How To Create Email Validation....

Create login application where you will have to validate EmailID (UserName). Till the username and password is not validated , login button should remain disabled.

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Note:- First Create New Android Application(Project) And After Followed Following Step's

Step:- 1

XML: Go To Activity_main.xml File And  Add Following Code....

<LinearLayout 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:background="#F0F0F0"
    android:orientation="vertical" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:text="               Login Form"
        android:textAllCaps="true"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:textColor="#176CEC"
        android:textStyle="bold" />

    <EditText
        android:id="@+id/editText_email"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#fff"
        android:ems="10"
        android:hint="Enter Email Id"
        android:inputType="textEmailAddress"
        android:padding="12dp" />

    <Button
        android:id="@+id/btn_signup"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:background="#176CEC"
        android:text="Check Valid Email"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:textColor="#fff"
        android:textStyle="bold" />

</LinearLayout>

Step:- 2

JAVA:- Go To Activity_main.java File And Write Following Code....

package com.chirag.emailvalidation;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

import android.view.Menu;

public class MainActivity extends Activity {

EditText emailEditText;

Button btn_click;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

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

btn_click=(Button)findViewById(R.id.btn_signup);

btn_click.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View arg0) {

final String email = emailEditText.getText().toString();

if (!isValidEmail(email))

{

emailEditText.setError("Invalid Email");

Toast.makeText(getApplicationContext(),

"Invalid Email", Toast.LENGTH_LONG).show();

btn_click.setEnabled(true);

}

else

{

//emailEditText.setError("Valid Email");

Toast.makeText(getApplicationContext(),

"Valid Email", Toast.LENGTH_LONG).show();

btn_click.setEnabled(false);

}

}

});

}

// validating email id

private boolean isValidEmail(String email) {

String EMAIL_PATTERN = "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@"

+ "[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";

Pattern pattern = Pattern.compile(EMAIL_PATTERN);

Matcher matcher = pattern.matcher(email);

return matcher.matches();

}

@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;

}

}

Step:- 3

Now Run Your Android Application(Project) and Check Your Email Is Validate Or Not.......

OUTPUT:- Screen Short