Thread.join is not working

Question

I want to execute the following threads, and wait for them to finish in order to continue working, However, this is not achieved through my code and I don't know why, I suppose join should force the current thread to wait for all threads to finish!. I would be pleased if anyone could help me!

Here's my code:

ArrayList<Thread> retrievalThreads=new ArrayList<Thread>();

    retrievalThreads.add(new Thread(new Runnable() {
        @Override
        public void run() {
            getProfilePictures(false);
        }
    }));

    retrievalThreads.add(new Thread(new Runnable() {
        @Override
        public void run() {
            getNumVotesThisWeek();
        }
    }));

    retrievalThreads.add( new Thread(new Runnable() {
        @Override
        public void run() {
            getTotalVotes(true);
        }
    }));

    retrievalThreads.add(new Thread(new Runnable() {
        @Override
        public void run() {
            getTotalMatches();
        }
    }));

    retrievalThreads.add(new Thread(new Runnable() {
        @Override
        public void run() {
            getUserActivityLevel();
        }
    }));

    retrievalThreads.add(new Thread(new Runnable() {
        @Override
        public void run() {
            getUserMatchMakerLevel();
        }
    }));

    retrievalThreads.add(new Thread(new Runnable() {
        @Override
        public void run() {
            getLastBoostTimeStamp(true);
        }
    }));

    retrievalThreads.add(new Thread(new Runnable() {
        @Override
        public void run() {
            getLastStealTimeStamp(true);
        }
    }));

    retrievalThreads.add(new Thread(new Runnable() {
        @Override
        public void run() {
            getFacebookFriends();
        }
    }));

    //Start all above threads
    for (int i=0;i<retrievalThreads.size();i++)
        retrievalThreads.get(i).start();

    //Wait for them to finish
    for (int i=0;i<retrievalThreads.size();i++){
        try {
            retrievalThreads.get(i).join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    Log.i("Finished","TheAbove");

The printing in the Log Console is done before threads finish execution!

Answer 1

Thread.join() will wait only for the thread which creates volley reuqest, not all threads. Volley will spawn other threads to send the request asynchronously. You need synchronous volley requests .