Question

为什么在以下示例中foo为false？

mPrefs = PreferenceManager.getDefaultSharedPreferences(this);
mPrefs.edit().putBoolean("myValue",true);
mPrefs.edit().commit();

boolean foo = mPrefs.getBoolean("myValue",false);

Answer 1

我认为你必须以这种方式写作

mPrefs = PreferenceManager.getDefaultSharedPreferences(this);
mPrefs.edit().putBoolean("myValue",true).commit();

boolean foo = mPrefs.getBoolean("myValue",false);

Answer 2

第一次拨打edit()时，您没有保存boolean，因此在检索时它不存在。

mPrefs = PreferenceManager.getDefaultSharedPreferences(this);
mPrefs.edit().putBoolean("myValue",true).commit();
boolean foo = mPrefs.getBoolean("myValue",false);

Answer 3

按---＆gt;存储您的值

SharedPreferences prefs =PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = prefs.edit();
editor.putBoolean("myValue",true);
editor.apply();

获得结果---＆gt;

SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
Boolean b = sharedPreferences.getboolean("myValue","");

Answer 4

您应Edit通过SharedPreference

Editor对象

SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putInt("Key", value);
editor.commit();

group by

Answer 5

在共享偏好设置中保存价值：

SharedPreferences settings =getSharedPreferences("AppName", 0);
            SharedPreferences.Editor editor = settings.edit();
            editor.putString(key, value);
    editor. putBoolean(key, value);
            editor.commit();

从共享偏好中获取价值：

  SharedPreferences settings = getSharedPreferences("AppName", 0);
            String value=settings.getString(key, ""); 
    boolean value=settings.getBoolean(key,false);

提交后，Android SharedPreferences为空

5 个答案: