Android gets around AP info (bottom)

Questions:

In the previous article, there was another problem: Wifimanager's Startscan () method is returned immediately, which means that the method calls a thread that scans the WiFi signal, so when does this scan end? When do we call Wifimanager's Getscanresults () to get the scan results?

Answer:

When the Wifimanager Startscan () method is called, the system emits a wifimanager.scan_results_available_action broadcast after the scan is finished. So we just have to set a broadcastrecever to accept the broadcast on the line. My mobile phone test, almost scan to spend about 1s.

1. Define a broadcastrecever to process the scan results, and when the scan is finished, the OnReceive () method is called.

Note: wifimanager.scan_results_available_action This listener, if there is wifi available, and there is no WiFi, will automatically trigger the OnReceive () method, once the connection is successful is not executed.

1 //result processing class after WiFi scan is finished2     Private Final classWifireceiverextendsbroadcastreceiver{3         //This method is triggered when the scan is finished4          Public voidOnReceive (Context context, Intent Intent) {5List<scanresult> scanlist =wm.getscanresults ();6              for(Scanresult scanresult:scanlist) {7                 //actions on the scan results8                         9             }Ten         } One}

2, registration services, cancellation services. It is recommended that the services be registered and unregistered in Onresume () and OnPause () respectively.

1      Public voidOnresume () {2         Super. Onresume ();3Registerreceiver (Wifireceiver,NewIntentfilter (wifimanager.scan_results_available_action));//Registration Services4     }5     protected voidOnPause () {6         Super. OnPause ();7Unregisterreceiver (Wifireceiver);//Cancel Registration8}