android - Android 中的设备发现

Question

我正在尝试创建一个可以找到局域网中所有设备的应用程序。我已经能够通过 ping IP 范围来做到这一点。还有其他方法可以做到这一点吗？

是否可以通过监听 android 中的传入数据包来检测同一网络中的设备？

Answer 1

以下代码将搜索设备并将其信息放入列表中:-

     //an array list of DeviceList type, which will take the info from getter setters
    ArrayList<DeviceList> Dlist = new ArrayList<DeviceInfo>();
    wifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
    if(wifi.isWifiEnabled()){

    List<ScanResult>wifilist =wifi.getScanResults();  

    if(wifilist != null){
    for(int m = 0; m < wifilist.size(); m++)
    {
        int signallevel = WifiManager.calculateSignalLevel(wifilist.get(m).level,20);
        int signalStrength=(signallevel*100)/20;
        DeviceList dInfo = new DeviceList();
        dInfo.setDeviceName((wifilist.get(m).SSID));
        dInfo.setSignalStrength(String.valueOf((signalStrength+"%")));
        dInfo.setDeviceType("WiFi");

        Dlist.add(dInfo);
    }
}     

为此你需要一些 getter setter。您可以将它们添加到不同的类中，如下所示:-

 public class DeviceList {

  String DeviceName="";
  String SignalStrength="";
  String deviceType="";

  public String getDeviceName() {
   return DeviceName;
  }
  public void setDeviceName(String deviceName) {
   DeviceName = deviceName;
  }
  public String getSignalStrength() {
   return SignalStrength;
  }
  public void setSignalStrength(String signalStrength) {
   SignalStrength = signalStrength;
  }
  public String getDeviceType() {
   return deviceType;
  }
  public void setDeviceType(String deviceType) {
   this.deviceType = deviceType;
  }
 }