AND-401 시험 - Android실제시험문제와 답 - 228문항

Question No : 1

Consider the following code:
Intent i = new Intent(this, MainActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
What best explains the code above?

A.The activity being launched is already running in the current task, then instead of launching a new instance of that activity, all of the other activities on top of it will be closed and this Intent will be delivered to the (now on top) old activity as a new Intent.
B.Any existing task that would be associated with the activity to be cleared before the activity is started.
C.A new Activity will be launched and it will be on the top of the stack
D.A new activity will be launched but will be in full-screen mode.

정답:

Question No : 2

Which UI does the following code builds?
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android=http://
schemas.android.com/apk/res/android
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Name:" />
<EditText
android:id="@+id/editText1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10" />
</LinearLayout>
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Post" />
</LinearLayout>

A.An edit text to the left of a text view and a button beneath it
B.An edit text to the right of a text view and a button to the right of the text view
C.An edit text to the right of a text view and a button beneath them
D.A text view, an edit text beneath it and the button beneath the edit text

정답:

Question No : 3

Which of these is the incorrect method for an Application to save local data?

A.Extend PreferencesActivity and save in an XML file.
B.Save as a file in the local file system.
C.Save in the database using SQLite.
D.Save in the hash table file using the Dictionary class.

정답:
Explanation:
Incorrect:
B: You can save files directly on the device's internal storage.
C: Android provides full support for SQLite databases. Any databases you create will be accessible by name to any class in the application, but not outside the application.
Reference: http://developer.android.com/guide/topics/data/data-storage.html

Question No : 4

When publishing an update to your application to the market, the following must be taken into consideration:

A.The package name must be the same, but the .apk may be signed with a different private key.
B.The package name does not have to be the same and the .apk can be signed with a different private key.
C.The package name must be the same and the .apk must be signed with the same private key.
D.The package name does not have to be the same, but the .apk must be signed with the same private key.

정답:
Explanation:
You should sign all of your apps with the same certificate throughout the expected lifespan of your applications.
App upgrade: When the system is installing an update to an app, it compares the certificate(s) in the new version with those in the existing version. The system allows the update if the certificates match. If you sign the new version with a different certificate, you must assign a different package name to the application ― in this case, the user installs the new version as a completely new application.
References: http://developer.android.com/tools/publishing/app-signing.html

Question No : 5

To create a customized Adapter for a compound list item layout, you should:

A.Extend class android.widget.Adapter or any of its descendants then override method getView()
B.Extend class android.widget.ListView or any of its descendants, then override method getView()
C.Extend class android.widget.AbsAdapter or any of its descendants, then override method getView()
D.Extend class android.widget.Adapter or any of its descendants, then override method getAdapterView ().

정답:
Explanation:
The android.widget.Adapter class included the method getView(), which gets a View that displays the data at the specified position in the data set.
References: http://developer.android.com/reference/android/widget/Adapter.html

Question No : 6

To add a new Activity to your application, you need to perform the following steps:

A.Create a Java class that extends View, set a layout, and add an Activity tag in AndroidManifest.xml
B.Create layout resource only.
C.Create a Java class that extends Activity, add an Activity tag in AndroidManifest.xml, and create a layout for the activity.
D.Add an Activity tag to AndroidManifest.xml, and add ACTIVITY permission.

정답:
Explanation:
References: http://www.itcsolutions.eu/2011/08/31/android-tutorial-how-to-create-a-new-activity-class-with-manifesteditor/

Question No : 7

Method onDraw() of class android.view.View has the following signature:

A.public void onDraw(Color)
B.public void onDraw(Canvas)
C.public boolean onDraw(Canvas)
D.public Canvas onDraw()

정답:
Explanation:
The parameter to onDraw() is a Canvas object that the view can use to draw itself.
References: http://developer.android.com/training/custom-views/custom-drawing.html

Question No : 8

Which of the following is incorrect about intents?

A.They can be used to start an Activity
B.They can be used to start a service
C.They can be used to start database insertion
D.They can be used to start a dialog-themed activity.

정답:
Explanation:
Incorrect:
A, B: An intent is an abstract description of an operation to be performed. It can be used with startActivity to launch an Activity, broadcastIntent to send it to any interested BroadcastReceiver components, and startService(Intent) or bindService(Intent, ServiceConnection, int) to communicate with a background Service.
D: Example:
public static final String ACTION_BATTERY_LOW
Added in API level 1
Broadcast Action: Indicates low battery condition on the device. This broadcast corresponds to the "Low battery warning" system dialog.
References:
http://developer.android.com/reference/android/content/Intent.html

Question No : 9

Which of the following statements about DDMS is incorrect?

A.You can display a list of currently running threads and select one to check its stack trace.
B.You can use it to acquire screenshots of a terminal.
C.You can forcibly execute garbage collection and check the present heap usage status.
D.You can do simulations of network zone speed and bandwidth limitations.

정답:
Explanation:
Note: Android Studio includes a debugging tool called the Dalvik Debug Monitor Server (DDMS), which provides port-forwarding services, screen capture on the device, thread and heap information on the device, logcat, process, and radio state information, incoming call and SMS spoofing, location data spoofing, and more.
Incorrect:
A: LogCat is integrated into DDMS, and outputs the messages that you print out using the Log class along with other system messages such as stack traces when exceptions are thrown.
C: DDMS allows you to view how much heap memory a process is using. This information is useful in tracking heap usage at a certain point of time during the execution of your application.
To view heap usage for a process:

Question No : 10

When including a text file in your application to read from as a resource, what is the recommended location of such file?

A.res/anim
B.res/files
C.res/raw
D.res/values

정답:
Explanation:
You should place each type of resource in a specific subdirectory of your project's res/ directory. The raw/ subfolder should contain arbitrary files to save in their raw form.
References: http://developer.android.com/guide/topics/resources/providing-resources.html

Question No : 11

Which of the following statements is correct about SQLite?

A.It is an object database.
B.It is client-server format.
C.It is possible to create and access a database by using SQLOpenHelper.
D.It can be accessed by other applications through ContentProvider.

정답:
Explanation:
Content providers are one of the primary building blocks of Android applications, providing content to applications. They encapsulate data and provide it to applications through the single ContentResolver interface. A content provider is only required if you need to share data between multiple applications. For example, the contacts data is used by multiple applications and must be stored in a content provider. If you don't need to share data amongst multiple applications you can use a database directly via SQLiteDatabase.
References: http://stackoverflow.com/questions/13542892/android-access-sqlite-database-via-content-provider-orimplement-dao

Question No : 12

Which of the following is the correct way to add access permission to your application?

A.Add a <uses-permission> tag as a child tag of the <manifest> tag in AndroidManifest.xml
B.Add a <add-permission> tag as a child tag of the <manifest> tag in AndroidManifest.xml.
C.Add a <uses-permission> tag as a child tag of the <application> tag in AndroidManifest.xml.
D.add a <permission> tag as a child tag of the <application> tag in AndroidManifest.xml

정답:
Explanation:
If an application needs access to a feature protected by a permission, it must declare that it requires that permission with a <uses-permission> element in the manifest. Then, when the application is installed on the device, the installer determines whether or not to grant the requested permission by checking the authorities that signed the application's certificates and, in some cases, asking the user. If the permission is granted, the application is able to use the protected features. If not, its attempts to access those features will simply fail without any notification to the user.
References: http://developer.android.com/guide/topics/manifest/manifest-intro.html

Question No : 13

Which of these is the correct function of Traceview?

A.Displays a graphical task execution log.
B.Displays graphically a memory acquisition and release log
C.Displays graphically the call stack.
D.Displays graphically the Ul state hierarchy.

정답:
Explanation:
Traceview is a graphical viewer for execution logs saved by your application. Traceview can help you debug your application and profile its performance.
References: http://developer.android.com/tools/help/traceview.html

Question No : 14

Which of the following is incorrect about ProgressDialog?

A.ProgressDialog inherits from the AlertDialog class.
B.ProgressDialog can be set as 2 types of style: STYLE_HORIZONTAL and STYLE_SPINNE
C.ProgressDialog is able to apply a custom XML-defined layout by using the setContentView(...) method.
D.ProgressDialog can be freely configured to use a Drawable class to display as its progress bar.

정답:
Explanation:
Incorrect:
A: ProgressDialog extends the AlertDialog class.
B: STYLE_HORIZONTAL creates a ProgressDialog with a horizontal progress bar. STYLE_SPINNERcreates a ProgressDialog with a circular, spinning progress bar.
References: http://developer.android.com/reference/android/app/ProgressDialog.html

Question No : 15

Which of these is the correct explanation regarding the following methods?
(1)android.content.Context.sendBroadcast
(2)android.content.Context.startActivity

A.Both methods are defined by overloading.
B.Both methods throw an exception.
C.Both methods are asynchronous.
D.Both methods are able to broadcast an Intent.

정답:

Android AND-401 시험