利用Android自帶的ConnectivityManager類(lèi)
有時(shí)候連上了wifi，但這個(gè)wifi是上不了網(wǎng)的，我們可以通過(guò)ping www.baidu.com來(lái)判斷是否可以上網(wǎng)
也可以利用get請(qǐng)求訪問(wèn)www.baidu.com，如果get請(qǐng)求成功，說(shuō)明可以上網(wǎng)

1、判斷網(wǎng)絡(luò)是否已經(jīng)連接

// check all network connect, WIFI or mobile
public static boolean isNetworkAvailable(final Context context) {
  boolean hasWifoCon = false;
  boolean hasMobileCon = false;
 
  ConnectivityManager cm = (ConnectivityManager) context.getSystemService(context.CONNECTIVITY_SERVICE);
  NetworkInfo[] netInfos = cm.getAllNetworkInfo();
  for (NetworkInfo net : netInfos) {
 
    String type = net.getTypeName();
    if (type.equalsIgnoreCase("WIFI")) {
      LevelLogUtils.getInstance().i(tag, "get Wifi connection");
      if (net.isConnected()) {
        hasWifoCon = true;
      }
    }
 
    if (type.equalsIgnoreCase("MOBILE")) {
      LevelLogUtils.getInstance().i(tag, "get Mobile connection");
      if (net.isConnected()) {
        hasMobileCon = true;
      }
    }
  }
  return hasWifoCon || hasMobileCon;
 
}

2、利用 ping 判斷 Internet 能夠請(qǐng)求成功
Note：有時(shí)候連上了網(wǎng)絡(luò), 但卻上不去外網(wǎng)

// network available cannot ensure Internet is available
public static boolean isNetWorkAvailable(final Context context) {
  Runtime runtime = Runtime.getRuntime();
  try {
    Process pingProcess = runtime.exec("/system/bin/ping -c 1 www.baidu.com");
    int exitCode = pingProcess.waitFor();
    return (exitCode == 0);
  } catch (Exception e) {
    e.printStackTrace();
  }
  return false;
}

考慮到網(wǎng)絡(luò), 我們 ping 了www.baidu.com
國(guó)外的話(huà)可以 ping 8.8.8.8

3、其他方案模擬 get 請(qǐng)求

也可以訪問(wèn)網(wǎng)址, 看 get 請(qǐng)求能不能成功

URL url = new URL("http://www.google.com");
HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
urlc.setConnectTimeout(3000);
urlc.connect();
if (urlc.getResponseCode() == 200) {
  return new Boolean(true);
}

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家學(xué)習(xí)Android軟件編程有所幫助。

您可能感興趣的文章: