Hello Readers! In this post, we are going to learn about android TextInputLayout using kotlin in any android application. We will also learn about different attributes of android TextInputLayout that can be used to customise this widget.

Output

Android TextInputLayout Output

Getting Started

Android TextInputLayout can be defined as below –

TextInputLayout is a layout that wraps EditText (or descendant) to show floating level when the hint is hidden due to user inputting text.

You can also show error message (if any) or character count using TextInputLayout.

TextInputEditText is used as child of this layout. It allows greater control over visual aspects of any text input.

Example of Android TextInputLayout Using Kotlin

At first, we will create android application. Then, we will use TextInputLayout using kotlin in the application. In this example, we will create a basic login screen using textInputLayout and textInputEditText.

1. Creating New Project in Kotlin

Follow steps below to create new project. Please ignore the steps if you have already created the project.

Since we have a project now, we will modify xml and other files to use TextInputLayout using kotlin in the application.

2. Modify values folder

Open res/values/strings.xml file. Then, add below code into it.

<resources>
	<string name="app_name">TextInputLayout</string>
	<string name="username">Enter Username</string>
	<string name="password">Enter Password</string>
	<string name="submit">Submit</string>
</resources>

3. Use TextInputLayout Widget in xml file

Open src/main/res/layout/activity_main.xml file and add below code into it.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:orientation="vertical"
	android:padding="30dp">

	<android.support.design.widget.TextInputLayout
		android:layout_width="match_parent"
		android:layout_height="wrap_content">

		<android.support.design.widget.TextInputEditText
			android:id="@+id/username"
			android:layout_width="match_parent"
			android:layout_height="wrap_content"
			android:hint="@string/username"/>

	</android.support.design.widget.TextInputLayout>

	<android.support.design.widget.TextInputLayout
		android:layout_width="match_parent"
		android:layout_height="wrap_content">

		<android.support.design.widget.TextInputEditText
			android:id="@+id/password"
			android:layout_width="match_parent"
			android:layout_height="wrap_content"
			android:hint="@string/password"
			android:inputType="textPassword"/>

	</android.support.design.widget.TextInputLayout>

	<Button
		android:id="@+id/submit"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_gravity="center"
		android:layout_marginTop="10dp"
		android:paddingLeft="20dp"
		android:paddingRight="20dp"
		android:text="@string/submit"/>

</LinearLayout>

Here, we have defined two textInputLayout with textInputEditText that are used as username and password fields. Then, there is a button that are used to get the texts entered in username and password fields. Now, we will access these fields in kotlin file.

4. Access TextInputLayout Widget in Kotlin file

Open src/main/java/com.tutorialwing.textinputlayout/MainActivity.kt file and add below code into it.

package com.tutorialwing.textinputlayout

import android.os.Bundle
import android.support.design.widget.TextInputEditText
import android.support.v7.app.AppCompatActivity
import android.view.View
import android.widget.Button
import android.widget.Toast

class MainActivity : AppCompatActivity() {

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

        val etUsername = findViewById<TextInputEditText>(R.id.username)
        val etPassword = findViewById<TextInputEditText>(R.id.password)

        val submit = findViewById<Button>(R.id.submit)
        if (submit != null && etPassword != null && etUsername != null) {
            submit.setOnClickListener {
                val username = etUsername.text.toString()
                val password = etPassword.text.toString()

                Toast.makeText(applicationContext,
                        "Username: $username, Password: $password", Toast.LENGTH_SHORT).show()
            }
        }
    }
}

In MainActivity.kt file, we have accessed username and password fields. Then, we have set a click listener on button to get the texts entered in username and password fields. Then, show it as toast message to the user.

Since AndroidManifest.xml file is very important in any android application, we are also going to see the content inside this file.

AndroidManifest.xml file

Code inside main/AndroidManifest.xml file is as below.

<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.tutorialwing.textinputlayout"
		  xmlns:android="http://schemas.android.com/apk/res/android">

	<application
		android:allowBackup="true"
		android:icon="@mipmap/ic_launcher"
		android:label="@string/app_name"
		android:roundIcon="@mipmap/ic_launcher_round"
		android:supportsRtl="true"
		android:theme="@style/AppTheme">
		<activity android:name=".MainActivity">
			<intent-filter>
				<action android:name="android.intent.action.MAIN"/>

				<category android:name="android.intent.category.LAUNCHER"/>
			</intent-filter>
		</activity>
	</application>

</manifest>

When we run the program, we will get output as shown above.

That’s end of our tutorial on Android TextInputLayout using Kotlin.