Android 判断是否能真正上网的实例详解

/**

 *
 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;

}