UI validations in Android


Live Demo

Follow the below steps to do UI validations in Android. In this tutorial i will show how to do Input validation. Please download the code and run in in your system.

Step 1

Make a blank android project. If you do not know how to make blank android project, please see my previous post.

Step 2

Do the design like below.


Step 3

Write a validation class.

package javaant.com.android_ui_validation.util;

import android.text.TextUtils;
import android.widget.EditText;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

 * Created by nirmal on 29/07/15.
public class ValidationUtil {
    public static boolean emptyCheck(EditText editText,String message){
            return false;
        return true;

    public static boolean emailValidator(EditText editText)
        Pattern pattern;
        Matcher matcher;
        final 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.compile(EMAIL_PATTERN);
        matcher = pattern.matcher(editText.getText());
            editText.setError("Email Id not valid");
            return false;
        return true;

Note – This validation class can be reused for other activity.

Step 4

Use the validation class on button click.

package javaant.com.android_ui_validation;
import android.app.Activity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

import javaant.com.android_ui_validation.util.ValidationUtil;

public class MainActivity extends Activity implements  View.OnClickListener {
    EditText txtName;
    EditText txtEmail;
    EditText txtPassword;

    protected void onCreate(Bundle savedInstanceState) {
        txtName= (EditText) findViewById(R.id.txtName);
        txtEmail= (EditText) findViewById(R.id.txtEmail);
        txtPassword= (EditText) findViewById(R.id.txtPassword);

public void onClick(View v){

        boolean flag= ValidationUtil.emptyCheck(txtName, "Name Can not be blank");
        boolean flag2=ValidationUtil.emptyCheck(txtEmail, "Email Id Can not be blank");
        boolean flag3=ValidationUtil.emptyCheck(txtPassword, "Password  Can not be blank");
        boolean flag4=ValidationUtil.emailValidator(txtEmail);

Now run the project and click on “Save” button.


download Code

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About Nirmal Dhara 28 Articles
Java Developer

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