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: