Android API Documentation

   

Framework Category	Description	Key Classes/Packages
Activity & Fragment	Fundamental building blocks for user interfaces. Activities represent a single screen with a user interface, while Fragments represent reusable portions of an Activity's UI.	android.app.Activity, androidx.fragment.app.Fragment, android.content.Intent, android.os.Bundle, androidx.appcompat.app.AppCompatActivity
UI (Views & Layouts)	APIs for creating and managing the visual elements of an application's user interface, including layouts (how elements are arranged) and individual UI components (like buttons, text fields, lists).	android.view.View, android.view.ViewGroup, android.widget.* (TextView, EditText, Button, RecyclerView, ListView, etc.), android.view.LayoutInflater, androidx.constraintlayout.widget.ConstraintLayout, androidx.recyclerview.widget.RecyclerView
Application Components	Components that don't have a direct UI but perform background tasks or interact with other applications: Services (for long-running tasks), Broadcast Receivers (for reacting to system-wide events), Content Providers (for managing shared application data).	android.app.Service, android.content.BroadcastReceiver, android.content.Intent, android.content.ContentProvider, android.net.Uri, android.content.Context
Data Storage	APIs for storing and retrieving application data, including shared preferences (for simple key-value pairs), internal/external storage (for files), and SQLite databases (for structured data).	android.content.SharedPreferences, android.content.Context.getSharedPreferences, java.io.File, android.database.sqlite.SQLiteDatabase, android.database.Cursor, androidx.room.* (Room Persistence Library)
Networking	APIs for performing network operations, such as making HTTP requests and working with sockets.	java.net.* (standard Java networking), android.net.ConnectivityManager, android.net.NetworkInfo, android.net.wifi.WifiManager, okhttp3.* (popular third-party library often used), java.net.HttpURLConnection
Location & Sensors	APIs for accessing device location information (GPS, Wi-Fi, cell) and various hardware sensors (accelerometer, gyroscope, etc.).	android.location.LocationManager, android.location.LocationListener, android.hardware.SensorManager, android.hardware.SensorEventListener, android.hardware.Sensor
Permissions	System for declaring and requesting permissions to access sensitive user data or system features.	android.Manifest.permission.*, androidx.core.app.ActivityCompat.requestPermissions, androidx.activity.result.contract.ActivityResultContracts.RequestPermission, androidx.activity.result.contract.ActivityResultContracts.RequestMultiplePermissions
Background Tasks	APIs for managing tasks that run in the background, even when the application is not in the foreground (e.g., using WorkManager for reliable background execution).	androidx.work.* (WorkManager), android.app.AlarmManager, android.content.IntentService (deprecated but still relevant in some older code)
Notifications	APIs for displaying alerts and information to the user outside of the application's UI.	android.app.NotificationManager, android.app.NotificationCompat.Builder, android.app.PendingIntent
Graphics & Multimedia	APIs for drawing graphics (2D and 3D), handling images, audio, and video.	android.graphics.* (Canvas, Paint, Bitmap, Drawable), android.media.* (MediaPlayer, MediaRecorder), android.opengl.* (for OpenGL ES), android.graphics.drawable.*
Telephony & Connectivity	APIs for accessing phone-related information and managing various connectivity options (Wi-Fi, Bluetooth, cellular).	android.telephony.* (TelephonyManager, SmsManager), android.net.wifi.WifiManager, android.bluetooth.* (BluetoothAdapter, BluetoothDevice), android.net.ConnectivityManager
Content Providers	APIs that allow applications to share data with each other in a structured and secure way.	android.content.ContentProvider, android.content.ContentResolver, android.net.Uri, android.provider.* (MediaStore, ContactsContract)
Security & Identity	APIs for handling security-related tasks like cryptography, secure storage, and user authentication.	java.security.* (standard Java security), javax.crypto.* (standard Java cryptography), android.security.* (KeyStore, KeyChain), androidx.biometric.* (BiometricPrompt)
Testing	Framework and APIs to facilitate various types of application testing (unit, integration, UI).	junit.*, androidx.test.* (AndroidJUnit4, ActivityScenario, Espresso, UI Automator), org.mockito.*

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