Associate-Android-Developer 試験問題を無料オンラインアクセス

Custom views and directional controller clicks. On most devices, clicking a view using a directional controller sends (to the view currently in focus) a KeyEvent with:

• A.KEYCODE_BUTTON_START
• B.KEYCODE_CALL
• C.KEYCODE_BUTTON_SELECT
• D.KEYCODE_DPAD_CENTER

For example, our preferences.xml file was added by addPreferencesFromResource (R.xml.preferences). Our preferences.xml file contains such item:
<SwitchPreference android:id="@+id/notification" android:key="@string/pref_notification_key" android:title="@string/pref_notification_title" android:summary="@string/pref_notification_summary" android:defaultValue="@bool/pref_notification_default_value" app:iconSpaceReserved="false"/> In our Fragment, we can dynamically get current notification preference value in this way:

• A.val isNotificationOn = PreferenceManager.getSharedPreferences (context).getBoolean( context!!.resources.getBoolean(R.bool.pref_notification_default_value), context!!.getString(R.string.pref_notification_key) )
• B.val isNotificationOn = PreferenceManager.getSharedPreferences (context).getBoolean( context!!.getString(R.string.pref_notification_default_value), context!!.getString(R.string.pref_notification_key), )
• C.val isNotificationOn = PreferenceManager.getDefaultSharedPreferences (context).getBoolean( context!!.getString(R.string.pref_notification_key), context!!.resources.getBoolean(R.bool.pref_notification_default_value) )

@Query is the main annotation used in DAO classes. It allows you to perform read/write operations on a database. Each @Query method is verified at compile time, so what happens if there is a problem with the query?

• A.both compilation error and runtime failure occurs.
• B.a compilation error occurs instead of a runtime failure.
• C.a runtime error occurs instead of a compilation failure.

Move the major components of the Android platform to correct places in diagram.

正解：

Reference:
https://developer.android.com/guide/platform

By executing an allowMainThreadQueries() method to the room database builder RoomDatabase.Builder, we can:

• A.handle database first time creation
• B.disable the main thread query check for Room
• C.set the database factory
• D.handle database opening