This is the default react-native application though also adds examples of native widgets. This example's concern is native widgets and not the (react-native) app itself... Just some examples of how you can have a widget within your react-native application.
npm install
In Android widgets can not be created using react-native. You will need to create them yourself (java) https://developer.android.com/design/patterns/widgets.html
In iOS widgets are extensions to the notification and can not be created using react-native. You will need to create them yourself (Obj-C ose).
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- enable gradle daemon for faster compiles https://docs.gradle.org/2.14.1/userguide/gradle_daemon.html
- start an emulator
- for the initial bundle run
npm run bundle-androidelse the app will fail onreact-native run-android(http://stackoverflow.com/questions/38870710/error-could-not-get-batchedbridge-make-sure-your-bundle-is-packaged-properly) - for the java changes you need to (re)run
react-native run-androidpossibly remove the previous widget and add the updated widget - for hot reloading of the app itself you need to be running
npm start- use ctrl/cmd-M on the emulator for the react-native menu .. to reload the app
Note: Have you changed the java code then react-native run-android on the project and re-add the widget
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Your react-native application may need to store auth for the native widget to access remote data.