Android core concepts http://www.androidtraining-chennai.in/
Android core concepts • Having a basic understanding of the Android’s 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
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.
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 .
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
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
widgets • Widgets packaged as an part of application • Thus viewgroups, ,activities and widgets which can live on the home screen of the Android Device are implemented and fragments
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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