React Native - initialProperties Android

Question

I'm working under React-Native and I'm looking for passing initial props to JS via Java. This can be done easily in Objective-C with initialProperties like this :

RCTRootView *rootView = [[RCTRootView alloc] initWithBundleURL:jsCodeLocation
                                                      moduleName:@"myapp"
                                               initialProperties:initialProperties
                                                   launchOptions:launchOptions];

Where initialProperties is an NSDictionary which will be converted in JSON and available in JS via this.props. So I'm looking to do the same in Android. Any help ? Thanks

Answer 1

In Android, you can pass initialProps in with the launchOptions as a Bundle.

As is mentioned here in the source code: https://github.com/facebook/react-native/blob/7377fdcc70b25eb023e7c6d1b37eeae2a700cb88/ReactAndroid/src/main/java/com/facebook/react/ReactRootView.java#L325-L334

So you can do something like this:

Bundle initialProps = new Bundle();
initialProps.putString("myKey", "myValue");

mReactRootView.startReactApplication(mReactInstanceManager, "MyAwesomeApp", initialProps);

Answer 2

getlauchOptions has been moved inside ReactActivityDelegate, now I use this code:

public class MainActivity extends ReactActivity {

/**
 * Returns the name of the main component registered from JavaScript.
 * This is used to schedule rendering of the component.
 */
@Override
protected String getMainComponentName() {
    return "myAppName";
}

@Override
protected ReactActivityDelegate createReactActivityDelegate() {
    return new ReactActivityDelegate(this, getMainComponentName()) {
        @Nullable
        @Override
        protected Bundle getLaunchOptions() {
            Bundle initialProps = new Bundle();
            initialProps.putString("SOME_VARIABLE_1", BuildConfig.SOME_VARIABLE_1);
            initialProps.putString("SOME_VARIABLE_2", "some variable 2 value");
            return initialProps;
        }
    };
}