CODEWITHSUNDEEP
javaandroidgenericsrobolectric
Donn Felker
Donn Felker

Reputation: 9651

Android Java Static Generic Call

I'm working with Robolectric, and in the Robolectric class there is a static method: 

public static <P, R> P shadowOf_(R instance) {
    return (P) ShadowWrangler.getInstance().shadowOf(instance);
}

I've come from a long time C# Generics background so I could be thinking of this incorrectly. My first instinct was to utilize this as such: 

Robolectric.shadowOf_<MyShadow>(myInstance).foo();

However, this does not compile (plus, to me and my C# generics background, it doesnt look right).

How can I use this method?

Source of the method is located here.

Upvotes: 0

Views: 226

Answers (2)

irreputable
irreputable

Reputation: 45443

compiler can't infer what P is. Suppose P should be A here, you can

A a = Robolectric.shadowOf_(myInstance); // compiler can infer P=A here
a.foo();

Upvotes: 0

Oliver Charlesworth
Oliver Charlesworth

Reputation: 272517

I believe you need:

Robolectric.<MyShadow,X>shadowOf_(myInstance).foo();

where X is whatever the type of myInstance is.

Upvotes: 2

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