Android - Simple Alert Dialog

jon waek · Wednesday at 4:47 PM

Operating System

Android

In this tutorial we will try to create a Simple Alert Dialog Using Android. Android is the world’s most widely used operating system with over a millions of user, that are already installed to smartphones, tablets, and even television. Android is an open source so that developer find it easy to develop and expand new features. So let's do the coding...

Getting Started:

First you will have to download & install the Android Development IDE (Android Studio or Eclipse). Android Studio is an open source development feel free to develop your things.

Here's the link for the Android Studio https://developer.android.com/studio/index.html.

Layout Design

We will now create the design for the application, first locate the activity_main.xml and click text to view the script. Then copy and paste the code below.

<?

xml version=

"1.0"

encoding=

"utf-8"

?>
<

RelativeLayout xmlns:

android=

"http://schemas.android.com/apk/res/android"
xmlns:

app=

"http://schemas.android.com/apk/res-auto"
xmlns:

tools=

"http://schemas.android.com/tools"
android:

layout_width=

"match_parent"
android:

layout_height=

"match_parent"
tools:

context=

"com.razormist.simplealertdialog.MainActivity"

>
<

TextView
android:

layout_height=

"wrap_content"
android:

layout_width=

"wrap_content"
android:

text=

"Simple Alert Dialog"
android:

textSize=

"30sp"
android:

layout_alignParentTop=

"true"
android:

layout_centerHorizontal=

"true"
android:

layout_marginTop=

"20dp"
android:

id=

"@+id/tv_title"

/>
<

Button
android:

id=

"@+id/btn_click"
android:

layout_width=

"wrap_content"
android:

layout_height=

"wrap_content"
android:

layout_centerInParent=

"true"
android:

text=

"Click Here"

/>
</

RelativeLayout>

Android Manifest File

The Android Manifest file provides essential information about your app to the Android system in which the system must required before running the code.

<?

xml version=

"1.0"

encoding=

"utf-8"

?>
<

manifest xmlns:

android=

"http://schemas.android.com/apk/res/android"
package

=

"com.razormist.simplealertdialog"

>
<

application
android:

allowBackup=

"true"
android:

icon=

"@mipmap/ic_launcher"
android:

label=

"@string/app_name"
android:

roundIcon=

"@mipmap/ic_launcher_round"
android:

supportsRtl=

"true"
android:

theme=

"@Style/AppTheme"

>
<

activity android:

name=

".MainActivity"
android:

configChanges=

"orientation"
android:

screenOrientation=

"portrait"

>
<

intent-

filter>
<

action android:

name=

"android.intent.action.MAIN"

/>
<

category android:

name=

"android.intent.category.LAUNCHER"

/>
</

intent-

filter>
</

activity>
</

application>
</

manifest>

The Main Function

This code contains the main function of the application. This code will generate a dialog to prompt the user to what to do next when the button is clicked. To create first locate your java file and open it, then write these blocks of code.

package

com.razormist.simplealertdialog

;
import

android.app.Application

;
import

android.content.DialogInterface

;
import

android.support.v7.app.AlertDialog

;
import

android.support.v7.app.AppCompatActivity

;
import

android.os.Bundle

;
import

android.util.Log

;
import

android.view.View

;
import

android.widget.Button

;
import

android.widget.TextView

;
public

class

MainActivity extends

AppCompatActivity {
Button

btn_click;
@Override
protected

void

onCreate(

Bundle savedInstanceState)

{
super

.onCreate

(

savedInstanceState)

;
setContentView(

R.layout

.activity_main

)

;
btn_click =

(

Button

)

findViewById(

R.id

.btn_click

)

;
btn_click.setOnClickListener

(

new

View

.OnClickListener

(

)

{
@Override
public

void

onClick(

View

v)

{
AlertDialog.Builder

builder=

new

AlertDialog.Builder

(

MainActivity.this

)

;
builder.setMessage

(

"Are you sure you want to exit?"

)
.setTitle

(

"System Configuration"

)
.setCancelable

(

false

)
.setPositiveButton

(

"YES"

, new

DialogInterface.OnClickListener

(

)

{
@Override
public

void

onClick(

DialogInterface dialog, int

which)

{
moveTaskToBack(

true

)

;
android.os

.Process

.killProcess

(

android.os

.Process

.myPid

(

)

)

;
System

.exit

(

1

)

;
}

}

)
.setNegativeButton

(

"NO"

, new

DialogInterface.OnClickListener

(

)

{
@Override
public

void

onClick(

DialogInterface dialog, int

which)

{
dialog.cancel

(

)

;
}
}

)

;
AlertDialog alert =

builder.create

(

)

;
alert.show

(

)

;
}
}

)

;
}
}

There you have it we successfully created a Simple Alert Dialog using android. I hope that this tutorial help you to what you are looking for. For more updates and tutorials just kindly visit this site. Enjoy Coding!!

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