android_bulid_apk.txt

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1.source structure
	源/根目录的结构组成
	AndroidManifest.xml 程序配置
	Android.mk 			编译配置
	assets				不压缩的资源
	CleanSpec.mk
	extensions_src
	libs 				程序需要的库
	MODULE_LICENSE_APACHE2
	NOTICE
	proguard.flags
	project.properties
	res 				文本、图片等等
	src 				源代码文件

2.build overview
	andorid project ---> 编译和打包 ---> apk文件 ---> signing ---> 通过ADB进入实际设备或者模拟器
	apk包里包括的：.dex, resource.arsc, androidmainfest.xml，可能会有一些未编译的resources
	
3.build tools
	aapt：
	android asset packaging tool, take resources and Androidmanifest.xml and compile them, provide
	R.java.
	
	aidl：converts any .aidl interfaces that you have into Java interfaces, output .java
	
	javac：compile java code, output .class
	
	dx：converts the .class files to Dalvik byte code
	
	apkbuilder：package non-compiled resources (images), compiled resources, and the .dex files into an .apk file
	
	jarsigner：sign the apk with a debug or release key
	
	zipalign：Aligning the final .apk decreases memory usage
	
	proguard：
	optimizes, and obfuscates your code by removing unused code and renaming classes, fields, and
	methods with semantically obscure names
	
	dex-preopt：input the .jar or .apk, output .odex
	
	dexopt：optimize dex with byte-swapped and struct-aligned
	
	zip/unzip：compress and uncompress tool
	
	jar：java package tool
	
4.build flow
	简单介绍一下一个apk从配置编译到组合建立生成的过程
	以calender这个apk为例：
	
	packages/apps/Calendar/Android.mk：
		修改calendar目录下的android.mk文件
		
	$ mmm packages/apps/Calendar：
		编译android.mk
		if条件判断加上的 -f 判断该目录下是否存在该文件
		
		notice_file.mk	clear_vars.mk
			|
		base_rules.mk	droiddoc.mk
			|
		java.mk  <-------
						|  	
		package.mk --->	package_internal.mk
			^
			|
		(inlcude$(build_xxx))
		Andorid.mk: source files/binary files
	
	build/core/config.mk
		build_package:=$(build_system)/package.mk
		
	
	build/core/package_internal.mk
		LOCAL_MODULE := $(LOCAL_PACKAGE_NAME)
	LOCAL_PACKAGE_NAME:=Calendar
	
4.build dependence
	
	
	
	
	
	
	
	
	
	
	
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5.build
	base_rules.mk
	
	build/core/package_internal.mk
	
	$(built_dex)build/core/java.mk
	
	$(full_classes_proguard_jar) build/core/java.mk
	
	all_assets
	
	# build/core/android_manifest.mk
	
*6.summary
	1.R.java $(create-resource-java-files)
	2.$(transform-java-to-classed.jar)
	3.$(transform-classes.jar-to-dex)
	4.$(transfomrm-dex-to-proguard)
	5.$(create-empty-package)
	6.$(add-asset-to-package); $(add-jni-shared-libs-to-package); $(add-dex-to-package); $(add-java-resources-to-package)
	7.$(sign-package)
	8.$(dexpreopt-one-file); $(dexpreopt-remove-classes.dex)
	9.$(align-package)
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