[英]How to use socket in Android with Kotlin
我想使用 Kotlin 在 Android 中实现一些目标:
如果我单击应用程序上的按钮,应用程序会向 TCP 服务器(我用 python 编写)发送一个单词。 服务器将发回另一个单词,应用程序将显示一条 toast 消息。
这是我到目前为止所做的,我可以弄清楚发送部分,但我无法让它继续监听套接字以从服务器听到。
我正在尝试使用协程,但在网上找到所有资源后,这是我能得到的最好的。
另外,我不确定我是否以正确的方式设置 IP 地址。
预先感谢您的帮助!
'''
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val sendBtn = findViewById<Button>(R.id.sendBtn )
val ipBtn = findViewById<Button>(R.id.ipBtn)
val ipInput = findViewById<TextView>(R.id.ipInput)
var ipAddress: String = "192.168.0.101"
// Below is my attempt to keep listening to the socket, if commented, the sending would work.
// My guess is the IO thread is caught in the while loop so the other coroutines cannot use
// IO thread to send to the server.
CoroutineScope(IO).launch{
val socket = Socket(ipAddress, 9999)
var text = ""
while (true) {
text = BufferedReader(InputStreamReader(socket.inputStream)).readLine()
// if text is not null
// Toast.makeText(this@MainActivity, "Set IP", Toast.LENGTH_SHORT).show()
}
}
suspend fun sendMessage(message:String){
val socket = Socket(ipAddress, 9999)
socket.outputStream.write(message.toByteArray())
socket.close()
}
ipBtn.setOnClickListener {
Toast.makeText(this@MainActivity, "Set IP", Toast.LENGTH_SHORT).show()
ipAddress = ipInput.text.toString()
}
sendBtn .setOnClickListener {
CoroutineScope(IO).launch {
Log.d("TAG", "message")
sendMessage("record")
}
}
'''
要从 P2P Fist 发送数据,我们需要服务器和客户端。 在这里,Socket 充当通过网络发送和接收数据的端点。
class ServerClass() :Thread(){
lateinit var serverSocket:ServerSocket
lateinit var inputStream: InputStream
lateinit var outputStream: OutputStream
lateinit var socket: Socket
override fun run() {
try {
serverSocket = ServerSocket(8888)
socket = serverSocket.accept()
inputStream =socket.getInputStream()
outputStream = socket.getOutputStream()
}catch (ex:IOException){
ex.printStackTrace()
}
val executors = Executors.newSingleThreadExecutor()
val handler = Handler(Looper.getMainLooper())
executors.execute(Runnable{
kotlin.run {
val buffer = ByteArray(1024)
var byte:Int
while (true){
try {
byte = inputStream.read(buffer)
if(byte > 0){
var finalByte = byte
handler.post(Runnable{
kotlin.run {
var tmpMeassage = String(buffer,0,finalByte)
Log.i("Server class","$tmpMeassage")
}
})
}
}catch (ex:IOException){
ex.printStackTrace()
}
}
}
})
}
fun write(byteArray: ByteArray){
try {
Log.i("Server write","$byteArray sending")
outputStream.write(byteArray)
}catch (ex:IOException){
ex.printStackTrace()
}
}
}
class ClientClass(hostAddress: InetAddress): Thread() {
var hostAddress: String = hostAddress.hostAddress
lateinit var inputStream: InputStream
lateinit var outputStream: OutputStream
lateinit var socket: Socket
fun write(byteArray: ByteArray){
try {
outputStream.write(byteArray)
}catch (ex:IOException){
ex.printStackTrace()
}
}
override fun run() {
try {
socket = Socket()
socket.connect(InetSocketAddress(hostAddress,8888),500)
inputStream = socket.getInputStream()
outputStream = socket.getOutputStream()
}catch (ex:IOException){
ex.printStackTrace()
}
val executor = Executors.newSingleThreadExecutor()
var handler =Handler(Looper.getMainLooper())
executor.execute(kotlinx.coroutines.Runnable {
kotlin.run {
val buffer =ByteArray(1024)
var byte:Int
while (true){
try{
byte = inputStream.read(buffer)
if(byte>0){
val finalBytes = byte
handler.post(Runnable{
kotlin.run {
val tmpMeassage = String(buffer,0,finalBytes)
Log.i("client class", tmpMeassage)
}
})
}
}catch (ex:IOException){
ex.printStackTrace()
}
}
}
})
}
}
确保服务器和客户端端口应该相同,这是双向通信,我们可以在双方传输数据。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.