Android应用程序Wi-Fi设备 - AP连接

Question

我正在构建一个可以在移动设备和Wi-Fi设备之间传输数据的应用程序......移动设备已启用AP(通过代码),另一台设备连接到此特定网络...如何通过代码检测到查看连接到网络(AP)的设备的详细信息？**是否有解决方案？

我在HTC Desire中看到了一个名为Wifi Hot spot的应用程序,它具有显示连接到网络的设备的IP地址的功能.怎么能实现这一目标？

查看评论:HTC EVO 4G上的Sprint Mobile Hotspot.

它显示了一个可以实际显示已连接用户的应用程序.我们怎么能以编程方式做到这一点？那有API吗？

用于创建接入点:

private void createWifiAccessPoint() {
    if (wifiManager.isWifiEnabled())
    {
        wifiManager.setWifiEnabled(false);
    }
    Method[] wmMethods = wifiManager.getClass().getDeclaredMethods(); //Get all declared methods in WifiManager class
    boolean methodFound = false;

    for (Method method: wmMethods){
        if (method.getName().equals("setWifiApEnabled")){
            methodFound = true;
            WifiConfiguration netConfig = new WifiConfiguration();
            netConfig.SSID = "\""+ssid+"\"";
            netConfig.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);
            //netConfig.allowedProtocols.set(WifiConfiguration.Protocol.RSN);
            //netConfig.allowedProtocols.set(WifiConfiguration.Protocol.WPA);
            //netConfig.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
            //netConfig.preSharedKey = password;
            //netConfig.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
            //netConfig.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
            //netConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
            //netConfig.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);

            try {
                boolean apstatus = (Boolean) method.invoke(wifiManager, netConfig,true);
                //statusView.setText("Creating a Wi-Fi Network \""+netConfig.SSID+"\"");
                for (Method isWifiApEnabledmethod: wmMethods)
                {
                    if (isWifiApEnabledmethod.getName().equals("isWifiApEnabled")){
                        while (!(Boolean)isWifiApEnabledmethod.invoke(wifiManager)){
                        };
                        for (Method method1: wmMethods){
                            if(method1.getName().equals("getWifiApState")){
                                int apstate;
                                apstate = (Integer)method1.invoke(wifiManager);
                                //                      netConfig = (WifiConfiguration)method1.invoke(wifi);
                                //statusView.append("\nSSID:"+netConfig.SSID+"\nPassword:"+netConfig.preSharedKey+"\n");
                            }
                        }
                    }
                }

                if(apstatus)
                {
                    System.out.println("SUCCESSdddd");
                    //statusView.append("\nAccess Point Created!");
                    //finish();
                    //Intent searchSensorsIntent = new Intent(this,SearchSensors.class);
                    //startActivity(searchSensorsIntent);
                }
                else
                {
                    System.out.println("FAILED");

                    //statusView.append("\nAccess Point Creation failed!");
                }
            }
            catch (IllegalArgumentException e) {
                e.printStackTrace();
            }
            catch (IllegalAccessException e) {
                e.printStackTrace();
            }
            catch (InvocationTargetException e) {
                e.printStackTrace();
            }
        }
    }
    if (!methodFound){
        //statusView.setText("Your phone's API does not contain setWifiApEnabled method to configure an access point");
    }
}

Answer 1

您可以读取该/proc/net/arp文件以读取所有ARP条目.请参阅Android博客文章中的示例:如何查找远程主机的硬件MAC地址.在ARP表中,根据IP地址搜索属于您的Wi-Fi网络的所有主机.

以下是示例代码,用于计算连接到AP的主机数.此代码假定一个ARP条目用于连接到网络的电话,其余ARP条目来自连接到AP的主机.

private int countNumMac()
{
    int macCount = 0;
    BufferedReader br = null;
    try {
        br = new BufferedReader(new FileReader("/proc/net/arp"));
        String line;
        while ((line = br.readLine()) != null) {
            String[] splitted = line.split(" +");
            if (splitted != null && splitted.length >= 4) {
                // Basic sanity check
                String mac = splitted[3];
                if (mac.matches("..:..:..:..:..:..")) {
                    macCount++;
                }
            }
        }
    }
    catch (Exception e) {
        e.printStackTrace();
    }
    finally {
        try {
            br.close();
        }
        catch (IOException e) {
            e.printStackTrace();
        }
    }

    if (macCount == 0)
        return 0;
    else
        return macCount-1; //One MAC address entry will be for the host.
}

Answer 2

如果您知道其主机名或IP地址,则可以ping设备.

    Runtime runtime = Runtime.getRuntime();
    Process proc = runtime.exec("ping -c 1   " + hostname);
    proc.waitFor();

您可以进行IP地址扫描,使用上面的ping或尝试使用TCP或UDP进行连接,尝试网络上的每个IP地址进行响应.

如果您知道MAC地址,则可以使用ARP表.

如果您在设备上运行了自己的软件,则可以在每台设备上发送UDP数据包并在Android设备上进行监听.有关如何执行此操作,请参阅在Android中发送和接收UDP广播数据包.