Android
From Wasya Wiki
Develop
pi_native, that's the newsitems app
Run Emulator
/Users/piousbox/Library/Android/sdk/tools/emulator -avd Nexus_5X_API_26
Reload App in Emulator
adb shell input keyevent 82
R+R
Build
From: https://facebook.github.io/react-native/docs/signed-apk-android
Generate key, then
./gradlew assembleRelease