Android Development I

Front 1

What is an Activity?

Back 1

A single screen with a user interface and a container for your application as well as the code)

Front 2

What is an Intent?

Back 2

Intents are part of the message system and used to initiate actions.

Front 3

What are Intents composed of?

Back 3

Actions and data that actions operate upon.

Front 4

What needs to be done to make sure an intent is processed?

Back 4

An intent listener needs to be registered.

Front 5

What happens if more than one intent listener is registered for one intent?

Back 5

The user is presented with a chooser to select the application to process the intent.

Front 6

What happens if Android doesn't find an intent listener for the intent that was sent?

Back 6

The application crashes with a run-time error.

Front 7

What is used instead of a right-click in Android apps?

Back 7

The long press.

Front 8

What is a view?

Back 8

A rectangular UI element responsible for drawing and event handling.

Front 9

Name some View elements.

Back 9

View, ContextMenu, Menu

Front 10

What are Widgets?

Back 10

More advanced UI elements that a user can interact with, e.g. checkboxes.

Front 11

Name some examples of widgets.

Back 11

Button, Checkbox, DatePicker, Gallery, DigitalClock.

Front 12

In which package are widgets located?

Back 12

android.widgets

Front 13

What's the purpose of the AsyncTask class?

Back 13

It allows you to run multiple operations at the same time without managing separate threads.

Front 14

What are some of the built-in hardware features of Android?

Back 14

GPS, compass, proximity sensor, accelerometer, bluetooth radio, camero.

Front 15

What elements are part of the Linux Android Kernel?

Back 15

Memory Management, Process management, network stack, driver model

Front 16

Which items are part of the Android Framework?

Back 16

Android run time (Dalvik virtual machine, java libs), Open GL (graphics), WebKit (browser), SQLLite (db), Media frameworks (audio & video processing) SSL, libc

Front 17

Name some of the elements that are part of the Application Framework.

Back 17

Activity Manager, window Manager, Content Providers, View System, Package Manager, Telephony Manager, Location manager, notification manager.

Front 18

Name some of the android default apps

Back 18

Home, Contacts, Phone, Browser, etc.

Front 19

Who supports Android?

Back 19

the open handset alliance led by Google.

Front 20

What's needed for Android development?

Back 20

Android SDK, IDE such as Eclipse, Android NDK, and Android ADT.

Front 21

What is the Android ADT?

Back 21

Android Development Tools (ADT) is a plugin for the Eclipse IDE that is designed to give you a powerful, integrated environment in which to build Android applications.

Front 22

What does adb stand for?

Back 22

Android debug bridge.

Front 23

Which Android platform (version) is used the most?

Back 23

version 2.2

Front 24

Name some of the sub directories for the Android SDK.

Back 24

tools, docs, usb_drivers, temp, add-ons, and samples

Front 25

How can you test Android apps without an actual Android device?

Back 25

Using the emulator.

Front 26

What are some disadvantages of using an emulator?

Back 26

Certain hardware features such as bluetooth or GPS are not available.

Front 27

What does DDMS stand for?

Back 27

Dalvik Debug Monitor Service

Front 28

Which API Level corresponds with platform version 2.2?

Back 28

8

Front 29

Which API Level corresponds with platform version 3.0?

Back 29

11

Front 30

What does AVD stand for?

Back 30

Android Virtual Device == emulator.

Front 31

What is the Nomenclature for AVDs?

Back 31

{TARGET_Version}_{SKIN}_{SCREENSIZE}_[{OPTIONS}]

Front 32

What are the two launch configurations for Android?

Back 32

Run and debug.

Front 33

How do you structure your source code inside the src folder?

Back 33

Create multiple packages.

Front 34

What is the android.jar?

Back 34

The library file of the API level which your project in built against.

Front 35

What is located in the asset folder?

Back 35

Raw assets used in the application such as xml, video, or audio files.

Front 36

What is located in the res folder?

Back 36

Resources used by the application (e.g. Strings or images). Each resource has an id.

Front 37

What is the resource folder 'anim' for?

Back 37

For XML files that define animation.

Front 38

What is the resource folder 'color' for?

Back 38

For XML files that define colors

Front 39

What is the resource folder 'drawable' for?

Back 39

For bitmap files (e.g. png, jpg, gif, etc)

Front 40

What is the resource folder 'layout' for?

Back 40

XML files that define a user interface layout.

Front 41

What is the resource folder 'menu' for?

Back 41

XML files that represent application menus.

Front 42

Where can you find the stack trace in eclipse?

Back 42

In the DDMS perspective / LogCat pane.

Front 43

Where is the AndroidManifest.xml located?

Back 43

In the root of the project.

Front 44

which file is used in connection with ADT and eclipse?

Back 44

default.properties.

Front 45

Should you edit the default.properties by hand?

Back 45

No No.

Front 46

What's the file called in which layouts are stored?

Back 46

res/layouts/main.xml

Front 47

What is a LinearLayout?

Back 47

A layout that arranges children in a single row.

Front 48

What is a RelativeLayout?

Back 48

A layout where the positions of the children can be described in relation to each other or to the parent.

Front 49

What is a TableLayout?

Back 49

A layout that arranges its children into rows and columns.

Front 50

what are the three Android layout types?

Back 50

Linear, Relative, and TableLayout.

Front 51

What's the icon size of the different resolutions?

Back 51

ldpi: 36x36
mdpi: 48x48
hdpi: 72x72

Front 52

Which two methods do almost all Activities implement?

Back 52

onCreate and onPause.

Front 53

What are the four states of an Activity

Back 53

1. Active/running
2. Paused
3. Stopped
4. Create & resuming

Front 54

How can you install the app to the emulator from cmd line?

Back 54

adb install "Your App.apk"

Front 55

How to log to DDMS?

Back 55

import android.util.Log;
Log.d("SilentModeApp","This is a test");

Front 56

What is a dimension?

Back 56

An android resource. A number followed by a unit of measure, e.g. px, in, or sp.

Front 57

What does dp stand for (dimension) and what does it mean?

Back 57

density-independent pixels. Units relative to a 160-dots per inch screen. 1dp is one pixel on a 160-dpi screen.

Front 58

What does sp stand for (dimension) and what does it mean?

Back 58

scale-independent pixels. Dimension scaled according to the users font-size preferences. Use when specifying font sizes.

Front 59

What does pt stand for (dimension) and what does it mean?

Back 59

Points. About 1/72 inches.

Front 60

What does px stand for (dimension) and what does it mean?

Back 60

Pixels. Based on the actual pixels on the screen. Not recommended since it does not scale with different device resolutions.

Front 61

What does mm stand for (dimension) and what does it mean?

Back 61

Millimeters. Based on the size of the screen.

Front 62

What does in stand for (dimension) and what does it mean?

Back 62

Inches. Based on the physical size of the screen.

Front 63

What is an Android Style?

Back 63

A resource that is a collection or properties that can be applied to views, activities, or the application.

Front 64

What is a Theme?

Back 64

A style that is applied to an entire activity or application (rather than to a view).

Front 65

Give an example of the items that can be specified in the Values Resource.

Back 65

Bool, Integer, Integer array, typed array.

Front 66

What are Menus?

Back 66

Android resources that can be defined through xml. Each menu has an xml file.

Front 67

What is a home-screen widget?

Back 67

A miniature application that can be embedded in the home screen.

Front 68

What is an AppWidgetProvider?

Back 68

A class that lets ou interface with the add widget on the home screen.

Front 69

What is a Toast?

Back 69

A small message that is displayed to the user for a few seconds.

Front 70

What are the two types of Android click events?

Back 70

Click and long click.

Front 71

What are the three types of Menus?

Back 71

Options, Context, and Submenu.

Front 72

What is an option menu?

Back 72

A menu that can start an activity.

Front 73

What is a Context menu?

Back 73

A floating list of menu items that is presented on long-press.

Front 74

What is a Submenu?

Back 74

A floating list of menu items that a user opens by clicking on a menu item on the Options or Context menu.

Front 75

What are the four types of Application Components?

Back 75

Activities, Services, Broadcast Receivers, and Content Providers.

Front 76

How do you implement an Activity?

Back 76

By subclassing the android.Activity class.

Front 77

How do you implement a Service?

Back 77

By subclassing the android.Services class.

Front 78

How do you implement a ContentProvider?

Back 78

By subclassing the android.ContentProvider class.

Front 79

How do you implement a BroadcastReceiver?

Back 79

By subclassing the android.BroadcastReceiver class.

Front 80

Does an Android program have a main() function?

Back 80

No. It has multiple entry points. An Intent starts an activity.

Front 81

Which application components are started by Intents?

Back 81

Activities, Services, and Broadcast Receivers.

Front 82

How is a ContentProvider targeted?

Back 82

By a request from a ContentResolver.

Front 83

How do you start an Activity that doesn't require a result?

Back 83

By passing an Intent to startActivity().

Front 84

How do you start an Activity that does require a result?

Back 84

By passing an Intent to startActivityForResult().

Front 85

What are the two ways to start a service?

Back 85

1. pass an Intent to startService()
2. Bind to the service by passing an Intent to bindService()

Front 86

How do you initiate a broadcast?

Back 86

Passing an intent to methods like sendBroadcast(), sendOrderedBroadcast() or snedStickyBroadcast().

Front 87

How do you access a ContentProvider()

Back 87

By performing a query() to a ContentResolver.

Front 88

What are some of the tasks of the AndroidManifest.xml?

Back 88

1. Define application components.
2. Identify user permissions for the application
3. Declare a min. API level
4. Declare hardware and software features required (e.g. camera)
5. List API libs to link against.

Front 89

Which tag declares the Activity component in the AndroidManifest.xml?

Back 89

<activity>

Front 90

Which tag declares the Service component in the AndroidManifest.xml?

Back 90

<service>

Front 91

Which tag declares the ComponentReceiver component in the AndroidManifest.xml?

Back 91

<receiver>

Front 92

Which tag declares the ComponentProvider component in the AndroidManifest.xml?

Back 92

<provider>

Front 93

How does the system identify components that can respond to an Intent?

Back 93

By adding intent-filters to the component in the AndroidManifest.xml.

Front 94

Which algorithm is used by the system to manage activities

Back 94

last in - first out on the back stack.

Front 95

Which method is called when the system creates an activity?

Back 95

onCreate()

Front 96

Which method is called when the user leaves the activity?

Back 96

onPause()

Front 97

How do you start the SignInActivity of another application?

Back 97

Intent intent = new Intent(this, SignInActivity.class);
startActivity(intent);

Front 98

Which method shuts down an Activity?

Back 98

finish() or finishActivity().

Front 99

How do you handle different Activity states, such as Stopped, Resuming?

Back 99

by overriding the corresponding methods such as onStop() or onResume().

Front 100

How do you specify the width of a view?

Back 100

e.g. android:width="10dip"

Front 101

What are some of the Android storage options?

Back 101

Shared preferences, internal storage, local cache, external storage, SQLite database, Network connection.

Front 102

What is a shared preferences?

Back 102

Private data stored in key-value pairs.

Front 103

What is internal storage?

Back 103

A location where files can be saved on the device's internal storage.

Front 104

What is the default permission for internal storage?

Back 104

the files are private to the application.

Front 105

What is the local cache?

Back 105

An internal data directory where data is stored in a non-persistent manner.

Front 106

What is External storage?

Back 106

Location to store files, e.g. Secure Digital Card (SD Card).

Front 107

What is the default permission for external storage files?

Back 107

They are public.

Front 108

What method should be used to be the local cache directory?

Back 108

getCacheDir()

Front 109

Which method should be used to get the external files directory?

Back 109

getExternalFilesDir() on the Context object.

Front 110

where can you find icon samples?

Back 110

In the Android Template pack.

Front 111

What is the DDMS?

Back 111

Android ships with 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.

Front 112

How does the DDMS interact with the debugger?

Back 112

On Android, every application runs in its own process, each of which runs in its own virtual machine (VM). Each VM exposes a unique port that a debugger can attach to.

When DDMS starts, it connects to adb. When a device is connected, a VM monitoring service is created between adb and DDMS, which notifies DDMS when a VM on the device is started or terminated. Once a VM is running, DDMS retrieves the the VM's process ID (pid), via adb, and opens a connection to the VM's debugger, through the adb daemon (adbd) on the device. DDMS can now talk to the VM using a custom wire protocol.

DDMS assigns a debugging port to each VM on the device. Typically, DDMS assigns port 8600 for the first debuggable VM, the next on 8601, and so on. When a debugger connects to one of these ports, all traffic is forwarded to the debugger from the associated VM. You can only attach a single debugger to a single port, but DDMS can handle multiple, attached debuggers.

By default, DDMS also listens on another debugging port, the DDMS "