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Android application package (APK) is the package file format used by the Android operating system for distribution and installation of mobile apps and middleware. APK files are analogous to other software packages such as APPX in Microsoft Windows or Deb packages in Debian-based operating systems like Ubuntu. To make an APK file, a program for Android is first compiled, and then all of its parts are packaged into one file. An APK file contains all of that program's code (such as .dex files), resources, assets, certificates, and manifest file. As is the case with many file formats, APK files can have any name needed, provided that the file name ends in ".apk". APK files are a type of archive file, specifically in zip format packages based on the JAR file format, with .apk as the filename extension. The MIME type associated with APK files is application/vnd.android.package-archive.APK file can be installed on Android powered devices just like installing software on PC. To secure the device, there is an "Unknown Sources" setting in Settings menu which is disabled by default. It must be enabled before installing any application with APK file. Enabling this setting is not required when you are installing anything via Google Play.〔(【引用サイトリンク】title=What is an APK File and How to Install it? )〕 == Package contents == An APK file is an archive that usually contains the following files and directories: * META-INF directory:* * MANIFEST.MF: the Manifest file* * CERT.RSA: The certificate of the application.* * CERT.SF: The list of resources and SHA-1 digest of the corresponding lines in the MANIFEST.MF file; for example:
* lib: the directory containing the compiled code that is specific to a software layer of a processor, the directory is split into more directories within it:* * armeabi: compiled code for all ARM based processors only* * armeabi-v7a: compiled code for all ARMv7 and above based processors only* * arm64-v8a: compiled code for all ARMv8 arm64 and above based processors only 〔https://developer.android.com/ndk/guides/abis.html〕* * x86: compiled code for x86 processors only* * x86_64: compiled code for x86_64 processors only 〔https://developer.android.com/ndk/guides/abis.html〕* * mips: compiled code for MIPS processors only* res: the directory containing resources not compiled into resources.arsc (see below).* assets: a directory containing applications assets, which can be retrieved by AssetManager.* AndroidManifest.xml: An additional Android manifest file, describing the name, version, access rights, referenced library files for the application. This file may be in Android binary XML that can be converted into human-readable plaintext XML with tools such as (AXMLPrinter2 ), (android-apktool ), or (Androguard ).* classes.dex: The classes compiled in the dex file format understandable by the Dalvik virtual machine* resources.arsc: a file containing precompiled resources, such as binary XML for example.抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Android application package」の詳細全文を読む スポンサード リンク
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