Android的无线广播接收器工作不正常 [英] Android Wifi broadcast receiver not working as expected

问题描述

我要得到的WiFi SSID，每当手机连接到新的WiFi网络。我注册了以下

 接收器`registerReceiver（this.mybroadcast，新的IntentFilter（WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION））;`
 

的code这部分完美的作品。但在的onReceive 方法

 的NetworkInfo信息= intent.getParcelableExtra（WifiManager.EXTRA_WIFI_INFO））;
 

总是返回null。我试过 EXTRA_NETWORK_INFO 为好，但它也返回null。

我不能使用

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

作为服务将停止/启动n分钟后使用，这将产生对服务的每次重新启动时。

任何想法，我怎么能解决这个问题呢？

解决方案

的您可以在活动中创建广播的

  

第1步：

  @覆盖
    公共无效onResume（）{
        registerReceiver（）;
        super.onResume（）;
    }

 私人无效registerReceiver（）{
        IntentFilter的过滤器=新的IntentFilter（）;
        filter.addAction（ConnectivityManager.CONNECTIVITY_ACTION）;
        filter.addAction（WifiManager.SUPPLICANT_STATE_CHANGED_ACTION）;
        registerReceiver（mReceiver，过滤器）;
    }
 

  

第2步

 私人的BroadcastReceiver mReceiver =新的BroadcastReceiver（）{
        @覆盖
        公共无效的onReceive（上下文的背景下，意图意图）{

            的NetworkInfo信息= intent.getParcelableExtra（WifiManager.EXTRA_NETWORK_INFO）;
            如果（资讯！= NULL）{
                如果（info.isConnected（））{
                    WifiManager wifiManager =（WifiManager）context.getSystemService（Context.WIFI_SERVICE）;
                    WifiInfo wifiInfo = wifiManager.getConnectionInfo（）;
                    串SSID = wifiInfo.getSSID（）;
                    如果（SSID！= NULL）{
                        如果（isConnectClicked）{
                          //你跟WIFI

                                               }
                                      }
                                         }

                               }
            } 其他 {
                如果（intent.getAction（）。等于（WifiManager.SUPPLICANT_STATE_CHANGED_ACTION））{
                    如果（intent.hasExtra（WifiManager.EXTRA_SUPPLICANT_ERROR））{

                  //连接失败


                    }
                }
             }
          }

    };
 

  

第3步

  @覆盖
    公共无效的onPause（）{
        unregisterReceiver（mReceiver）;
        super.onPause（）;
    }
 

I have to get the WiFi ssid whenever phone connects to new WiFi network. I registered the following

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

This part of code works perfectly. But in onReceive method,

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

always returns null. I tried EXTRA_NETWORK_INFO as well, but it also returns Null.

I can't use

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

as the service will stop/start after n minutes and using this will generate the event on every restart of service.

Any ideas that how can I solve this issue?

解决方案

You can create broadcast within the activity

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();
    }

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