Hello Android example

Creating a “Hello, Android” example is a common starting point for beginners to get familiar with Android app development. In this example, we’ll create a simple Android app that displays the text “Hello, Android!” on the screen. Here are the steps to create this basic Android app:

Set Up Your Development Environment: Before you begin, make sure you have Android Studio installed and configured on your computer. You can download Android Studio from the official Android developer website.

Create a New Android Project: Open Android Studio and click on “Start a new Android Studio project” or go to File > New > New Project.

• Choose an appropriate project template, such as “Empty Activity” or “Basic Activity.”
• Set a name for your project and choose a package name.
• Select the programming language you prefer (Java or Kotlin).
• Click “Finish” to create your project.

Design the Layout: Open the XML layout file for your main activity (activity_main.xml) in the res/layout directory. Replace the existing layout with a TextView to display the “Hello, Android!” text:

 <?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"
     android:padding="16dp"
     tools:context=".MainActivity">

     <TextView
         android:id="@+id/helloTextView"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="Hello, Android!"
         android:textSize="24sp"
         android:layout_centerInParent="true" />

 </RelativeLayout>

Update the Activity Code: Open the main activity file (usually MainActivity.java or MainActivity.kt) in the src directory. Add the following code to set up the TextView and display the “Hello, Android!” message: Java:

 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
 import android.widget.TextView;

 public class MainActivity extends AppCompatActivity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         // Find the TextView by its ID
         TextView helloTextView = findViewById(R.id.helloTextView);

         // Set the text for the TextView
         helloTextView.setText("Hello, Android!");
     }
 }

 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
 import kotlinx.android.synthetic.main.activity_main.*

 class MainActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)

         // Set the text for the TextView
         helloTextView.text = "Hello, Android!"
     }
 }

Run Your App: Connect a physical Android device to your computer or use an Android Virtual Device (AVD) from Android Studio. Click the “Run” button in Android Studio to build and run your app. After a moment, your app will launch on the device or emulator, and you should see the “Hello, Android!” message displayed on the screen.

Finally! You’ve created a basic “Hello, Android” app. This simple example demonstrates the essential steps of creating an Android app, including setting up the layout, modifying the activity code, and running the app on a device or emulator. You can use this as a starting point to learn and explore more advanced Android app development concepts.