android 网络广播 类似QQ动态检查网络

    private ConnectivityManager mConnectivityManager;  
    private NetworkInfo netInfo; 

在onCreate 注册广播

 IntentFilter mFilter = new IntentFilter();  mFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION); registerReceiver(myNetReceiver, mFilter);

一定要在onDestroy()方法注销广播
    @Override
    public void onDestroy() { 
        super.onDestroy();
        if(myNetReceiver!=null){ 
               unregisterReceiver(myNetReceiver); 
        }
    }


rl_error_item是布局文件类似QQ列表显示的未连接网络状态XML布局

    private BroadcastReceiver myNetReceiver = new BroadcastReceiver() { 
           
         @Override 
         public void onReceive(Context context, Intent intent) { 
             
          String action = intent.getAction(); 
                if (action.equals(ConnectivityManager.CONNECTIVITY_ACTION)) { 
                      
                    mConnectivityManager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE); 
                    netInfo = mConnectivityManager.getActiveNetworkInfo();   
                    if(netInfo != null && netInfo.isAvailable()) {  
                         //网络连接 
                        String name = netInfo.getTypeName();  
                        if(netInfo.getType()==ConnectivityManager.TYPE_WIFI || netInfo.getType()==ConnectivityManager.TYPE_ETHERNET || netInfo.getType()==ConnectivityManager.TYPE_MOBILE){ 
                            //3g网络 
                              rl_error_item.setVisibility(View.GONE);
                        } 
                      } else { 
                          //网络断开  
                          rl_error_item.setVisibility(View.VISIBLE);
                    } 
                } 
           
           }  
    };