Android Core Concepts

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Android core concepts
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Android core concepts

• Having a basic understanding of the Androids
  core concepts it will help you to make different
  topics.
• They are
• Apps and APK files
• Activities
• Fragments
• Views and view groups
• Layout XML files
• widgets
• Sensors

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Apps and APK files

• The android app is an application which is
  present in APK (Android application package).
• Thus APK file contains compiled java code, texts
  and images of Android application.

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Activities

• Thus Android Activity is a GUI component , it is
  very much complicated work in doing smart phones
  because it does not have enough space when
  compare to desktop.
• But in android app you can arrange list of
  websites , it will act as a desktop and you can
  easily view many websites .

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Fragments

• Fragments is a total user interface and it only
  takes up the part of the screen
• Fragments are mainly used in inside activities
• Fragments are typically contains views and
  viewgroups inside them
• It can be reused in different activities

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Layout XML files

• Activities , fragments and some view groups can
  use XML files to define their layout and contents
• XML files will help you to find out what GUI
  component or fragment contains , as well as
  styling of GUI

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widgets

• Widgets are implemented and packaged as an part
  of application
• Thus viewgroups, fragments ,activities and
  widgets which can live on the home screen of the
  Android Device

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Sensors

• Android devices typically have a set of sensors
  built in which you can access from Android
  applications
• For example GPS is act as a sensor in many smart
  phones
• you can get access to GPS from Android
  applications.

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Communication

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