Android網絡相關輔助類 NetUtils

 import android.app.Activity;

import android.content.ComponentName;

import android.content.Context;

import android.content.Intent;

import android.net.ConnectivityManager;

import android.net.NetworkInfo;

/**

跟網絡相關的工具類 


*/

public class NetUtils

{

private NetUtils()

{

/* cannot be instantiated */  
throw new UnsupportedOperationException("cannot be instantiated");  

}
/**

判斷網絡是否連接 

@param context 
@return 
*/

public static boolean isConnected(Context context)

{
ConnectivityManager connectivity = (ConnectivityManager) context

     .getSystemService(Context.CONNECTIVITY_SERVICE);  


if (null != connectivity)

 {

 NetworkInfo info = connectivity.getActiveNetworkInfo();  
 if (null != info && info.isConnected())  
 {  
     if (info.getState() == NetworkInfo.State.CONNECTED)  
     {  
         return true;  
     }  
 }  

}

 return false;

}


/**

判斷是否是wifi連接 
*/

public static boolean isWifi(Context context)

{

 ConnectivityManager cm = (ConnectivityManager) context

     .getSystemService(Context.CONNECTIVITY_SERVICE);  


if (cm == null)

 return false;  

return cm.getActiveNetworkInfo().getType() == ConnectivityManager.TYPE_WIFI;


}
/**

打開網絡設置界面 
*/

public static void openSetting(Activity activity)

{

 Intent intent = new Intent("/");

 ComponentName cm = new ComponentName("com.android.settings",  
     "com.android.settings.WirelessSettings");  

 intent.setComponent(cm);

 intent.setAction("android.intent.action.VIEW");

 activity.startActivityForResult(intent, 0);

}  



}  </pre>