src/main/java/com/xtremelabs/robolectric/util/RobolectricBackgroundExecutorService.java

package com.xtremelabs.robolectric.util;

import com.xtremelabs.robolectric.Robolectric;

import java.util.Collection;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.FutureTask;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class RobolectricBackgroundExecutorService implements ExecutorService {
    @Override
    public void shutdown() {
        throw new UnsupportedOperationException();
    }

    @Override
    public List<Runnable> shutdownNow() {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean isShutdown() {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean isTerminated() {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean awaitTermination(long l, TimeUnit timeUnit) throws InterruptedException {
        throw new UnsupportedOperationException();
    }

    @Override
    public <T> Future<T> submit(Callable<T> tCallable) {
        return schedule(new FutureTask<T>(tCallable));
    }

    @Override
    public <T> Future<T> submit(Runnable runnable, T t) {
        return schedule(new FutureTask<T>(runnable, t));
    }

    @Override
    public Future<?> submit(Runnable runnable) {
        return submit(runnable, null);
    }

    private <T> Future<T> schedule(final FutureTask<T> futureTask) {
        Robolectric.getShadowApplication().getBackgroundScheduler().post(new Runnable() {
            @Override
            public void run() {
                futureTask.run();
            }
        });

        return futureTask;
    }

    @Override
    public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> callables) throws InterruptedException {
        throw new UnsupportedOperationException();
    }

    @Override
    public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> callables, long l, TimeUnit timeUnit) throws InterruptedException {
        throw new UnsupportedOperationException();
    }

    @Override
    public <T> T invokeAny(Collection<? extends Callable<T>> callables) throws InterruptedException, ExecutionException {
        throw new UnsupportedOperationException();
    }

    @Override
    public <T> T invokeAny(Collection<? extends Callable<T>> callables, long l, TimeUnit timeUnit) throws InterruptedException, ExecutionException, TimeoutException {
        throw new UnsupportedOperationException();
    }

    @Override
    public void execute(Runnable runnable) {
        submit(runnable);
    }
}