关于在android上面的联网判断

具体如下：

• 注意联网的权限
• 注意对手机网络的监听
• 对WiFi是否可用的判断

代码实现如下：

 /**
 * Created by chen on 15-9-5.
 */
 public class ConnectionDetector {

  public static boolean isConnectingToInternet(Context context) {
    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

    if (connectivityManager == null) {
    } else {
        NetworkInfo[] info = connectivityManager.getAllNetworkInfo();
        if (info != null)
            for (int i = 0; i < info.length; i++)
                if (info[i].getState() == NetworkInfo.State.CONNECTED) {
                    if (ping()) {
                        if (info[i].getType() == ConnectivityManager.TYPE_MOBILE) {
                            Log.d("TYPE","手机");
                        } else {
                            Log.d("TYPE","wifi");
                        }
                        return true;
                    }
                }
    }
    return false;
}

 //wifi连接上，但网络不可用的判断，ping外网

 public static  boolean ping() {

    String result = null;
    try {
        String ip = "www.baidu.com";
        Process p = Runtime.getRuntime().exec("ping -c 3 -w 100 " + ip);
        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("the result is ",result);
    }
    return false;
}

 public static void isNetwork(Context context) {
    boolean isOnline = isConnectingToInternet(context);
    if (!isOnline) {
        Toast.makeText(context, R.string.is_online, Toast.LENGTH_SHORT).show();
    }
  }

}