name = "android.net. wifi. STATE_CHANGE"/>
</Intent-filter>
</Cycler>

2. Register in the code
IntentFilter filter = new IntentFilter ();
Filter. addAction (WifiManager. NETWORK_STATE_CHANGED_ACTION );
Filter. addAction (WifiManager. WIFI_STATE_CHANGED_ACTION );
Filter. addAction (ConnectivityManager. CONNECTIVITY_ACTION );
RegisterReceiver (new NetworkConnectChangedReceiver (), filter );

3. Implementation

Package com. example. testss; import android. content. broadcastReceiver; import android. content. context; import android. content. intent; import android.net. connectivityManager; import android.net. networkInfo; import android.net. networkInfo. state; import android.net. wifi. wifiManager; import android. OS. parcelable; import android. util. log; public class NetworkConnectChangedReceiver extends BroadcastReceiver {@ Over Ride public void onReceive (Context context, Intent intent) {if (WifiManager. WIFI_STATE_CHANGED_ACTION.equals (intent. getAction () {// enable and disable the listener wifi. It has nothing to do with the connection of the wifi. int wifiState = intent. getIntExtra (WifiManager. EXTRA_WIFI_STATE, 0); Log. e ("H3c", "wifiState" + wifiState); switch (wifiState) {case WifiManager. WIFI_STATE_DISABLED: break; case WifiManager. WIFI_STATE_DISABLING: break; //} // This listens to the Wi-Fi The connection status indicates whether a valid wireless route is connected. When the broadcast status is WifiManager. WIFI_STATE_DISABLING and WIFI_STATE_DISABLED, the broadcast is not received. // WifiManager is used to broadcast data to IOT platform. WIFI_STATE_ENABLED status will also receive this broadcast, of course, just opened wifi is certainly not connected to a valid wireless if (WifiManager. NETWORK_STATE_CHANGED_ACTION.equals (intent. getAction () {Parcelable parcelableExtra = intent. getParcelableExtra (WifiManager. EXTRA_NETWORK_INFO); if (null! = ParcelableExtra) {NetworkInfo networkInfo = (NetworkInfo) parcelableExtra; State state = networkInfo. getState (); boolean isConnected = state = State. CONNECTED; // Of course, you can determine the status Log more accurately. e ("H3c", "isConnected" + isConnected); if (isConnected) {} else {}}// set the network connection for this listener, including enabling and disabling wifi and mobile data .. // It is best to use this listener. If wifi is enabled, disabled, and connections available on the connection are listened. See log // The biggest drawback of this broadcast is that it is slower than the response of the above two broadcasts. if you only want to listen to wifi, I think it is more appropriate to use the above two combinations if (ConnectivityManager. CONNECTIVITY_ACTION.equals (intent. getAction () {<p> ConnectivityManager manager = (ConnectivityManager) context. getSystemService (Context. CONNECTIVITY_SERVICE); NetworkInfo gprs = manager. getNetworkInfo (ConnectivityManager. TYPE_MOBILE); NetworkInfo wifi = manager. getNetworkInfo (ConnectivityManager. TYPE_WIFI); </p> <P> Log. I (TAG, "network status changed:" + wifi. isConnected () + "3g:" + gprs. isConnected (); </p> <p> NetworkInfo info = intent. getParcelableExtra (ConnectivityManager. EXTRA_NETWORK_INFO); if (info! = Null) {Log. e ("H3c", "info. getTypeName () "+ info. getTypeName (); Log. e ("H3c", "getSubtypeName ()" + info. getSubtypeName (); Log. e ("H3c", "getState ()" + info. getState (); Log. e ("H3c", "getDetailedState ()" + info. getDetailedState (). name (); Log. e ("H3c", "getDetailedState ()" + info. getExtraInfo (); Log. e ("H3c", "getType ()" + info. getType (); if (NetworkInfo. state. CONNECTED = info. getState () {} else if (info. getType () = 1) {if (NetworkInfo. state. DISCONNECTING = info. getState () {}}}}</p>