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

How to Use DatePicker Control

Main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

    <Button

        android:id="@+id/changeDate"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Click To Change Date" />

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Current/Selected Date (M-D-YYYY): "

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

  

  

    <EditText

        android:id="@+id/editText1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:ems="10" >

        <requestFocus />

    </EditText>

</LinearLayout>

Activity_main.java

package com.chirag.datepicker;

import com.android.datepicker.R;

import java.util.Calendar;

import android.app.Activity;

import android.app.DatePickerDialog;

import android.app.Dialog;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.DatePicker;

import android.widget.EditText;

public class DatePickerExample extends Activity {

private Button changeDate;

public EditText ed;

private int year;

private int month;

private int day;

static final int DATE_PICKER_ID = 709; 

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

changeDate = (Button) findViewById(R.id.changeDate);

ed=(EditText)findViewById(R.id.editText1);

// Get current date by calender

final Calendar c = Calendar.getInstance();

year  = c.get(Calendar.YEAR);

month = c.get(Calendar.MONTH);

day   = c.get(Calendar.DAY_OF_MONTH);

// Show current date

ed.setText(new StringBuilder()

// Month is 0 based, just add 1

.append(month + 1).append("-").append(day).append("-")

.append(year).append(" "));

 

// Button listener to show date picker dialog

changeDate.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

                

// On button click show datepicker dialog 

showDialog(DATE_PICKER_ID);

}

});

ed.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

showDialog(DATE_PICKER_ID);

}

});

   }

@Override

protected Dialog onCreateDialog(int id) 

{

switch (id) 

{

case DATE_PICKER_ID:

// open datepicker dialog. 

// set date picker for current date 

// add pickerListener listner to date picker

return new DatePickerDialog(this, pickerListener, year, month,day);

}

return null;

}

private DatePickerDialog.OnDateSetListener pickerListener = new DatePickerDialog.OnDateSetListener() 

{

// when dialog box is closed, below method will be called.

@Override

public void onDateSet(DatePicker view, int selectedYear,

int selectedMonth, int selectedDay) {

year  = selectedYear;

month = selectedMonth;

day   = selectedDay;

// Show selected date 

ed.setText(new StringBuilder().append(month + 1)

.append("-").append(day).append("-").append(year)

.append(" "));

  }

   };

}

Screen Short:-