## Introduction
In this tutorial, you will learn how to write a killer augmented reality mobile app.
First, I will walk you through how to set up your development environment. Then I will show you how to create a simple augmented reality app. After that, we will move on to more advanced topics such as:
– Creating your own custom 3D models
– Using the Google ARCore API to detect and track 3D objects in the real world
– Interacting with the 3D model in real time
## Prerequisites
You will need the following to complete this tutorial:
– Android Studio 3.1.3 or higher
– An Android device with Android 7.0 (API level 24) or higher installed
– A computer running Windows or Mac OS X
If you are using Windows, you can download and install Android Studio from the Google Play Store.
Once Android Studio is installed, open the app and click on File New. Select Import Project and navigate to the folder where you have downloaded this tutorial. Click on Next and follow the on-screen instructions to import this project into your Android Studio project.
## Setting Up Your Development Environment
The first thing you will need to do is create a new Android Virtual Device (AVD) on your computer. This AVD will be used to test your app on a real Android device. You can create an AVD by clicking on the AVD Manager icon in the toolbar of Android Studio and selecting Create Virtual Device. You will then be prompted to select the device you want to create the AVD for. Choose Android 7.1 (API 24) and click the Create button. Once your AVD is created, click on it and select Run. This will start the Android emulator and you will be able to test the app on your real device.
## Creating a Simple AR App
Now that you have set up a development environment, it is time to create your first AR app. We will start by creating a simple app that displays a 3D object on the screen and allows the user to move the object around the screen. To create this app, follow these steps:
1. Open Android Studio.
2. In the menu bar, select File New Project.
3. Select the Blank Activity template.
4. Name the project `SimpleAR`.
5. Click the OK button to open the New Project dialog.
6. On the left side of the dialog, select the Modules tab.
7. Click Add and select the following modules:
– Core: This module will contain the core functionality of your app. In this case, we are going to create an app that detects and tracks the position of an object in the user’s environment and displays it on the device’s screen. We are also going to use the Google ARCore API to do this.
8. Click OK to save the project.
9. Open the `core` module in the `build.gradle` file.
10. Add the following dependencies to the `dependencies` section of the file
11. Open `MainActivity.java` and add the following code to the onCreate() method. This method is called when the app is first launched.
12. Create a new instance of the `GoogleARCore` class.
13. Call the `initialize()` method to initialize the ARCore service.
14. Create an instance of an `ARAnchor` object. This object is used to detect the position and orientation of a real-world object.
15. Set the `anchor` property of the object to the anchor you created in the previous step.
16. Use the `getTrackingState()` and `setTrackingRegion()` methods to set the region in which the object will be tracked.
17. Use `getLastTrackingResult()` to get the last tracking result.
18. If the tracking result is `TRACKINGNOTSUPPORTED`, use the `setAutoTrackingEnabled(boolean)` method and set the `autoTracking` property to `true` to enable auto-tracking.
19. Add a `TextView` and a `Button` to the layout.
20. Connect the `onClick()` event of the button to the method `onButtonClick()`.
21. Implement the method.
22. Run the app. You should see a button and a text view. When you click on the button, the text view should change to the name of the anchor that you created.