ReactNative: 编译源码项目_plugin 'com.android.library' is already on the scr

有的时候我们需要通过修改源码来完成某些业务需求，并上传maven仓库，以便项目的引用，这样就需要成功编译源码。

首先克隆react-native项目到本地，下载地址https://github.com/facebook/react-native

我使用的版本是0.57.7，下面是遇到的报错问题

1.NDK未配置（这里一定要用r10e版本）

Execution failed for task ':ReactAndroid:buildReactNdkLib'.
> Process 'command '/******/Library/Android/android-ndk-r10e/ndk-build'' finished with non-zero exit value 2

配置Android NDK 为android-ndk-r10e

什么？明明配置了还是报这个错？别急我们把系统环境变量中gradle版本修改为2.2

修改gradle/gradle-wrapper.properties中的gradle版本

distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-2.2-all.zip

最外层build.gradle修改gradle版本3.1.4改为1.3.1

buildscript {
    repositories {
        mavenLocal()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.3.1'
        classpath 'de.undercouch:gradle-download-task:3.4.3'
 
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

发现终于不报这个错了

2.google()方法找不到

* Where:
Build file '/****/react-native-0.57.7/build.gradle' line: 9
 
* What went wrong:
A problem occurred evaluating root project 'react-native-0.57.7'.
> Could not find method google() for arguments [] on repository container.

那就按照提示的位置注释掉这个文件中所有google()方法，重新编译

3.子项目无法引入

* Where:
Build file '/****/react-native-0.57.7/ReactAndroid/build.gradle' line: 7
 
* What went wrong:
Error resolving plugin [id: 'com.android.library']
> Plugin 'com.android.library' is already on the script classpath. 
Plugins on the script classpath cannot be applied in the plugins {} block. 
Add  "apply plugin: 'com.android.library'" to the body of the script to use the plugin.

具体指明的是这里的代码

plugins {
    id("com.android.library")
    id("maven")
    id("de.undercouch.download")
}

那就统统改下

apply plugin: 'com.android.library'
apply plugin: 'maven'
apply plugin: 'de.undercouch.download'

4.不推荐使用NDK？

* Where:
Build file '/Users/zhangdong/Downloads/react-native-0.57.7/ReactAndroid/build.gradle' line: 263
 
* What went wrong:
A problem occurred evaluating project ':ReactAndroid'.
> Error: NDK integration is deprecated in the current plugin.  
Consider trying the new experimental plugin.  For details, see http://tools.android.com/tech-docs/new-build-system/gradle-experimental.  
Set "android.useDeprecatedNdk=true" in gradle.properties to continue using the current NDK integration.

按照提示在ReactAndroid中的gradle.properties文件中加入android.useDeprecatedNdk=true

5.gradle3.0一下不支持api方式引入第三方库

* Where:
Build file '/****/react-native-0.57.7/ReactAndroid/build.gradle' line: 300
 
* What went wrong:
A problem occurred evaluating project ':ReactAndroid'.
> Could not find method api() for arguments [com.facebook.infer.annotation:infer-annotation:0.11.2] on project ':ReactAndroid'.

那就都改一下，api改为compile，testImplementation改为testCompile，androidTestImplementation改为androidTestCompile

6.找不到依赖

* What went wrong:
A problem occurred configuring project ':ReactAndroid'.
> Failed to notify project evaluation listener.
   > Could not resolve all dependencies for configuration ':ReactAndroid:_debugCompile'.
      > Could not find com.android.support:appcompat-v7:27.1.1.
        Searched in the following locations:

最外层build.gradle的allprojects中添加

maven {
     url "https://maven.google.com"
}

7.ReactAndroid/build.gradle文件报错

* What went wrong:
Execution failed for task ':ReactAndroid:buildReactNdkLib'.
> Process 'command '/Users/zhangdong/Library/Android/android-ndk-r10e/ndk-build'' finished with non-zero exit value 2

What？？又是这个错，完全没有指明什么错误，查看ReactAndroid/build.gradle文件发现有些标红找不到，先注释掉，这只是一些异常捕获和编译环境的判断没有什么大碍

8.第三方库找不到对应文件

make: *** No rule to make target `/****/react-native-0.57.7/ReactAndroid/build/third-party-ndk/glog/glog-0.3.5/src/demangle.cc', 
needed by `/****/react-native-0.57.7/ReactAndroid/build/tmp/buildReactNdkLib/local/armeabi-v7a/objs/glog/glog-0.3.5/src/demangle.o'.  Stop.
make: *** Waiting for unfinished jobs....

查看build信息貌似是缺少文件了

通过build.gradle可以看到prepareGlog这个任务就是下载glog-0.3.5.tar.gz文件并解压到build/third-party-ndk/glog中，显然没有解压成功，既然这样我们就手动解压，保证编译通过

boost_1_63_0.tar.gz，double-conversion-1.1.6.tar.gz，folly-2016.10.31.00.tar.gz同样如此

 

未完待续