Android 判断是否能真正上网(避免连入wifi无网的状态)

转自：http://blog.csdn.net/alien__chao/article/details/52184236

/**

 *
 检测网络是否连接

 *

 *
 @return

 */

private

boolean 
isNetworkAvailable() {

    //
 得到网络连接信息

    ConnectivityManager
 manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

    //
 去进行判断网络是否连接

    if

(manager.getActiveNetworkInfo() != null)
 {

        return

manager.getActiveNetworkInfo().isAvailable();

    }

    return

false;

}

public static final boolean ping() {

    String result = null;
    try {
        String ip = "www.baidu.com";// ping 的地址，可以换成任何一种可靠的外网
        Process p = Runtime.getRuntime().exec("ping -c 3 -w 100 " + ip);// ping网址3次
        // 读取ping的内容，可以不加
        InputStream input = p.getInputStream();
        BufferedReader in = new BufferedReader(new InputStreamReader(input));
        StringBuffer stringBuffer = new StringBuffer();
        String content = "";
        while ((content = in.readLine()) != null) {
            stringBuffer.append(content);
        }
        Log.d("------ping-----", "result content : " + stringBuffer.toString());
        // ping的状态
        int status = p.waitFor();
        if (status == 0) {
            result = "success";
            return true;
        } else {
            result = "failed";
        }
    } catch (IOException e) {
        result = "IOException";
    } catch (InterruptedException e) {
        result = "InterruptedException";
    } finally {
        Log.d("----result---", "result = " + result);
    }
    return false;

}

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