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Questions and Answers
What is the primary purpose of using an implicit Intent?
What is the primary purpose of using an implicit Intent?
- To send data to a specific Service
- To use a functionality that doesn't exist within your app (correct)
- To launch a specific Activity within your app
- To use a functionality that exists within your app
What is the purpose of the 'Data' component in an Intent?
What is the purpose of the 'Data' component in an Intent?
- To specify the information the Action has to work with (correct)
- To specify the component that can respond to the Intent
- To specify the type of Intent
- To specify the operation to be performed
What is the correct order to create an implicit Intent?
What is the correct order to create an implicit Intent?
- Launch the Intent, set the action, set the data, create the Intent object
- Set the data, set the action, create the Intent object, launch the Intent
- Create the Intent object, set the action, set the data, launch the Intent (correct)
- Set the action, set the data, create the Intent object, launch the Intent
What is the purpose of the 'Category' component in an Intent?
What is the purpose of the 'Category' component in an Intent?
What type of Intent is used when you want to use a functionality that exists within your app?
What type of Intent is used when you want to use a functionality that exists within your app?
What is the name of the method used to add extra data to an Intent?
What is the name of the method used to add extra data to an Intent?
What is the purpose of the 'Action' component in an Intent?
What is the purpose of the 'Action' component in an Intent?
What is the name of the component that can respond to an Intent?
What is the name of the component that can respond to an Intent?
What is the purpose of the startActivity method?
What is the purpose of the startActivity method?
What is the purpose of the setData method?
What is the purpose of the setData method?
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Study Notes
Intents in Android
- An Intent is a message-passing mechanism that glues components together in Android.
- There are two kinds of Intent: implicit and explicit.
- Implicit Intent is like asking someone to buy sugar without specifying where, allowing the Android runtime to find the best component to handle the request.
- Explicit Intent is like asking someone to buy sugar from a specific store, specifying the exact component to handle the request.
Creating an Intent
- An Intent can be created using the Intent constructor and passing the action and data as arguments.
- The Intent needs to be set with an action (e.g., VIEW, DIAL, ANSWER, CALL, etc.) and data (e.g., URI, phone number, picture, etc.).
Sending Data with Intent
- Intents can carry data using the putExtra method.
- Data can be sent to another Activity using an Intent.
Intent Components
- An Intent has four components: Action, Data, Category, and Extras.
- Action is the operation to be performed (e.g., VIEW, DIAL, ANSWER, CALL, etc.).
- Data refers to the information the Action needs to work with (e.g., URI, phone number, picture, etc.).
- Category determines which components are eligible to handle the Intent.
- Extras are additional data that can be passed with the Intent.
Implicit Intent
- Implicit Intent is used to request a functionality that doesn't exist within the app.
- The Android runtime finds an application that can service the request.
- Four steps are required to use an implicit Intent:
- Create the Intent object
- Set its action
- Set its data
- Launch the Intent
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