How to access ReactContextBaseJavaModule from both, a react native file (.js) and a Kotlin class (.kt)?

Question

I am new to React Native and working on an application which stores local data using Android SharedPreferences. I currently have SharedPreferences setup as ReactContextBaseJavaModule and am able to access all methods through @ReactMethod annotation from a React Native file.

I need to access the value from SharedPreference, defined as ReactContextBaseJavaModule, inside native Android module. Currently I am able to achieve that by updating a constant defined in native Android class(*.kt). Is there a better way to do this, i.e. ability to access methods defined inside ReactContextBaseJavaModule from Android classes or creating a wrapper for SharedPreference access?

I have tried to search for the solution in multiple platforms, and found solutions on how we can access native module from React Native files. I am unable to find the solution on two-way access to a ReactContextBaseJavaModule class.

The challenges I am facing:

Unable to pass ReactApplicationContext from native Android class for the class instance.
Unable to access methods annotated with @ReactMethod from native Android class.
Injecting native Android class instance inside ReactContextBaseJavaModule.

starball · Accepted Answer · 2023-05-04 02:02:33Z

0

Created a native android SharedPreferences class that exposes all the shared preferences related methods.

class MySharedPreferences constructor(context: Context) {/getters and setters/}

Created a ReactContextBaseJavaModule as a bridge to React Native with exposed methods annotated with @ReactModule. Created an instance of Android native SharedPreferences inside init{} method.

 class MySharedPreferencesModule(reactContext: ReactApplicationContext) : ReactContextBaseJavaModule(reactContext) {
  private var mySharedPreferences: BeaconSharedPreferences

 init {
     mySharedPreferences = MySharedPreferences(context = reactContext)
 }}

Now I am able to access Android native SharedPreferences with an instance inside the Android class where I need to access the prefs values, and access/update values through the bridge to/from React Native.

edited May 4, 2023 at 2:02

starball♦

59.5k52 gold badges312 silver badges1k bronze badges

answered May 4, 2023 at 1:05

Maitrey C

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