两个可能会常常用到的简便方法

 1 private final String spName = BuildConfig.APPLICATION_ID + BuildConfig.VERSION_CODE;
 2 public List<T> getList() {
 3　　SharedPreferences sp = getSharedPreferences(spName, Context.MODE_PRIVATE);
 4　　List<T> list = new ArrayList<>();
 5　　String strJson = sp.getString(TAG, null);
 6　　if (null == strJson) {
 7　　　　return list;
 8　　}
 9　　Gson gson = new Gson();
10　　list = gson.fromJson(strJson, new TypeToken<List<T>>() {
11　　}.getType());
12　　return list;
13}
14 
15public void setList(List<T> list) {
16　　if (list == null || list.size() == 0) {
17　　　　return;
18　　}
19　　SharedPreferences sp = getSharedPreferences(spName, Context.MODE_PRIVATE);
20　　SharedPreferences.Editor editor = sp.edit();
21　　Gson gson = new Gson();
22　　String strJson = gson.toJson(list);
23　　editor.clear();
24　　editor.putString(TAG, strJson);
25　　editor.apply();
26}

public static String getAppString(int resId, Object... args) {
        if (resId == 0) {
            return " ";
        }
        try {
            CharSequence text = getInstance().getResources().getString(resId, args);
            if (!TextUtils.isEmpty(text)) {
                return text.toString();
            } else {
                return " ";
            }
        } catch (Exception e) {
            return " ";
        }
    }

textView.setText(App.getAppString(R.string.text, string1, string2, …)