How to hide or show password in kotlin

In this android kotlin source code example, we are going to hide and show password programmatically in kotlin.

You can copy and adopt this source code example to your Kotlin android project without reinventing the wheel.

Below is a step by step source code to hide and show password programmatically in kotlin.

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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".EditText.EditTextActivity3">

    <EditText
        android:id="@+id/edtField"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Password"
        android:inputType="textPassword"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>

    <Button
        android:id="@+id/showpass"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:layout_marginTop="15dp"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:text="Show Password"
        android:onClick="edtPass"
        android:textColor="#ffffff"
        android:textStyle="bold"
        android:textSize="15sp"
        app:layout_constraintTop_toBottomOf="@id/edtField"/>

    <Button
        android:id="@+id/hidepass"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:layout_marginTop="2dp"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:text="Hide Password"
        android:onClick="edtPass"
        android:textColor="#ffffff"
        android:textStyle="bold"
        android:textSize="15sp"
        app:layout_constraintTop_toBottomOf="@id/showpass"/>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.text.method.HideReturnsTransformationMethod
import android.text.method.PasswordTransformationMethod
import android.view.View
import android.widget.EditText
import com.bluapp.kotlinview.R

class EditTextActivity3 : AppCompatActivity() {
    private var edtField : EditText? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_edit_text3)
        edtField = findViewById<EditText>(R.id.edtField) as EditText
    }

    fun edtPass(view: View){
        if(view.id == R.id.showpass){
            edtField?.transformationMethod = HideReturnsTransformationMethod.getInstance()
        }else{
            edtField?.transformationMethod = PasswordTransformationMethod.getInstance()
        }
    }
}

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