1. 错误值
1.1. 文件汇总
external/kernel-headers/original/asm-generic/error-base.hexternal/kernel-headers/original/asm-generic/error.hframeworks/native/include/utils/Errors.hframeworks/av/include/media/stagefright/MediaErrors.hframeworks/av/include/drm/drm_framework_common.hExternal/chromium/net/base/net_error_list.h
1.2. 详细介绍
external/kernel-headers/original/asm-generic/error-base.h
标准的Linux错误值范围 1 ~ 34
external/kernel-headers/original/asm-generic/error.h
同上， 范围 35 ~ 131
frameworks/native/include/utils/Errors.h
OK, NO_ERROR: 0其余的错误值，基本是以负基本Linux错误值的原则定义的
frameworks/av/include/media/stagefright/MediaErrors.h
MediaErrors: -1000 ~ -1014DRM
-2000 ~ -2007DRM_VENDOR: -2500 ~ -2999DRM_WV_VENDOR: 同上
frameworks/av/include/drm/drm_framework_common.h
同上的DRM部分，需要与它同步更新-2000 ~ -2007
External/chromium/net/base/net_error_list.h
HTTP连接时，出错的错误值。ChromiumHTTPDataSource类中就用到了
2. 基础类库
Native层通用类库
代码位置
frameworks/native/include/utils/frameworks/native/libs/utils/ 详细介绍
RefBase, Looper, Thread, Mutex, Condation, RWLock,Debug, Log, Trace,List, Vector, KeyVector, StoredVector, PropertyMap, String8, String16, StringArray,ShareBufer, BitSet, BlobCache, Singleton, Unicode,ZipFile MultiMedia层通用类库
代码位置
frameworks/av/include/media/stagefright/foundation/frameworks/av/media/stagefght/foundation/ 详细介绍
AHandler, ALooper, AMessage, ABufferAString: 仿标准库中的std::string， 很好用
