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Android alert dialog example

IT Person | 17:58 | , , ,
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.
When button is clicked, display the alert box
 
If “Yes” button is clicked, close the activity and return back to your Android main screen.
 

Download Source Code

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

 

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How to add and arrange home screens in Android 4.4 KitKat

IT Person | 16:46 | , ,

How to add more home screens in Android 4.4 KitKat

 





The launcher — the app that controls how your home screens look and act — arguably is the most important part of an Android smartphone. And from the earliest devices, we've seen manufacturers and app developers diverge from Google's solution and roll their own interpretations. (To varying degrees of success, for sure.)
In Android 4.4 KitKat, Google changed things up once more adding a couple of simple but much-needed features — the ability to add home screens, and the ability to rearrange your home screens.
Oh, Google Now is still attached to the far left — that's not going anywhere anytime soon, probably. But these new additions are welcomed, and easy to get used to.
We've got your primer videos after the break.
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Switching launchers with Android 4.4's new 'Home' setting

IT Person | 16:42 | ,

KitKat makes it easier to swap or uninstall custom launchers

Many of us enjoy using custom home screen launchers on our Android phones, but the process of switching between them has never been entirely foolproof. That's changed in the latest Android 4.4 KitKat, which introduces a new top-level menu in the Settings app allowing you to select your default launcher. That means you don't have to traipse into the Apps menu, find your custom launcher, then clear its defaults to change back. The new Home menu also gives you an easy way to uninstall custom launchers, by pressing the trash icon next to it.
Check out our video above for a quick walkthrough on the Nexus 5.
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