Android alert dialog example

In this tutorial, we show you how to display an alert box in Android. See flowing Steps :

  1. First, use the AlertDialog.Builder to create the alert box interface, like title, message to display, buttons, and button onclick function
  2. Later attach above builder to AlertDialog and display it.
  3. Done.

P.S This project is developed in Eclipse 3.7, and tested with Android 2.3.3.

1 Android Layout Files

Simpel layout file, display a button on screen.

File : res/layout/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/buttonAlert"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Show Alert Box" />
            
</LinearLayout>

2. Activity

When user click on this button, display the alert box, with your pre-defined alert dialog interface.

File : MainActivity.java


package com.mkyong.android;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {

	final Context context = this;
	private Button button;

	public void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		button = (Button) findViewById(R.id.buttonAlert);

		// add button listener
		button.setOnClickListener(new OnClickListener() {

		@Override
		public void onClick(View arg0) {

			AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
				context);

			// set title
			alertDialogBuilder.setTitle("Your Title");

			// set dialog message
			alertDialogBuilder
				.setMessage("Click yes to exit!")
				.setCancelable(false)
				.setPositiveButton("Yes",new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog,int id) {
						// if this button is clicked, close
						// current activity
						MainActivity.this.finish();
					}
				  })
				.setNegativeButton("No",new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog,int id) {
						// if this button is clicked, just close
						// the dialog box and do nothing
						dialog.cancel();
					}
				});

				// create alert dialog
				AlertDialog alertDialog = alertDialogBuilder.create();

				// show it
				alertDialog.show();
			}
		});
	}
}

3. Demo

Start it, display a button.

android alert box example

When button is clicked, display the alert box

android alert box example

If “Yes” button is clicked, close the activity and return back to your Android main screen.

android alert box example

Download Source Code

Download it – Android-Alert-Dialogl-Example.zip (16 KB)

References

  1. Android AlertDialog Javadoc
  2. Android Dialog example

About the Author

author image
mkyong
Founder of Mkyong.com, love Java and open source stuff. Follow him on Twitter. If you like my tutorials, consider make a donation to these charities.

Comments

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blaAshlyRoyOm DaveAnu_143# Recent comment authors
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Roy
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Roy

If i want to display the the alert dialog again i have a user/password login alert box and if authentication fails then display it again

bla
Guest
bla

What is the question? Just do it.

Henry
Guest
Henry

Thanks for giving us a simple and easy to understand example. But if you’re looking for more Android AlertDialog example, take a look at this http://www.codeofaninja.com/2011/07/android-alertdialog-example.html

Nagaraj Nidagundi
Guest
Nagaraj Nidagundi

Thank You , Thank You Very Much Teacher,,,,,,,,,,,,,,

Simao
Guest
Simao

PositiveButton has to be Yes and NegativeButton has to be no

Om Dave
Guest
Om Dave

Superb..Sir Thanx lot Today is my first Day with Android and i learnt a lot…

D.Castt
Guest
D.Castt

Thanks mate, very concise.

Vino
Guest
Vino

Thanks a ton :)

Ahmed Soliman Flasha
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Ahmed Soliman Flasha

Thank u very much

Grebenko Alex
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Grebenko Alex

Thanks a lot, tutorial is great!

Chris
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Chris

thanks for this great help
finally i can finish this project :)

Edward Warren
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Edward Warren

Very well done. Thank you for taking the time to do this.

Simao
Guest
Simao

Thanks a lot, that helped me!

Yahya
Guest
Yahya

Thanks

Vinoj John Hosan
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Vinoj John Hosan

Easy and quick… Thank you

John
Guest
John

Thanks! This really helped me out =]

red1
Guest
red1

thank you, it’s really helpful

farhan shah
Guest
farhan shah

Nice Work..Thanks Alot for Saving my time..

Pratik Shah
Guest
Pratik Shah

How to use intent in alert dialog box?

dzerry
Guest
dzerry

Thank you so much. It helps a lot. God Bless you

vipul
Guest
vipul

This is working perfectly. But I have one question. Developer.android.com says alertDialogs can work in API>11. so how is this working in Android 2.3.3?

fuck@fucker.com
Guest
fuck@fucker.com

Ass hole

Phaggot
Guest
Phaggot

LOL you’re a faggot, cunt

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Guest
computer coupons australia

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El
Guest
El

Thanks for the tips!

Cheers!

trackback
I want to add a pop-up dialogue box in my android app : Android Community - For Application Development
Cindy
Guest
Cindy

Thank you so much for this tutorial! It was as clear as I could hope for, and now I can make alerts!

Rumit Patel
Guest
Rumit Patel

Thank you VeRy much,

but can i make buttons vertically with this code??

i make it with this code,

——————————————————————————-
Context context = this;
Dialog dialog = new Dialog(context);
dialog.setContentView(R.layout.context_layout2);
dialog.show();
———————————————————————————

but,
how can i use setOnClickListener on each of the buttons?

Zen
Guest
Zen

you can inflate the view first before adding it to the AlertDialog. in between that, you can add listeners there.

Rumit Patel
Guest
Rumit Patel

Thank you, it was really helpful.

John
Guest
John

Hi, I’d like to override some methods of AlertDialog Class, therefore I Extend the AlertDialog Class: MyAlertDialog alertDialog = (MyAlertDialog) alertDialogBuilder.create(); instead of mkyong’s code: AlertDialog alertDialog = alertDialogBuilder.create(); Extended class: public class MyAlertDialog extends AlertDialog { public MyAlertDialog (Context context) { super (context); Log.i(TAG,"MyAlertDialog constructor 1"); } public MyAlertDialog (Context context,int theme) { super (context,theme); Log.i(TAG,"MyAlertDialog constructor 2"); } public MyAlertDialog (Context context, boolean cancelable, DialogInterface.OnCancelListener cancelListener) { super (context,cancelable,cancelListener); } } When I run the app, I get a runtime error (What is wrong?): 02-09 02:17:35.709: W/dalvikvm(20492): threadid=1: thread exiting with uncaught exception (group=0x40018578) 02-09 02:17:35.709: E/AndroidRuntime(20492): FATAL… Read more »

Doublemx2
Guest
Doublemx2

The return object of
alertDialogBuilder.create();
is an AlertDialog object. An instance of AlertDialog can be cast to subclasses of AlertDialog. It can however be cast down to any class AlertDialog extends. It’s like saying a generic Object instance can be cast to anything. Essentially your approach is impossible. You’d have to make your own builder whose return is an instance of your class. Or work directly with methods provided to AlertDialog (and it’s subclasses). I suggest you do it mkyong’s way.

Jayanth
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Jayanth

Thank you for the information, it really helped a lot.

Sr?an Sukara
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Sr?an Sukara

Thank you, it was really helpful.