How to declare Global variables in Android?

Here's how to declare global variables in Android:

Declaring Global Variables

1. Create a custom Application class

   • Create a new class that extends android.app.Application.
   • Declare your global variables as instance variables in this class.

2. Override the onCreate() method

   • Override the onCreate() method and initialize your global variables.

3. Register the custom Application class in the manifest

   • Open the AndroidManifest.xml file.
   • Find the <application> tag.
   • Add the android:name attribute and set it to the fully qualified name of your custom Application class.

Example:

public class MyApplication extends Application {
    public static final String API_KEY = "your_api_key";
    public static int counter = 0;

    @Override
    public void onCreate() {
        super.onCreate();
        // Initialize global var...