No good way to tell what type a JObject is

[TheLastGimbus]

Hello!

I'm not sure if there already is some underlying issue about this here, but I will just describe my problem:

As i continiued implementing BroadcastReceivers from #854, i wanted to get all the extras as a Map<String, dynamic> - I know there are already .getIntExtra() ..., which would be very type-safe, but I wanted to make use of Dart3 pattern matching ✨ So i made this:

@Keep
class TheLastUtils() {
    companion object {
        @JvmStatic
        fun getIntentExtras(intent: Intent): Map<String, Any?> {
            val extras = intent.extras
            val map = mutableMapOf<String, Any?>()
            if (extras != null) {
                for (key in extras.keySet()) {
                    map[key] = extras.get(key)
                }
            }
            return map
        }
    }
}

void onReceive(android.Context context, android.Intent intent) {
  // convert to Map<String, JObject>
  final map = android.TheLastUtils.getIntentExtras(intent)
      .map((key, value) => MapEntry(key.toDartString(), value));
  // turn into a record for handi switch-case:
  switch((intent.getAction().toDartString(), map))
    case (
        android.BluetoothAdapter.ACTION_STATE_CHANGED,
        {
          android.BluetoothAdapter.EXTRA_STATE: int state,
          android.BluetoothAdapter.EXTRA_PREVIOUS_STATE: int _,
          // int's didn't match, so i later also tried:
          // ...EXTRA_STATE: JInteger state
          // but also didn't work
        },
    ):
    // later, i catched them with var, and tried to:
    print('obj is:\n'
        'int: ${state is int}\n'
        'bool: ${state is bool}\n'
        'jint: ${state is JInteger}\n'
        'then its: ${state.getClass()} ; ${state.runtimeType} ; ${state.$type}');
    // it printed:
    // obj is:
    // int: false
    // bool: false // ofc
    // jint: false
    // then its: Instance of 'JClass' ; JObject ; Instance of 'JObjectType'

    // also, every time i tried to print(state), it printed the number corretly
    // so, i tried to dangerously:
    final jint = JInteger.fromRef(state.reference);
    // and it worked
    // but also did this:
    final jbool = JBoolean.fromRef(state.reference);
    // and this:
    print(jbool); // 13
    // only this finally crashed:
    print(jint.booleanValue() ? "true" : "falsh");
    // can't call boolean java.lang.Boolean.booleanValue() on instance of java.lang.Integer
}

So as of now, i don't see any way to tell what underlying class a JObject is :(

[HosseinYousefi]

i don't see any way to tell what underlying class a JObject is

You need to check the runtime type of a Java object by calling IsInstanceOf JNI function. It's easier to expose this functionality outside of Jni.env.IsInstanceOf(obj, clazz) and there is an issue tracking this: #1033.

It's not possible to do pattern matching on Java runtime type of an object.