android中监听wifi广播的方法

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android中监听wifi广播有以下方法：

在清单xml文件里注册广播：

 <receiver android:name=".WifiReceiver" >         <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>     </receiver>

用java代码注册广播：

 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 WifiReceiver(), filter);

public class WifiReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) { if (WifiManager.WIFI_STATE_CHANGED_ACTION.equals(intent.getAction())) {//这个监听wifi的打开与关闭，与wifi的连接无关              int wifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, 0);               Log.i("WIFI状态", "wifiState"+wifiState);              switch (wifiState) {               case WifiManager.WIFI_STATE_DISABLED:                   break;               case WifiManager.WIFI_STATE_DISABLING:                   break;               case WifiManager.WIFI_STATE_ENABLING:                   break;               case WifiManager.WIFI_STATE_ENABLED:                   break;               case WifiManager.WIFI_STATE_UNKNOWN:                   break;               }           }  // 这个监听wifi的连接状态即是否连上了一个有效无线路由，当上边广播的状态是WifiManager.WIFI_STATE_DISABLING，和WIFI_STATE_DISABLED的时候，根本不会接到这个广播。  // 在上边广播接到广播是WifiManager.WIFI_STATE_ENABLED状态的同时也会接到这个广播，当然刚打开wifi肯定还没有连接到有效的无线      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;//当然，这边可以更精确的确定状态                  Log.i(this.getClass().getSimpleName(), "isConnected"+isConnected);                  if(isConnected){                  }else{                                        }              }            }      //这个监听网络连接的设置，包括wifi和移动数据的打开和关闭。.           //最好用的还是这个监听。wifi如果打开，关闭，以及连接上可用的连接都会接到监听。见log          // 这个广播的最大弊端是比上边两个广播的反应要慢，如果只是要监听wifi，我觉得还是用上边两个配合比较合适      if(ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())){      ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);       NetworkInfo gprs = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);       NetworkInfo wifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);       Log.i("CONNECTIVITY_ACTION", "网络状态改变:" + wifi.isConnected() + " 3g:" + gprs.isConnected());               NetworkInfo info = intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);          if (info != null) {              Log.i("CONNECTIVITY_ACTION", "info.getTypeName()"+info.getTypeName());              Log.i("CONNECTIVITY_ACTION", "getSubtypeName()"+info.getSubtypeName());              Log.i("CONNECTIVITY_ACTION", "getState()"+info.getState());              Log.i("CONNECTIVITY_ACTION",                                  "getDetailedState()"+info.getDetailedState().name());              Log.i("CONNECTIVITY_ACTION", "getDetailedState()"+info.getExtraInfo());              Log.i("CONNECTIVITY_ACTION", "getType()"+info.getType());          }       }             }}

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