Android：无法从设备访问 SD 卡文件
我正在开发一个 Android 应用程序，它可以从 SD 卡写入和读取 .PNG 文件。我已经在设备（htc）上尝试过它并且工作正常。然后我必须修改一些代码来纠正一些错误（请注意，所做的更改与保存/打开功能无关）。但现在就像这样我无法再在 SD 卡上保存/打开文件。
我尝试在 DDMS 文件资源管理器视图 (eclipse) 中打开 sdcard 文件夹，但它显示为空，并且权限为 d---------。我认为这与权限有关，但我不知道到底是什么导致了这个问题以及如何解决它。
为了查看问题是否出在我的应用程序中，我在模拟器上对其进行了测试，并且工作正常。所以问题肯定与设备有关。
有什么建议吗？
I'm working on an android app that writes and reads .PNG files from sdcard. I've already tried it on a device (htc) and it was working fine. Then I had to modify some code to correct some errors (Note that changes made had nothing to do with save/open function). But now just like that I can no longer save/open files on sdcard.
I've tried to open sdcard folder in DDMS File Explorer view (eclipse) but it appears empty and the permissions are d---------. I think it has something to do with the permissions but I have no idea what exactly is causing this problem and how to solve it.
To see if the problem was in my app I tested it on an emulator and it's working fine. So the problem is definitely related to the device.
Any suggestions?
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确保您没有在“磁盘驱动器”模式下将手机连接到电脑。
Make sure you didn't connect the phone to your PC in "disk drive" mode.
我记得为了能够使用 ddms 查看某些目录的内容，您需要 root 手机才能获得权限。
I recall that in order to be able to view contents of certain directories with ddms you need to have rooted your phone to get the permissions.