안드로이드 스레드 종료하기

Question

 

btnRestart를 누르면 쓰레드를 다시 시작합니다.

그런데 버튼을 누른 만큰 쓰레드가 생성되는거 같습니다. 쓰레드를 종료하고 싶은데 어떻게 해야하나요?

 

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

        baseLayout = findViewById(R.id.baseLayout)
        imgGame = findViewById(R.id.imgGame)
        imgR = findViewById(R.id.imgR)
        imgS = findViewById(R.id.imgS)
        imgP = findViewById(R.id.imgP)
        btnRestart = findViewById(R.id.btnRestart)
        var win = 0
        handler = object : Handler(mainLooper){
            override fun handleMessage(msg: Message) {
                when(msg.what){
                    MSG_A->{
                        imgGame.setImageResource(R.drawable.p)
                        win=1
                    }
                    MSG_B->{
                        imgGame.setImageResource(R.drawable.r)
                        win=2
                    }
                    MSG_C->{
                        imgGame.setImageResource(R.drawable.s)
                        win=3
                    }
                }
            }
        }
        btnRestart.setOnClickListener {
            btnRestart.setText("다시하기")
            runThread()
        }
        imgR.setOnClickListener {
            if(win==1) {
                count = 3
                Toast.makeText(applicationContext, "졌어요", Toast.LENGTH_SHORT).show()
            }
            if(win==2) {
                count = 3
                Toast.makeText(applicationContext, "비겼어요", Toast.LENGTH_SHORT).show()
            }
            if(win==3) {
                count = 3
                Toast.makeText(applicationContext, "이겼어요", Toast.LENGTH_SHORT).show()
            }
        }
        imgS.setOnClickListener {
            if(win==1) {
                count = 3
                Toast.makeText(applicationContext, "이겼어요", Toast.LENGTH_SHORT).show()
            }
            if(win==2) {
                count = 3
                Toast.makeText(applicationContext, "졌어요", Toast.LENGTH_SHORT).show()
            }
            if(win==3) {
                count = 3
                Toast.makeText(applicationContext, "비겼어요", Toast.LENGTH_SHORT).show()
            }
        }
        imgP.setOnClickListener {
            if(win==1) {
                count = 3
                Toast.makeText(applicationContext, "비겼어요", Toast.LENGTH_SHORT).show()
            }
            if(win==2) {
                count = 3
                Toast.makeText(applicationContext, "이겼어요", Toast.LENGTH_SHORT).show()
            }
            if(win==3) {
                count = 3
                Toast.makeText(applicationContext, "졌어요", Toast.LENGTH_SHORT).show()
            }
        }
        runThread()
    }
    override fun onCreateOptionsMenu(menu: Menu?): Boolean {
        super.onCreateOptionsMenu(menu)
        var mInflater = menuInflater
        mInflater.inflate(R.menu.menu,menu)
        return true
    }
    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        super.onOptionsItemSelected(item)
        when(item.itemId){
            R.id.coin ->{
                var intent = Intent(this,Coin::class.java )
                startActivity(intent)
                finish()
                return true
            }
            R.id.RSP ->{
                var intent = Intent(this,Game::class.java )
                startActivity(intent)
                finish()
                return true
            }
        }
        return false
    }
    private fun runThread(){
        count=0
        newThread = Thread(object : Runnable {
            override fun run(){
                while(true){
                    if(count==3)
                        newThread.interrupt()
                    val message = handler.obtainMessage()
                    if(count==0){
                        message.what = MSG_A
                        handler.sendMessage(message)
                        sleep(1000)
                        count++
                    }else if(count==1){
                        message.what = MSG_B
                        handler.sendMessage(message)
                        sleep(1000)
                        count++
                    }else if(count==2) {
                        message.what = MSG_C
                        handler.sendMessage(message)
                        count=0
                        sleep(1000)
                    }
                }
            }
        })
        newThread.start()
    }

 

 

 

Answer 1

Boolean flag 를 두어 while 문을 종료하게 하던가 좀 더 유연하게 컨트롤 하시려면 Corountine을 사용하세요.

private var shouldRun = AtomicBoolean(false)

private fun runThread(){
        count=0
        newThread = Thread(object : Runnable {
            override fun run(){
                while(shouldRun.get()){
                    ....
                }
            }
        })
        ...
    }
}


btnStop.setOnClickListener {
    shouldRun.set(false)
}

btnStart.setOnClickListener {
    shouldRun.set(true)
    runThread()
}

 

참고로, Thread.sleep은 UI를 블락하기 때문에 모발앱에서는 사용하면 곤란합니다. 

Answer 2

코드상에는 count의 값이 2인 상태에서 0으로 변경되어 그 값이 3이 되지 않아 스레드가 종료되지 않네요.