MainActivity.kt
package com.example.jetpack
import android.app.Activity
import android.content.Context.INPUT_METHOD_SERVICE
import android.os.Bundle
import android.view.KeyEvent
import android.view.View
import android.view.inputmethod.InputMethodManager
import androidx.appcompat.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// initialize a new key listener instance
val keyListener = View.OnKeyListener { p0, p1, p2 ->
if(p2.action == KeyEvent.ACTION_DOWN && p1 == KeyEvent.KEYCODE_ENTER){
// perform action on enter key press
textView.text = "Enter Key Pressed \n\n${editText.text}"
// hide soft keyboard programmatically on enter key press
hideSoftKeyboard()
// optionally clear focus and hide cursor from edit text
editText.clearFocus()
editText.isCursorVisible = false
// optional, set focus on root constraint layout
constraintLayout.isFocusable = true
true
}else{
false
}
}
// add key listener for edit text
editText.setOnKeyListener(keyListener)
}
}
// extension function to hide soft keyboard programmatically
fun Activity.hideSoftKeyboard(){
(getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager).apply {
hideSoftInputFromWindow(currentFocus?.windowToken, 0)
}
}
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:id="@+id/constraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#EDEAE0"
tools:context=".MainActivity">
<EditText
android:id="@+id/editText"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:inputType="text"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.12" />
<TextView
android:id="@+id/textView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="12dp"
android:fontFamily="sans-serif-condensed-medium"
android:gravity="center"
android:padding="8dp"
android:textColor="#4F42B5"
android:textSize="25sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/editText"
tools:text="TextView" />
</androidx.constraintlayout.widget.ConstraintLayout>


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