데이터 바인딩

1. 환경설정하기

• 모듈 수준의 gradle에 추가

dataBinding{
    enabled = true
}

 

 

 

2. 레이아웃 설정하기

• 최상위 루트 코드를 layout으로 설정하기

<?xml version="1.0" encoding="utf-8"?>

<layout>
    <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">

        <Button
            android:id="@+id/testBtn"
            android:text="버튼"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
    </androidx.constraintlayout.widget.ConstraintLayout>
</layout>

 

3. 메인 액티비티

class MainActivity : AppCompatActivity() {

    private lateinit var binding : ActivityMainBinding

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

        // 1번 - findViewById이용
        /*val btn = findViewById<Button>(R.id.testBtn)
        btn.setOnClickListener {
            Toast.makeText(this, "클릭됨", Toast.LENGTH_LONG).show()
        }*/

        // 2번 - Databinding이용
        binding = DataBindingUtil.setContentView(this, R.layout.activity_main)

        binding.testBtn.setOnClickListener {
            Toast.makeText(this, "클릭됨", Toast.LENGTH_LONG).show()
        }

    }
}