Login with Validation (Android Example)

Now here we move to the next step which is very important when we deal with the Login page in android app Development. Many of the time, we just forget to apply the validations on the EditText provided for username and password. This is the problem with fresher. In this tutorial, we will learn that how to apply validation to the username and password field to make a Login page with validation so that user must have to fill all the required fields. Just follow these steps:

Make two layout files inside res/layouts folder. One for Login UI and other for Redirecting user after entering the username, password and pressing login button. Use the following code in Activity_main.xml file which is your login UI.

Activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context=".MainActivity" >

<EditText

android:id="@+id/edtuser"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_alignParentTop="true"

android:layout_centerHorizontal="true"

android:ems="10"

android:hint="Enter username"

android:inputType="text" />

<EditText

android:id="@+id/edtpass"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_below="@+id/edtuser"

android:layout_centerHorizontal="true"

android:layout_marginTop="44dp"

android:ems="10"

android:hint="Enter password"

android:inputType="textPassword" >

</EditText>

<Button

android:id="@+id/btnLogin"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_below="@+id/edtpass"

android:layout_centerHorizontal="true"

android:layout_marginTop="43dp"

android:text="Login" />

</RelativeLayout>

2. Now your Login UI is ready. Now you have to make another file for redirecting user after login. I named it after_login.xml. You can use any other name which you feel suitable for you. Copy the following code into your after_login.xml file.

after_login.xml

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" >

<TextView

android:id="@+id/textView1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Welcome to the after login page."

android:textAppearance="?android:attr/textAppearanceLarge" />

</LinearLayout>

3. Your UI for both the files is ready. Now you have to work on the coding part which is always in java when we deals with android development. Follow these steps for mainActivity.java file.

· Add the following code after “extends activity {”

EditText edtuser,edtpass;

Button btnLogin;

· Add the following code to initialize the controls inside onCreate() method.

edtuser=(EditText)findViewById(R.id.edtuser);

edtpass=(EditText)findViewById(R.id.edtpass);

btnLogin=(Button)findViewById(R.id.btnLogin);

· Now apply onclick listener to the button by copying the following code.

btnLogin.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

if(edtuser.getText().toString().trim().length()==0){

edtuser.setError("Username is not entered");

edtuser.requestFocus();

}

if(edtpass.getText().toString().trim().length()==0){

edtpass.setError("Password is not entered");

edtpass.requestFocus();

}

else{

Intent it=new Intent(getApplicationContext(), afterLogin.class);

startActivity(it);

}

});

Your final mainActivity.class file will contain the following code:

package com.at4u.loginwithvalidation;

import android.os.Bundle;

import android.app.Activity;

import android.content.Intent;

import android.view.Menu;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

public class MainActivity extends Activity {

EditText edtuser,edtpass;

Button btnLogin;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

edtuser=(EditText)findViewById(R.id.edtuser);

edtpass=(EditText)findViewById(R.id.edtpass);

btnLogin=(Button)findViewById(R.id.btnLogin);

btnLogin.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

if(edtuser.getText().toString().trim().length()==0){

edtuser.setError("Username is not entered");

edtuser.requestFocus();

}

if(edtpass.getText().toString().trim().length()==0){

edtpass.setError("Password is not entered");

edtpass.requestFocus();

}

else{

Intent it=new Intent(getApplicationContext(), afterLogin.class);

startActivity(it);

}

});

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

4. Now add the activity in the manifest.xml file by copying the following code:

Download the full code.

30 Responses to “Login with Validation (Android Example)”

lokesh said... 5 April 2017 at 01:16 thanks dude.... i thought it was very difficult to write validation code u made it simple probably all using it...
Unknown said... 26 April 2017 at 03:53 This is step by step . Very helpful it's like weight to beginner , you fill all space bro
Unknown said... 16 February 2018 at 23:10 means that if we put any input , it will redirect to another page , am I right ?
AngelVila said... 6 June 2019 at 11:26 Thanks a lot. How can I validate having the información in a PC DataBase?
Unknown said... 20 June 2019 at 04:51 how we create a Valid user name and psword using intent button
qb enterprise support number said... 26 January 2020 at 22:36 The experts at QuickBooks Technical Support Phone Number +1 (877) 282-6222 are available 24x7 hours and are always ready to help you with the best solution, every time. The experts at QuickBooks Technical Support Phone Number +1 (877) 282-6222 are available 24x7 hours and are always ready to help you with the best solution, every time. QuickBooks Technical Support Phone Number QuickBooks Technical Support Phone Number QuickBooks Technical Support Phone Number
Quickbooks Phone Number said... 10 June 2020 at 22:43 Very well explained blog click here for QuickBooks Proadvisor Support Phone Number for more details dial on our 24*7 QuickBooks Enterprise support phone number 1-855-615-2111
The Qb Payroll said... 3 July 2020 at 22:46 QuickBooks POS Support Phone Number QuickBooks Desktop Support Phone Number QuickBooks Desktop Support Phone Number QuickBooks For Mac Support Phone Number QuickBooks Pro Support Phone Number QuickBooks Enterprise Support Phone Number QuickBooks Tech Support phone Number QuickBooks Payroll Support Phone Number QuickBooks For Mac Support Phone Number QuickBooks Toll Free Phone Number
Quickbooks Phone Number said... 6 July 2020 at 22:22 Very helpful and i would like to thanks!Do you want QuickBooks Payroll Support Number Get live support 24*7 from QuickBooks expert on tool-free Number.Click here to know how to Grab QuickBooks trial for desktop Dial for any tech support:1-855-511-6911
Quickbooks Phone Number said... 6 July 2020 at 22:51 Very well explained blog click here for QuickBooks Proadvisor Support Phone Number for more details dial on our 24*7 and Dial 1-855-511-6911 QuickBooks Enterprise support Number
Anonymous said... 11 August 2020 at 18:53 This comment has been removed by the author.
Anonymous said... 11 August 2020 at 18:57 Thanx a lot
yamini said... 24 January 2022 at 03:53 This comment has been removed by the author.
yamini said... 24 January 2022 at 04:00 This is really helpful and informative. Nice, Best data analytics institute in Lucknow
Erkam said... 28 September 2023 at 03:30 https://bayanlarsitesi.com/ Altınşehir Karaköy Alemdağ Gürpınar KWOAWC
Ergün74 said... 3 October 2023 at 18:03 elazığ bilecik kilis sakarya yozgat FUCY
StardustGoddessXYOLG1 said... 21 October 2023 at 11:41 Mersin Lojistik Amasya Lojistik Kayseri Lojistik Kırklareli Lojistik Erzurum Lojistik HLU
87A19MichaelA9904 said... 11 November 2023 at 07:58 9B158 Satoshi Coin Hangi Borsada Hatay Şehirler Arası Nakliyat Eskişehir Lojistik Nevşehir Parça Eşya Taşıma Malatya Parça Eşya Taşıma Tekirdağ Cam Balkon Silivri Çatı Ustası Niğde Şehirler Arası Nakliyat Bolu Şehir İçi Nakliyat
64149DonaldBF32E said... 14 November 2023 at 19:27 CF81F Binance Referans Kodu Çanakkale Evden Eve Nakliyat Denizli Evden Eve Nakliyat Samsun Evden Eve Nakliyat Balıkesir Evden Eve Nakliyat buy masteron order masteron Manisa Evden Eve Nakliyat Mardin Evden Eve Nakliyat
E56FBEmersonE8EFB said... 18 November 2023 at 13:06 7AF94 Gümüşhane Lojistik Kütahya Parça Eşya Taşıma Tunceli Şehirler Arası Nakliyat Milyon Coin Hangi Borsada Hatay Şehir İçi Nakliyat Siirt Evden Eve Nakliyat Ünye Kurtarıcı İstanbul Evden Eve Nakliyat Kilis Şehirler Arası Nakliyat
8393AMerrick6B3C9 said... 20 December 2023 at 06:02 CE8A3 canli sohbet chat parasız görüntülü sohbet uygulamaları bilecik parasız sohbet siteleri kayseri ucretsiz sohbet van ücretsiz sohbet kadınlarla sohbet et bingöl sohbet muhabbet sivas kadınlarla sohbet et muğla görüntülü sohbet ücretsiz
F0C41ChelseaB0350 said... 24 December 2023 at 03:33 46057 sesli sohbet odası Tokat Rastgele Canlı Sohbet kastamonu parasız görüntülü sohbet görüntülü sohbet ücretsiz kadınlarla rastgele sohbet adıyaman canli sohbet bedava çankırı telefonda kadınlarla sohbet agri sesli sohbet odası sesli sohbet sitesi
44784Ronald53D05 said... 25 December 2023 at 19:03 427ED bedava sohbet amasya canlı sohbet adıyaman ücretsiz sohbet uygulaması uşak rastgele sohbet adıyaman görüntülü sohbet uygulama Bayburt Canlı Sohbet Siteleri Ücretsiz Bitlis Rastgele Sohbet Uygulaması adana yabancı canlı sohbet kocaeli en iyi rastgele görüntülü sohbet
CED46Jimmie7DE24 said... 2 January 2024 at 02:45 2643C bedava sohbet chat odaları yozgat ücretsiz görüntülü sohbet tokat kızlarla rastgele sohbet rastgele sohbet canli sohbet chat Antep Ücretsiz Sohbet Odaları kütahya sesli sohbet siteleri karabük canlı sohbet et Adıyaman Ücretsiz Sohbet Sitesi
98BCDGlenn51D56 said... 5 January 2024 at 02:04 B3B95 rize ücretsiz sohbet sitesi niğde ücretsiz görüntülü sohbet Düzce Bedava Görüntülü Sohbet konya kadınlarla rastgele sohbet kars ucretsiz sohbet kırklareli sohbet odaları şırnak mobil sohbet chat maraş canlı sohbet odası düzce görüntülü sohbet uygulama
A564CShay02309 said... 6 January 2024 at 07:30 1452F Coin Nedir Görüntülü Sohbet Parasız Görüntülü Sohbet Yeni Çıkacak Coin Nasıl Alınır Tumblr Takipçi Hilesi Vector Coin Hangi Borsada Clubhouse Takipçi Hilesi Meta Coin Hangi Borsada Bitcoin Nasıl Üretilir
BE8DDTraci8E41E said... 9 January 2024 at 22:19 66E47 Bitcoin Nasıl Çıkarılır Binance Hangi Ülkenin Bitcoin Nasıl Para Kazanılır Binance Borsası Güvenilir mi Kripto Para Nasıl Çıkarılır Likee App Takipçi Satın Al Kripto Para Madenciliği Nasıl Yapılır Binance Referans Kodu Binance Referans Kodu
6C647Valerie6948F said... 18 January 2024 at 11:51 B94BF Coin Çıkarma Siteleri Kaspa Coin Hangi Borsada Caw Coin Hangi Borsada Binance Para Kazanma Referans Kimliği Nedir Vector Coin Hangi Borsada Arbitrum Coin Hangi Borsada Pinterest Takipçi Hilesi Binance Referans Kodu
9FFE7William2CD8C said... 20 January 2024 at 02:38 03734 Binance Referans Kodu Twitter Trend Topic Hilesi Binance Nasıl Oynanır Soundcloud Takipçi Satın Al Gate io Borsası Güvenilir mi Bitcoin Para Kazanma Sohbet Osmo Coin Hangi Borsada Binance Referans Kodu
A20F4D8F9AReed8F5E69F9AE said... 7 December 2024 at 07:14 6D4084FCC0 tiktok beğeni

Android Tutorials

Trending: Android Tutorials

Translate To Your Own Langauge

Login with Validation (Android Example)

This post was written by: Deepak Anand

30 Responses to “Login with Validation (Android Example)”

Post a Comment

You may be interested in:

Tags

Labels

Google Map V2

Is this Blog beneficial?

Chat

Visitors

About Me

Contact Us