Programming Tutorials

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AlertDialog sample program in Android

By: Ashley in Android Tutorials on 2011年07月02日 [フレーム]

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>

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