android 12 /mnt/media

现象

storage下可读取，但/mnt/media_rw不可读取

结论

1 base/core/res/AndroidManifest.xml
–安卓12
-----已替代android.permission.WRITE_MEDIA_STORAGE
安卓新版本适配是真谛烦 =。=

<!-- @SystemApi @TestApi Allows an application to write to internal media storage
     @deprecated This permission is no longer honored in the system and no longer adds
     the media_rw gid as a supplementary gid to the holder. Use the
     android.permission.MANAGE_EXTERNAL_STORAGE instead.
     @hide  -->
<permission android:name="android.permission.WRITE_MEDIA_STORAGE"
    android:protectionLevel="signature|privileged" />

2 framework/base/data/etc/platform.xml
看情况是否需要添加此处，否则media_rw权限不可读

<permission name="android.permission.WRITE_MEDIA_STORAGE" >
    <group gid="media_rw" />
    <group gid="sdcard_rw" />
</permission>