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How to pass initial props from Android native.

Ryohlan on November 16, 2017

There is a official document of passing initial props from iOS native, but not Android. It is passed by getLaunchOptions of ReactActivityDelegate....
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silhouette5366 profile image
silhouette5366 •

On doing console.warn(props.message) in constructor it is showing warning as "undefined". Help cannot send initial props.

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ryohlan profile image
Ryohlan •

Hi, I tried it on v0.58. It works successfully.

This props can receive only entry point which the default is App.js.

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silhouette5366 profile image
silhouette5366 •

I think my entry point is index.js which then calls the App.js.

Here is the index.js code:

import {AppRegistry} from 'react-native';
import App from './App';
import {name as appName} from './app.json';
AppRegistry.registerComponent(appName, () => App);

Then the main working code is in App.js
what should i do?

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ryohlan profile image
Ryohlan •

See github.com/ryohlan/react-native-pl...

The diff is only that from initialize.

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silhouette5366 profile image
silhouette5366 •

I got the problem. Actually its not working in case when I use react-navigatin stack navigator, when I remove the stack navigator, it's working.
How to use it along with stack navigator?

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ryohlan profile image
Ryohlan •

Pass App.js props to react-navigation root component. it should be worked.

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Tomasz Nowak •

My app crashes with "cannot find symbol @Nullable" message. When I remove this decorator it works fine, but I don't know java at all and not sure if something can go wrong without it. Is it ok to remove @Nullable?

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ryohlan profile image
Ryohlan •

Did you import javax.annotation.Nulalble?

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tnweiss profile image
Tomasz Nowak •

No, I didn't, thanks. Now it looks pretty obvious, but I couldn't find any information that Nullable should be imported.

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lmichailian profile image
Lucas Michailian •

Excelent post! A question: How if I want do this but onResume lifecycle ??

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ryohlan profile image
Ryohlan •

Thank you :)

This is for initialization.

You should use NativeEventEmitter ;)
facebook.github.io/react-native/do...

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lmichailian profile image
Lucas Michailian •

Thanks for your reply !

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silajitbukaisil profile image
Silajit Sil •

{this.props.message} .... This is not showing anything on the screen. And even though there is no error also. Can you please help what is wrong here?

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ryohlan profile image
Ryohlan •

Hi, I tried it on v0.58. It works successfully.

This props can receive only entry point which the default is App.js.