How to Validate Email in Android Studio

Introduction

In this tutorial you will learn how to validate Email_id in Android Studio. To validate Email_id we must use the regex code (regular expression).

regular expression:-

"^(([\\w-]+\\.)+[\\w-]+|([a-zA-Z]{1}|[\\w-]{2,}))@"

                                +"((([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\\.([0-1]?"

                                +"[0-9]{1,2}|25[0-5]|2[0-4][0-9])\\."

                                +"([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\\.([0-1]?"

                                +"[0-9]{1,2}|25[0-5]|2[0-4][0-9])){1}|"

                                +"([a-zA-Z]+[\\w-]+\\.)+[a-zA-Z]{2,4})$";

Step 1

Create a new project:



Step 2
 

Open your XML file and use an element like this:

 

<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:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    android:paddingBottom="@dimen/activity_vertical_margin"

    tools:context=".MainActivity">

 

      <TextView

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="Email_Id"

            android:id="@+id/textView"

            android:layout_marginLeft="13dp"

            android:layout_marginTop="27dp"

            android:layout_alignParentTop="true"

            android:layout_alignParentLeft="true"/>

     
      <EditText

        android:id="@+id/emailEditText"

        android:layout_width="250dp"

        android:layout_height="wrap_content"

        android:ems="10"

        android:layout_alignTop="@+id/textView"

        android:layout_alignParentRight="true"

      />

  

     <Button

        android:id="@+id/sendButton"

        android:layout_height="wrap_content"

        android:layout_width="wrap_content"

        android:text="SEND"

        android:layout_marginTop="38dp" android:layout_below="@+id/emailEditText"

        android:layout_centerHorizontal="true"/>

   
     <TextView

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

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

            android:text=""

            android:id="@+id/textViewmessage"

            android:layout_marginTop="32dp"

            android:layout_below="@+id/sendButton"

            android:layout_centerHorizontal="true"/>

 

 </RelativeLayout>

Step 3

Open the Java file and write this:
 

package com.emailvalidation;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

 

public class MainActivity extends Activity {

Button emailButton;

EditText emailEdittext;

TextView textviewMessage;

 

        @Override

        protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        emailButton=(Button)findViewById(R.id.sendButton);

        emailEdittext=(EditText)findViewById(R.id.emailEditText);

        textviewMessage=(TextView)findViewById(R.id.textViewmessage);

 

        emailButton.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View view) {

                String getText=emailEdittext.getText().toString();

                String Expn =

                        "^(([\\w-]+\\.)+[\\w-]+|([a-zA-Z]{1}|[\\w-]{2,}))@"

                                +"((([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\\.([0-1]?"

                                +"[0-9]{1,2}|25[0-5]|2[0-4][0-9])\\."

                                +"([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\\.([0-1]?"

                                +"[0-9]{1,2}|25[0-5]|2[0-4][0-9])){1}|"

                                +"([a-zA-Z]+[\\w-]+\\.)+[a-zA-Z]{2,4})$";

 

                        if (getText.matches(Expn) && getText.length() > 0)

                        {

                            textviewMessage.setText("valid email");

                        }

                        else

                        {

                            textviewMessage.setText("invalid email");

                        }

                    }

            public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

            public void onTextChanged(CharSequence s, int start, int before, int count) {}

                });

            }

Step 4
 

See the output.

When we enter an invalid Email_id:

Step 5

When we enter a valid Email_id: