android 网络

Android 判断网络

文章分类:移动开发
函数用于判断网络是否可用
 
Java代码 
/*  
*@return boolean return true if the application can access the internet  
*/   
private boolean haveInternet(){    
    NetworkInfo info=(ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE).getActiveNetworkInfo();    
    if(info==null || !info.isConnected()){    
        return false;    
    }    
    if(info.isRoaming()){    
        //here is the roaming option you can change it if you want to disable internet while roaming, just return false    
        return true;    
    }    
    return true;    
}   
 
 
另一种方法
 
Java代码 
public boolean isNetworkAvailable() {    
   Context context = getApplicationContext();    
   ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);    
   if (connectivity == null) {    
      boitealerte(this.getString(R.string.alert),"getSystemService rend null");    
   } else {    
      NetworkInfo[] info = connectivity.getAllNetworkInfo();    
      if (info != null) {    
         for (int i = 0; i < info.length; i++) {    
            if (info[i].getState() == NetworkInfo.State.CONNECTED) {    
               return true;    
            }    
         }    
      }    
   }    
   return false;    
}