EditText 키보드 엔터 키보드 내리기 In Kotlin

실행화면

EditText에 텍스트를 입력하고 키보드 엔터를 눌렀을 때 줄바뀜이 아닌 키보드가 내려가도록 한다. 추가적으로 응용할 때, 특정 기능이 동작할 수 있게 하기 위해서 Toast Message를 추가했다.

프로젝트 구조

참고). ViewBinding 을 사용한다.

Code

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">

    <EditText
        android:id="@+id/edit_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Hello World!"
        android:singleLine="true"
        android:imeOptions="actionGo"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

class MainActivity : AppCompatActivity() {
    lateinit var binding: ActivityMainBinding

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

        setListenerToEditText()
    }

    private fun setListenerToEditText() {
        binding.editText.setOnKeyListener { view, keyCode, event ->
            // Enter Key Action
            if (event.action == KeyEvent.ACTION_DOWN
                && keyCode == KeyEvent.KEYCODE_ENTER
            ) {
                // 키패드 내리기
                val imm = getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager
                imm.hideSoftInputFromWindow(binding.editText.windowToken, 0)
                // Toast Message
                showToastMessage(binding.editText.text.toString())
                true
            }

            false
        }
    }

    private fun showToastMessage(msg: String?) {
        Toast.makeText(this, msg, Toast.LENGTH_SHORT).show()
    }
}

build.gradle(:app)

ViewBinding 사용을 위해 android { } 속성으로 viewBinding{ enabled = true } 를 추가한다.

plugins {
    id 'com.android.application'
    id 'kotlin-android'
}

android {
    compileSdk 31

    defaultConfig {
        applicationId "com.example.enterkeyexample"
        minSdk 26
        targetSdk 31
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }

    viewBinding{
        enabled = true
    }
}

dependencies {

    implementation 'androidx.core:core-ktx:1.7.0'
    implementation 'androidx.appcompat:appcompat:1.4.1'
    implementation 'com.google.android.material:material:1.5.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}