Android Programming Tutorial 37 : Validations Using AlertDialogBox In Android

Create Android Application:

• File >> New >> Android Application
• Enter Project name: AlertDialogBoxValidationApp
• 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 android.app.Activity;

import android.app.AlertDialog;

import android.content.DialogInterface;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

public class MainActivity extends Activity implements OnClickListener {

            Button login, clear;

            EditText uN, pW;

            AlertDialog aDialog;

            @Override

            protected void onCreate(Bundle savedInstanceState) {

                        super.onCreate(savedInstanceState);

                        setContentView(R.layout.activity_main);

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

                        aDialog = new AlertDialog.Builder(this).create();

                        aDialog.setTitle("Error Message");

                        login.setOnClickListener(this);

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

                        clear.setOnClickListener(this);

                       }

            @SuppressWarnings("deprecation")

            @Override

            public void onClick(View v) {

                        if (v == this.login) {

                        uN = (EditText) findViewById(R.id.unm);

                        pW = (EditText) findViewById(R.id.pwd);

                        String userN = uN.getText().toString();

                        String passW = pW.getText().toString();

 if (userN.equals("") || passW.equals("")) {

                        aDialog.setMessage("Enter UserName & Password");

aDialog.setButton("OK", new DialogInterface.OnClickListener() {

             @Override

public void onClick(DialogInterface dialog, int which) {

                        return;

                        }

                        });

                        }

if (userN.equals("sunil") && passW.equals("android")) {

                      aDialog.setMessage("Success...!");

 // Intent i = new Intent(Demo.this, MenuControl.class);

                      // startActivity(i);

                       } else 

if (userN.equals("sunil") && passW.equals("")) {

                       aDialog.setMessage("Enter Password");

                       } else {

                       if (userN.equals("") && passW.equals("android")) {

                       aDialog.setMessage("Enter UserName");

                       }

                      else {

                      aDialog.setMessage("Enter UserName & Password");

                      }

                      }

                      }

aDialog.setButton("OK", new DialogInterface.OnClickListener() {

                 @Override

 public void onClick(DialogInterface dialog, int which) {

                     return;

                    }

                    });

                    }

                    aDialog.show();

                   }

 }

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

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

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

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:background="#ffffff"

    >

    <ImageView

    android:id="@+id/main_logo"

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

    android:background="@drawable/ic_launcher"

   android:layout_marginLeft="-5dip"

    android:layout_marginRight="-5dip"

    android:layout_marginTop="-10dip"

    />

    <TextView

    android:id="@+id/tunm"

    android:layout_width="wrap_content"

    android:layout_height="fill_parent"

    android:layout_marginLeft="10dip"

     android:layout_marginTop="75dip"

    android:text="User Name :"

    android:textColor="#aa00aa"

    />

    <EditText

    android:id="@+id/unm"

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

    android:layout_marginLeft="100dip"

    android:layout_marginRight="5dip"

    android:layout_marginTop="65dip"

    />

    <TextView

    android:id="@+id/tpwd"

    android:layout_width="wrap_content"

    android:layout_height="fill_parent"

    android:layout_marginLeft="10dip"

    android:layout_marginTop="125dip"

    android:text=" Password :"

    android:textColor="#aa00aa"

    />

    <EditText

    android:id="@+id/pwd"

    android:layout_width="fill_parent"

    android:layout_height="wrap_content"

    android:layout_marginLeft="100dip"

    android:layout_marginRight="5dip"

    android:layout_marginTop="120dip"

    android:password="true"

    />

    <Button 

    android:id="@+id/clear"

    android:text="   Clear    "

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:layout_marginLeft="180dip"

    android:layout_marginTop="168dip"

     />

    <Button

        android:id="@+id/login"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignBaseline="@+id/clear"

        android:layout_alignBottom="@+id/clear"

        android:layout_toRightOf="@+id/tpwd"

        android:text="  Login   " />

</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:

When our application launch, without enter data in the fields if you click on submit button you get a Alert Box with Enter UserName and Password, If you enter UserName and clik on Login Then a Alert Box like Enter Password will get,If you enter Password and clik on Login Then a Alert Box like Enter UserName will get.

If You Enter Both Correct The a Alert With Success...! will Fired. 

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

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