Android Tutorials - Herong's Tutorial Examples

∟Build Process and Package File Content

∟"zipalign" Command - Aligning File Locations in .apk Package

This section describes the 'zipalign' tool for aligning file locations in an .apk package (really a .zip file) to decreases memory usage when running the application.

The last tool used in the "ant -verbose debug" command is the "zipalign" tool, which optimize the .apk package file by aligning file locations in the .apk package to decreases memory usage when running the application.

Looking at the output of "ant -verbose debug", I have created this "zipalign" command to perform the package optimization step of the build process. This is how the command works on the HelloAndroid project: 

C:\herong\\HelloAndroid>
   \local\android-sdk-windows\build-tools\22.0.1\zipalign
   -f -v 4 .\bin\HelloAndroid-debug-unaligned.apk
   .\bin\HelloAndroid-debug.apk

Verifying alignment of .\bin\HelloAndroid-debug.apk (4)...
      53 res/layout/main.xml (OK - compressed)
     766 AndroidManifest.xml (OK - compressed)
    1352 resources.arsc (OK)
    2824 res/drawable-hdpi/ic_launcher.png (OK)
    6856 res/drawable-ldpi/ic_launcher.png (OK)
    8456 res/drawable-mdpi/ic_launcher.png (OK)
   10697 classes.dex (OK - compressed)
   12241 META-INF/MANIFEST.MF (OK - compressed)
   12671 META-INF/CERT.SF (OK - compressed)
   13136 META-INF/CERT.RSA (OK - compressed)
Verification successful

Okay. The "zipalign" command worked. There are 10 files in the .apk package file: .\bin\HelloAndroid-debug.apk.

Table of Contents

 About This Book

 Installing JDK 1.8 on Windows System

 Installation of Android SDK R24 and Emulator

 Installing Apache Ant 1.9 on Windows System

 Developing First Android Application - HelloAndroid

 Android Application Package (APK) Files

 Android Debug Bridge (adb) Tool

 Android File Systems

 AboutAndroid - Application to Retrieve System Information

 android.app.Activity Class and Activity Lifecycle

 View Objects and Layout Resource Files

 Using "adb logcat" Command for Debugging

►Build Process and Package File Content

 "android create project" Command Options

 Android Project Folder Structure

 Android Application Project Build Process

 Project Build Process Done by "ant debug" Command

 Detailed Output of "ant -verbose debug" Command

 Output of "ant -verbose debug" - Android SDK R17

 "aapt" - Android Asset Packaging Tool

 "aapt package" Command - Resource Code Generation

 "javac" - Java Compilation Command

 "dx.bat --dex" Command - Converting .class Files into .dex File

 "apkbuilder" Command - Packaging and Signing .apk File

►"zipalign" Command - Aligning File Locations in .apk Package

 "aapt dump" Command - Printing Contents of .apk Package

 META-INF Files - Digests, Signature and Certificate

 Building Your Own Web Browser

 Android Command Line Shell

 Samsung Galaxy Tab 3 Mini Tablet

 USB Debugging Applications on Samsung Tablet

 Android Tablet - LG-V905R

 USB Debugging Applications on LG-V905R Tablet

 Android Phone - LG-P925g

 USB Debugging Applications on LG-P925g Phone

 Archived Tutorials

 References

 Full Version in PDF/EPUB