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Q:

Why cannot you run standard Java bytecode on Android?

Answer

Android uses Dalvik Virtual Machine (DVM) which requires a special bytecode. We need to convert Java class files into Dalvik Executable files using an Android tool called "dx". In normal circumstances, developers will not be using this tool directly and build tools will care for the generation of DVM compatible files.

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Subject: Application Development

Q:

How to select more than one option from list in android xml file? Give an example.

Answer

Specify android id, layout height and width as depicted in the following example.


<ListView android:id="@+id/ListView01" android:layout_height="wrap_content" android:layout_width="fill_parent"></ListView>

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Subject: Application Development

Q:

Describe Android Application Architecture.

Answer

Android Application Architecture has the following components:


> Services - like Network Operation


> Intent - To perform inter-communication between activities or services


> Resource Externalization - such as strings and graphics


> Notification signaling users - light, sound, icon, notification, dialog etc.


> Content Providers - They share data between applications

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Subject: Application Development

Q:

What is the difference between a regular bitmap and a nine-patch image?

Answer

In general, a Nine-patch image allows resizing that can be used as background or other image size requirements for the target device. The Nine-patch refers to the way you can resize the image: 4 corners that are unscaled, 4 edges that are scaled in 1 axis, and the middle one that can be scaled into both axes.


 

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Subject: Application Development

Q:

What Is the Google Android SDK?

Answer

The Google Android SDK is a toolset that developers need in order to write apps on Android enabled devices. It contains a graphical interface that emulates an Android driven handheld environment, allowing them to test and debug their codes.

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Subject: Application Development

Q:

What is the importance of having an emulator within the Android environment?

Answer

The emulator lets developers “play” around an interface that acts as if it were an actual mobile device. They can write and test codes, and even debug. Emulators are a safe place for testing codes especially if it is in the early design phase.

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Subject: Application Development

Q:

What items are important in every Android project?

Answer

 These are the essential items that are present each time an Android project is created:


- AndroidManifest.xml


- build.xml


- bin/


- src/


- res/


- assets/

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Subject: Application Development

Q:

What is the proper way of setting up an Android-powered device for app development?

Answer

The following are steps to be followed prior to actual application development in an Android-powered device:


- Declare your application as “debuggable” in your Android Manifest.


- Turn on “USB Debugging” on your device.


- Set up your system to detect your device.


 

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Subject: Application Development