for (int i = 0; i < mainDataList.size(); i++) {
			imageMstForm = mainDataList.get(i);
			imageDetailForm = getImageDetailForm(imageMstForm.getKey());
			String imageUrl = imageDetailForm.getData();
			thread[i] = new Thread(new ImageThread(imageList,i,imageUrl));
			thread[i].start();
-------------------------------
thread[i].join();
-------------------------------
		}
		

		for (int i = 0; i < mainDataList.size(); i++) {
			try {
				thread[i].join();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}