Android/Kotlin
[Kotlin] runOnUiThread
혀가 길지 않은 개발자
2020. 6. 28. 23:02
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:id="@+id/tvText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="혀가 길지 않은 개발자"
android:textSize="30dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
<Button
android:id="@+id/btnChange"
android:layout_width="180dp"
android:layout_height="80dp"
android:textAllCaps="false"
android:text="Change"
android:textSize="16dp"
android:layout_marginTop="30dp"
app:layout_constraintTop_toBottomOf="@+id/tvText"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
android:textAllCaps="false"
대소문자 구분 (CHANGE -> Change)
MainActivity.kt
package com.jwsoft.kotlinproject
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
btnChange.setOnClickListener {
Thread {
tvText.text = "혀가 긴 개발자"
}.start()
}
}
}
버튼 클릭 후 에러 발생
UI 작업은 메인쓰레드에서만 가능
MainActivity.kt
package com.jwsoft.kotlinproject
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
btnChange.setOnClickListener {
runOnUiThread {
tvText.text = "혀가 긴 개발자"
}
}
}
}