Android Program on Alert Dialog box

We use Java file, Xml file and Manifest file to make a app for Alert Dialog box. In xml file we take one text view and three buttons. On the click of any button a dialog box will be open for short period time. We write the message in the toast so it will take some time to show on the screen.In java file every button is performing different actions.

           In manifest file no change will be done. because every permission is ok in manifest file.

activity_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:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context=".MainActivity" >

    <TextView

        android:id="@+id/textView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/hello_world" />

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/textView1"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="64dp"

        android:text="Button" />

    <Button

        android:id="@+id/button2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/button1"

        android:layout_below="@+id/button1"

        android:layout_marginTop="28dp"

        android:text="Button" />

    <Button

        android:id="@+id/button3"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/button2"

        android:layout_below="@+id/button2"

        android:layout_marginTop="30dp"

        android:text="Button" />

</RelativeLayout> 

MainActivity.java

package com.example.alertdialogbox;

import android.os.Bundle;

import android.app.Activity;

import android.app.AlertDialog;

import android.content.DialogInterface;

import android.view.Menu;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity {

Button B1,B2,B3;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

B1=(Button) findViewById(R.id.button1);

B2=(Button) findViewById(R.id.button2);

B3=(Button) findViewById(R.id.button3);

B1.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

final AlertDialog  alertDialog = new AlertDialog.Builder(MainActivity.this).create();

alertDialog.setTitle("Alert Dialog");

alertDialog.setMessage("Welcome to AndroidHive.info");

alertDialog.setIcon(R.drawable.icon_smile);

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

public void onClick(DialogInterface dialog, int which) {

Toast.makeText(getApplicationContext(), "You clicked on OK", Toast.LENGTH_SHORT).show();

}

});

alertDialog.show();

}

});

B2.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

//alertDialog.setButton2(text, listener)

AlertDialog.Builder  alertDialog = new AlertDialog.Builder(MainActivity.this);

alertDialog.setTitle("Alert Dialog");

alertDialog.setMessage("Welcome to google.co.in");

alertDialog.setIcon(R.drawable.icon_smile);

alertDialog.setNegativeButton("NO", new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int which) {

Toast.makeText(getApplicationContext(), "You clicked on NO", Toast.LENGTH_SHORT).show();

}

});

alertDialog.show();

}

});

B3.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

AlertDialog.Builder  alertDialog = new AlertDialog.Builder(MainActivity.this);

alertDialog.setTitle("Alert Dialog");

alertDialog.setMessage("Welcome to AndroidHive.info");

alertDialog.setIcon(R.drawable.icon_smile);

alertDialog.setPositiveButton("YES", new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int which) {

Toast.makeText(getApplicationContext(), "You clicked on YES", Toast.LENGTH_SHORT).show();

}

});

alertDialog.setNegativeButton("NO", new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int which) {

Toast.makeText(getApplicationContext(), "You clicked on NO", Toast.LENGTH_SHORT).show();

}

});

alertDialog.show();

}

});

}

}

manifest.xml

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

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

    package="com.example.alertdialogbox"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="18" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.example.alertdialogbox.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>