How to check email Address Validation in Android on edit Text

This example demonstrates how to check email Address Validation in Android on edit Text.
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version = "1.0" encoding = "utf-8"?>
<LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"
   android:id = "@+id/parent"
   xmlns:tools = "http://schemas.android.com/tools"
   android:layout_width = "match_parent"
   android:layout_height = "match_parent"
   tools:context = ".MainActivity"
   android:gravity = "center"
   android:orientation = "vertical">
   <EditText
      android:id = "@+id/emailId"
      android:hint = "Enter Email id"
      android:layout_margin = "20dp"
      android:layout_width = "match_parent"
      android:layout_height = "wrap_content" />
   <Button
      android:id = "@+id/text"
      android:textSize = "18sp"
      android:textAlignment = "center"
      android:layout_width = "wrap_content"
      android:textColor = "#000"
      android:text = "Check validation"
      android:layout_height = "wrap_content" />
</LinearLayout>
In the above code, we have taken edit text and button. When the user clicks on a button, it will check edit text data and validate that data.
Step 3 − Add the following code to src/MainActivity.java
package com.example.andy.myapplication;
import android.content.res.Configuration;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.RequiresApi;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
   int view = R.layout.activity_main;
   Button button;
   EditText emailId;
   String emailPattern = "[a-zA-Z0-9._-]+@[a-z]+\\.+[a-z]+";
   @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(view);
      button = findViewById(R.id.text);
      emailId = findViewById(R.id.emailId);
      button.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            if(emailId.getText().toString().isEmpty()) {
               Toast.makeText(getApplicationContext(),"enter email address",Toast.LENGTH_SHORT).show();
            }else {
               if (emailId.getText().toString().trim().matches(emailPattern)) {
                  Toast.makeText(getApplicationContext(),"valid email address",Toast.LENGTH_SHORT).show();
               } else {
                  Toast.makeText(getApplicationContext(),"Invalid email address", Toast.LENGTH_SHORT).show();
               }
            }
         }
      });
   }
}
In the above code, we are validating edit text data as shown below -
String emailPattern = "[a-zA-Z0-9._-]+@[a-z]+\\.+[a-z]+";

....................................

if(emailId.getText().toString().isEmpty()) {
   Toast.makeText(getApplicationContext(),"enter email address",Toast.LENGTH_SHORT).show();
}else {
   if (emailId.getText().toString().trim().matches(emailPattern)) {
      Toast.makeText(getApplicationContext(),"valid email address",Toast.LENGTH_SHORT).show();
   } else {
      Toast.makeText(getApplicationContext(),"Invalid email address", Toast.LENGTH_SHORT).show();
   }
}
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −
In the above result, we have entered valid email id and clicked a button. It is showing the correct validation message as a valid email address. Now enter wrong email id and click on a button. It will show the message as shown below -
Click here to download the project code