A dummy benchmark helper

BenchmarkUtil.java

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public final class BenchmarkUtil {

    private static final List<Long> TIMES = new ArrayList<>(10);

    private static long startNanos;

    public static void started() {
        startNanos = System.nanoTime();
    }

    public static void ended() {
        final long endNanos = System.nanoTime();
        final long elapsedNanos = endNanos - startNanos;
        TIMES.add(elapsedNanos);
        final int count = TIMES.size();

        long sum = 0;
        for (int i = 0; i < count; i++) {
            sum += TIMES.get(i);
        }
        final long mean = sum / count;

        Collections.sort(TIMES);
        final long median;
        final int middle = count / 2;
        if (count % 2 == 1) {
            median = TIMES.get(middle);
        } else {
            median = (TIMES.get(middle - 1) + TIMES.get(middle)) / 2;
        }

        Log.d("TIME", "elapsed=" + elapsedNanos + "; mean=" + mean + "; median=" + median + "; count=" + count);
    }

    private BenchmarkUtil() {}

}