What Is Key Align In Android App Sign

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NAME

          zipalign - ZIP/APK alignment tool for Android application files        

SYNOPSIS

          To align infile.zip and save it as outfile.zip:          zipalign          [-f] [-p] [-v] [-z]          align          infile.zip          outfile.zip          To confirm the alignment of existing.zip:          zipalign          -c [-v]          align          existing.zip          The          align          is an integer that defines the byte-alignment boundaries.  This must always be 4        (which provides 32-bit alignment) or else it effectively does nothing.        

DESCRIPTION

          zipalign is an archive alignment tool that  provides  important  optimization  to  Android        application (.apk) files.  The purpose is to ensure that all uncompressed data starts with        a particular alignment relative to the start of the file.   Specifically,  it  causes  all        uncompressed  data  within  the .apk, such as images or raw files, to be aligned on 4-byte        boundaries.  This allows all portions to be accessed directly with  mmap()  even  if  they        contain binary data with alignment restrictions.  The benefit is a reduction in the amount        of RAM consumed when running the application.         This tool should always be used  to  align  your  .apk  file  before  distributing  it  to        end-users.  The Android build tools can handle this for you.  Android Studio automatically        aligns your .apk after it signs it with your private key.  The  build  scripts  used  when        compiling  your application with Gradle also align your .apk, as long as you have provided        the path to your keystore and the key alias in your  project  gradle.properties  file,  so        that the build tools can sign the package first.         Caution:  zipalign  must  only  be performed after the .apk file has been signed with your        private key.  If you perform zipalign before signing, then the signing procedure will undo        the  alignment.  Also, do not make alterations to the aligned package.  Alterations to the        archive, such as renaming or deleting entries, will potentially disrupt the  alignment  of        the  modified  entry  and  all later entries.  And any files added to an "aligned" archive        will not be aligned.         The adjustment is made by altering the size of the "extra" field in  the  zip  Local  File        Header sections.  Existing data in the "extra" fields may be altered by this process.         For more information about how to use zipalign when building your application, please read        "Signing                                Your                                 Application":        https://developer.android.com/tools/publishing/app-signing.html        

OPTIONS

          -c          Check alignment only (does not modify file)          -f          Overwrite existing          outfile.zip          -p          Page align stored shared object files          -v          Verbose output          -z          Recompress using Zopfli        

SEE ALSO

          ziptime(1)         https://developer.android.com/studio/command-line/zipalign.html        

AUTHORS

          The Android Open Source Project.                                            22 August 2016                              ZIPALIGN(1)        

What Is Key Align In Android App Sign

Source: http://manpages.ubuntu.com/manpages/bionic/man1/zipalign.1.html

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