Exception in 'NativeModules': java.lang.RuntimeException: Got unknown argument class: Object

Question

I am trying to call a native ReactMethod from react native but it is throwing the following error:

C++ Exception in 'NativeModules': java.lang.RuntimeException: Got unknown argument class: Object

This is how I have the method defined in android:

@ReactMethod
public void setItem(String key, Object value) {
    // code
}

This is how i am calling this method:

MyModule.setItem("mykey", "1234567890");

I wonder if ReactMethod supports object type as parameter or not? Because I want to set any type of item.

Stofkn · Accepted Answer · 2017-01-29 12:31:08Z

15

According to the documentation, the following argument types are supported for methods annotated with @ReactMethod. The argument types directly map to their JavaScript equivalents.

Boolean -> Bool
Integer -> Number
Double -> Number
Float -> Number
String -> String
Callback -> function
ReadableMap -> Object
ReadableArray -> Array

In your case you could use a ReadableMap as argument, which maps on the JavaScript Object type.

answered Jan 29, 2017 at 12:31

Stofkn

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2 Comments

idearibosome Over a year ago

ReadableMap is for an associative array, thus it cannot be used for the other types.

user924 Over a year ago

was getting ReadableNativeArray cannot be cast to * from react, after hours understood that we have to use ReadableArray instead ReadableNativeArray, react errors are useless and misleading

idearibosome · Accepted Answer · 2019-01-15 11:38:40Z

1

You can use Dynamic type, which is actually not documented.

answered Jan 15, 2019 at 11:38

idearibosome

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