Android Development Fundamentals

Storing Local Data

• SQLite database is used for storing local data in Android.

AndroidManifest.xml File

• Specifies the app's required permissions and components.

Intents

• A message used to pass data between components in Android.

User Interface Management

• The Activity component manages the app's user interface and handles user interactions.

BroadcastReceiver

• The BroadcastReceiver receives and responds to broadcast messages in Android.

Layout Managers

• ViewManager is not a layout manager in Android.
• LinearLayoutManager, GridLayout and ConstraintLayout are layout managers

Activity Lifecycle

• onStop() method is called when an Activity is no longer visible to the user.

R.java File

• It generates unique resource IDs.

Background Tasks

• Service component is used for background tasks that run independently of the UI.

Android Virtual Device (AVD)

• It simulates a physical Android device for testing.

"res" Directory

• Manages app resources, such as layouts, images, and strings.

Activity

• An Activity is a user interface component in Android.

Activity Visibility

• onPause() event occurs when the activity is partially visible
• onStop() event occurs when the activity is no longer visible

Inter-Process Communication

• The ContentProvider component is used for inter-process communication.

setContentView() Method

• Sets the content view to a specific layout in an Activity

Finishing an Activity

• finish() method explicitly finishes an Activity.

Back Navigation

• onBackPressed() method is called when the user navigates back from an Activity.

onPause() Method Role

• It is called when the Activity is partially visible.

Passing Data Between Activities

• Data can be passed between two Activities using Intents.

Activity Foreground

• onResume() method is called when an Activity is brought to the foreground after being paused.

onSaveInstanceState() Method

• It saves the current state of the Activity.

Launching Implicit Intents

• An implicit Intent is launched using startActivity().

Explicit vs. Implicit Intents

• Explicit Intent specifies the component to start by class name.
• Implicit Intent specifies the action to perform.

UI Component Initialization

• onCreate() method is called to initialize the UI components in an Android Activity.

onRestart() Method

• It is called when the Activity is restarted after being stopped.

Android Service

• A background task that runs without a UI

Starting a Service

• startService() method starts a service in Android.

Stopping a Service

• Services can be stopped using stopService(), or automatically when the app is closed.

Android Service Types

• Background service is not a type of service
• Foreground service, Remote service and Intent service are valid service types

onBind() Method

• It is used to unbind a service.

Service Permissions

• <uses-permission> is needed to start a service that is declared in the manifest file.

Activity-Service Communication

• Communication between an activity and a service can occur through broadcast receivers, or the bindService() method.

Foreground Service Purpose

• Foreground services provide a persistent notification for long-running tasks.

Service Creation

• The onCreate() method is called when a service is first created in Android.

onStartCommand() Method

• Used to handle incoming intents in a service

Bound Services

• They are bound to a component using bindService().

Passing Data to a Service

• Data can be passed using intent extras.

Service Initialization

• one-time initialization is performed in onCreate().

Communicating Between Applications

• By using a bound service, other processes and applications can communicate

Sticky Service

• A sticky service automatically restarts if terminated

Remote Service

• Designed to allow inter-process communication

Registering a Broadcast Receiver

• BroadcastReceiver class is used to register receiver for receiving broadcasts

Intent in BroadcastManager

• Intents used in BroadcastManager define the operation to be performed

Sending a Broadcast

• sendBroadcast() method is used to send a broadcast using the Android BroadcastManager.

Sticky Broadcast

• A broadcast that remains active even after being sent

Registering BroadcastReceiver

• A BroadcastReceiver can be registered dynamically using the registerReceiver() method in code.

LocalBroadcastManager

• Handles broadcasts within an application's components

IntentFilter

• Specifies which broadcasts a component can receive

BroadcastReceiver in Background

• A BroadcastReceiver can receive broadcasts, depending on the type of broadcast

Non-Standard Broadcast Action

• ACTION_WIFI_CONNECT is not a standard broadcast action in Android.

setPackage() Method in IntentFilter

• It filters broadcasts based on the sender's package

Components Using Intents to Communicate

• Activities, Services, and Broadcast Receivers can use Intents to communicate.

Explicit Intent

• It specifies the component to start.

Intent Action

• Represents the type of operation to be performed.

Starting a New Activity

• A new activity is started using startActivity() with an explicit Intent.

Intent Filters

• They filter incoming Intents based on specified criteria.

Adding Data to an Intent

• setData() is used to add data to an Intent

Fragments

• Fragments promote reusability and modularity in Android development.

Fragment Lifecycle

• onDestroy() is called when a fragment is being destroyed

Passing Data to a Fragment

• Data is passed through Intent extras to a fragment

Passing Data Between Activities

• putExtra() is the method to pass data from one activity to another through Intent class configuration

Snackbar

• LENGTH_LONG determines how long the snackbar is displayed