Android Development: Using CursorWrapper for Dynamic Column Name Translation

Learn how to use CursorWrapper in Android development to dynamically translate column names when a dependent library expects undefined column names in the API. This technique can be useful for handling shared storage media content and loading thumbnails in mobile apps.

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Questions and Answers

What should you use if a dependent library within your app expects an undefined column name in the API?

CursorWrapper

How can you load a thumbnail of a specific media item with size settings?

getApplicationContext().getContentResolver().loadThumbnail(content-uri, new Size(640, 480), null)

How can you 'open' a media file as a file descriptor?

resolver.openFileDescriptor(content-uri, 'r')

What method can be used to perform operations on the opened file descriptor?

Perform operations directly on the ParcelFileDescriptor Signup and view all the answers

What action does an app invoke to interact with document providers using Storage Access Framework (SAF)?

ACTION_OPEN_DOCUMENT Signup and view all the answers

Which use case is supported by Storage Access Framework (SAF)?

Creating new files Signup and view all the answers

What is the purpose of the system picker in Storage Access Framework (SAF)?

To choose the location of a document provider Signup and view all the answers

In which version of Android was Storage Access Framework (SAF) introduced?

Android 4.4 (API level 19) Signup and view all the answers

What does the @Query annotation allow developers to do?

Write custom SQL queries for insertion, update, and deletion Signup and view all the answers

What does the Select query in the given context return?

All columns in the user table Signup and view all the answers

What do developers need to do to only retrieve relevant data from a table?

Maintain a good habit of only retrieving relevant data Signup and view all the answers

What does the NameTuple class do?

Hold relevant data from the user table Signup and view all the answers

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Android Development: Using CursorWrapper for Dynamic Column Name Translation

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