java - How to send remote service message onclick via Messenger

Question

I'm really new on Android and Kotlin.I have one Server app and one Client app. I want to send string from Server to Client app.I can start Server and then bind with Client app to Server but i cannot send my message when button click. Here my Server :

 private inner class MessageRequestHandler : Handler() {
    override fun handleMessage(msg: Message) {
        when (msg.what) {
            SEND_MESSAGE_FLAG -> {
                val bundle = Bundle()
                bundle.putString("key", "Test")

                val mesg = Message.obtain(null, SEND_MESSAGE_FLAG)
                mesg.obj = bundle
                try {
                    msg.replyTo.send(mesg)
                } catch (e: RemoteException) {
                    Log.i(TAG, "Error: " + e.message)
                }                }
        }
        super.handleMessage(msg)
    }
}

private val messageMessenger: Messenger = Messenger(MessageRequestHandler())
override fun onBind(intent: Intent?): IBinder {
    return messageMessenger.binder
}

companion object {
    private val TAG = MyService::class.java.simpleName
    var SEND_MESSAGE_FLAG = 0
}

Here my Main activity of Server

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    serviceIntent = Intent(applicationContext, MyService::class.java)
}


fun sendLogin(view: View){
    startService(serviceIntent)
    Toast.makeText(applicationContext, "Service Started", Toast.LENGTH_SHORT).show()
}

fun sendPay(view: View){//When i press button i want to send message to Client from here
    Log.i(TAG, "Self Payment")
}

fun sendLogout(view: View){
    stopService(serviceIntent)
    Toast.makeText(applicationContext, "Service Stopped", Toast.LENGTH_SHORT).show()
}

Here my Client Main Activity

private var serviceIntent: Intent? = null
var requestMessenger: Messenger? = null
var receiveMessenger: Messenger? = null
private var mIsBound = false
private var messageValue = 0

companion object {
    const val GET_RANDOM_NUMBER_FLAG = 0
}

internal inner class recieveHandler : Handler() {
    override fun handleMessage(msg: Message) {
        messageValue = 0
        when (msg.what) {
            GET_RANDOM_NUMBER_FLAG -> {
                messageValue = msg.arg1 
                Toast.makeText(applicationContext,"Server: $messageValue",Toast.LENGTH_LONG).show()
                println(messageValue) 
            }
            else -> {
            }
        }
        super.handleMessage(msg)
    }
}

var serviceConnection: ServiceConnection? = object : ServiceConnection {
    override fun onServiceDisconnected(arg0: ComponentName) {
        requestMessenger = null
        receiveMessenger = null
        mIsBound = false
    }

    override fun onServiceConnected(arg0: ComponentName, binder: IBinder) {
        requestMessenger = Messenger(binder)
        receiveMessenger = Messenger(recieveHandler())
        mIsBound = true
    }
}


fun bindServer(v: View) {
    serviceConnection?.let { bindService(serviceIntent, it, BIND_AUTO_CREATE) }
    if (mIsBound){
        Toast.makeText(applicationContext, "Service bound", Toast.LENGTH_SHORT).show()
    }
    else{
        Toast.makeText(applicationContext, "Service not bound", Toast.LENGTH_SHORT).show()
    }

}

fun getMessage(view: View) {
    if (mIsBound) {
        val requestMessage = Message.obtain(null, GET_RANDOM_NUMBER_FLAG)
        requestMessage.replyTo = receiveMessenger
        try {
            requestMessenger!!.send(requestMessage)
        } catch (e: RemoteException) {
            e.printStackTrace()
        }
    } else {
        Toast.makeText(
            applicationContext,
            "Service Unbound, can't get message",
            Toast.LENGTH_SHORT
        ).show()
    }
}

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    serviceIntent = Intent()
    serviceIntent!!.component = ComponentName("com.my.server", "com.my.server.MyService")
}

What you can suggest me?

Answer 1

After 5 days challenging , i found way basically how to do.

1. I'm sending message from Activity to Service with EventBus here is example
2. Getting sent message with local variable in Service
3. Sending to another app