Android apps are software applications that run on the Android OS. They can be installed on Android tablets, phones, and TVs. They are very good in using the camera, touchscreen, and GPS features on the device. There are a lot of apps installed on an Android phone however, could affect the battery’s life and performance.

Understanding the Android platform and its design principles is essential for the development of Android applications. It also requires the implementation of an appropriate architecture for apps that separates UI and OS-related code into components that share responsibilities. The system is able to activate these components in asynchronous fashion using an asynchronous broadcast mechanism that is activated by intentions.

Java is the preferred language for Android development, though Kotlin has gained popularity in recent years. Both are supported by the Android SDK. A large developer community is online to help newcomers to the language understand and resolve issues.

The Android OS itself is divided into several layers, with the app layer containing the standard apps that come with the their explanation operating system, along with the specialized apps that are bundled with a specific device, like the phone dialer or music player. The Android app layer also includes custom firmware such as CyanogenMod and OMFGB, which can be installed on specific devices to modify their functions.

Compatibility is another aspect that prevents certain apps from working. If an app is created for the US but is not compatible with your European device, it won’t work and will be listed in the Play Store as “incompatible”.