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What is the file that determines the basis configuration (specifically activities, services, broadcast receivers, etc.) in an Android application?

What is the file that determines the basis configuration (specifically activities, services, broadcast receivers, etc.) in an Android application?

Option 1 : APK.info
Option 2 : classes.dex
Option 3 : AndroidManifest.xml
Option 4 : resources.asrc
1. APK.info

Android Package (APK) is that the package file format employed by the Androids OS , and variety of other Android-based operating systems for distribution and installation of mobile apps, mobile games and middleware.
APK is analogous to other software packages like APPX in Microsoft Windows or a Debian package in Debian-based operating systems. to form an APK file, a program for Android is first compiled using Android Studio, then all of its parts are packaged into one container file. An APK file contains all of a program’s code (such as .dex files), resources, assets, certificates, and manifest file. As is that the case with many file formats, APK files can have any name needed, but it’s going to be required that the file name ends within the file extension for being recognized intrinsically .
The Android system allows users to manually install APK files only after they activate an “Unknown Sources” setting that permits installation from sources aside from trusted ones like Google Play. One may do so for several reasons, like to put in apps not found on the shop , or to put in an older version. Although one can downgrade an app this manner by uninstalling the remake first, doing it via Android Debug Bridge is best because it allows for keeping data.

2. classes.dex

A Dex file contains code which is ultimately executed by the Android Runtime. Every APK features a single classes.dex file, which references any classes or methods used within an app. Essentially, any Activity, Object, or Fragment used within your codebase, are going to be transformed into bytes within a Dex file which will be run as an Android app.
It are often useful to know the structure of a Dex file because of these references can take up tons of space in your application. Using many 3rd party libraries can increase your APK size by megabytes, or worse, cause the infamous 64k method size limit. And in fact , there may come each day when knowledge of Dex files helps you hunt unexpected behaviour in your app.
Dexing Process
All the Java source files in an Android project are first compiled to .class files, which contains bytecode instructions. during a traditional Java application, these instructions would be executed on the JVM. However, Android apps are executed on the Android Runtime, which uses incompatible opcodes, and thus a further Dexing step is required, where .class files are converted into one .dex file.
Because most mobile devices are severely constrained within the amount of memory, processing power, and battery life available, ART offers superior performance to the JVM. One key feature that helps achieve this is often that ART performs both Ahead-of-Time and Just-in-Time compilation. This avoids a number of the runtime overhead of JIT, while still allowing performance improvements over time as an app is profiled.
How to create a Dex file
A practical example of a Dex file makes this tons easier to know . Let’s create a minimal APK that only contains one Application class, as this enables us to know the file format without being overwhelmed by the thousands of methods that are present during a typical app.
We’ll use Hexfiend to look at our Dex enter hexadecimal, as Dex uses some unusual data types to save lots of space. We’ve hidden any null bytes, so empty spaces within the above screenshot actually represent 00.

3. AndroidManifest.xml

The AndroidManifest.xml file contains information of your package, including components of the appliance like activities, services, broadcast receivers, content providers etc.
It performs another tasks also:
• it’s responsible to guard the appliance to access any protected parts by providing the permissions.
• It also declares the android api that the appliance goes to use.
• It lists the instrumentation classes. The instrumentation classes provides profiling and other informations. These informations are removed just before the appliance is published etc.
This is the specified xml file for all the android application and located inside the basis directory.

4. resources.asrc

Application resource file employed by programs developed for Google’s Android mobile operating system; contains compiled resources during a binary format; may include images, strings, or other data employed by the program; usually included in an .APK package file.
Resource files enable developers to access resources during a standard way within the program ASCII text file . They can also be used for shielding proprietary data since the info is compiled into a binary format.
Our goal is to assist you understand what a file with a *.arsc suffix is and the way to open it.
The Android Package Resource file type, file format description, and Mac, Windows, and Linux programs listed on this page are individually researched and verified by the FileInfo team. we attempt for 100% accuracy and only publish information about file formats that we’ve tested and validated.

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