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报错如下：
Starting JS server...
Building and installing the app on the device (cd android && ./gradlew installDebug...
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
解决方案：
若一切环境都配置好，且android手机设备已连接，那么可以尝试以下来确保权限是否足够
在项目的终端中添加以下命令：
chmod 755 android/gradlew
即可，亲测可行。