Looper pool

gistfile1.txt

public class LooperPool {

    private final ArrayList<Handler> mIdleHandlers = new ArrayList<Handler>();

    public void addTask(final Runnable task) {
        Handler handler = null;
        synchronized (mIdleHandlers) {
            if (!mIdleHandlers.isEmpty()) {
                handler = mIdleHandlers.remove(mIdleHandlers.size() - 1);
            }
        }
        if (handler != null) {
            handler.post(task);
        } else {
            new Thread() {
                @Override
                public void run() {
                    Looper.prepare();
                    final Handler newHandler = new Handler();
                    Looper.myQueue().addIdleHandler(new MessageQueue.IdleHandler() {
                        @Override
                        public boolean queueIdle() {
                            synchronized (mIdleHandlers) {
                                mIdleHandlers.add(newHandler);
                            }
                            return true;
                        }
                    });
                    newHandler.post(task);
                    Looper.loop();
                }
            }.start();
        }
    }

}