[Android] 뷰의 크기 (width, height) 구하기, 동적으로 크기 설정하기

목표:

LinearLayout의 크기를 TextView의 크기와 같게 만들기

 

 

layout/activity_main.xml

<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/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="100dp"
        android:text="Hello World!"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    
    <LinearLayout
        android:id="@+id/dynamicView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="30dp"
        android:background="@color/colorAccent"
        android:orientation="horizontal"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

</androidx.constraintlayout.widget.ConstraintLayout>

 

 

MainActivity.kt

class MainActivity : AppCompatActivity() {
    private lateinit var binding: ActivityMainBinding // 뷰 바인딩

    private var tvWidth = 0
    private var tvHeight = 0

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)


        binding.textView.viewTreeObserver.addOnGlobalLayoutListener(object : ViewTreeObserver.OnGlobalLayoutListener {
            override fun onGlobalLayout() {
                tvWidth = binding.textView.width // 텍스트뷰 width
                tvHeight = binding.textView.height // 텍스트뷰 height

                // LinearLayout에 width, height 적용하기
                val params = binding.dynamicView.layoutParams
                params.apply {
                    width = tvWidth
                    height = tvHeight
                }
                binding.dynamicView.apply {
                    layoutParams = params
                }

                // 다 쓰고 리스너 삭제
                binding.textView.viewTreeObserver.removeOnGlobalLayoutListener(this)
            }
        })
    }
}

 

 

 

결과