原因：

SharedPreferences沒有保存數組的方法，但是有時候為了保存一個數組而進行序列化，或者動用sqlite都是有點殺豬焉用牛刀的感覺，所以就自己動手改進一下吧。

解決方案：

	public void saveInfo(Context context, String key, List> datas) {
		JSONArray mJsonArray = new JSONArray();
		for (int i = 0; i < datas.size(); i++) {
			Map itemMap = datas.get(i);
			Iterator> iterator = itemMap.entrySet().iterator();

			JSONObject object = new JSONObject();

			while (iterator.hasNext()) {
				Entry entry = iterator.next();
				try {
					object.put(entry.getKey(), entry.getValue());
				} catch (JSONException e) {

				}
			}
			mJsonArray.put(object);
		}

		SharedPreferences sp = context.getSharedPreferences("finals", Context.MODE_PRIVATE);
		Editor editor = sp.edit();
		editor.putString(key, mJsonArray.toString());
		editor.commit();
	}

	public List> getInfo(Context context, String key) {
		List> datas = new ArrayList>();
		SharedPreferences sp = context.getSharedPreferences("finals", Context.MODE_PRIVATE);
		String result = sp.getString(key, "");
		try {
			JSONArray array = new JSONArray(result);
			for (int i = 0; i < array.length(); i++) {
				JSONObject itemObject = array.getJSONObject(i);
				Map itemMap = new HashMap();
				JSONArray names = itemObject.names();
				if (names != null) {
					for (int j = 0; j < names.length(); j++) {
						String name = names.getString(j);
						String value = itemObject.getString(name);
						itemMap.put(name, value);
					}
				}
				datas.add(itemMap);
			}
		} catch (JSONException e) {

		}

		return datas;
	}