Associate Android Developer Certification Questions and Answer (Dumps and Practice Questions)

Question : Which of the following is correct about XML layout files?


1. In order to display a Ul defined in the XML layout file "main.xml", call the setContentView method of theActivity with the parameter string "main.xml".

2. There is no distinction between implementation of the layout definition by code, or by XML layout file.

3. In an Eclipse project using the ADT plugin, the XML layout file is found in the /res/layout directory.

4. Layout information written in the XML layout file will be converted into code by the Android platform whenthe screen is displayed.

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Explanation: After you've declared your layout in XML, save the file with the .xml extension, in your Android project's res/layout/ directory, so it will properly compile




Question : The DalvikVM core libraries are a subset of which of the following?


1. Java ME

2. Java SE

3. Java EE

4. JAX-WS

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Explanation: On an Android device, the Dalvik virtual machine usually executes embedded in the Android application framework. It's also possible to run it directly, just as you would a virtual machine on your desktop system
The Dalvik VM executes files in the Dalvik Executable (.dex) format which is optimised for minimal memory footprint. The VM is register-based, and runs classes compiled by a Java language compiler that have been transformed into the .dex format by the included "dx"

Dalvik is a discontinued[1] process virtual machine (VM) in Google's Android operating system that executes applications written for Android. Dalvik is an integral part of the Android software stack in Android versions 4.4 "KitKat" and earlier, which is typically used on mobile devices such as mobile phones and tablet computers, and more recently on devices such as smart TVs and wearables. Dalvik is open-source software, originally written by Dan Bornstein.

Programs for Android are commonly written in Java and compiled to bytecode for the Java virtual machine, which is then translated to Dalvik bytecode and stored in .dex (Dalvik EXecutable) and .odex (Optimized Dalvik EXecutable) files; related terms odex and de-odex are associated with respective bytecode conversions. The compact Dalvik Executable format is designed for systems that are constrained in terms of memory and processor speed.

The successor of Dalvik is Android Runtime (ART), which uses the same bytecode and .dex files (but not .odex files), with the succession aiming at performance improvements transparent to the end users. The new runtime environment was included for the first time in Android 4.4 "KitKat" as a technology preview,[4][5] and replaced Dalvik entirely in later versions; Android 5.0 "Lollipop" is the first version in which ART is the only included runtime.




Question : Which of the following is correct about file access in the Android system?


1. Generally, files are handled as dedicated resources per each application.

2. Files created by an application can be directly accessed by any application.

3. The content of file created by application cannot be accessed by any other application.

4. You can only access a file from within an Activity.

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Explanation:

Related Questions

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Question : Which of these is the incorrect explanation of the Java Native Interface(JNI)?


1. JNI does not provide garbage collection on the native side, outside the memory resources of the Java Virtual Machine.

2. Even if native code is used with JNI, it does not necessarily mean an improvement in the application processing speed.

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4. Header files generated on the Java side are included and implemented in the native (C/C++) side source code.


Question : The following code is a part of an Activity class to create a dialog. Which is the Activity class method used to display this dialog?

01 : @Override
02 : protected Dialog onCreateDialog(int id) {
03 : return new AlertDialog.Builder(this).setMessage("message").create();
04: }



1. void createDialog();

2. void createDialogfint id);

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4. void showDialog(int id);


Question : Which of these is the correct method to persist SharedPreferences?


1. XML file

2. SQLite

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4. Java object


Question : Which of these is the incorrect explanation of the Java Native Interface(JNI)?


1. JNI does not provide garbage collection on the native side, outside the memory resources of
the Java Virtual Machine.

2. Even if native code is used with JNI, it does not necessarily mean an improvement in the
application processing speed.

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side.

4. Header files generated on the Java side are included and implemented in the native (C/C++)
side source code.


Question : Which is the correct explanation of ListView?
A. It is necessary to use ListView as a set with ListActivity.
B. There is a function in ListView which displays a message when there is no information to be displayed.
C. When displaying an array using an Adapter class in ListView, it is necessary to convert it into a Collection class.
D. ListView has a function to display a list of uniquely defined Views other than TextView.


1. It is necessary to use ListView as a set with ListActivity.

2. There is a function in ListView which displays a message when there is no information to be displayed.

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4. ListView has a function to display a list of uniquely defined Views other than TextView.



Question : Which of these Activity class methods must be overridden when creating a Menu that is displayed
when the device's Menu button is pressed?


1. onCreateContextMenu

2. onMenuOpened

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4. openOptionsMenu