Runnable[] methods = new Runnable[]{
                new Runnable() {
                    @Override
                    public void run() {
                        Log.d("TAG", "1");
                       //1 method
                    }
                },
                new Runnable() {
                    @Override
                    public void run() {
                        Log.d("TAG", "2");
                         //2 method
                    }
                },
                new Runnable() {
                    @Override
                    public void run() {
                        Log.d("TAG", "3");
                        //3 method
                    }
                }
        };

ExecutorService service = Executors.newSingleThreadExecutor();
            for (Runnable r : methods)
                service.submit(r);
            service.shutdown();