Android 6.0下载与编译

2016-05-05 Brian Li 更多博文 » 博客 » GitHub »

原文链接 https://bigosg.github.io/android/2016/05/05/aosp-download-and-compile.html
注：以下为加速网络访问所做的原文缓存，经过重新格式化，可能存在格式方面的问题，或偶有遗漏信息，请以原文为准。

Android 6.0已经推出，更新了许多新的特性，而最好的学习方法就是直接阅读源码。所以最先想到的是下载最新的源码包。

环境

  • 系统：OS X 10.11.4
  • git : 2.6.4
  • make : 3.81
  • 移动硬盘

获取源码

从清华AOSP镜像下载初始包（大小24GB）：

{% highlight shell %} $ wget http://mirrors.tuna.tsinghua.edu.cn/aosp-monthly/aosp-latest.tar # 下载初始化包 {% endhighlight %}

下载完成后，做文件MD5校验：

{% highlight shell %} $ openssl md5 aosp-latest.tar {% endhighlight %}

输出结果和checksum.txt比对，结果一致。

创建一个区分大小写的android卷： {% highlight shell %} $ hdiutil create -type SPARSE -fs 'Case-sensitive Journaled HFS+' -size 80g -volname android /Volumes/Samsung_T1/android.dmg // 移动硬盘Samsung_T1 {% endhighlight %}

生成位置 /Volumes/Samsung_T1/android.dmg.sparseimage。双击打开android卷，将源码拷贝到android卷中，解压源码：

{% highlight shell %} $ tar xf aosp-latest.tar {% endhighlight %}

同步最新源码： {% highlight shell %} $ cd AOSP # 解压得到的 AOSP 工程目录 $ repo sync {% endhighlight %}

编译源代码

在AOSP目录下执行如下命令：

{% highlight shell %} $ source build/envsetup.sh // 设置环境变量 $ make -j4 // 执行编译选项 {% endhighlight %}

报错： {% highlight shell %} build/core/config.mk:618: *** Error: could not find jdk tools.jar at /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/../lib/tools.jar, please check if your JDK was installed correctly. Stop. {% endhighlight %}

修改Java环境变量： {% highlight shell %} $ JAVA_HOME=/usr/libexec/java_home -v 1.8 $ PATH=${JAVA_HOME}/bin:$PATH {% endhighlight %}

再执行编译选项，报错：

{% highlight shell %} Unsupported curl, please use a curl not based on SecureTransport {% endhighlight %}

解决方法是要用openssl重新编译一个curl。

{% highlight shell %} $ ./configure --prefix=/usr/local/curl --with-ssl=/usr/local/Cellar/openssl/1.0.2d_1 $ make $ make install {% endhighlight %}

设置curl环境变量 {% highlight shell %} $ sudo vim /etc/paths {% endhighlight %}

在文件开头添加/usr/local/curl/bin,保存退出。再一次执行编译命令，报错： {% highlight shell %} FAILED: /bin/bash out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/dex-dir/classes.dex.rsp Out of memory error (version 1.2-rc1 'Carnac' (296000 4ba365ab8a3d2c7e55c3428f919af59e687258fa by android-jack-team@google.com)). GC overhead limit exceeded. Try increasing heap size with java option '-Xmx'. Warning: This may have produced partial or corrupted output. [ 0% 23/13788] Building with Jack: out/target/common/obj/JA...IBRARIES/android-support-v4-donut_intermediates/classes.jack ninja: build stopped: subcommand failed. make: *** [ninja_wrapper] Error 1 {% endhighlight %}

执行： {% highlight shell %} $ java -Xmx3072M -Xms2048M -XshowSettings:all {% endhighlight %}

再一次执行编译命令： {% highlight shell %} [ 99% 4568/4570] Target system fs image: out/target/product/generic/obj/PACKAGING/systemimage_intermediates/system.img Running: mkuserimg.sh out/target/product/generic/system out/target/product/generic/obj/PACKAGING/systemimage_intermediates/system.img ext4 system 1610612736 -D out/target/product/generic/system -L system out/target/product/generic/root/file_contexts.bin make_ext4fs -T -1 -S out/target/product/generic/root/file_contexts.bin -L system -l 1610612736 -a system out/target/product/generic/obj/PACKAGING/systemimage_intermediates/system.img out/target/product/generic/system out/target/product/generic/system Creating filesystem with parameters: Size: 1610612736 Block size: 4096 Blocks per group: 32768 Inodes per group: 8192 Inode size: 256 Journal blocks: 6144 Label: system Blocks: 393216 Block groups: 12 Reserved block group size: 95 Created filesystem with 1487/98304 inodes and 105421/393216 blocks [100% 4570/4570] Install system fs image: out/target/product/generic/system.img out/target/product/generic/system.img+ maxsize=1644333504 blocksize=2112 total=1610612736 reserve=16610880 [100% 4570/4570] Checking build with Jack: out/target/common/obj/APPS/EmailTests_intermediates/jack.check.timestamp {% endhighlight %}

成功，输出目录为/Volumes/Android/AOSP/out/target/product/generic，包含system.img、ramdisk.img、userdata.img等。

查看源码

在AOSP根目录执行: {% highlight shell %} $ make idegen && development/tools/idegen/idegen.sh {% endhighlight %}

用Android Studio打开生成的android.ipr文件阅读源码。

参考：