Android structure
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The document summarizes the different resource types used in an Android application. Resources like animations, colors, drawables, layouts, menus and strings are stored in the res folder and accessed via their respective R classes. The src folder contains Java source code, gen contains the R class, assets stores raw files, and bins has compiled code. Resources support different densities in drawable folders. Layouts define UIs and values contains simple data like strings.
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Android structure
- 1. Resource Types Resources found in /res folder Here's a brief summary of each resource type: Animation ResourcesDefine pre- determined animations.
- 2. Color State List ResourceDefine a color resources that changes based on the View state. Saved in res/color/ and accessed from the R.color
- 3. class. Drawable ResourcesDefine various graphics with bitmaps or XML. Saved in res/drawable/ and accessed from the R.drawable
- 4. class.Layout ResourceDefine the layout for your application UI. Saved in res/layout/ and accessed from the R.layout
- 5. class.Menu ResourceDefine the contents of your application menus. Saved in res/menu/ and accessed from the R.menu class. String ResourcesDefine strings, string arrays, and plurals (and include string formatting and styling). Saved in res/values/ and accessed from the R.string, R.array,
- 6. /src The src folder contains the application’s source code in the form of Java files and is organized into different packages depending on its functionality. /GEN Gen folder contains files that are automatically created by the ADT.It contains R.java that was automatically generated.R.java contains references to all the resources that we have created in the res folder of the android project.
- 7. For every resources that is added to the android project the ADT tool regenerates the R.java file in order to hold a reference to the newly added resource. We should not manually edit the contents of R.java file as the application might not compile.
- 8. /android <version number> Android folder indicates the target library of the Android Application.The version number of the Android will be similar to the build target version that was chosen when creating the project .android.jar file contains the required libraries to execute our android program.
- 9. /assets Assets folder is used to store any raw data files such as audio ,images etc.AssetManager in android is used to access the data in this folder.DATA stored in this folder cannot be referenced using an ID. /bin bin folder contains the compiled version of the android application files.This folder contains the class files which is a compiled version of .java files,dex files which is a compiled version from java .class files.apk files which is an android executable file and its respective archives.
- 10. /res Res folder contains external resources used inan Android application.External resources could be images ,layout XML files ,audio files etc.
- 11. SUBFOLDERS /res/drawable Drawable folder contains the bitmap files that are used by the Android Application.There are three different folders in the project hierarchy to store these files .They are Drawable-ldpi ldpi stands for low density pixel resolution Drawable-hdpi Hdpi stands for high density pixel resolution
- 12. This folder contains images that can be used for specific screen configurations.Android device chooses images from one of the folders depending on its screen resolution. /res/layout Layout folder stores XML files that are configured with the user interface components of all activities in an android application.
- 13. /res/layout Layout stores XML files that are configured with the user interface components of all activities in an android application. /res/values Values contains XML files that define simple values like Strings,arrays,styles,colors etc. /res/menu Menu folder contains XML files that hold menu details of the android applications.
- 14. values is meant for devices below API 11 values-v11 is meant for devices with API between 11 and 13 values-v14 is is meant for devices above API 13
- 15. The resource.ap_ is all the resources for you file zipped up. Everything from the res, assets folders and the Manifest file. The apk file added in the class.dex (all your compiled code) and any linked .so (native code). Both of these files are in .zip format. They can easily be view by changing the extension to .zip and opening them.