MODE_MULTI_PROCESS-优快云博客

本文深入探讨了Android Shared Preferences中多进程加载标志的用法及其在不同SDK版本中的变化，解释了其与并发读写操作的关系，并强调了在多进程应用中的重要性。

/**
     * SharedPreference loading flag: when set, the file on disk will
     * be checked for modification even if the shared preferences
     * instance is already loaded in this process. This behavior is
     * sometimes desired in cases where the application has multiple
     * processes, all writing to the same SharedPreferences file.
     * Generally there are better forms of communication between
     * processes, though.
     *
     * <p>This was the legacy (but undocumented) behavior in and
     * before Gingerbread (Android 2.3) and this flag is implied when
     * targetting such releases. For applications targetting SDK
     * versions <em>greater than</em> Android 2.3, this flag must be
     * explicitly set if desired.
     *
     * @see #getSharedPreferences
     */

public static final int MODE_MULTI_PROCESS = 0x0004;

看到settingManager在载入sharedPref时，getSharedPreferences()会使用这个标记，其实作用和C的violate有点像，

及该prefs在读入到内存以后，也有可能被其他的进程改变，那么，对与prefs的每次修改都要做出回应，适用于多进程。

这个行为在2.3以前是默认，后面要用必须显式的加上，估计是为了性能吧.