버튼(Button) 클릭시 alert dialog띄우기

 

1. app - src - main - res - values - strings.xml

<resources>
    <string name="app_name">sample10</string>
    <string name="edit_hint">이름 입력</string>
</resources>

 

2. activity_main.xml

<androidx.constraintlayout.widget.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">
    <EditText
            android:layout_width="377dp"
            android:layout_height="85dp"
            android:inputType="text"
            android:hint="@string/edit_hint"
            android:ems="10"
            android:id="@+id/editText"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"/>
    <Button
            android:text="Button"
            android:layout_width="377dp"
            android:layout_height="74dp"
            android:id="@+id/button"
            app:layout_constraintTop_toBottomOf="@+id/editText"
            android:layout_marginTop="20dp"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.502"/>

</androidx.constraintlayout.widget.ConstraintLayout>

1에 설정한 EditText태그 내 android:hint값을 지정하면

android:hint="@string/edit_hint"

placeholder의 기능을 한다.

 

3. MainActivity.kt

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

    val button = findViewById<Button>(R.id.button)
    val edit = findViewById<EditText>(R.id.editText)

    button.setOnClickListener {

        AlertDialog.Builder(this@MainActivity)
            .setTitle("대화상자 제목")
            .setMessage(edit.text)
            .setCancelable(false)
            .setNeutralButton("닫기", DialogInterface.OnClickListener{_,_ ->
            }).show()
        }
    }
}

버튼 클릭시 다이얼로그가 나온다.