AND-801 Practice Questions Preview

Question 1

Single choice

Which of the following methods is called in an Activity when another activity gets into the foreground?

A
onStop()
B
onPause()
C
onDestroy()
D
onExit()

Question 2

Single choice

Check the following image which includes a code that runs when the user clicks on the button (id =button).
This code for an Android app includes three check boxes for the question: "

Which countries are in North America?" Select one of the following choices, where the result will appear when the app user clicks the button.

A
in TextView widget has blank id
B
in TextView widget has id: textresult
C
in TextView widget has id: textresult.text
D
in TexView widget has id: isChecKed

Question 3

Single choice

Which of these is not defined as a process state?

A
Non-visible
B
A Visible
C
Foreground
D
Background

Question 4

Single choice

If your Android application creates a SQLite database, which of the following is the default directory to save this database file?

A
/database/SQLite_Data/APP_NAME/databases/DATABASE_FILE.
B
/database/data/APP_NAME/databases/DATABASE_FILE_SQLAPP.
C
/database/data/APP_NAME/databases/DATABASE_FILE.
D
/dataSQL/data/APP_NAME/databases/DATABASE_FILE.

Question 5

Single choice

Consider the following code snippet:

String[] result_columns = new String[]{KEY_ID, COL1, COL2};

Cursor allRows = myDatabase.query(true, DATABASE_TABLE, result_columns,

null,null,null,null,null,null);

Which of the following prints out the values of COL1 column correctly if the result is not empty?

A
if (cursor.moveToFirst()) {do {System.out.println(cursor.getString(1));}while (cursor.moveToNext()); }
B
do {System.out.println(cursor.getString(0));}while (cursor.moveToNext());
C
if (cursor.moveToFirst()) {do {System.out.println(cursor.getString(0));}while (cursor.moveToNext()); }
D
if (cursor != null) {do {System.out.println(cursor.getString(1));}while (!cursor.isNull()); }

Question 6

Single choice

Which of the following is not a valid Android resource file name?

A
mylayout.xml
B
myLayout.xml
C
my_layout.xml
D
mylayout1.xml

Question 7

Single choice

What does the following code achieve?

Intent intent = new Intent(FirstActivity.this, SecondActivity.class); startActivityForResult(intent);

A
Starts a browser activity
B
Starts a sub-activity
C
Starts an activity service
D
Sends results to another activity

Question 8

Single choice

During an Activity life-cycle, what is the first callback method invoked by the system?

A
onStop()
B
onStart()
C
onCreate()
D
onRestore()

Question 9

Single choice

Which is the correct explanation of ListView?

A
It is necessary to use ListView as a set with ListActivity.
B
You cannot use a ListView when there is no information to be displayed.
C
When displaying a list of Strings using an ArrayAdapter class in ListView, you must save the value in an ArrayList.
D
ListView has a function to display a list of uniquely defined Views other than TextView.

Question 10

Single choice

Which of the following choices is the main role of the Preview button which is illustrated in the red circle of the vertical Android Studio tool bar?

A
It shows the activity blue print preview mode.
B
It shows the Java or Kotlin code of an activity.
C
It shows the activity layout in print review.
D
It shows the activity layout in text (XML) and design mode at the same time.

Question 11

Single choice

What is the name of the folder that contains the R.java file?

A
src
B
res
C
bin
D
gen

Question 12

Single choice

Check the following image which includes a part of activity_main.xml file of an Android application.

Which of the following choices is correct about this code?

A
This code is related to Android RecycterView layout.
B
This code will give this app permission to connect to Google Gmail
C
This is a fragment layout to show the Google map.
D
This provide will give this app permission to connect to Google SQLite.

Question 13

Single choice

Which

Which of the following does NOT correctly describe interface android.widget.Adapter?

A
It is an object that acts as a bridge between a View and underlying data for that view.
B
It provides access to the data items.
C
It provides access to deprecated ListView methods.
D
It is responsible for making a View for each item in the data set.

Question 14

Single choice

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.

Question 15

Single choice

Android SDK platform is a set of libraries and APIs that provide necessary classes, methods and interfaces to develop Android applications and allow you to compile your code.

A
False
B
True

Question 16

Single choice

What are the main two types of thread in Android?

A
Main thread and worker threads.
B
Main thread and UI thread.
C
Activities and services.
D
Main thread and background process.

Question 17

Single choice

Which of the following is a Java call-back method invoked when a view is clicked?

A
Detector
B
OnTapListener
C
OnClickDetector
D
OnClickListener

Question 18

Single choice

Which of the following is NOT true about method getWindow() of class Dialog do?

A
It retrieves the current window for the activity.
B
It can be used to access parts of the Windows API.
C
It displays the dialog on the screen.
D
It returns null if the activity is not visual.

Question 19

Single choice

Check the following image which includes Android code for a sum calculator.

Which of the following choices is correct about this Android code?

A
The sum result will not appear on the app until adding another print out method.
B
The sum result of N1 and N2 will appear in result_view TextView widget when the user clicks button_sum button.
C
The sum result will not work, because N1 and N2 must be changed to Integer first.
D
You must add input method to this code to enter the value of N1 and N2 numbers.

Question 20

Multiple choice

Which of the following a Notification object must contain? (Choose three)

A
A small icon
B
A detail text.
C
A notification sound
D
A title

Question 21

Multiple choice

Which of the following is true about implicit intents? (Choose two)

A
They do not have a component specified.
B
They have components specified to run an exact class.
C
They must include information that allows Android system to choose the best component to run.
D
They must contain extra information saved in a Bundle object.

Question 22

Single choice

Which of the following lines of codes adds zoom controls to a WebView?

A
webView.getSettings().setBuiltInZoomControls(true);
B
webView.getSettings().setZoomControls(true);
C
webView.getZoomSettings().setControls(CONTROLS.enabled);
D
Zoom controls are included by default in WebViews

Question 23

Single choice

Which method should you use to start a sub-activity?

A
startActivity(Intent intent)
B
startActivityForResult(Intent intent)
C
startService(Intent intent)
D
startSubActivity(Intent intent)

Question 24

Multiple choice

Which of the following is NOT true about SQLiteOperHelper class? (Choose two)

A
It has two abstract methods: onCreate() and onUpgrade().
B
It is used to perform database querying.
C
It manages database creation and updates.
D
It manages database versions using ContentProvider.

Question 25

Single choice

Which method is used to close an activity?

A
Destroy()
B
Finish()
C
Stop()
D
Close()

Question 26

Single choice

Consider the following :

<?xml version="1.0" encoding="utf-8"?>

<menu xmlns:android="http://schemas.android.com/apk/res/android">

<item android:id="@+id/create_new"

android:title="@string/create_new" />

<item android:id="@+id/open"

android:title="@string/open" />

</menu>

public boolean onOptionsItemSelected(MenuItem item) {

switch (item.getItemId()) {

case R.id.create_new:

newFile();

return true

default:

return super.onOptionsItemSelected(item);

}
}

Upon clicking on one of the menu items, the application did not behave as intended.

Which of the following might be the cause of this problem?

A
The developer did not set onClickListener on the menu item.
B
The developer did not include a case that corresponds to the menu item in method onOptionsItemSelected.
C
The developer should create onOptionsItemSelected method for each menu item.
D
The developer should add the item to the menu resource file.

Question 27

Single choice

Consider the following AndroidManifest.xml file:

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.mkyong.android"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk android:minSdkVersion="10" />

<uses-permission android:name="android.permission.WebActivity " />

<application

android:icon="@drawable/ic_launcher"

android:label="@string/app_name" >

<activity

android:name=".WebViewActivity"

android:theme="@android:style/Theme.NoTitleBar" >

<intent-filter >

<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" /> </intent-filter>

</activity>

</application>

</manifest>

Supposing the application connects to the internet at startup, which of the following is true?

A
The application throws an exception indicating it does not have permission to access the URL.
B
The application will work as intended.
C
The application won't compile.
D
The application throws a java.lang.SecurityException.