Creating Android apps requires knowledge of programming languages and frameworks, as well as familiarity with mobile app development tools. Here are the steps to create an Android app:

1. Choose a development platform: There are several platforms available for developing Android apps, such as Android Studio, Xamarin, and React Native. Android Studio is the official IDE for Android app development, and it is widely used by developers.
2. Learn programming languages: Android app development requires knowledge of programming languages such as Java, Kotlin, and C++. Java is the primary language used for Android app development, but Kotlin is gaining popularity due to its concise syntax and ease of use.
3. Build the user interface: Android Studio provides a visual editor that allows you to drag and drop elements to create the user interface of your app. You can also use XML layout files to define the UI elements and their properties.
4. Add functionality: You can use Java or Kotlin to add functionality to your app, such as data storage, network connectivity, and user input handling.
5. Test the app: You can use Android Studio’s emulator or connect your Android device to test the app. Make sure to test the app on different devices and screen sizes to ensure that it works correctly.
6. Publish the app: Once your app is tested and ready, you can publish it on the Google Play Store. You need to create a developer account, pay a one-time registration fee, and follow the guidelines for publishing apps.

The technology used to create Android apps includes:

1. Java or Kotlin programming language
2. Android Software Development Kit (SDK)
3. Android Studio IDE
4. XML layout files
5. RESTful APIs for network connectivity
6. Firebase for data storage and authentication.

There are also several third-party libraries and frameworks available for Android app development, such as Retrofit, Glide, and RxJava, which can simplify the development process and speed up app development.