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

1. <nobr>    public static boolean isNetworkConnected(Context context)
2. {
3. ConnectivityManager connMag = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
4. NetworkInfo activeNetworkInfo = connMag.getActiveNetworkInfo();
5. if(activeNetworkInfo != null){
6. return activeNetworkInfo.isAvailable();
7. }
8. return false;
9. }</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;
    }