arrayList 를 SharedPreference에 save, get 하기

arraylist 를 json을 이용해 sharedpreference에 넣고 가져 옴

String, Integer, boolean

 

refer to GXCount.app

    void setStringArrayPref(String key, ArrayList<String> values) {
        SharedPreferences.Editor editor = sharedPreferences.edit();
        JSONArray a = new JSONArray();
        for (int i = 0; i < values.size(); i++) {
            a.put(values.get(i));
        }
        if (!values.isEmpty()) {
            editor.putString(key, a.toString());
        } else {
            editor.putString(key, null);
        }
        editor.apply();
    }

    ArrayList<String> getStringArrayPref(String key) {
        String json = sharedPreferences.getString(key, null);
        ArrayList<String> urls = new ArrayList<>();
        if (json != null) {
            try {
                JSONArray a = new JSONArray(json);
                for (int i = 0; i < a.length(); i++) {
                    String url = a.optString(i);
                    urls.add(url);
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        return urls;
    }

    void setIntegerArrayPref(String key, ArrayList<Integer> values) {
        SharedPreferences.Editor editor = sharedPreferences.edit();
        JSONArray a = new JSONArray();
        for (int i = 0; i < values.size(); i++) {
            a.put(values.get(i));
        }
        if (!values.isEmpty()) {
            editor.putString(key, a.toString());
        } else {
            editor.putString(key, null);
        }
        editor.apply();
    }

    ArrayList<Integer> getIntegerArrayPref(String key) {
        String json = sharedPreferences.getString(key, null);
        ArrayList<Integer> urls = new ArrayList<>();
        if (json != null) {
            try {
                JSONArray a = new JSONArray(json);
                for (int i = 0; i < a.length(); i++) {
                    int url = a.optInt(i);
                    urls.add(url);
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        return urls;
    }

    void setBooleanArrayPref(String key, ArrayList<Boolean> values) {
        SharedPreferences.Editor editor = sharedPreferences.edit();
        JSONArray a = new JSONArray();
        for (int i = 0; i < values.size(); i++) {
            Log.w(key+i,""+values.get(i));
            a.put(values.get(i));
        }
        if (!values.isEmpty()) {
            editor.putString(key, a.toString());
        } else {
            editor.putString(key, null);
        }
        editor.apply();
    }

    ArrayList<Boolean> getBooleanArrayPref(String key) {
        String json = sharedPreferences.getString(key, null);
        ArrayList<Boolean> urls = new ArrayList<>();
        if (json != null) {
            try {
                JSONArray a = new JSONArray(json);
                for (int i = 0; i < a.length(); i++) {
                    boolean url = a.optBoolean(i);
                    urls.add(url);
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        return urls;
    }

 

    void setIntArrayPref(String key, ArrayList<Integer> values) {
        SharedPreferences.Editor editor = mSettings.edit();
        JSONArray a = new JSONArray();
        for (int i = 0; i < values.size(); i++) {
            a.put(values.get(i));
        }
        if (!values.isEmpty()) {
            editor.putString(key, a.toString());
        } else {
            editor.putString(key, null);
        }
        editor.apply();
    }

    ArrayList<Integer> getIntArrayPref(String key) {
        String json = mSettings.getString(key, null);
        ArrayList<Integer> urls = new ArrayList<>();
        if (json != null) {
            try {
                JSONArray a = new JSONArray(json);
                for (int i = 0; i < a.length(); i++) {
                    int url = a.optInt(i);
                    urls.add(url);
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        return urls;
    }

 

Class Array 통채 save, read

    void saveSharedPrefTables() {

        sharedPreferences = PreferenceManager.getDefaultSharedPreferences(mContext);
        SharedPreferences.Editor prefsEditor = sharedPreferences.edit();
        Gson gson = new Gson();
        String json = gson.toJson(metros);
        prefsEditor.putString("metroInfo", json);
        prefsEditor.apply();
    }

    ArrayList<Metro> readSharedPrefTables() {

        ArrayList<Metro> list;
        sharedPreferences = PreferenceManager.getDefaultSharedPreferences(mContext);
        Gson gson = new Gson();
        String json = sharedPreferences.getString("metroInfo", "");
        if (json.isEmpty()) {
            list = new ArrayList<>();
        } else {
            Type type = new TypeToken<List<Metro>>() {
            }.getType();
            list = gson.fromJson(json, type);
        }
        return list;
    }