4th Development Practice

Thread

    //예제 1
    class MainActivity : AppCompatActivity() {

        var milk = 0

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

            Thread() {
                for (i in 0 until 1001) {
                    println(i)
                }
            }

            Thread() {
                for (i in 1000 downTo 0) {
                    println(i)
                }
            }
        }
    }

    //예제 2
    class MainActivity : AppCompatActivity() {

        var milk = 0

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

            Thread() {
                while(true) {
                    milk++
                }
            }.start()

            Thread() {
                while(true) {
                    milk--

                    if (milk < 0)
                        println("배고파")
                }
            }.start()
        }
    }

    //예제 3
    class MainActivity : AppCompatActivity() {

        private lateinit var binding : ActivityMainBinding

        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)

            binding = ActivityMainBinding.inflate(layoutInflater)
            val view = binding.root
            setContentView(view)

            var pictureChangeArrayList = ArrayList<Int>()

            pictureChangeArrayList.add(R.drawable.cat1)
            pictureChangeArrayList.add(R.drawable.cat2)
            pictureChangeArrayList.add(R.drawable.cat3)
            pictureChangeArrayList.add(R.drawable.cat4)

            Thread() {
                for (i in pictureChangeArrayList) {  //for-each문
                    Thread.sleep(1000)
                    binding.imgMain.setImageResource(i)
                }
            }.start()
        }
    }

    var handler = Handler(Looper.getMainLooper())

    Thread() {
        for (i in pictureArrayList) {  //for-each문
            Thread.sleep(1000)

            handler.post {
                binding.imgMain.setImageResource(i)
            }
        }
    }.start()