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1. In our TeaViewModel class, that extends ViewModel, we have such prorerty:

val tea: LiveData<Tea>

An observer in our Activity (type of mViewModel variable in example is TeaViewModel) is set in this way:

mViewModel!!.tea.observe(this, Observer { tea: Tea? -> displayTea(tea) })

What will be a correct displayTea method definition?

private fun displayTea()

private fun displayTea(tea: Tea?)

private fun displayTea(tea: LiveData?<Tea>)

private fun displayTea(tea: LiveData?<T>)

2. What is the incorrect statement about Data Access Object (androidx.room.Dao)?

Data Access Objects are the main classes where you define your database interactions. They can include a variety of query methods.

The class marked with @Dao should either be an interface or an abstract class. At compile time, Room will generate an implementation of this class when it is referenced by a Database.

An abstract @Dao class can optionally have a constructor that takes a Database as its only parameter.

It is recommended to have only one Dao class in your codebase for all tables.

3. About running a debuggable build variant. Usually, you can just select the default "debug" variant that's included in every Android Studio project (even though it's not visible in the build.gradle file). But if you define new build types that should be debuggable, you must add ‘debuggable true’ to the build type.

Is that mostly true?

Yes.

No, if you define new build types that should be debuggable, you must add ‘debuggable false’

No, the debug variant should be visible in the build.gradle file anyway.

4. In general, you should send an AccessibilityEvent whenever the content of your custom view changes. For example, if you are implementing a custom slider bar that allows a user to select a numeric value by pressing the left or right arrows, your custom view should emit an event of type TYPE_VIEW_TEXT_CHANGED whenever the slider value changes.

Which one of the following sample codes demonstrates the use of the sendAccessibilityEvent() method to report this event.

override fun dispatchPopulateAccessibilityEvent(event: AccessibilityEvent): Boolean { return super.dispatchPopulateAccessibilityEvent(event).let { completed -> if (text?.isNotEmpty() == true) { event.text.add(text) true } else { completed } } }

override fun onKeyUp(keyCode: Int, event: KeyEvent): Boolean { return when(keyCode) { KeyEvent.KEYCODE_DPAD_LEFT -> { currentValue-- sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED) true } ... } }

override fun onKeyUp(keyCode: Int, event: KeyEvent): Boolean { return when(keyCode) { KeyEvent.KEYCODE_ENTER -> { currentValue-- sendAccessibilityEvent (AccessibilityEvent.TYPE_VIEW_CONTEXT_CLICKED) true } ... } }

5. The Testing Pyramid, shown in the Figure, illustrates how your app should include the three categories of tests: small, medium, and large. Small tests are unit tests that:

validate your app's behavior one class at a time.

validate either interactions between levels of the stack within a module, or interactions between related modules.

validate user journeys spanning multiple modules of your app.

6. For example, we have a file in our assets folder app/src/main/assets/sample_teas.json.

To get an InputStream for reading it, from out Context context, we can try do this:

val input = context!!.resources.openRawResource(

raw.sample_teas)

val input = context!!.assets.open("sample_teas.json")

val input = context!!.resources.assets.open("sample_teas.json")

7. For example, our preferences.xml file was added by addPreferencesFromResource (R.xml.preferences).

Our preferences.xml file contains such item:

<ListPreference android:id="@+id/order_by" android:key="@string/pref_sort_key"

android:title="@string/pref_sort_title" android:summary="@string/pref_sort_summary"

android:dialogTitle="@string/pref_sort_dialog_title" android:entries="@array/sort_oder"

android:entryValues="@array/sort_oder_value"

android:defaultValue="@string/pref_default_sort_value" app:iconSpaceReserved="false" />

In our Fragment, we can dynamically get current notification preference value in this way:

val sortBy = PreferenceManager.getDefaultSharedPreferences(context).getString( context!!.getString(

string.pref_sort_key), context!!.resources.getBoolean(

bool.pref_default_sort_value) )

val sortBy = PreferenceManager.getSharedPreferences(context).getString( context!!.getString(

string.pref_default_sort_value), context!!.getString(

string.pref_sort_key), )

val sortBy = PreferenceManager.getSharedPreferences(context).getBoolean( context!!.resources.getBoolean(

bool.pref_default_sort_value), context!!.getString(

string.pref_sort_key) )

val sortBy = PreferenceManager.getDefaultSharedPreferences(context).getString( context!!.getString(

string.pref_sort_key), context!!.getString(

string.pref_default_sort_value) )

8. To automate UI tests with Android Studio, you implement your test code in a separate Android test folder. Folder could be named:

app/androidTest/java

app/src/androidTest/java

app/java/androidTest

9. The Log class allows you to create log messages that appear in logcat. Generally, you could use the following log methods: (Choose five.)

Log.e(String, String) (error)

Log.a(String, String) (all outputs)

Log.w(String, String) (warning)

Log.i(String, String) (information)

Log.q(String, String) (questions)

Log.d(String, String) (debug)

Log.v(String, String) (verbose)

10. Once your test has obtained a UiObject object, you can call the methods in the UiObject class to perform user interactions on the UI component represented by that object.

You can specify such actions as: (Choose four.)

click() : Clicks the center of the visible bounds of the UI element.

touch() : Touch the center of the visible bounds of the UI element.

dragTo() : Drags this object to arbitrary coordinates.

moveTo() : Move this object to arbitrary coordinates.

setText() : Sets the text in an editable field, after clearing the field's content. Conversely, the clearTextField() method clears the existing text in an editable field.

swipeUp() : Performs the swipe up action on the UiObject. Similarly, the swipeDown(), swipeLeft(), and swipeRight() methods perform corresponding actions.

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11. Filter logcat messages.

If in the filter menu, a filter option “Show only selected application”? means:

Display the messages produced by the app code only (the default). Logcat filters the log messages using the PID of the active app.

Apply no filters. Logcat displays all log messages from the device, regardless of which process you selected.

Create or modify a custom filter. For example, you could create a filter to view log messages from two apps at the same time.

12. As an example. In an Activity we have our TimerViewModel object (extended ViewModel), named mTimerViewModel. mTimerViewModel.timer method returns a LiveData<Long> value.

What can be a correct way to set an observer to change UI in case if data was changed?

mTimerViewModel!!.timer.value.toString().observe (Observer { aLong -> callAnyChangeUIMethodHere(aLong!!) })

mTimerViewModel!!.timer.observe (this, Observer { aLong -> callAnyChangeUIMethodHere(aLong!!) })

mTimerViewModel.observe (Observer { aLong -> callAnyChangeUIMethodHere(aLong!!) })

13. What is illustrated in the picture?

Logcat window with filter settings

Debugging native code using LLDB

The Variables and Watches panes in the Debugger window

The Breakpoints window lists all the current breakpoints and includes behavior settings for each

Adding a watchpoint to a variable in memory

14. What is demonstrated by the code below?

// RawDao.kt

@Dao

interface RawDao { @RawQuery

fun getUserViaQuery(query: SupportSQLiteQuery?): User?

}

// Usage of RawDao

...

val query =

SimpleSQLiteQuery("SELECT * FROM User WHERE id = ? LIMIT 1",

arrayOf<Any>(sortBy))

val user = rawDao.getUserViaQuery(query)

...

A method in a Dao annotated class as a raw query method where you can pass the query as a SupportSQLiteQuery.

A method in a Dao annotated class as a query method.

A method in a RoomDatabase class as a query method.

15. If you want to access a specific UI component in an app, use the UiSelector class. This class represents a query for specific elements in the currently displayed UI.

What is correct about it? (Choose two.)

If more than one matching element is found, the first matching element in the layout hierarchy is returned as the target UiObject.

If no matching UI element is found, an IOException is thrown.

If more than one matching element is found, the last matching element in the layout hierarchy is returned as the target UiObject.

If no matching UI element is found, a UiAutomatorObjectNotFoundException is thrown.

16. What statements about InputStreamReader (java.io.InputStreamReader) are correct? (Choose two.)

An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and decodes them into characters using a specified charset. The charset that it uses may be specified by name or may be given explicitly, or the platform's default charset may be accepted.

An InputStreamReader is a bridge from character streams to byte streams: It reads characters using a specified charset and encodes them into bytes. The charset that it uses may be specified by name or may be given explicitly, or the platform's default charset may be accepted.

Each invocation of one of an InputStreamReader's read() methods may cause one or more bytes to be read from the underlying byte-input stream. To enable the efficient conversion of bytes to characters, more bytes may be read ahead from the underlying stream than are necessary to satisfy the current read operation.

No any invocation of one of an InputStreamReader's read() methods can cause some bytes to be read from the underlying byte-input stream.

17. In a class PreferenceFragmentCompat.

What method is called during onCreate(Bundle) to supply the preferences for this fragment. And where subclasses are expected to call setPreferenceScreen (PreferenceScreen) either directly or via helper methods such as addPreferencesFromResource (int)?

onCreateLayoutManager

onCreatePreferences

onCreateRecyclerView

onCreateView

18. When your code execution reaches the breakpoint, Android Studio pauses execution of your app. You can then use the tools in the Debugger tab to identify the state of the app.

With Step Over you can

examine the object tree for a variable; expand it in the Variables view.

evaluate an expression at the current execution point

advance to the next line in the code (without entering a method)

advance to the first line inside a method call

advance to the next line outside the current method

continue running the app normally

19. By default, the notification's text content is truncated to fit one line.

If you want your notification to be longer, for example, to create a larger text area, you can do it in this way:

var builder = NotificationCompat.Builder(this, CHANNEL_ID) .setContentText("Much longer text that cannot fit one line...") .setStyle(NotificationCompat.BigTextStyle() .bigText("Much longer text that cannot fit one line...")) ...

var builder = NotificationCompat.Builder(this, CHANNEL_ID) .setContentText("Much longer text that cannot fit one line...") .setLongText("Much longer text that cannot fit one line...")) ...

var builder = NotificationCompat.Builder(this, CHANNEL_ID) .setContentText("Much longer text that cannot fit one line...") .setTheme(android.

style.Theme_LongText); ...

20. In a class PreferenceFragmentCompat. As a convenience, this fragment implements a click listener for any preference in the current hierarchy.

So, in what overridden method we can handle that a preference in the tree rooted at this PreferenceScreen has been clicked?

onCreateLayoutManager

onCreatePreferences

onCreateRecyclerView

onPreferenceTreeClick

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21. Filter logcat messages. If in the filter menu, a filter option “Edit Filter Configuration”? means:

Display the messages produced by the app code only (the default). Logcat filters the log messages using the PID of the active app.

Apply no filters. Logcat displays all log messages from the device, regardless of which process you selected.

Create or modify a custom filter. For example, you could create a filter to view log messages from two apps at the same time.

22. To run a debuggable build variant you must use a build variant that includes

minifyEnabled false in the build configuration

debuggable true or debuggable false in the build configuration

debuggable true in the build configuration

23. When your code execution reaches the breakpoint, Android Studio pauses execution of your app. You can then use the tools in the Debugger tab to identify the state of the app.

With Step Out you can

examine the object tree for a variable; expand it in the Variables view. If the Variables view is not visible

evaluate an expression at the current execution point

advance to the next line in the code (without entering a method)

advance to the first line inside a method call

advance to the next line outside the current method

continue running the app normally

24. For example, we have a BufferedReader reader, associated with the json file through

InputStreamReader.

To get a file data we can do this:

var line: String? try { while (reader.readLine().also { line = it } != null) { builder.append(line) } val json = JSONObject(builder.toString()) return json } catch (exception: IOException) { exception.printStackTrace() } catch (exception: JSONException) { exception.printStackTrace() }

var line: JSONObject ? try { while (reader.readJSONObject ().also { line = it } != null) { builder.append(line) } val json = JSONObject(builder.toString()) return json } catch (exception: IOException) { exception.printStackTrace() } catch (exception: JSONException) { exception.printStackTrace() }

var line: String? try { while (reader.readLine().also { line = it } != null) { builder.append(line) } val json = JSONObject(builder.toString()) return json } catch (exception: RuntimeException) { exception.printStackTrace() } catch (exception: ArrayIndexOutOfBoundsException) { exception.printStackTrace() }

25. Android Tests. You can use the childSelector() method to nest multiple UiSelector instances. For example, the following code example shows how your test might specify a search to find the first ListView in the currently displayed UI, then search within that ListView to find a UI element with the text property Apps.

What is the correct sample?

val appItem: UiObject = device.findObject( UiSelector().className(ListView.class) .instance(1) .childSelector( UiSelector().text("Apps") ) )

val appItem: UiObject = device.findObject( UiSelector().className("android.widget.ListView") .instance(0) .childSelector( UiSelector().text("Apps") ) )

val appItem: UiObject = device.findObject( UiSelector().className("android.widget.ListView") .instance( UiSelector().text("Apps") ) )

26. What is a correct part of an Implicit Intent for sharing data implementation?

val sendIntent = Intent(this, UploadService::class.java).apply { putExtra(Intent.EXTRA_TEXT, textMessage) ...

val sendIntent = Intent().apply { type = Intent.ACTION_SEND; ...

val sendIntent = Intent(this, UploadService::class.java).apply { data = Uri.parse(fileUrl) ...

val sendIntent = Intent().apply { action = Intent.ACTION_SEN

27. SharedPreferences.Editor is an interface used for modifying values in a SharedPreferences object.

To mark in the editor that a preference value should be removed, which will be done in the actual preferences once commit() or apply() is called, what method in SharedPreferences.Editor should we use?

delete(String key)

clear()

remove(String key)

removeAll()

28. Each time your test invokes onView(), Espresso waits to perform the corresponding UI action or assertion until the following synchronization conditions are met: (Choose three.)

The message queue is empty.

The message queue is not empty.

There are some instances of AsyncTask currently executing a task.

There are no instances of AsyncTask currently executing a task.

Some developer-defined idling resources are not idle.

All developer-defined idling res

29. The easiest way of adding menu items (to specify the options menu for an activity) is inflating an XML file into the Menu via MenuInflater. With menu_main.xml we can do it in this way:

override fun onCreateOptionsMenu(menu: Menu): Boolean { menuInflater.inflate(

menu.menu_main, menu) return true }

override fun onOptionsItemSelected(item: MenuItem): Boolean { menuInflater.inflate(

menu.menu_main, menu) return super.onOptionsItemSelected(item) }

override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(

menu.menu_main) }

30. In a class extended PreferenceFragmentCompat.

What method is used to inflate the given XML resource and add the preference hierarchy to the current preference hierarchy?

findPreference

getPreferenceManager

addPreferencesFromResource

setPreferenceScreen

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31. For example, we have a file in our raw folder app/src/main/res/raw/sample_teas.json.

To get an InputStream for reading it, from out Context context, we can do this:

val input = context!!.openRawResource(

raw.sample_teas)

val input = context!!.getRawResource(

raw.sample_teas)

val input = context!!.resources.openRawResource(

raw.sample_teas)

32. If you want the Database Inspector to automatically update the data it presents as you interact with your running app, check the Live updates checkbox at the top of the inspector window. While live updates are enabled, what happens with the table in the inspector window?

It is still editable. You can modify data in a table by double-clicking a cell, typing a new value, and pressing Enter.

It becomes read-only and you cannot modify its values.

It becomes read-only, but you cannot see its updated values before updating the data by clicking the Refresh table button at the top of the inspector window.

33. What is illustrated in the picture?

Logcat window with filter settings

Debugging native code using LLDB

The Variables and Watches panes in the Debugger window

The Breakpoints window lists all the current breakpoints and includes behavior settings for each

Adding a watchpoint to a variable in memory

34. With our Context we can get SharedPreferences with a method, named: getSharedPreferences (String name, int mode).

What value can we transfer in a “mode”parameter?

MODE_PRIVATE or MODE_PUBLIC

combination of MODE_WORLD_READABLE and MODE_WORLD_WRITEABLE

Value is either 0 or a combination of MODE_PRIVATE, MODE_WORLD_READABLE,

MODE_WORLD_WRITEABLE, and MODE_MULTI_PROCESS

35. Run your test in one of the following ways (select possible): (Choose three.)

To run a single test, open the Project window, and then right-click a test and click Run.

To test all methods in a class, right-click a class or method in the test file and click Run.

To run all tests in a directory, right-click on the directory and select Run tests.

To run all tests in Project, open the Project window, and then right-click a test and click Run.

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