【发布时间】:2014-05-25 10:44:23
【问题描述】:
目标-我需要在 wifi 上检测到我的 Brother QL-720NW 标签打印机,以便从我的应用程序进行打印。
我在 SO 上遇到过各种类似的问题,例如 Get the IP address of printer、How to connect a network printer over Android?、How to get IP adress of other hosts in same wifi network in android? 等
但是以上都没有完全解决我的问题。
使用这个 How to get IP address of the device from code? 我可以获取我的 wifi 网络上所有 IP 地址的列表。
代码:
String myIpAdd= getIPAddress(true);
ArrayList<InetAddress> inetAddresses=getConnectedDevices(myIpAdd);
public ArrayList<InetAddress> getConnectedDevices(String YourPhoneIPAddress) {
ArrayList<InetAddress> ret = new ArrayList<InetAddress>();
LoopCurrentIP = 0;
String IPAddress = "";
String[] myIPArray = YourPhoneIPAddress.split("\\.");
InetAddress currentPingAddr;
for (int i = 0; i <= 255; i++) {
try {
// build the next IP address
currentPingAddr = InetAddress.getByName(myIPArray[0] + "." +
myIPArray[1] + "." +
myIPArray[2] + "." +
Integer.toString(LoopCurrentIP));
// 50ms Timeout for the "ping"
if (currentPingAddr.isReachable(50)) {
ret.add(currentPingAddr);
}
} catch (UnknownHostException ex) {
ex.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
}
LoopCurrentIP++;
}
return ret;
}
/**
* Get IP address from first non-localhost interface
* @param ipv4 true=return ipv4, false=return ipv6
* @return address or empty string
*/
public static String getIPAddress(boolean useIPv4) {
try {
List<NetworkInterface> interfaces = Collections.list(NetworkInterface.getNetworkInterfaces());
for (NetworkInterface intf : interfaces) {
List<InetAddress> addrs = Collections.list(intf.getInetAddresses());
for (InetAddress addr : addrs) {
if (!addr.isLoopbackAddress()) {
String sAddr = addr.getHostAddress().toUpperCase();
boolean isIPv4 = InetAddressUtils.isIPv4Address(sAddr);
if (useIPv4) {
if (isIPv4)
return sAddr;
} else {
if (!isIPv4) {
int delim = sAddr.indexOf('%'); // drop ip6 port suffix
return delim<0 ? sAddr : sAddr.substring(0, delim);
}
}
}
}
}
} catch (Exception ex) {
ex.printStackTrace();
} // for now eat exceptions
return "";
}
如何从 IP 地址列表中检测我的打印机的 IP 地址??
请帮忙。
【问题讨论】:
标签: android networking printing android-wifi android-networking