To create a HelloWorld Activity using all lifecycles methods to display messages using Android Studio.
Latest Version Android Studio
Step 1: Open Android Stdio and then click on File -> New -> New project.
Step 2: Then type the Application name as HelloWorld and click Next.
Step 3: Then select the Minimum SDK as shown below and click Next.
Step 4: Then select the Empty Activity and click Next. Finally click Finish.
Step 5: Design layout in activity_main.xml.
Step 6: Display message give in MainActivity file.
Step 7: Save and run the application.
/*
Program to print the text “Hello World”.
Developed by: Mohammed Nafeez Kamal S
Registeration Number : 212221040106
*/
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
android:background="#EDE177"
tools:context=".MainActivity">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/app_name"
android:textColor="#F40B0B"
android:textSize="40sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
package com.example.helloworld;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toast.makeText(getApplicationContext(), "OnCreate called", Toast.LENGTH_LONG).show();
}
protected void onStart(){
super.onStart();
Toast toast = Toast.makeText(getApplicationContext(), "OnStart called", Toast.LENGTH_LONG);
toast.show();
}
protected void onRestart(){
super.onRestart();
Toast toast = Toast.makeText(getApplicationContext(), "OnRestart called", Toast.LENGTH_LONG);
toast.show();
}
protected void onStop(){
super.onStop();
Toast toast = Toast.makeText(getApplicationContext(), "OnStop called", Toast.LENGTH_LONG);
toast.show();
}
protected void onPause(){
super.onPause();
Toast toast = Toast.makeText(getApplicationContext(), "OnPause called", Toast.LENGTH_LONG);
toast.show();
}
protected void onDestroy(){
super.onDestroy();
Toast toast = Toast.makeText(getApplicationContext(), "OnDestroy called", Toast.LENGTH_LONG);
toast.show();
}
}
Thus a Simple Android Application create a HelloWorld Activity using all lifecycles methods to display messages using Android Studio is developed and executed successfully.