Android : Java BlockingQueue

I'm using a ThreadPoolExecutor in some code, and I supply it with a BlockingQueue<Runnable>. I get a compiler error saying can't resolve constructor. So I tried casting queue explicitly to BlockingQueue<Runnable>. However, I'm getting a compiler error by the ThreadPoolExecutor's constructor:

Inconvertible types, cannot cast PriorityBlockingQueue<MyRunnable> to BlockingQueue<Runnable>

This is happening even though PriorityBlockingQueue implements BlockingQueue and MyRunnable implements Runnable. I'm using Java 7 on Android.

Code:

public class Test {
    PriorityBlockingQueue<MyRunnable> queue = new PriorityBlockingQueue<>(...);

    //compiler error without cast
    ThreadPoolExecutor executor = new ThreadPoolExecutor(..., queue, ...);
    //compiler error with cast
    ThreadPoolExecutor executor = new ThreadPoolExecutor(..., (BlockingQueue<Runnable> queue, ...);

    public static class MyRunnable implements Runnable {...}

Temporary Solution:

In order to get it to compile, I've changed the cast to (BlockingQueue), but I get a unchecked case warning (which I suppressed). I know that I can make queue a BlockingQueue<Runnable> but then I have to cast in a bunch of places throughout my code which I'd rather not do.

Is there something that I'm missing, or is the unchecked warning my best shot.