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Home Android Development Android AlertDialog – Example

AlertDialog is used to show pop up alert to the user in a Dialog box. In this tutorial we are going to show you how to implement AlertDialog in Android with a example.

Creating Project:

Make sure you have properly setup the Android SDK, AVD for Testing the Application. Create a New project in Eclipse IDE with the package as “learn2crack.alertdialog”. Create the Main Activity as “MainActivity” and the main Layout as “activity_main”.

android alertdialog

Creating Project in Ecipse

Download Complete Project:

Creating Layout:

The Main layout for our project is “activity_main” which has a button to show the AlertDialog.

activity_main.xml

<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:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/showbtn"
        android:text="Show Dialog"/>

</LinearLayout>

Creating Activity:

In our MainActivity “AlertDialog.Builder” is used to create a new AlertDialog. Here “builder” is the new AlertDialog interface. “setTitle” is used to assign title of the pop up dialog interface, “setMessage” is used to set a custom message in the Dialog.The “setPositiveButton”, “setNegativeButton”, “setNeutralButton” are used to add button to the Dialog. On button click here I used Toast to show a message.

MainActivity.java

package learn2crack.alertdialog;

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

public class MainActivity extends Activity {

	Button Show;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		Show = (Button)findViewById(R.id.showbtn);

		Show.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View view) {
				// TODO Auto-generated method stub
				AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
				builder.setTitle("Alert Dialog");
				builder.setMessage("This is Example of Alert Dialog with three Buttons");
				builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {

					@Override
					public void onClick(DialogInterface arg0, int arg1) {
						// TODO Auto-generated method stub
						Toast.makeText(getApplicationContext(), "Ok is clicked", Toast.LENGTH_LONG).show();

					}
				});
				builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

					@Override
					public void onClick(DialogInterface arg0, int arg1) {
						// TODO Auto-generated method stub
						Toast.makeText(getApplicationContext(), "Cancel is clicked", Toast.LENGTH_LONG).show();

					}
				});
				builder.setNeutralButton("Close", new DialogInterface.OnClickListener() {

					@Override
					public void onClick(DialogInterface arg0, int arg1) {
						// TODO Auto-generated method stub
						Toast.makeText(getApplicationContext(), "Close is clicked", Toast.LENGTH_LONG).show();

					}
				});
				builder.show(); //To show the AlertDialog

			}
		});

	}

}

Creating Manifest:

No other special Permissions are required for our project.

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="learn2crack.alertdialog"
    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="learn2crack.alertdialog.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>

Finally run the project in the Emulator.

android alertdialog

MainActivity

android alertdialog

AlertDialog with Button

android alertdialog

Shows Toast when Ok is clicked

Enjoy 🙂
Any questions comment here.

Raj Amal

Raj Amal

Developer at Learn2Crack
Raj Amal is an Android Developer. He Loves to code and explores new technologies. He also authored a book Learning Android Google Maps
Raj Amal
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