Android学习笔记之编译系统(五)apk编译流程
apk项目是如何编译的？
总结：
我们可以通过mm showcommands命令查看编译过程。今天下载了小米的Notes，便签，没有Android.mk文件，自己加上了Androd.mk，将这个项目放在自己的电脑工程下编译。总结了一下编译过程，不当之处请指正。参考柯元旦android内核剖析。
接下来我们就按顺序看看apk编译过程中的流程。
1、首先编译项目下的资源文件，生成R.java文件。因为资源文件相对独立，不会跟java文件存在依赖，相反java文件要以来资源文件，因为我们在java文件中通过R.string.xx来引用具体某个资源。编译res资源文件，主要是aap进行编译。命令使用：
-J :指定R.java的输出目录
-M：指定AndroidManifest.xml的位置
-P：指定public_resources.xml的输出目录，这个文件记述了apk资源中属性的相关描述
-S:指定res目录的路径
-I：指定apk项目可能引用的其他资源，比如framework层下的资源。
比如短彩信中会引用framework下的资源
- chips_dir := http://www.cnblogs.com/../frameworks/ex/chips/res
- res_dirs := $(chips_dir) res
- LOCAL_RESOURCE_DIR := $(addprefix $(LOCAL_PATH)/, $(res_dirs))
chips_dir := http://www.cnblogs.com/../frameworks/ex/chips/res res_dirs := $(chips_dir) res LOCAL_RESOURCE_DIR := $(addprefix $(LOCAL_PATH)/, $(res_dirs))
- aapt package -z -m -J out/target/common/obj/APPS/MiuiNotes_intermediates/src -M packages/apps/Notes/AndroidManifest.xml -P out/target/common/obj/APPS/MiuiNotes_intermediates/public_resources.xml -S packages/apps/Notes/res
aapt package -z -m -J out/target/common/obj/APPS/MiuiNotes_intermediates/src -M packages/apps/Notes/AndroidManifest.xml -P out/target/common/obj/APPS/MiuiNotes_intermediates/public_resources.xml -S packages/apps/Notes/res
我们可以看到 -J指定了R.java的输出目录 -M，指定了AndroidManifest.xml文件的路径 -P指定了public_resource.xml的位置 -S：指定了res的编译目录。
执行完aapt命令，那么就会在相应的输出目录中存在一个R.java文件了。
2、编译aidl文件。
我们在上篇文章中展示了如何在Android.mk文件中添加aidl文件。要编译aidl文件需要aidl命令，aidl 参数 输入 输出。
3、包含java静态库，也就是jar包。
有的模块需要第三方支持，有时候第三方为了保护代码，会提供一个jar，没有源文件。编译系统定义了这部分规则。
- for f in out/target/common/obj/JAVA_LIBRARIES/android-support-v4_intermediates/javalib.jar; doif [ ! -f $f ]; then echo Missing file $f; exit 1; fi; unzip -qo $f -d /out/target/common/obj/APPS/MiuiNotes_intermediates/classes; (cd /out/target/common/obj/APPS/MiuiNotes_intermediates/classes && rm -rf META-INF); done
for f in out/target/common/obj/JAVA_LIBRARIES/android-support-v4_intermediates/javalib.jar; do if [ ! -f $f ]; then echo Missing file $f; exit 1; fi; unzip -qo $f -d /out/target/common/obj/APPS/MiuiNotes_intermediates/classes; (cd /out/target/common/obj/APPS/MiuiNotes_intermediates/classes && rm -rf META-INF); done
jar文件会被解压缩，然后拷贝解压缩后的class文件到out下对应app的src目录下。
4、编译java源文件，生成jar包。
首先将找到所有的*.java文件，将他们编译生成class文件。
-bootclasspath：指定java运行库core.jar。core.jar中包含着Dalvik虚拟机运行时所需的java库。
-classpath：指定静态库，例如core.jar、framework.jar、ext.jar等。
-d:指明class的输出路径
- javac -J-Xmx512M -target 1.5 -Xmaxerrs 9999999 -encoding UTF-8 -g -bootclasspath out/target/common/obj/JAVA_LIBRARIES/core_intermediates/classes.jar <SPAN style="FONT-FAMILY: Arial, Helvetica, sans-serif">-classpath /out/target/common/obj/JAVA_LIBRARIES/core_intermediates/classes.jar:/out/target/common/obj/JAVA_LIBRARIES/core-junit_intermediates/classes.jar:/out/target/common/obj/JAVA_LIBRARIES/ext_intermediates/classes.jar:/out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/classes.jar:/out/target/common/obj/JAVA_LIBRARIES/framework2_intermediates/classes.jar:/out/target/common/obj/JAVA_LIBRARIES/android-support-v4_intermediates/javalib.jar -extdirs "" -d /out/target/common/obj/APPS/MiuiNotes_intermediates/classes </SPAN>
javac -J-Xmx512M -target 1.5 -Xmaxerrs 9999999 -encoding UTF-8 -g -bootclasspath out/target/common/obj/JAVA_LIBRARIES/core_intermediates/classes.jar -classpath /out/target/common/obj/JAVA_LIBRARIES/core_intermediates/classes.jar:/out/target/common/obj/JAVA_LIBRARIES/core-junit_intermediates/classes.jar:/out/target/common/obj/JAVA_LIBRARIES/ext_intermediates/classes.jar:/out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/classes.jar:/out/target/common/obj/JAVA_LIBRARIES/framework2_intermediates/classes.jar:/out/target/common/obj/JAVA_LIBRARIES/android-support-v4_intermediates/javalib.jar -extdirs "" -d /out/target/common/obj/APPS/MiuiNotes_intermediates/classes
然后将这些所有的class文件打包成class.jar包，这些class文件应该就包含上一步jar包解压缩后产生的class文件。
- jar -cf /out/target/common/obj/APPS/MiuiNotes_intermediates/classes-full-debug.jar -C /out/target/common/obj/APPS/MiuiNotes_intermediates/classes .
jar -cf /out/target/common/obj/APPS/MiuiNotes_intermediates/classes-full-debug.jar -C /out/target/common/obj/APPS/MiuiNotes_intermediates/classes .
-cf:c代表创建一个新的jar包，f：指定jar包的名称。-C：指定jar包包含的文件，此处就是刚才生成的所有的class文件。
生成了class-full-debug.jar。
然后执行
- acp -fp /out/target/common/obj/APPS/MiuiNotes_intermediates/classes-full-debug.jar /out/target/common/obj/APPS/MiuiNotes_intermediates/classes-jarjar.jar
acp -fp /out/target/common/obj/APPS/MiuiNotes_intermediates/classes-full-debug.jar /out/target/common/obj/APPS/MiuiNotes_intermediates/classes-jarjar.jar
- acp -fp /out/target/common/obj/APPS/MiuiNotes_intermediates/classes-jarjar.jar /out/target/common/obj/APPS/MiuiNotes_intermediates/emma_out/lib/classes-jarjar.jar
acp -fp /out/target/common/obj/APPS/MiuiNotes_intermediates/classes-jarjar.jar /out/target/common/obj/APPS/MiuiNotes_intermediates/emma_out/lib/classes-jarjar.jar
- acp -fp /out/target/common/obj/APPS/MiuiNotes_intermediates/emma_out/lib/classes-jarjar.jar /out/target/common/obj/APPS/MiuiNotes_intermediates/classes.jar
acp -fp /out/target/common/obj/APPS/MiuiNotes_intermediates/emma_out/lib/classes-jarjar.jar /out/target/common/obj/APPS/MiuiNotes_intermediates/classes.jar
- acp -fp /out/target/common/obj/APPS/MiuiNotes_intermediates/classes.jar /out/target/common/obj/APPS/MiuiNotes_intermediates/noproguard.classes.jar
acp -fp /out/target/common/obj/APPS/MiuiNotes_intermediates/classes.jar /out/target/common/obj/APPS/MiuiNotes_intermediates/noproguard.classes.jar
复制刚才产生的classes-full-debug.jar ，生成四个文件，classes-jarjar.jar、classed-jarjar.jar、classes.jar、noproguard.classes.jar
5、将jar包转换为dex文件。
在android系统中构建了一个java虚拟机，这个虚拟机需要的是dex文件。在编译系统中我们可以使用dx工具，将jar文件转换为dex文件。
--dex：产生一个dex格式的文件
--output：指定输出路径
最后指定要转换为dex的jar文件。
- /out/host/linux-x86/bin/dx -JXms16M -JXmx2048M --dex --output=/out/target/common/obj/APPS/MiuiNotes_intermediates/noproguard.classes-with-local.dex /out/target/common/obj/APPS/MiuiNotes_intermediates/noproguard.classes.jar
/out/host/linux-x86/bin/dx -JXms16M -JXmx2048M --dex --output=/out/target/common/obj/APPS/MiuiNotes_intermediates/noproguard.classes-with-local.dex /out/target/common/obj/APPS/MiuiNotes_intermediates/noproguard.classes.jar
生成了noproguard.classes-with-local.dex文件，接下来
- acp -fp /out/target/common/obj/APPS/MiuiNotes_intermediates/noproguard.classes-with-local.dex /out/target/common/obj/APPS/MiuiNotes_intermediates/noproguard.classes.dex
acp -fp /out/target/common/obj/APPS/MiuiNotes_intermediates/noproguard.classes-with-local.dex /out/target/common/obj/APPS/MiuiNotes_intermediates/noproguard.classes.dex
复制产生一个noproguard.classes.dex文件。
6、编译资源文件生成apk包
apk包，本质上是个zip压缩文件包。将它解压缩我们可以看到这个包中文件列表如下：
- inflating: res/layout/activity_main.xml
- inflating: res/menu/main.xml
- inflating: AndroidManifest.xml
- extracting: resources.arsc
- extracting: res/drawable-hdpi/ic_launcher.png
- extracting: res/drawable-mdpi/ic_launcher.png
- extracting: res/drawable-xhdpi/ic_launcher.png
- extracting: res/drawable-xxhdpi/ic_launcher.png
- inflating: classes.dex
- inflating: META-INF/MANIFEST.MF
- inflating: META-INF/CERT.SF
- inflating: META-INF/CERT.RSA
inflating: res/layout/activity_main.xml inflating: res/menu/main.xml inflating: AndroidManifest.xml extracting: resources.arsc extracting: res/drawable-hdpi/ic_launcher.png extracting: res/drawable-mdpi/ic_launcher.png extracting: res/drawable-xhdpi/ic_launcher.png extracting: res/drawable-xxhdpi/ic_launcher.png inflating: classes.dex inflating: META-INF/MANIFEST.MF inflating: META-INF/CERT.SF inflating: META-INF/CERT.RSA
包含resource.arsc：包含了所有资源文件的id值和路径的映射关系
res目录：原封不动的复制了开发时的res目录
class.dex：java源文件达成jar包，然后dx工具将jar包转化为jar
AndroidManifest.xml：源文件的二进制文件。
编译apk时，aapt首先将资源文件等除class.dex文件之外的所有文件打包成apk文件，然后再将classes.dex文件添加到apk文件中。
aapt工具参与了编译资源文件，参与了将源文件打包成apk。编译资源时使用命令参数 -m -J，-m的含义是告诉aapt使用-J后面的路径为输出路径。在将资源文件jar包压缩成apk时，使用-F参数，后面指定输出路径。-u代表如果目标apk存在，更新包中的内容。
- aapt package -u -z -c en_US,en_US,cs_CZ,da_DK,de_AT,de_CH,de_DE,de_LI,el_GR,en_AU,en_CA,en_GB,en_NZ,en_SG,es_ES,fr_CA,fr_CH,fr_BE,fr_FR,it_CH,it_IT,ja_JP,ko_KR,nb_NO,nl_BE,nl_NL,pl_PL,pt_PT,ru_RU,sv_SE,tr_TR,zh_CN,zh_HK,zh_TW,am_ET,hi_IN,ug_CN,en_US,fr_FR,it_IT,es_ES,de_DE,nl_NL,cs_CZ,pl_PL,ja_JP,zh_TW,zh_CN,ru_RU,ko_KR,nb_NO,es_US,da_DK,el_GR,tr_TR,pt_PT,pt_BR,rm_CH,sv_SE,bg_BG,ca_ES,en_GB,fi_FI,hi_IN,hr_HR,hu_HU,in_ID,iw_IL,lt_LT,lv_LV,ro_RO,sk_SK,sl_SI,sr_RS,uk_UA,vi_VN,tl_PH,ar_EG,fa_IR,th_TH,sw_TZ,ms_MY,af_ZA,zu_ZA,am_ET,hi_IN,ug_CN,mdpi,nodpi -M packages/apps/Notes/AndroidManifest.xml -S packages/apps/Notes/res -I /out/target/common/obj/APPS/framework-res_intermediates/package-export.apk --min-sdk-version 16 --target-sdk-version 16 --product default --version-code 16 --version-name 4.1.2-eng.hlwang.20130310.122659 -F /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk
aapt package -u -z -c en_US,en_US,cs_CZ,da_DK,de_AT,de_CH,de_DE,de_LI,el_GR,en_AU,en_CA,en_GB,en_NZ,en_SG,es_ES,fr_CA,fr_CH,fr_BE,fr_FR,it_CH,it_IT,ja_JP,ko_KR,nb_NO,nl_BE,nl_NL,pl_PL,pt_PT,ru_RU,sv_SE,tr_TR,zh_CN,zh_HK,zh_TW,am_ET,hi_IN,ug_CN,en_US,fr_FR,it_IT,es_ES,de_DE,nl_NL,cs_CZ,pl_PL,ja_JP,zh_TW,zh_CN,ru_RU,ko_KR,nb_NO,es_US,da_DK,el_GR,tr_TR,pt_PT,pt_BR,rm_CH,sv_SE,bg_BG,ca_ES,en_GB,fi_FI,hi_IN,hr_HR,hu_HU,in_ID,iw_IL,lt_LT,lv_LV,ro_RO,sk_SK,sl_SI,sr_RS,uk_UA,vi_VN,tl_PH,ar_EG,fa_IR,th_TH,sw_TZ,ms_MY,af_ZA,zu_ZA,am_ET,hi_IN,ug_CN,mdpi,nodpi -M packages/apps/Notes/AndroidManifest.xml -S packages/apps/Notes/res -I /out/target/common/obj/APPS/framework-res_intermediates/package-export.apk --min-sdk-version 16 --target-sdk-version 16 --product default --version-code 16 --version-name 4.1.2-eng.hlwang.20130310.122659 -F /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk
7、将dex文件添加到apk包中。
由于apk本身就是个zip压缩包，因此将dex文件添加进去的，很容易。
- _adtp_classes_dex=/out/target/common/obj/APPS/MiuiNotes_intermediates/classes.dex; cp /out/target/common/obj/APPS/MiuiNotes_intermediates/noproguard.classes.dex $_adtp_classes_dex && /out/host/linux-x86/bin/aapt add -k /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk $_adtp_classes_dex && rm -f $_adtp_classes_dex
_adtp_classes_dex=/out/target/common/obj/APPS/MiuiNotes_intermediates/classes.dex; cp /out/target/common/obj/APPS/MiuiNotes_intermediates/noproguard.classes.dex $_adtp_classes_dex && /out/host/linux-x86/bin/aapt add -k /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk $_adtp_classes_dex && rm -f $_adtp_classes_dex
首先定义class.dex文件，然后执行cp，拷贝刚才生成的noproguard.class.dex文件到class.dex中，然后调用aapt add -k命令，将class.dex添加到package.apk中，最后删除class.dex文件。
这样在out下的相应应用的目录中就产生了一个package.apk文件了。并且这个package.apk文件包含了一个完整apk所应该有的所有内容。
有时候我们的apk中需要JNI的支持，那么我们就需要将JNI所实现的库包含到apk中。我们通过在Android.mk文件中对变量LOCAL_JNI_SHARED_LIBRARIES进行赋值。在编译apk时，我们调用了 include $（BUILD_PACKAGE），这个变量在编译系统中会加载package.mk，在这个文件中，规则了加载LOCAL_JNI_SHARED_LIBARIES变量所对应的文件。
- jni_shared_libraries := \
- $(addprefix $($(my_prefix)OUT_INTERMEDIATE_LIBRARIES)/, \
- $(addsuffix $(so_suffix), \
- $(LOCAL_JNI_SHARED_LIBRARIES)))
jni_shared_libraries := \
$(addprefix $($(my_prefix)OUT_INTERMEDIATE_LIBRARIES)/, \
$(addsuffix $(so_suffix), \
$(LOCAL_JNI_SHARED_LIBRARIES)))
这段代码会给要加载进去的库写上前缀路径，以及后缀.so。
然后在package.mk后面会判断这段代码是否为空，如果不为空，则将这个库文件拷贝到apk目录下的lib下。
java静态库在编译时不会包含到apk中，动态共享库会包含到apk中，详见：http://blog.csdn.net/hailushijie/article/details/8648665
- ifneq ($(jni_shared_libraries),)
- $(add-jni-shared-libs-to-package)
- endif
ifneq ($(jni_shared_libraries),)
$(add-jni-shared-libs-to-package)
endif
关于add-jni-shared-libs-to-package变量的定义实在编译系统初始化时在definations.mk中定义的。
- define add-jni-shared-libs-to-package
- $(hide) rm -rf $(dir $@)lib
- $(hide) mkdir -p $(dir $@)lib/$(PRIVATE_JNI_SHARED_LIBRARIES_ABI)
- $(hide) cp $(PRIVATE_JNI_SHARED_LIBRARIES) $(dir $@)lib/$(PRIVATE_JNI_SHARED_LIBRARIES_ABI)
- $(hide) (cd $(dir $@) && zip -r $(notdir $@) lib)
- $(hide) rm -rf $(dir $@)lib
- endef
define add-jni-shared-libs-to-package $(hide) rm -rf $(dir $@)lib $(hide) mkdir -p $(dir $@)lib/$(PRIVATE_JNI_SHARED_LIBRARIES_ABI) $(hide) cp $(PRIVATE_JNI_SHARED_LIBRARIES) $(dir $@)lib/$(PRIVATE_JNI_SHARED_LIBRARIES_ABI) $(hide) (cd $(dir $@) && zip -r $(notdir $@) lib) $(hide) rm -rf $(dir $@)lib endef
以源码的方式包含库文件，package/inputmethods/PinyinIME
- include $(BUILD_PACKAGE)
- MY_PATH := $(LOCAL_PATH)
- include $(MY_PATH)/jni/Android.mk
- include $(MY_PATH)/lib/Android.mk
include $(BUILD_PACKAGE) MY_PATH := $(LOCAL_PATH) include $(MY_PATH)/jni/Android.mk include $(MY_PATH)/lib/Android.mk
8、对apk文件进行签名
- mv /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk.unsigned
- java -jar /out/host/linux-x86/framework/signapk.jar build/target/product/security/testkey.x509.pem build/target/product/security/testkey.pk8 /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk.unsigned /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk.signed
- mv /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk.signed /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk
mv /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk.unsigned java -jar /out/host/linux-x86/framework/signapk.jar build/target/product/security/testkey.x509.pem build/target/product/security/testkey.pk8 /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk.unsigned /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk.signed mv /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk.signed /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk
首先将上一步中的package.apk更名为package.apk.unsigned，然后调用signapk.jar、testkey.x509.pem，testkey.pk8给更名的package.apk.unsigned签名后生成package.apk.signed。
最后在把package.apk.signed更名为package.apk。
9、使用zipalign优化apk内部存储。
为了提高apk程序的加载速度，使用zipalign对apk进行边界对齐。
- mv /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk.signed /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk
- mv /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk.unaligned
- /out/host/linux-x86/bin/zipalign -f 4 /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk.unaligned /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk.aligned
- mv /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk.aligned /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk
mv /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk.signed /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk mv /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk.unaligned /out/host/linux-x86/bin/zipalign -f 4 /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk.unaligned /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk.aligned mv /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk.aligned /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk
过程和签名基本相似。
10、dex-preopt优化。
- dalvik/tools/dex-preopt --dexopt=host/linux-x86/bin/dexopt --build-dir=/out --product-dir=target/product/generic/dex_bootjars --boot-dir=system/framework --boot-jars=core:core-junit:bouncycastle:ext:framework:framework2:android.policy:services:apache-xml --uniprocessor target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk target/product/generic/obj/APPS/MiuiNotes_intermediates/package.odex
dalvik/tools/dex-preopt --dexopt=host/linux-x86/bin/dexopt --build-dir=/out --product-dir=target/product/generic/dex_bootjars --boot-dir=system/framework --boot-jars=core:core-junit:bouncycastle:ext:framework:framework2:android.policy:services:apache-xml --uniprocessor target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk target/product/generic/obj/APPS/MiuiNotes_intermediates/package.odex
package.apk作为输入文件，将其中的dex文件输出到package.odex中。
将class.dex文件从package.apk中移除
- /out/host/linux-x86/bin/aapt remove /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk classes.dex
/out/host/linux-x86/bin/aapt remove /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk classes.dex
这样package.apk中就不再含有class.dex文件了。
怎样设置才能不进行这一步
在我们执行Android.mk时，最后一步，call $BUILD_PACKAGE时，会检查WITH_DEXPREOPT的值是否为true，然后对LOCAL_DEX_PREOPT进行赋值。
- ifneq (true,$(WITH_DEXPREOPT))
- LOCAL_DEX_PREOPT :=
- else
- ifeq (,$(TARGET_BUILD_APPS))
- ifneq (,$(LOCAL_SRC_FILES))
- ifndef LOCAL_DEX_PREOPT
- LOCAL_DEX_PREOPT := true
ifneq (true,$(WITH_DEXPREOPT)) LOCAL_DEX_PREOPT := else ifeq (,$(TARGET_BUILD_APPS)) ifneq (,$(LOCAL_SRC_FILES)) ifndef LOCAL_DEX_PREOPT LOCAL_DEX_PREOPT := true
然后在base_rules.mk中
- ifdef （true,$(LOCAL_DEX_PREOPT))
- installed_odex := $(basename $(LOCAL_INSTALLED_MODULE)).odex
- built_odex := $(basename $(LOCAL_BUILT_MODULE)).odex
- $(installed_odex) : $(built_odex) | $(ACP)
- @echo -e ${CL_CYN}"Install: $@"${CL_RST}
- $(copy-file-to-target)
- $(LOCAL_INSTALLED_MODULE) : $(installed_odex)
- endif
ifdef （true,$(LOCAL_DEX_PREOPT))
installed_odex := $(basename $(LOCAL_INSTALLED_MODULE)).odex
built_odex := $(basename $(LOCAL_BUILT_MODULE)).odex
$(installed_odex) : $(built_odex) | $(ACP)
@echo -e ${CL_CYN}"Install: $@"${CL_RST}
$(copy-file-to-target)
$(LOCAL_INSTALLED_MODULE) : $(installed_odex)
endif
这样apk在编译时就能进行dex-preopt优化了。
所以，我们可以更改WITH_DEXPREOPT的值为false，或者更改LOCAL_DEX_PREOPT的值。都ok。WITH_DEXPREOPT的值在BoardConfig.mk中定义，LOCAL_DEX_PREOPT的值在package.mk中定义。
网上有人说修改system.prop文件，增加
dalvik.vm.verify-bytecode = false不知道是否ok。 如果不进行这个步骤，那么我们的apk文件中将会包含所有的文件，包括class.dex，如果包括这步则apk内不含有class.dex文件，class.dex将会以应用名.odex文件存在。
11、odex文件
- dalvik/tools/dex-preopt --dexopt=host/linux-x86/bin/dexopt --build-dir=/out --product-dir=target/product/generic/dex_bootjars --boot-dir=system/framework --boot-jars=core:core-junit:bouncycastle:ext:framework:framework2:android.policy:services:apache-xml --uniprocessor target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk target/product/generic/obj/APPS/MiuiNotes_intermediates/package.odex
dalvik/tools/dex-preopt --dexopt=host/linux-x86/bin/dexopt --build-dir=/out --product-dir=target/product/generic/dex_bootjars --boot-dir=system/framework --boot-jars=core:core-junit:bouncycastle:ext:framework:framework2:android.policy:services:apache-xml --uniprocessor target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk target/product/generic/obj/APPS/MiuiNotes_intermediates/package.odex
odex可能为了加速apk的解析吧。
最后生成了package.odex。
- acp -fp /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.odex /out/target/product/generic/system/app/MiuiNotes.odex
acp -fp /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.odex /out/target/product/generic/system/app/MiuiNotes.odex
拷贝刚才生成的package.odex，生成MiuiNotes.odex。
12、拷贝package.apk生成目标apk
- acp -fp /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk /out/target/product/generic/system/app/MiuiNotes.apk
acp -fp /out/target/product/generic/obj/APPS/MiuiNotes_intermediates/package.apk /out/target/product/generic/system/app/MiuiNotes.apk
这样我们通过编译同时生成了MiuiNotes.apk以及MiuiNotes.odex文件。
我们的源文件class.dex包含在MiuiNotes.odex中，我们的MiuiNotes.apk中包括资源文件。
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