Android UI Layouts and Database Programming

FrameLayout is designed to block out an area on the screen to display a single item, acting as a placeholder that can be filled dynamically. The distractors describe RelativeLayout (relative positioning), AbsoluteLayout (x/y coordinates), and LinearLayout (linear alignment of children), which are distinct layouts.

getRootView() returns the root of the view hierarchy. getParent() only returns the immediate parent (one level up), and getRoot() is not a standard View method. The claimed answer C is correct.

In Android, the hierarchy for RadioButton is View -> TextView -> Button -> CompoundButton -> RadioButton. Among the options, TextView is the ancestor/root widget class from which RadioButton inherits its text-rendering capabilities. Button is a direct parent, and CompoundView does not exist in the standard Android widget library.

getCheckedRadioButtonId() is the correct RadioGroup method to retrieve the ID of the checked RadioButton. getRadioButtonId() and getCheckedId() are not standard Android methods. The claimed answer B is correct.

The programmatic call cbox.setChecked(true) does not map to any of the standard built-in XML attributes provided in the incorrect options, making 'None of above' the correct choice since Android uses android:checked=true for XML state initialization.

CheckBox uses CompoundButton.OnCheckedChangeListener to detect state changes. onCheckedChangeListener is the correct listener interface name. The claimed answer B is correct.

TableLayout arranges views in rows and columns, providing a grid-like structure. LinearLayout arranges in one direction (row or column), RelativeLayout uses positional relationships, and FrameLayout stacks views. The claimed answer A is correct.

The explanation is REVERSED in the statement. android:gravity controls content positioning WITHIN a View (used by the View), while android:layout_gravity controls the View's position WITHIN its container (used by the container/Layout). The statement incorrectly swaps their usage. The claimed answer B (False) is correct.

A FrameLayout in Android is designed to display a single item or stack multiple items. When multiple children are present, its dimensions are determined by the largest child plus any padding.

By default, Android's LinearLayout is horizontally oriented and aligns its children starting from the top-left corner (Gravity.TOP | Gravity.START or left-aligned in standard LTR layouts). Distractors incorrectly claim it is only left-aligned or only top-aligned, whereas both horizontal and vertical alignment rules apply.

layout_weight allocates REMAINING (free) space proportionally. If widget A has weight 1 and widget B has weight 2, the total weight is 3. Widget A gets 1/3 of free space, widget B gets 2/3 - so B gets twice what A gets. The claimed answer B is correct.

Android stores SQLite databases in the app-specific directory /data/data//databases/. This path includes the package name to ensure each app's databases are isolated and secure. The databases directory is automatically created by the Android system for each app's private data storage.

Android security model dictates that application data, including SQLite databases, is stored in the application's private internal storage directory and is inaccessible to other apps by default.

Database queries in Android return data encapsulated in Cursor objects, which act as random-read pointers to rows within the query result set.

While SQLiteOpenHelper is the recommended way to manage database creation and versioning, you can directly call openOrCreateDatabase() method available on the Context class to create or open a database without using SQLiteOpenHelper. However, this approach lacks automatic version management and upgrade helpers.