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=""
    android:orientation="vertical" >
        android:text="Show Alert Box" />

2. Activity

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

File :

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) {
		button = (Button) findViewById(;
		// add button listener
		button.setOnClickListener(new OnClickListener() {
		public void onClick(View arg0) {
			AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
			// set title
			alertDialogBuilder.setTitle("Your Title");
			// set dialog message
				.setMessage("Click yes to exit!")
				.setPositiveButton("Yes",new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog,int id) {
						// if this button is clicked, close
						// current activity
				.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
				// create alert dialog
				AlertDialog alertDialog = alertDialogBuilder.create();
				// show it;

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 – (16 KB)


  1. Android AlertDialog Javadoc
  2. Android Dialog example
Tags :

About the Author

Founder of and, love Java and open source stuff. Follow him on Twitter, or befriend him on Facebook or Google Plus. If you like my tutorials, consider make a donation to these charities.


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  • Ganmo

    Hi, I notice that you create the AlertDialog directly in the main activity. Is this the normal way to go. Because in a way I think creating too many things in the main activity will clutter it. Should it be created in XMLs instead? Hope you understand what I mean.

  • red1

    thank you, it’s really helpful

  • farhan shah

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

  • Pratik Shah

    How to use intent in alert dialog box?

  • dzerry

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

  • vipul

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

  • kush ahuja

    hello , there seems to be another out of the world problem with me.
    -Every time i run the application it gets compiled up nicely and launches the application but as soon as i hit the “button” on app it says the application has stopped unfortunately.
    -This kinda things happen with my other applications also sometime even though there’s no error neither any kind of warning in the project.

    I’ll b e looking forward for your help.

  • [email protected]

    Ass hole

    • Phaggot

      LOL you’re a faggot, cunt

  • computer coupons australia

    Hi, i think that i saw you visited my weblog so i came to _return the favor_.
    I’m attempting to find things to improve my website!I suppose its ok to use some of your ideas!!

  • El

    Thanks for the tips!


  • Somesh

    Very good code. May I have your mail id to contact my queries

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  • 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

    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);

    how can i use setOnClickListener on each of the buttons?

    • Zen

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

  • Rumit Patel

    Thank you, it was really helpful.

  • John


    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,&quot;MyAlertDialog constructor 1&quot;);
    		public MyAlertDialog (Context context,int theme) {
    			super (context,theme);
    			Log.i(TAG,&quot;MyAlertDialog constructor 2&quot;);
    		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 EXCEPTION: main
    02-09 02:17:35.709: E/AndroidRuntime(20492): java.lang.ClassCastException:
    02-09 02:17:35.709: E/AndroidRuntime(20492): at com.example.filepicker3.FilePickerActivity.showFileDetailsDialogAlarm(
    02-09 02:17:35.709: E/AndroidRuntime(20492): at com.example.filepicker3.FilePickerActivity.onItemLongClick(
    02-09 02:17:35.709: E/AndroidRuntime(20492): at android.widget.AbsListView.performLongPress(
    02-09 02:17:35.709: E/AndroidRuntime(20492): at android.widget.AbsListView.access$600(
    02-09 02:17:35.709: E/AndroidRuntime(20492): at android.widget.AbsListView$
    02-09 02:17:35.709: E/AndroidRuntime(20492): at android.os.Handler.handleCallback(
    02-09 02:17:35.709: E/AndroidRuntime(20492): at android.os.Handler.dispatchMessage(
    02-09 02:17:35.709: E/AndroidRuntime(20492): at android.os.Looper.loop(
    02-09 02:17:35.709: E/AndroidRuntime(20492): at
    02-09 02:17:35.709: E/AndroidRuntime(20492): at java.lang.reflect.Method.invokeNative(Native Method)
    02-09 02:17:35.709: E/AndroidRuntime(20492): at java.lang.reflect.Method.invoke(
    02-09 02:17:35.709: E/AndroidRuntime(20492): at$
    02-09 02:17:35.709: E/AndroidRuntime(20492): at
    02-09 02:17:35.709: E/AndroidRuntime(20492): at dalvik.system.NativeStart.main(Native Method)

    • Doublemx2

      The return object of
      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

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

  • Sr?an Sukara

    Thank you, it was really helpful.

  • jyoti

    nice tutorails..this code help me a lot….

  • Suthu

    HI Yong,

    This example looks very simple. My question is is this enough to run the program. Here is another example which has more codes for writing the dialog box. Anyway, thank you for the cleaner explanation.

  • Robert

    Great Post.It really got me out of a fix.Thanks

  • Jairo

    I cant seem to run the application, always appear a error in console

    [2012-12-07 21:12:07 – MainActivity] ——————————
    [2012-12-07 21:12:07 – MainActivity] Android Launch!
    [2012-12-07 21:12:07 – MainActivity] adb is running normally.
    [2012-12-07 21:12:07 – MainActivity] Performing activity launch
    [2012-12-07 21:12:07 – MainActivity] Automatic Target Mode: launching new emulator with compatible AVD ‘JairoGalaxyNexus’
    [2012-12-07 21:12:07 – MainActivity] Launching a new emulator with Virtual Device ‘JairoGalaxyNexus’
    [2012-12-07 21:12:12 – Emulator] Failed to allocate memory: 8
    [2012-12-07 21:12:12 – Emulator]
    [2012-12-07 21:12:12 – Emulator] This application has requested the Runtime to terminate it in an unusual way.
    [2012-12-07 21:12:12 – Emulator] Please contact the application’s support team for more information.

    what Im I doing wrong?

  • Carlos G. González

    great work! Thanks!!

  • pradeep

    Thanks for giving this peace of code .which is very useful for me.

  • Mihail Velikov

    Hello Yong Mook,
    I have already seen that you have such a great experience in Android Development it is real pleasure to see that you help others with your tutorials!
    Thank you!

  • Naveed Iqbal

    Thanks Mkyong, your examples are always self explanatory.

  • phoodograph

    Thanks for the tutorials. They are straight to the point and simple. I can come to your site and learn what I need to in a matter of seconds or minutes. Other sites drag stuff out too much. For this tut, they would have a page or two going on and on about a simple concept and making it much more complicated than it actually is.

    Please keep up the great work! Thanks!!

  • cris

    hi. thanks for sharing this’s very understandable.i always find your site better than others in tutorials.keep up the good work :)

  • android

    mkyong Thanks for sharing. This article is very useful for android dev.

  • tofeeq

    Thanx mykong for posting such useful info. I also posted about dialog that cover everything about dialog in android.


  • Özgür GÜL

    Thank you Yong Mook.

  • Christian Peeters


    Thanks for sharing this code, much appreciated.

    It really helped me to get the dialog box working. My first try i forgot to define this variable, instead i used GetApplicationContext()

    “final Context context = this;”

    After adding “”final Context context = this;” in:

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

    The dialog box was working.

    But can you explain why you need to define the variable contex = this; why does GetApplicationContext not work?


  • Amit

    Thanks for sharing this awesome peace of code, I really appreciate this…

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