EditText , Button & TextView

Now let’s see some basic widgets of Android :

First, Create a new project with any name you wish to name it. In this tutorial, I am naming my project as Project_Text and named the Activity as MainActivity.kt (you don’t have put the extention “.kt”).

Creating the widgets are as same is in android studio using java.

Your MainActivity should look like this :

MainActivity.kt

package com.a4akhilsudha.project_text
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.EditText
import android.widget.TextView

class MainActivity : AppCompatActivity() {

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

        //        Find the ids of EditText, TextView & Button

        val editText = findViewById(R.id.editText) as EditText

        val button = findViewById(R.id.button) as Button

        val textView = findViewById(R.id.textView) as TextView

        //        Set on click listener to button in order to get the text in textView entered in the EditText.

        button.setOnClickListener { textView.text = editText.text.toString() }
    }
}

and your activity_main.xml should look like this :

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="com.a4akhilsudha.project_text.MainActivity">

    <EditText
        android:id="@+id/editText"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:hint="Enter the text here"
        app:layout_constraintEnd_toEndOf="parent"
        android:layout_marginEnd="8dp"
        app:layout_constraintStart_toStartOf="parent"
        android:layout_marginStart="8dp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="44dp"
        app:layout_constraintHorizontal_bias="0.0" />
    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toBottomOf="@+id/editText"
        app:layout_constraintStart_toStartOf="parent"
        android:layout_marginStart="8dp"
        app:layout_constraintEnd_toEndOf="parent"
        android:layout_marginEnd="8dp"
        android:layout_marginTop="24dp"
        android:text="Show Text"/>
    <TextView
        android:id="@+id/textView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toEndOf="parent"
        android:hint="sample text"
        android:gravity="center"
        android:layout_marginEnd="8dp"
        app:layout_constraintStart_toStartOf="parent"
        android:layout_marginStart="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        android:layout_marginBottom="8dp"
        android:layout_marginTop="8dp"
        app:layout_constraintTop_toBottomOf="@+id/button"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintVertical_bias="0.282" />

</android.support.constraint.ConstraintLayout>

Now run the above code on a device.

Screenshot of the output