React-Native开发：react-native-image-crop-picker图片上传组件的使用（安卓）

1、根据官网提供的步骤进行相应的设置

（1）npm i react-native-image-crop-picker --save

（2）react-native link react-native-image-crop-picker这里命令窗很不幸地始终没什么动静（除了几行字）

（3）Make sure you are using Gradle 2.2.x (android/build.gradle)：

buildscript {
    ...
    dependencies {
        classpath 'com.android.tools.build:gradle:2.2.3'
        ...
    }
    ...
}

（4）VERY IMPORTANT Add the following to your build.gradle’s repositories section. (android/build.gradle)：

allprojects {
    repositories {
      mavenLocal()
      jcenter()
      maven { url "$rootDir/../node_modules/react-native/android" }

      // jitpack repo is necessary to fetch ucrop dependency
      maven { url "https://jitpack.io" }
    }
}

（5）Add useSupportLibrary (android/app/build.gradle):

android {
    ...

    defaultConfig {
        ...
        vectorDrawables.useSupportLibrary = true
        ...
    }
    ...
}

（6）可选：app\src\main\AndroidManifest.xml

<uses-permission android:name="android.permission.CAMERA"/>

2、开始运行：

配置完上述内容后我用Android Studio重新build了一遍项目，但是报错了：
程序包com.reactnative.ivpusic.imagepicker不存在 找不到符号等等

搜索一番后得到一个方案：https://github.com/ivpusic/react-native-image-crop-picker/blob/79d3dab7e5dd377551701a74203deb5667bdfde2/README.md#android-1

然鹅还是有问题，运行起来还是有问题，应该是链接原生库没成功（react-native link react-native-image-crop-picker）。最终经过多次尝试后，我修改了以下文件的以下地方：

（1）file: android/app/build.gradle：

dependencies {
    ...
    compile project(':react-native-image-crop-picker')
}

（2）file: MainApplication.java

...

import com.reactnative.ivpusic.imagepicker.PickerPackage; // import package

public class MainApplication extends ReactApplication {
...
   /**
   * A list of packages used by the app. If the app uses additional views
   * or modules besides the default ones, add more packages here.
   */
    @Override
    protected List<ReactPackage> getPackages() {
        return Arrays.<ReactPackage>asList(
            new MainReactPackage(),
            new PickerPackage() // Add package
        );
    }
...
}

（3）file: android/settings.gradle:

include ':react-native-image-crop-picker'
project(':react-native-image-crop-picker').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-image-crop-picker/android')

（4）此时再用Android Studio重新build了一遍项目即可成功使用react-native-image-crop-picker了，是在不行将node_modules删除，重新安装依赖，再多build几遍项目试试。该插件具体使用可以参考https://blog.csdn.net/u013718120/article/details/72781285。