Android Programming Tutorial 36 : Toast Validations In Android:

OutPut Of the Tutorial:

Create Android Application:

• File >> New >> Android Application
• Enter Project name: ToastValidationApp
• Package: com.ambilpursunil.newapp
• Keep other default selections, click Next until you reach Finish

                               

 1.Simply Copy and Past the Code which is display below in the  MainActivity.java 

package com.ambilpursunil.newapp;

import java.util.regex.Pattern;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

public class MainActivity extends Activity {

           

 private static final Pattern EMAIL_PATTERN = Pattern.compile("[a-zA-Z0-9+._%-+]    {1,100}" + "@" + "[a-zA-Z0-9][a-zA-Z0-9-]{0,10}" + "(" + "."+ "[a-zA-Z0-9][a-zA-Z0-9-]{0,20}"+")+");

 private static final Pattern USER_PATTERN = Pattern.compile("[a-zA-Z0-9]{1,250}");

 private static final Pattern PASSWORD_PATTERN = Pattern.compile("[a-zA-Z0-9+_.]{4,16}");

           

            private EditText etUser;

            private EditText etPass;

            private EditText etEmail;

            private Button btnValid3;

            @Override

            protected void onCreate(Bundle savedInstanceState) {

                        super.onCreate(savedInstanceState);

                        setContentView(R.layout.activity_main);

                       

                        etUser = (EditText) findViewById(R.id.etUser3);

                        etPass = (EditText) findViewById(R.id.etPass3);

                        etEmail = (EditText) findViewById(R.id.etEmail3);

                       

                        btnValid3 = (Button) findViewById(R.id.btnValid3);

                       

                        btnValid3.setOnClickListener(new View.OnClickListener() {

                                   

                        @Override

                        public void onClick(View v) {

                        String user = etUser.getText().toString();

                        String pass = etPass.getText().toString();

                        String email = etEmail.getText().toString();

if(user.equals("") || pass.equals("") || email.equals("")){

                         if(user.equals("")){

                                                                        Toast.makeText(MainActivity.this,"ENTER USER NAME",                                                                        Toast.LENGTH_SHORT).show();

                         }if(pass.equals("")){

                                                                        Toast.makeText(MainActivity.this,"ENTER PASSWORD NAME",                                                              Toast.LENGTH_SHORT).show();

                         }if(email.equals("")){

                                                                        Toast.makeText(MainActivity.this,"ENTER EMAIL ADDRESS",                                                                Toast.LENGTH_SHORT).show();

                         }

                         }

                         if(!CheckUsername(user)){

                                                                        Toast.makeText(MainActivity.this,"ENTER VALID USERNAME",                                                              Toast.LENGTH_SHORT).show();

                         }if(!CheckPassword(pass)){

                                                                      Toast.makeText(MainActivity.this,"ENTER VALID PASSWORD",                                                              Toast.LENGTH_SHORT).show();

                         }if(!CheckEmail(email)){

                                                                        Toast.makeText(MainActivity.this,"ENTER VALID EMAIL ID",                                                                Toast.LENGTH_SHORT).show();

                         }else{
Toast.makeText(MainActivity.this, "Success...!", Toast.LENGTH_SHORT).show();
                           }

                         }

private boolean CheckEmail(String email) {

                        return EMAIL_PATTERN.matcher(email).matches();

                        }

private boolean CheckPassword(String pass) {

return PASSWORD_PATTERN.matcher(pass).matches();

                         }

private boolean CheckUsername(String user) {

return USER_PATTERN.matcher(user).matches();

                         }

                        });

                  }

            }

2.Simple Copy and Past the below code:  actvitiy_main.xml

<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:orientation="vertical" >

    <EditText

        android:id="@+id/etUser3"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignBaseline="@+id/textView1"

        android:layout_alignBottom="@+id/textView1"

        android:layout_alignParentRight="true"

        android:inputType="textCapSentences|textAutoCorrect"

        android:ems="10" />

    <TextView

        android:id="@+id/textView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true"

        android:layout_marginTop="47dp"

        android:text="UserName:"

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

    <EditText

        android:id="@+id/etPass3"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignBaseline="@+id/textView2"

        android:layout_alignBottom="@+id/textView2"

        android:layout_alignParentRight="true"

        android:inputType="textPassword"

        android:ems="10" />

    <TextView

        android:id="@+id/textView3"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_below="@+id/etPass3"

        android:layout_marginTop="28dp"

        android:text="Email:"

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

    <EditText

        android:id="@+id/etEmail3"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignBaseline="@+id/textView3"

        android:layout_alignBottom="@+id/textView3"

        android:layout_alignParentRight="true"

        android:inputType="textEmailAddress"

        android:ems="10" />

    <TextView

        android:id="@+id/textView2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_below="@+id/etUser3"

        android:layout_marginTop="26dp"

        android:text="PassWord"

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

    <TextView

        android:id="@+id/textView4"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_above="@+id/etUser3"

        android:layout_toRightOf="@+id/textView1"

        android:text="Registeration"

        android:textSize="20dp"

        android:textColor="#176CEC"

        android:textStyle="bold" />

    <Button

        android:id="@+id/btnValid3"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:layout_alignParentBottom="true"

        android:layout_alignParentLeft="true"

        android:layout_marginBottom="106dp"

        android:background="#176CEC"

        android:text="Submit" />

</RelativeLayout>

3.Copy and past the code for manifest.xml

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

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

    package="com.ambilpursunil.newapp"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="21" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".MainActivity"

            android:label="@string/app_name" >

        <intent-filter>

            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

4.Right click on the project and Run As-->Android Application

OutPut Of the Tutorial:

OutPut:

When our application launch, without enter data in the fields if you click on  submit button the 3 toast messages will fired.

Please Send Your Comments To ambilpura.sunil@gmail.com

Stay Tune For Next Tutorial... Validations Using AlertDialogBox In Android: