gistfile1.java

import dalvik.system.*;
import java.util.*;

public class Test {
    public static void main(String[] args) throws Exception {
        DexFile d = DexFile.loadDex(args[0], null /* output */, 0);
        Enumeration<String> e = d.entries();
        while (e.hasMoreElements()) {
            System.out.println(e.nextElement());
        }
    }
}

/*
$ time adb shell dalvikvm -cp /data/local/tmp/Test.dex Test /data/app/com.twitter.android-2/base.apk | wc -l
6109

real	0m0.863s
user	0m0.002s
sys	0m0.091s
*/