6.5.0 DropInClient - Method addObserver must be called on the main thread

I am working on react native module for DropIn and getting this error on initialization of DropInClient

implementation "com.braintreepayments.api:drop-in:6.5.0

         val dropInClient = DropInClient(currentActivity as AppCompatActivity?,clientToken)
         

Method addObserver must be called on the main thread

Why this error can appear?

[molchanovskiy]

@wayson I found a solution. You can init the drop in client with an empty token in onCreate() of Activity with shared instance and then use it inside the module by providing token and calling invalidateClientToken which will trigger fetch client token callback.

Activity onCreate():

      val dropInClient = DropInClient(this, ClientTokenProvider { callback ->
            // fetch client token asynchronously...
            callback.onSuccess(BraintreeSharedInstance.instance.clientToken);
        })
        BraintreeSharedInstance.instance.dropInClient = dropInClient

    Module call:

        BraintreeSharedInstance.instance.clientToken = token
          val dropInClient:DropInClient? = BraintreeSharedInstance.instance.dropInClient
          dropInClient?.invalidateClientToken()
          dropInClient?.setListener(PaymentDropInListener())
          dropInClient?.launchDropIn(dropInRequest)
        

[wayson]

@sshropshire Thanks for your reply. I’ve tried that but DropInClient can only be called in onCreate() on Activity. Otherwise we will have error of Method addObserver must be called on the main thread.

I’ve also tried

currentActivity.runOnUiThread(new Runnable() {
    @Override
    public void run() {
        // initialize DropInClient here
    }
});

But the app just crash straight away after this call.