[RN]使用React Native Navigation v2

官网

https://wix.github.io/react-native-navigation/v2/#/docs/Installing

坑：

1.需要改application，这个和之前把rn加入已经有的android project是不一样的。并且加完之后，需要删除之中的旧的代码
2.注意这个reactNative51要和Android studio中Module的build Variant一致。

android { 
    compileSdkVersion 27
    buildToolsVersion '27.0.3'
    defaultConfig { 
      minSdkVersion 21
      targetSdkVersion 27  
      missingDimensionStrategy "RNN.reactNativeVersion", "reactNative51"
    }
} 

3.app下的settings.gradle

include ':app'
include ':react-native-gesture-handler'
project(':react-native-gesture-handler').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-gesture-handler/android')
include ':react-native-navigation'
project(':react-native-navigation').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-navigation/lib/android/app/')