Android FAQ

General questions:

• Recent project experience

• What technologies are used?

• What’s your responsibility

• Introduce the application you worked on

Android:

• Tell us something about ActivityCreator
  - An activityCreator is the initial step for creation of a new Android project.
  - It consists of a shell script that is used to create new file system structure required for writing codes in Android IDE. 
  

• What’s the life cycle of Activity
  

• When do you use a service?
  - Use service if you need something that is either used by other applications or outlives your application activities.

• How do you pass large objects (that can’t be passed via intents and shouldn’t be serialized) via a service?

• What do you know about Intents?
  - Notification messages to the user from an Android enabled device can be displayed using Intents. The users can respond to intents. 
  - There are two types of Intents - Explicit Intent, Implicit Intent.

• What is an Explicit Intent?
  - Explicit intent specifies the particular activity that should respond to the intent. 
  - They are used for application internal messages.
  

• What is an Implicit Intent?
  - In case of Implicit Intent, an intent is just declared. 
  - It is for the platform to find an activity that can respond to it.
  - Since the target component is not declared, it is used for activating components of other applications.

• What do intent filters do?
  - There can be more than one intents, depending on the services and activities that are going to use them. 
  - Each component needs to tell which intents they want to respond to. 
  - Intent filters filter out the intents that these components are willing to respond to.
  

• What are the different kinds of Context?
  -Activity Context
  -Application Context 
  

• Where are the lay out details placed?

• What is AIDL

• Tell me something about nine-patch image

• Which dialog boxes are supported by android
  -AlertDialog
  -ProgressDialog
  -DatePickerDialog
  -TimePickerDialog

• What are the different forms of communication provided by the android applications
  -For simple message & less data passing between processes/activities you can use intents.
  -To pass large amount of data & to expose some functionalities within processes you can use remote services(aidl)
  -To share data safely & securely within processes & activities the ideal choice would be Content provider.

• 
  

• How could you create reusable partial layout?

• What are the methods to avoid memory leak in android? And what are the steps
  -Use Activiy context only when needed i.e to access the activity's resources.
  -Use application context as much as possible, getApplicationContext(),
  -Avoid long lived references to a context e.g. storing the context in a class object

• How do you make your App UI consistent across the different screen resolutions?

• How do you persist data in Android?
  -SharedPreference, file, DB, sqlite

• How do you make asynchronous web request?
  -AJAX?
  

• How do you debug app on real devices?

• How could you invoke camera in your App?
  
  

  -Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
  -startActivityForResult(intent, 0);

• How do you do to enforce data security?
  
  

Extra:

• Any experience in PhoneGap, Html 5, CSS 3?

Others (for potential team lead):

• Any scrum experience
  

  严格的说，SCRUM是遵循敏捷方法的一个软件开发框架。在SCRUM框架中，融入敏捷开发的精神和思想，就被称作SCRUM开发方法。SCRUM是一个 什么样的开发框架呢？简单说，它由三个角色（Role），三种会议（Ceremonie），三项工件（Artifact）组成。

  角色（Role）：产品主管（Procuct Owner），他负责项目的商业价值；SCRUM师傅（ScrumMaster），他负责团队的运转和生产；以及自组织的团队。 
  会议（Ceremonie）：迭代计划会议，每日晨会（daily scrum meetings），迭代回顾会议。
  工件（Artifact）：用来排列任务的优先级和跟踪任务。待开发任务列表（product backlog），迭代任务列表（the sprint backlog），进度图（burndown chart）

  在敏捷刚出现的时候，极限编程（XP）一直是主流。但是，在敏捷方法开始在全世界流行的今天，为什么最红火的却是SCRUM？这是因为SCRUM更容易普 及和推广。其实极限编程包容了SCRUM方法。我们从工程学的角度，可以把软件开发分成两部分：过程（分解任务，排列优先级和迭代计划）和代码实现（高质 量的代码和自动化的代码保障体系）。其中最难的就是代码，最有直接商业价值的是过程。SCRUM则回避了最难的部分，加强和创新了最能直接体现商业价值的 过程部分。

  这就是SCRUM！

  
  

• Scrum process, bad side of scrum

• Any challenge in the project, how do you resolve it?