When we want to implement an exit AlertDialog in our android application we have to programmatically exit our android application. In this article, we will take a look at How to Quit the Android application programmatically. We will be adding a button and on clicking on that button we will be closing our application. A sample video is given below to get an idea about what we are going to do in this article.
Note: This Android article covered in both Java and Kotlin languages.
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.
Step 2: Working with the activity_main.xml file
Navigate to app > res > layout > activity_main.xml and add the below code to it. Comments are added in the code to get to know in detail.
XML
<?xml version="1.0" encoding="utf-8"?><RelativeLayout android:id="@+id/idRLContainer" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity"> <!--on below line we are creating a text for our app--> <TextView android:id="@+id/idTVHeading" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_above="@id/idBtnCloseApplication" android:layout_centerInParent="true" android:layout_margin="20dp" android:gravity="center" android:padding="10dp" android:text="Click the button to close the application" android:textAlignment="center" android:textColor="@color/black" android:textSize="20sp" android:textStyle="bold" /> <!--on below line we are creating a button--> <Button android:id="@+id/idBtnCloseApplication" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_centerInParent="true" android:layout_margin="20dp" android:text="Close the application" android:textAllCaps="false" /> </RelativeLayout> |
Step 3: Working with the MainActivity file
Navigate to app > java > your app’s package name > MainActivity file and add the code below. Comments are added in the code to get to know in detail.
Kotlin
package com.gtappdevelopers.kotlingfgproject import android.os.Bundleimport android.widget.Buttonimport androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() { // on below line we are creating a variable. lateinit var closeApplicationBtn: Button override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) // on below line we are creating and // initializing variable for activity val activity: MainActivity = MainActivity() // on below line we are initializing our variables. closeApplicationBtn = findViewById(R.id.idBtnCloseApplication) // on below line we are adding click listener for our button closeApplicationBtn.setOnClickListener { // on below line we are finishing activity. activity.finish() // on below line we are exiting our activity System.exit(0) } }} |
Java
package com.gtappdevelopers.kotlingfgproject; import android.os.Bundle;import android.view.View;import android.widget.Button;import androidx.appcompat.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { // on the below line we are creating a variable. private Button closeApplicationBtn; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // on below line we are initializing variables with ids. closeApplicationBtn = findViewById(R.id.idBtnCloseApplication); // on below line we are adding click listener for our button closeApplicationBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // on below line we are finishing activity. MainActivity.this.finish(); // on below line we are exiting our activity System.exit(0); } }); }} |
Now run your application to see the output of it.
Output:
