ConnectivityManager详解

常用方法:

1.监听网络连接(Wi-Fi, GPRS, UMTS, etc),当网络发生改变时发送广播(broadcase)进行通知

2.通过该类查询网络连接状态

常用方法:

getActiveNetworkInfo()  返回NetworkInfo，当前网络连接的信息

getNetworkInfo(int networkType) 返回一个指定网络的连接信息

getNetworkPreference() 返回首选网络连接的网络类型

setNetworkPreference(int preference)设置首选网络连接的网络类型

例子：判断当前网络连接状态

<nobr>    public static boolean isNetworkConnected(Context context)
    {
        ConnectivityManager connMag = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo activeNetworkInfo = connMag.getActiveNetworkInfo();
        if(activeNetworkInfo != null){
           return activeNetworkInfo.isAvailable();
        }
        return false;
    }</nobr>

    public static boolean isNetworkConnected(Context context)
    {
    	ConnectivityManager connMag = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    	
    	NetworkInfo activeNetworkInfo = connMag.getActiveNetworkInfo(); 
    	if(activeNetworkInfo != null){
    	   return activeNetworkInfo.isAvailable();ConnectivityManager详解 
    	}
    	return false;
    }