Learn More About Android Framework & Application Layer 🚀

Photo by Rayner Simpson on Unsplash

Introduction to Android Framework Components:

1. Activity: Activities represent the user interface and user interactions within an Android application. Each screen or UI component is typically represented by an activity. Activities are managed by the Android system and can be launched, paused, resumed, and destroyed as the user navigates through the app.
2. Service: Services are background processes that can run independently of the UI. They are often used for tasks that need to continue running even when the app is not in the foreground, such as playing music or handling network requests.
3. BroadcastReceiver: BroadcastReceivers are components that listen for system-wide broadcast messages or custom events. They allow applications to respond to events like incoming SMS messages, network connectivity changes, or low battery alerts.
4. ContentProvider: ContentProviders are used to manage and share structured data across applications. They allow apps to access and modify data from other apps, such as contacts, calendars, and media files, in a consistent and secure manner.
5. Fragment: Fragments are reusable UI components that can be combined within an activity to create flexible and responsive user interfaces. They are often used to build apps that work well on both phones and tablets.
6. Intent: Intents are a messaging mechanism that allows components to request actions from other components, either within the same app or between different apps. Intents are used for starting activities, services, and broadcasting events.

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Key System Services & Interaction with Application Layer:

1. Activity Manager: The Activity Manager is a system service responsible for managing the lifecycle of activities. It decides which activity should be in the foreground, handles the creation and destruction of activities, and manages their state.
2. Package Manager: The Package Manager is responsible for installing, updating, and removing applications on the Android device. It also provides information about installed apps, such as permissions and package names.
3. Content Resolver: The Content Resolver is a system service that allows applications to interact with ContentProviders. It provides a unified interface for querying, inserting, updating, and deleting data from various content providers, such as the Contacts or MediaStore.
4. Notification Manager: The Notification Manager is responsible for displaying notifications to the user. Applications can use this service to create and manage notifications that appear in the notification shade.
5. Location Manager: The Location Manager provides access to device location services, such as GPS and network-based location. Apps can use this service to request the user’s location for various purposes, such as mapping or location-based services.
6. Connectivity Manager: The Connectivity Manager monitors network connectivity on the device. It allows apps to check the network status and respond to changes, such as switching between Wi-Fi and mobile data.
7. Sensor Manager: The Sensor Manager provides access to various sensors available on the device, such as the accelerometer, gyroscope, and proximity sensor. Apps can use this service to gather data from sensors for various purposes.
8. Telephony Manager: The Telephony Manager provides information about the device’s telephony status, including network and SIM card information. Apps can use this service to retrieve device-related information or monitor phone call events.

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İbrahim Can Erdoğan

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