android 源码编译相关

1 在ubuntu中编译android6.0时需要openjdk7, 但是openjdk-7-jdk 和openjdk-7-jre需要同时安装。

 $sudo apt-get install openjdk-7-jre

 $sudo apt-get install openjdk-7-jdk

PS: openjdk-7-jre包只包含Java运行时环境（Java Runtime Environment）。如果是要开发Java应用程

序，则需要安装openjdk-7-jdk包。

2 在ubuntu中更新jdk链接

Installing Oracle JDK 8 on Ubuntu:

Extract the tar file:

tar -xvzf jdk-8-linux-x64.tar.gz

Create jvm folder in /usr/lib, if jvm folder not exist

sudo mkdir /usr/lib/jvm

Move extracted jdk 8 folder to this location:

sudo mv jdk1.8.0 /usr/lib/jvm/jdk1.8.0

Install new java source in system:

sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.8.0/bin/javac 1
sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.8.0/bin/java 1
sudo update-alternatives --install /usr/bin/javaws javaws /usr/lib/jvm/jdk1.8.0/bin/javaws 1

Choose default java:

sudo update-alternatives --config javac
sudo update-alternatives --config java
sudo update-alternatives --config javaws

Java version test:

java -version

参考链接 http://www.devsniper.com/install-jdk-8-on-ubuntu/

3 android N 编译

1）编译错误

Java heap spaceTry increasing heap size with java option '-Xmx<size>'Warning: This may have produced partial or corrupted output.ninja: build stopped: subcommand failed.build/core/ninja.mk:146: recipe for target 'ninja_wrapper' failed
make: *** [ninja_wrapper] Error 1

解决方案： 在文件 out/host/linux-x86/bin/jack-admin 添加 值

export JACK_SERVER_VM_ARGUMENTS="-Dfile.encoding=UTF-8 -XX:+TieredCompilation "
然后重启
out/host/linux-x86/bin/jack-admin kill-server
out/host/linux-x86/bin/jack-admin start-server

5 编译andorid orea,内存不够：
解决方案：
The problem is that virtual machine which runs jack doesn't have enough memory.
You can try to edit jvm command:JACK_VM_COMMAND=${JACK_VM_COMMAND:="java -Xmx4096m"}
or to decrease number of parallel jack compilationsSERVER_NB_COMPILE=2
in  file.
You can read jack documentation for details.EDIT:
Changing .jack file didn't work for me.
After digging a little deeper I found that jack server is started with 
out/host/linux-x86/bin/jack-admin script and it's parameters can be 
passed with JACK_SERVER_VM_ARGUMENTS environment variable.So my solution was 
to set it and restart jack server before building aosp 
:

      6在android８orea, cts中添加第三方jar包：LOCAL_STATIC_JAVA_LIBRARIES :=poi（在compatibility-host-util andorid.mk 文件中）

make cts时，出现错误： 

ninja: error: '/media/camille/android_src/out/androidOrea/host/common/obj/JAVA_LIBRARIES/poi_intermediates/classes.jar', needed by '/media/camille/android_src/out/androidOrea/host/common/obj/JAVA_LIBRARIES/compatibility-host-util_intermediates/classes-full-debug.jar', missing and no known rule to make it

15:00:20 ninja failed with: exit status 1

build/core/main.mk:21: recipe for target 'run_soong_ui' failed

make: *** [run_soong_ui] Error 1

说明编译package compatibility-host-util　需要poi_intermediates下的文件classes.jar。

解决方法：　复制一份poi_intermediates下的文件javalib.jar, rename to classes.jar。再次编译，就可以了。