Android 判断是否能真正上网的实例详解

android 判断是否能真正上网的实例详解

 检测网络是否连接

实现代码：

/**

 *
 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;

}

 ping的状态

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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