Self-Review Exercises

8.1 Fill in the blanks in each of the following statements:

a) SQLite database query results are managed via a(n) __________ (package android.database).

b) To get a database operation’s results in the GUI thread, you use a(n) __________ (package android.os) to perform the operation in one thread and receive the results in the GUI thread.

c) Fragment method __________ returns the Bundle of arguments to the Fragment.

d) The Cursor returned by method query contains all the table rows that match the method’s arguments—the so-called __________.

8.2 State whether each of the following is true or false. If false, explain why.

a) It’s good practice to release resources like database connections when they are not being used so that other activities can use the resources.

b) It’s considered good practice to ensure that Cursor method moveToFirst returns false before attempting to get data from the Cursor.

c) It’s good practice to perform long-running operations or operations that block execution until they complete (e.g., file and database access) in the GUI thread.

d) SimpleCursorAdapter is a subclass of CursorAdapter that’s designed to simplify mapping Cursor columns directly to TextViews or ImagesViews defined in your XML layouts.

e) A key benefit of using an SyncTask is that it handles the details of creating threads and executing its methods on the appropriate threads for you, so that you do not have to interact with the threading mechanism directly.