To communicate with Android to ReactNative I use RCTEventEmitter. Using this I need parse array to RN side and this array should set on WritableMap object.
On WritableMap object can put Array as shown below,
void putArray(@NonNull String key, @Nullable ReadableArray value);
How to create and add data into ReadableArray ?
I think you're looking for the WritableArray. You can create one like this:
// Initialize an empty array
WritableArray array = new WritableNativeArray();
// Add items to array using its push methods, for example
array.pushString("test");
Arguments from React Native Bridge has a helper method Arguments.fromList(list) that returns a WritableArray, which is a subclass of ReadableArray, so satisfies the condition and is ready to pass to putArray.
For example, to take a list and push it to a JS event as an array property:
Kotlin:
import com.facebook.react.bridge.Arguments
// ...
val params = Arguments.createMap().apply {
putArray("data", Arguments.fromList(someList))
// ...put more params
}
Java:
import com.facebook.react.bridge.Arguments;
// ...
WriteableArray array = Arguments.fromList(someList);
WritableMap params = Arguments.createMap();
params.putArray(array);
// ...put more params
Pass these to .emit("SomeEvent", params) and JS should receive { data: [...someList] }.
There's also Arguments.makeNativeArray(list), which has an almost identical API and implementation to .fromList - both create a WritableArray by iterating a list arg, pushing each item by type. The only differences I can see are:
.fromList explicitly handles nested arrays.makeNativeArray explicitly handles null (returning an empty array)