private void recommend(String type){
        Vector<String> doneProbs = FileUtil.getUserDoneProbs(Context.getUserID());
        boolean done[] = new boolean[4000];
        for(int i = 0;i < doneProbs.size();i++){
        	done[Integer.valueOf(doneProbs.get(i)) - 1000] = true;
        }
        String[] probs = FileUtil.getProbsOfType("problemType.txt", type);
        int counter = 0;
        recommendedProbs.setText("");
        for(int i = 0;i < probs.length;i++){
        	if(!done[Integer.valueOf(probs[i]) - 1000]){
        		recommendedProbs.append(probs[i] + "\t");
        		counter++;
        		if(counter >= 6)break;
        	}
        }
        if(recommendedProbs.getText() == ""){
        	recommendedProbs.setText("系统暂时没有该类型的题目推荐给你");
        }
    }