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28 Cards in this Set
- Front
- Back
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What are the Android Architecture layers? |
From top to bottom: Applications Application Framework Libraries <> Android Runtime Linux Kernel |
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What are the Linux kernel standard services? |
Device Drivers File & Network I/O Memory & Process Management Security |
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What are the Linux kernel Android specific services? |
Inter-process Communication Low Memory Killer Power Management Shared Memory |
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What does the Android run-time layer handle? |
The writing and running of Android applications. |
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What are the two main components of the Android Run-time layer? |
Core Java libraries Dalvik Virtual Machine, later Android Run-time (ART). |
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List the seven intent fields. |
Action Category Component Data Extras Flags Type |
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What action strings are passed down into intent fields? |
ACTION_DIAL ACTION_EDIT ACTION_MAIN ACTION_SYNC ACTION_VIEW |
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How would you write an intent filter in the Android manifest? |
<activity> <intent-filter> <action android:name="actionName /> </intent-filter> </activity> |
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What are the four application components? |
Activity Broadcast Receiver Content Provider Service |
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What does an activity do? |
Provides a visual interface for user interaction. Each activity typically supports one focused thing a user can do, for example viewing an email message. Applications often contain several activities. |
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How is layout of the user interface formed? |
Information about the user interface is stored as XML files, typically located in res/layout/ They can be accessed in Java as: R.layout.layout_name or in other resources as: @layout/layout_name |
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What is included in the Android manifest? |
Application Name Components Features / Required Hardware Minimum API Level Other Required Permissions |
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How are permissions represented in Android? |
They are declared as strings in the Android manifest file. |
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How would you write permissions in the Android manifest file? |
<manifest> <uses-permission android:name="android.permission.CAMERA" /> </manifest> |
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What is a view? |
It is a building block for user interface components. A view occupies a rectangular space on the screen, they are responsible for drawing elements and for handling events. |
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What is a view group? |
It is an invisible view that contains other views. They are used for grouping and organising a set of views and act as the base class for view containers & layouts. |
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What is a layout? |
It is a generic viewgroup that defines a structure for the views and / or UI elements contained inside of them. |
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What are four types of layouts? |
Grid View Linear Relative Table |
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How is a linear layout organised? |
Child views / UI elements are arranged in a single horizontal or vertical row. |
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How is a relative layout organised? |
Child views / UI elements are positioned relative to each other and to the parent view. |
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How is the table layout organised? |
Child views / UI elements are arranged into rows & columns. The table will contain as many columns as the row with the most cells. A table can leave cells empty but cannot span columns as they do in HTML. |
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How is the grid view layout organised? |
Child views / UI elements are arranged in a two-dimensional, scrollable grid. The grid items are automatically inserted into the layout using a ListAdapter. |
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How does the main UI thread work? |
The main UI thread handles quick to perform UI related tasks. If the UI thread is tasked with handling something like network access or database queries it will block the user interface. When an operation takes longer than five seconds to complete the user is presented with an ANR dialogue, "application not responding". |
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What is an Async Task? |
Async Tasks provide a structured way to manage work involving background processes. This allows the main UI thread to continue to be used while another task is performed. The async task can report it's progress whilst the UI thread will publish it. |
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What is the AsyncTask flow? |
It is the methods that are stepped through when performing an AsyncTask. They are: onPreExecute() & doInBackground (ParamType paramName) may also call: publishProgress(Progress values) |
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How are HTTP requests sent? |
Through either: HttpURLConnection (less flexible) or AndroidHttpClient (breaks transaction into separate request & response objects) |
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How are HTTP requests processed? |
Using either: JSON or XML |
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How is the request for networking permissions written in an application's Android manifest? |
<uses-permission android:name="android.permission.INTERNET" /> |
