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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?


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