ReactNative Could not install the app on the device(Mac OS环境)

我们从github下载的ReactNative(以下简称RN)经常会出现这个错误：

Could not install the app on the device, read the error above for details.

Make sure you have an Android emulator running or a device connected and have

set up your Android development environment:

https://facebook.github.io/react-native/docs/android-setup.html

导致构建失败BUILD FAILED.

看到上述的命令行提示，发现他的意思是我们的安卓环境可能配置的不对，还让我们去官网看看，那好吧，咱们到官网一看，有个步骤是这样的

Set up paths 

The React Native command line interface requires the ANDROID_HOME environment variable to be set up. You can configure it in a Terminal using the following command:

export ANDROID_HOME=~/Library/Android/sdk
export ANDROID_HOME=~/Library/Android/sdkexport PATH=${PATH}:${ANDROID_HOME}/tools

To avoid doing this every time you open a new Terminal, create (or edit) ~/.bashrc using your favorite text editor and add the following lines:

The second line will add the android tool to your path, which will come in handy in the next step.

Please make sure you export the correct path for ANDROID_HOME if you did not install the Android SDK using Android Studio. If you install the Android SDK using Homebrew, it will be located at /usr/local/opt/android-sdk.

这个是环境相关的配置，咱们只需要这样在命令行中输入：export ANDORD_HOME = 我们的android sdk 路径（一个细节后面记得加上 sdk,这个目录才是sdk的位置，否则还是会报错，我就是忘记加这个了）

然后上面设置完成后设置到环境变量PATH中即可

export PATH = ${PATH}:${ANDROID_HOME}/tools

上述配置完成后，react-native run-android 继续运行，这个时候他会构建运行该项目的必需project，我们等待即可，这个时候如果gradle 是1.3.1，命令行中可能会出现以下错误：

com.android.ddmlib.InstallException: Unable to upload some APKs

 需要将project的gradle version修改到1.2.3，可能这个版本命令行启动不了

http://blog.csdn.net/shenshibaoma/article/details/52936349 可以看下我这篇博客的介绍,有说到这个错误。