Android 判断是否能真正上网(避免连入wifi无网的状态)

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

/***检测网络是否连接**@return*/privateboolean 
isNetworkAvailable() {//得到网络连接信息ConnectivityManagermanager = (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;}