为何要自己编译React Native安卓私有代码
我们在开发中遇到一个HTTP2的问题，React Native安卓客户端在和HTTP2支持的服务器通讯的过程中会有crash,见
由于时间紧急，发布期限已经拖了好久了，没法等待官方解决方案，只能在本地做修复然后发布。
编译私有React-Native
针对android，React-Native有官方指导说明.
过程中遇到不少坑，记录如下:
boost下载失败
说明文档里面指定的 gradle-download-task版本有问题， 要用最新版，老版的2.0.0会抛403下载失败，导致编译通不过。测试de.undercouch:gradle-download-task:3.1.2可以工作。
classpath 'de.undercouch:gradle-download-task:3.1.2'
NDK版本不对导致编译失败
文档里面指定NDK是android-ndk-r10e, 我用brew搜不到r10e,于是装了一个13b, 结果编译错误，只能乖乖手动下载r10e的包然后解压，然后在.zshrc里面设置ANDROID_NDK路径
export ANDROID_NDK=/Users/your_home/android-ndk/android-ndk-r10e
用android-ndk-r13b编译抛错如下:
:ReactAndroid:buildReactNdkLib
[armeabi-v7a] Compile++ : reactnativejni <= Dummy.cpp
[armeabi-v7a] Compile++ : reactnativejnifb <= CatalystInstanceImpl.cpp
make: [armeabi-v7a] Compile++ : reactnativejnifb <= CxxModuleWrapper.cpp
/usr/local/Cellar/android-ndk/r13b/toolchains/arm-linux-androideabi-4.8/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-g++: No such file or directory
make: /usr/local/Cellar/android-ndk/r13b/toolchains/arm-linux-androideabi-4.8/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-g++: No such file or directory
[armeabi-v7a] Compile++ : reactnativejnifb <= JExecutorToken.cpp
make: /usr/local/Cellar/android-ndk/r13b/toolchains/arm-linux-androideabi-4.8/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-g++: No such file or directory
make: /usr/local/Cellar/android-ndk/r13b/toolchains/arm-linux-androideabi-4.8/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-g++: No such file or directory
make: *** [/Users/andrewy/sourcecode/github/dgandroid3/ReactNative/dgAndroid/node_modules/react-native/ReactAndroid/build/tmp/buildReactNdkLib/local/armeabi-v7a/objs/reactnativejni/Dummy.o] Error 1
make: *** Waiting for unfinished jobs....
make: *** [/Users/andrewy/sourcecode/github/dgandroid3/ReactNative/dgAndroid/node_modules/react-native/ReactAndroid/build/tmp/buildReactNdkLib/local/armeabi-v7a/objs/reactnativejnifb/CxxModuleWrapper.o] Error 1
make: *** [/Users/andrewy/sourcecode/github/dgandroid3/ReactNative/dgAndroid/node_modules/react-native/ReactAndroid/build/tmp/buildReactNdkLib/local/armeabi-v7a/objs/reactnativejnifb/CatalystInstanceImpl.o] Error 1
make: *** [/Users/andrewy/sourcecode/github/dgandroid3/ReactNative/dgAndroid/node_modules/react-native/ReactAndroid/build/tmp/buildReactNdkLib/local/armeabi-v7a/objs/reactnativejnifb/JExecutorToken.o] Error 1
[armeabi-v7a] Compile++ : reactnativejnifb <= JMessageQueueThread.cpp
make: /usr/local/Cellar/android-ndk/r13b/toolchains/arm-linux-androideabi-4.8/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-g++: No such file or directory
make: *** [/Users/andrewy/sourcecode/github/dgandroid3/ReactNative/dgAndroid/node_modules/react-native/ReactAndroid/build/tmp/buildReactNdkLib/local/armeabi-v7a/objs/reactnativejnifb/JMessageQueueThread.o] Error 1
:ReactAndroid:buildReactNdkLib FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':ReactAndroid:buildReactNdkLib'.
> Process 'command '/usr/local/Cellar/android-ndk/r13b/ndk-build'' finished with non-zero exit value 2
react-native-fetch-blob编译失败
（实际上把后面的react-native 重复的问题解决后这个问题会自动解决,可以跳过, 还是要手动改依赖）
ndk的问题解决以后，react-native-fetch-blob编译又失败了.提示okhttp3找不到。
解决方法: 把react-native-fetch-blob/android/build.gradle下面的
compile 'com.facebook.react:react-native:+'
替换成
compile project(':ReactAndroid')
Step 2: Create a local.properties file in the android directory of your react-native app with the following contents:
Example:
sdk.dir=/Users/your_unix_name/android-sdk-macosx
ndk.dir=/Users/your_unix_name/android-ndk/android-ndk-r10e
Download links for Android NDK
Mac OS (64-bit) - http://dl.google.com/android/repository/android-ndk-r10e-darwin-x86_64.zip
Linux (64-bit) - http://dl.google.com/android/repository/android-ndk-r10e-linux-x86_64.zip
Windows (64-bit) - http://dl.google.com/android/repository/android-ndk-r10e-windows-x86_64.zip
Windows (32-bit) - http://dl.google.com/android/repository/android-ndk-r10e-windows-x86.zip
You can find further instructions on the official page.
https://facebook.github.io/react-native/docs/android-building-from-source.html
react-native 重复的问题
前面所有问题解决以后还可能会遇到下面的问题
:app:processDebugResources FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:processDebugResources'.
> Error: more than one library with package name 'com.facebook.react'
解决办法: 在your_project_root/android/app/build.gradle里面添加如下配置(放在dependency同一层级即可)
configurations.all {
exclude group: 'com.facebook.react', module: 'react-native'
}
Boost 下载失败的问题。
首先，你可以尝试更新 gradle-download-task 到 3.1.2，这可以解决gradle-download-task 2.0.0下载时抛403的问题。
然后，如果你网络比较差，经常下到一半超时断线,你可以在浏览器里面把boost下载下来，然后，命令行里面boost开始下载以后CTRL+C中断，然后用浏览器里面下载的boost覆盖目标boost. 我这边是
node_modules/react-native/ReactAndroid/build/downloads/boost_1_57_0.zip
再次运行react-native run-android
编译成功！
然后你的app跑起来的时候可能会遇到下面的问题, 心累！:
Shutting down VM
FATAL EXCEPTION: main
Process: com.dealglobe, PID: 2162
java.lang.UnsatisfiedLinkError: couldn't find DSO to load: libyoga.so
at com.facebook.soloader.SoLoader.loadLibraryBySoName(SoLoader.java:314)
at com.facebook.soloader.SoLoader.loadLibrary(SoLoader.java:247)
at com.facebook.csslayout.YogaNode.<clinit>(YogaNode.java:24)
at com.facebook.react.uimanager.ReactShadowNode.<init>(ReactShadowNode.java:82)
at com.facebook.react.uimanager.UIImplementation.createRootShadowNode(UIImplementation.java:84)
at com.facebook.react.uimanager.UIImplementation.registerRootView(UIImplementation.java:120)
at com.facebook.react.uimanager.UIManagerModule.addMeasuredRootView(UIManagerModule.java:198)
at com.facebook.react.XReactInstanceManagerImpl.attachMeasuredRootViewToInstance(XReactInstanceManagerImpl.java:803)
at com.facebook.react.XReactInstanceManagerImpl.setupReactContext(XReactInstanceManagerImpl.java:778)
at com.facebook.react.XReactInstanceManagerImpl.access$700(XReactInstanceManagerImpl.java:110)
at com.facebook.react.XReactInstanceManagerImpl$ReactContextInitAsyncTask.onPostExecute(XReactInstanceManagerImpl.java:224)
at com.facebook.react.XReactInstanceManagerImpl$ReactContextInitAsyncTask.onPostExecute(XReactInstanceManagerImpl.java:193)
at android.os.AsyncTask.finish(AsyncTask.java:632)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
经证实，这个是因为react-native代码不稳定造成的，切换到0.40-stable问题就消失了。
http://blog.ilibrary.me/2016/12/04/%E7%BC%96%E8%AF%91%E7%A7%81%E6%9C%89react-native%E4%BB%A3%E7%A0%81
