android SharedPreferances 纠正

网上的文章不要全信哦，也不要乱写，误人子弟

 

1.我看网上很多文章说SharedPreferances中存储的数据在不同包的Activity中无法读取。他指的是Context.MODE_PRIVATE这种模式下。

但是我测试了一下，在不同包的Activity中是可以读取SharedPreferances中的数据的。(Context.MODE_PRIVATE模式下 )

而且在官方的API文章中明确指出

 

Context类

public static final int MODE_PRIVATE

File creation mode: the default mode, where the created file can only be accessed by the calling application (or all applications sharing the same user ID).

See Also

• MODE_WORLD_READABLE
• MODE_WORLD_WRITEABLE

Constant Value: 0 (0x00000000)

2.不仅在不同包的Activity中可以读取SharedPreferances中的数据。不同应用也可以读取SharedPreferances中的数据

public static final int MODE_WORLD_READABLE

File creation mode: allow all other applications to have read access to the created file.

See Also

• MODE_PRIVATE
• MODE_WORLD_WRITEABLE

Constant Value: 1 (0x00000001)

public static final int MODE_WORLD_WRITEABLE

File creation mode: allow all other applications to have write access to the created file.

See Also

• MODE_PRIVATE
• MODE_WORLD_READABLE

Constant Value: 2 (0x00000002)

3.最后，SharedPreferances的本质就是xml文档，放在/data/data/<package name>/shares_prefs这个文件夹下