IntelliJ IDEA is a versatile IDE developed by JetBrains that supports a variety of programming languages, including Java, Kotlin, and many others. Although Android development is primarily associated with Android Studio—which is built on the IntelliJ IDEA framework—setting up IntelliJ IDEA for Android app development can be an alternative for developers who wish to use it for various reasons, such as familiarity with the IDE or using it for multiple types of projects beyond just Android.

Pre-requisites:

Before setting up IntelliJ IDEA for Android development, ensure that you have downloaded and installed the following:

• JDK (Java Development Kit): Essential for any Java development, including Android.
• IntelliJ IDEA: Either the Ultimate or Community version, though the Community version is free and open-source.

Installation and Setup Procedures:

Here's how you can set up IntelliJ IDEA for Android applications:

Step 1: Install the Android SDK

• The Android SDK provides the necessary APIs and tools needed to develop, test, and debug Android applications. IntelliJ IDEA does not come with a built-in Android SDK, so you'll need to install it separately.
• You can download the Android SDK from the Android Studio pages or as part of the standalone SDK tools from Google.

Step 2: Configure the Android SDK in IntelliJ IDEA

1. Open IntelliJ IDEA.
2. Navigate to File > Project Structure.
3. Under the "SDKs" entry in the left panel, click the '+' button and select "Android SDK".
4. Navigate to the directory where you installed the Android SDK and select it. IntelliJ IDEA will load the SDK components.
5. Set the Java SDK as well, which should match the Java version used for your Android development.

Step 3: Create a New Android Project

1. Go to File > New > Project.
2. From the options on the left, select "Android".
3. Enter the project details like name, save location, and the SDK versions. If the Android option is not visible, ensure the plugin is enabled in Settings/Preferences > Plugins.
4. Follow the wizard to set up project specifics like the API level and the activity type.

Step 4: Configure an Emulator or Connect a Physical Device

• To run and test your Android applications, you'll need an Android emulator or a physical device.
• Emulator setup: You can download and manage emulators through the AVD Manager (Android Virtual Device Manager), which is available in Android Studio. The configurations can be imported into IntelliJ IDEA.
• Physical device: Enable USB debugging on your Android device and connect it to your computer. IntelliJ IDEA will automatically detect the device if the USB drivers are installed correctly.

Running Your First App

Once you have your environment set up, test it by running a simple application:

1. Right-click on your project in the project explorer.
2. Select Run 'app'.
3. Choose the deployment target (emulator or physical device) and observe your app running.

Tips and Troubleshooting

• Plugins: Always ensure that the Android plugin is updated in IntelliJ IDEA for compatibility.
• Performance: IntelliJ IDEA might be slower on older machines, especially when using emulators. Allocating more RAM to the IDE and the emulator can improve performance.
• Updates: Keeping the Android SDK, IntelliJ IDEA, and all related plugins updated ensures compatibility and access to the latest features.

Summary Table

Setting up IntelliJ IDEA for Android development allows developers the flexibility to stay within an environment they are comfortable and efficient in, all while leveraging the robust toolsets provided by the IntelliJ IDEA platform for Android application development. This process might seem a bit complex compared to using Android Studio directly, but it offers the advantage of a unified environment for developers working across different technology stacks.