create java hashmap with Unity AndroidJavaObject

Question

I have a method in my java library that gets a Map as an input.
here is my java method

public void myMethod(Map<String, String> map){
    //do some thing with this map
}

And my C# code in Unity

AndroidJavaObject javaMap= new AndroidJavaObject("java.util.HashMap");
javaMap.Call("put", "key1", "value1");
AndroidJavaClass javaClass = new AndroidJavaClass("com.alirezaahmadi.android.sdk.core.BaseAPI");
javaClass.CallStatic("myMethod", javaMap);

I can try some code like this but Map is a generic class and this code doesn't work

when i run this i get this error

AndroidJavaException: java.lang.NoSuchMethodError: no non-static method with name='put' signature='(Ljava/lang/String;Ljava/lang/String;)V' in class Ljava.lang.Object;
java.lang.NoSuchMethodError: no non-static method with name='put' signature='(Ljava/lang/String;Ljava/lang/String;)V' in class Ljava.lang.Object;

How can i fix this and path a java hashmap to this method. BTW I can not change the java code.

Answer 1

After hours of trying I found this code to convert my C# dictainary to AndroidJavaObject HashMap

public static AndroidJavaObject CreateJavaMapFromDictainary(IDictionary<string, string> parameters)
{
    AndroidJavaObject javaMap = new AndroidJavaObject("java.util.HashMap");
    IntPtr putMethod = AndroidJNIHelper.GetMethodID(
        javaMap.GetRawClass(), "put",
            "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;");

    object[] args = new object[2];
    foreach (KeyValuePair<string, string> kvp in parameters)
    {

        using (AndroidJavaObject k = new AndroidJavaObject(
            "java.lang.String", kvp.Key))
        {
            using (AndroidJavaObject v = new AndroidJavaObject(
                "java.lang.String", kvp.Value))
            {
                args[0] = k;
                args[1] = v;
                AndroidJNI.CallObjectMethod(javaMap.GetRawObject(),
                        putMethod, AndroidJNIHelper.CreateJNIArgArray(args));
            }
        }
    }

    return javaMap;
}

Then i simply call my method and path the map like this

AndroidJavaObject javaMap = CreateJavaMapFromDictainary(myDictainry);
AndroidJavaClass javaClass = new AndroidJavaClass("com.alirezaahmadi.android.sdk.core.BaseAPI");
javaClass.CallStatic("myMethod", javaMap);