删除JSONArray中的某个元素

public void removeThisGarden(String gardenId){
        try {
            List list = new ArrayList();
            String gardens = SharePreferenceUtil.getStringDataByKe(this,"gardens",null);
            gardenArray = new JSONArray(gardens);
            for (int i = 0;i<gardenArray.length();i++){
                list.add(gardenArray.get(i));
                JSONObject gardenjson = (JSONObject) gardenArray.get(i);
                if (gardenId.equals(gardenjson.getString("gardenId"))){
                    list.remove(i);
                }
                gardenArray = new JSONArray(list);
                SharePreferenceUtil.saveStringDataToSharePreference(this,gardenArray.toString());
            }
        }catch (JSONException e){
            e.printstacktrace();
        }
    }