用kotlin写一个函数或者模块,让安卓可以使用ntpclient更新自己的时间,并给出使用这个函数或者模块需要添加的依赖和权限
时间: 2023-06-25 21:03:19 浏览: 190
以下是一个使用 Kotlin 编写的获取时间的函数,并且可以使用 NTPClient 更新时间:
```
import android.os.SystemClock
import android.util.Log
import java.net.InetAddress
import java.net.SocketException
import java.net.UnknownHostException
import java.util.*
private const val TAG = "NTP"
/**
* 获取 NTP 时间
* @param ntpHost NTP 服务器地址
* @return 更新时间是否成功
*/
fun updateNtpTime(ntpHost: String): Boolean {
try {
val address = InetAddress.getByName(ntpHost)
val ntpTime = NtpClient().getTime(address)
if (ntpTime > 0) {
SystemClock.setCurrentTimeMillis(ntpTime)
Log.d(TAG, "Update time success: $ntpTime")
return true
}
} catch (e: Exception) {
Log.e(TAG, "Update time failed", e)
}
return false
}
/**
* NTP 客户端
*/
private class NtpClient {
private val NTP_PACKET_SIZE = 48
private val OFFSET_TRANSMIT_TIME = 40
private val OFFSET_RECEIVE_TIME = 32
private val OFFSET_REFERENCE_TIME = 16
private val TIMEOUT = 5000
private var mSocket: MyDatagramSocket? = null
/**
* 获取 NTP 时间
* @param address NTP 服务器地址
* @return NTP 时间
* @throws Exception 获取 NTP 时间的过程中可能会出现异常
*/
@Throws(Exception::class)
fun getTime(address: InetAddress): Long {
try {
mSocket = MyDatagramSocket()
mSocket?.connect(address, 123)
val request = ByteArray(NTP_PACKET_SIZE)
request[0] = 0x1B.toByte()
val sendTime = System.currentTimeMillis()
val time = mSocket?.send(MyDatagramPacket(request, request.size))
if (time != request.size) {
throw Exception("NTP send failed")
}
val response = ByteArray(NTP_PACKET_SIZE)
val receivePacket = MyDatagramPacket(response, response.size)
mSocket?.soTimeout = TIMEOUT
mSocket?.receive(receivePacket)
val receiveTime = System.currentTimeMillis()
val transmitTime = getTransmitTime(response)
return receiveTime + (transmitTime - sendTime)
} catch (e: Exception) {
throw e
} finally {
mSocket?.close()
}
}
/**
* 获取传输时间
* @param response NTP 服务器响应的数据
* @return 传输时间
*/
private fun getTransmitTime(response: ByteArray): Long {
val time = ByteArray(8)
for (i in 0..7) {
time[i] = response[OFFSET_TRANSMIT_TIME + i]
}
var seconds = 0L
var fraction = 0L
for (i in 0..3) {
seconds = seconds shl 8 or (time[i] and 0xffL)
}
for (i in 4..7) {
fraction = fraction shl 8 or (time[i] and 0xffL)
}
return seconds * 1000 + fraction * 1000 / 0x100000000L
}
}
/**
* 自定义 DatagramPacket
*/
private class MyDatagramPacket(
internal var buf: ByteArray,
internal var length: Int,
internal var address: InetAddress? = null,
internal var port: Int = 0
)
/**
* 自定义 DatagramSocket
*/
private class MyDatagramSocket {
private lateinit var mSocket: java.net.DatagramSocket
constructor() {
mSocket = java.net.DatagramSocket()
}
constructor(port: Int) {
mSocket = java.net.DatagramSocket(port)
}
fun bind(address: InetAddress, port: Int) {
mSocket.bind(java.net.InetSocketAddress(address, port))
}
val localAddress: InetAddress
get() = mSocket.localAddress
fun send(packet: MyDatagramPacket): Int {
val mPacket = java.net.DatagramPacket(packet.buf, packet.length, packet.address, packet.port)
mSocket.send(mPacket)
return mPacket.length
}
fun receive(packet: MyDatagramPacket) {
val mPacket = java.net.DatagramPacket(packet.buf, packet.length)
mSocket.receive(mPacket)
packet.address = mPacket.address
packet.port = mPacket.port
packet.length = mPacket.length
}
fun setSoTimeout(timeout: Int) {
mSocket.soTimeout = timeout
}
fun connect(address: InetAddress, port: Int) {
mSocket.connect(address, port)
}
fun close() {
mSocket.close()
}
}
```
为了使用此函数,你需要添加以下依赖和权限到你的 `build.gradle` 文件中:
```
dependencies {
implementation 'com.google.android.material:material:1.2.0'
// NTPClient
implementation 'commons-net:commons-net:3.6'
}
android {
// Internet 权限
uses-permission android:name="android.permission.INTERNET"
}
```
之后,你就可以在 Kotlin 文件中使用 `updateNtpTime` 函数来更新时间了。
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