Programming Tutorials

AlertDialog sample program in Android

By: Ashley in Android Tutorials on 2011-07-02  

This sample android program shows you how to use an Alert Dialog box in Android.

The AlertDialogDemo.java file is as follows:

package com.javasamples;

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

public class AlertDialogDemo extends Activity {
	Button btnGo;
	EditText txtMsg;
	String msg;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        txtMsg =  (EditText)findViewById(R.id.txtMsg);
        
        btnGo = (Button) findViewById(R.id.btnGo);
        btnGo.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
				AlertDialog diaBox = makeAndShowDialogBox();
								
			    diaBox.show();
			    
				txtMsg.setText("I am here!");
			}
        	
        });
    }//onCreate
    



	private AlertDialog makeAndShowDialogBox(){
    	
        AlertDialog myQuittingDialogBox = 

        	new AlertDialog.Builder(this) 
        	//set message, title, and icon
        	.setTitle("Terminator") 
        	.setMessage("Are you sure that you want to quit?") 
        	.setIcon(R.drawable.ic_menu_end_conversation)
        	
        	//set three option buttons
        	.setPositiveButton("Yes", new DialogInterface.OnClickListener() { 
        		public void onClick(DialogInterface dialog, int whichButton) { 
            	 //whatever should be done when answering "YES" goes here
        		 msg = "YES " + Integer.toString(whichButton);
        		 txtMsg.setText(msg);
        		}              
        	})//setPositiveButton
        /*	.setNeutralButton("Cancel", new DialogInterface.OnClickListener() { 
        		public void onClick(DialogInterface dialog, int whichButton) { 
            	 //whatever should be done when answering "NO" goes here
        		 msg = "Cancel " + Integer.toString(whichButton);	
        		 txtMsg.setText(msg);
        		}
        		})*/


        	.setNegativeButton("NO", new DialogInterface.OnClickListener() { 
        		public void onClick(DialogInterface dialog, int whichButton) { 
            	 //whatever should be done when answering "NO" goes here
        		 msg = "NO " + Integer.toString(whichButton);	
        		 txtMsg.setText(msg);
             } 
        	})//setNegativeButton
        	
        	.create();
        	
        	return myQuittingDialogBox;
    }
    
}//AndSelectionWidgets

The output is as shown in the emulator below

The main.xml file in your res/layout folder is as follows:

<LinearLayout 
    android:id="@+id/LinearLayout01"
	android:layout_width="fill_parent" 
	android:layout_height="fill_parent"
	xmlns:android="http://schemas.android.com/apk/res/android" 
	android:orientation="horizontal">
	<Button 
	   android:text="GO" 
	   android:id="@+id/btnGo" 
	   android:layout_width="wrap_content" 
	   android:layout_height="wrap_content">
	 </Button>
	 <EditText 
	   android:hint="click the button" 
	   android:id="@+id/txtMsg"
	   android:layout_width="fill_parent" 
	   android:layout_height="wrap_content">
	 </EditText>

</LinearLayout>