Android Wifi 广播接收器未按预期工作

Question

每当 phone 连接到新的 WiFi 网络时，我都必须获取 WiFi ssid。我注册了以下内容

receiver `registerReceiver(this.mybroadcast, new IntentFilter(WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION));`

这部分代码完美运行。但是在onReceive方法中，

NetworkInfo info = intent.getParcelableExtra(WifiManager.EXTRA_WIFI_INFO));

始终returns 为空。我也试过 EXTRA_NETWORK_INFO，但它也是 returns Null。

我不会用

this.registerReceiver(this.mybroadcast, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));,

因为服务将在 n 分钟后 stop/start 并且使用它会在每次重新启动服务时生成事件。

有什么办法可以解决这个问题吗？

Answer 1

您可以在 activity

内创建广播

Step 1 :

 @Override
    public void onResume() {
        registerReceiver();
        super.onResume();
    }

 private void registerReceiver() {
        IntentFilter filter = new IntentFilter();
        filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
        filter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION);
        registerReceiver(mReceiver, filter);
    }

Step 2

private BroadcastReceiver mReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {

            NetworkInfo info = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
            if (info != null) {
                if (info.isConnected()) {
                    WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
                    WifiInfo wifiInfo = wifiManager.getConnectionInfo();
                    String ssid = wifiInfo.getSSID();
                    if (ssid != null) {
                        if (isConnectClicked) {
                          //YOUR CONNECTED WITH WIFI

                                               } 
                                      }
                                         }

                               }
            } else {
                if (intent.getAction().equals(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION)) {
                    if (intent.hasExtra(WifiManager.EXTRA_SUPPLICANT_ERROR)) {

                  //Connection failed    


                    }
                }
             }
          }

    };

Step 3

 @Override
    public void onPause() {
        unregisterReceiver(mReceiver);
        super.onPause();
    }

Android Wifi 广播接收器未按预期工作

Android Wifi broadcast receiver not working as expected

android

broadcastreceiver

wifi