Hello World

Create a new project.
- Activity type: Empty Views Activity
- Name: Hello World. This is the name of the app in the launcher.
- Package name: Use your own domain, or edu.miami.cs.your_name.helloworld. This is the package namespace, and also sets the package name under which the stub Activity will be generated.
- Save location: This is the directory that will contain the project files. Make it somewhere sensible on your disk where you can keep all your Android projects - make a new directory! Don't put spaces or funky characters in this.
- Language: Java
- Minimum SDK: API 28 ("Pie"; Android 9.0)
- Build configuration language: Groovy DSL (build.gradle)
- Accept the other defaults
- Finish
Android Studio will create a stub application, with all the necessary files.
Build and run the application on the emulator
- Ensure an emulator is running (see Software for Android Development)
- Click the run button.
- On the emulator, back out of the app, navigate to the applications page and run it again.
Check out the source
- Note that the activity extends AppCompatActivity. This is a class for apps that use an action bar. Alternatives include FragmentActivity for apps that use fragments, and plain Activity for plain UIs.
- You can rename the MainActivity, etc.
- Code
  MainActivity.java
  activity_main.xml
  strings.xml
  AndroidManifest.xml
Deploying onto a real phone
- Connect with USB cable.
- Set up your device for Android development (see Software for Android Development)
- Run adb devices to see if your computer sees your phone.
- Click the run button in Android Studio and choose your device.