Android 判断是否能真正上网的实例详解

/** * 检测网络是否连接 * * @return */privateboolean 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) {    returnmanager.getActiveNetworkInfo().isAvailable();  }  returnfalse;}

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;}