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.

29 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
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Login with Validation (Android Example)

This post was written by: Deepak Anand

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