How to Create a Full Screen AlertDialog in Android?
Last Updated :
30 Jan, 2022
AlertDialog in Android is an alert message programmatically displayed to the user over the change of course of action. This appears as a pop-up and has four elements i.e., a title, a message, a positive button, and a negative button. Typically, AlertDialog is non-customized and appears as overlaying box in the center of the screen. However, we can customize it completely.
So in this article, we will show you how you could make a Full-Screen AlertDialog in Android. Follow the below steps once the IDE is ready.
Step by Step Implementation
Step 1: Create a New Project in Android Studio
To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. We demonstrated the application in Kotlin, so make sure you select Kotlin as the primary language while creating a New Project.
Step 2: Working with the activity_main.xml file
Navigate to the app > res > layout > activity_main.xml and add the below code to that file. Below is the code for the activity_main.xml file. Add a button that on click will generate an AlertDialog.
XML
<? xml version = "1.0" encoding = "utf-8" ?>
< RelativeLayout
android:layout_width = "match_parent"
android:layout_height = "match_parent"
tools:context = ".MainActivity" >
< Button
android:id = "@+id/button_1"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:layout_centerInParent = "true"
android:text = "Click" />
</ RelativeLayout >
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Step 3: Working with the MainActivity.kt file
Go to the MainActivity.kt file and refer to the following code. Below is the code for the MainActivity.kt file. Comments are added inside the code to understand the code in more detail.
Kotlin
package org.geeksforgeeks.fullscreendialog
import android.app.AlertDialog
import android.app.Dialog
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super .onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val mButton = findViewById<Button>(R.id.button_1)
mButton.setOnClickListener {
val mBuilder = AlertDialog.Builder( this ,android.R.style.Theme_DeviceDefault_NoActionBar_Fullscreen)
.setTitle( "TITLE" )
.setMessage( "MESSAGE" )
.setPositiveButton( "Positive" , null )
.setNegativeButton( "Negative" , null )
val mAlertDialog = mBuilder.create()
mAlertDialog.show()
}
}
}
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Output:
You can see that the AlertDialog is displaying on full screen.
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