Android 的wifi状态可以分为两大类,两者均可通过广播监听,相应的Action在WifiManager类中:

 

第一类:有无wifi源及各个状态间转变

可监听 WIFI_STATE_CHANGED_ACTION(如下图所示,双击图片可放大)

有五种情况:

1-1 disabled

1-2 disabling

1-3 enable

1-4 enabling

1-5 unknown

 

可通过不同的Extra值,见下图(双击可放大)获得状态常量:

代码如下:

  1. if (WifiManager.WIFI_STATE_CHANGED_ACTION.equals(action)) {//在此监听wifi有无 
  2.             int wifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, 0); 
  3.              
  4.             switch (wifiState) { 
  5.             case WifiManager.WIFI_STATE_DISABLED: 
  6.                 updateWifiStatus(R.drawable.wifi_disable); 
  7.                 Toast.makeText(mContext, R.string.wifi_disable, 
  8.                         Toast.LENGTH_LONG).show(); 
  9.                 break
  10.             case WifiManager.WIFI_STATE_DISABLING: 
  11.                 break
  12.             case WifiManager.WIFI_STATE_ENABLED: 
  13.                 updateWifiStatus(R.drawable.wifi_enable); 
  14.                 Toast.makeText(mContext, R.string.wifi_enable, 
  15.                         Toast.LENGTH_LONG).show(); 
  16.                 break
  17.             case WifiManager.WIFI_STATE_ENABLING: 
  18.                 break
  19.             case WifiManager.WIFI_STATE_UNKNOWN: 
  20.                 break
  21.             } 
  22.         }  

 

也可通过以下代码实现:

  1. //另外一种方式 
  2.         mWifiMng = (WifiManager) mContext 
  3.                 .getSystemService(mContext.WIFI_SERVICE); 
  4.          
  5.         switch (mWifiMng.getWifiState()) { 
  6.         case WifiManager.WIFI_STATE_DISABLED: 
  7.             updateWifiStatus(R.drawable.wifi_disable); 
  8.             Toast.makeText(mContext, R.string.wifi_disable, 
  9.                     Toast.LENGTH_LONG).show(); 
  10.             break
  11.         case WifiManager.WIFI_STATE_DISABLING: 
  12.             break
  13.         case WifiManager.WIFI_STATE_ENABLED: 
  14.             updateWifiStatus(R.drawable.wifi_enable); 
  15.             Toast.makeText(mContext, R.string.wifi_enable, 
  16.                     Toast.LENGTH_LONG).show(); 
  17.             break
  18.         case WifiManager.WIFI_STATE_ENABLING: 
  19.             break
  20.         case WifiManager.WIFI_STATE_UNKNOWN: 
  21.             break
  22.         } 

 

第二类:wifi是否连接正常

 

可监听:NETWORK_STATE_CHANGED_ACTION(如下图所示,双击图片可放大)

有两种状况:

2-1连接

2-1未连接

在OnReceiver方法中,通过不同Extra值,获得连接状况,如下图,双击图片放大:

代码如下: 

  1. if (WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(action)) {  
  2.             Parcelable parcelableExtra = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);  
  3.             if (null != parcelableExtra) {  
  4.                 NetworkInfo networkInfo = (NetworkInfo) parcelableExtra;  
  5.                 boolean isConnected = networkInfo.isAvailable();  
  6.                 updateNetworkStatus();  
  7.             }  
  8.         }