Question

我的应用程序用于安全目的。因此, 从我的应用程序用户捕捉照片中, 所有的照片都存储在文件夹中, 文件夹不应该从任何其他应用程序中访问, 而当设备连接到计算机系统时, 不应该给予访问权限。如果用户想要查看这些图像, 他应该只访问我的应用程序。

Answer 1

According to this guide, you can save files directly on the device s internal storage. By default, files saved to the internal storage are private to your application and other applications cannot access them (nor can the user). When the user uninstalls your application, these files are removed. For example:

String FILENAME = "hello_file";
String string = "hello world!";
FileOutputStream fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);
fos.write(string.getBytes());
fos.close();

MODE_ PRIVATE 将创建文件( 或替换一个同名文件), 并将它变成您的应用程序的私有文件。其他模式有: MODE_ APPEND、 MODE_ WORLD_ READADW、 MODE_ WORLD_ RWYITEB 。

Answer 2

AFAIK 的唯一途径是 < code> encrypt 您存储的文件。无法阻止用户挂载 spdcard 访问存储的文件。

Answer 3

根据这个相关的问题,您只能在内部存储(不是在SD上)中创建受保护的文件...

< a href=>> 创建无法为任何其他应用程序访问的文件夹

Answer 4

尝试以下解决方案 :

< a href=> https://stackoverflow.com/ questions/5482639/how-to-store- a-file- in-hidden-mode> 如何以隐藏模式存储文件

虽然这并不是你想要的,我怀疑它是否可行。最好的选择是隐藏它,但同时也是有限制的(Linux而不是Windows的工作,还有其它应用程序可以访问文件夹)

< a href=> https://stackoverflow.com/ questions/8149103/how-to- hide- the- folder-of- sdcard- in-and-and-and-and-roid" > 如何将牌文件夹隐藏在和移动

"https://stackoverflow.com/ questions/112964/ how-to-make-a file-hidden- in-android-sd-card" 如何将文件隐藏在机器人牌中?

Answer 5

Its not possible to give no access to that folder when device connected to pc.. Also its not possible on sdcard also, But you can use different format for images that can be opened only from your application, or you can encrypt images. Or if you want to hide images from showing them into gallery, you can put a blank file with name as ".nomedia" in your folder. But its not possible cause if u read docs about WRITE_EXTERNEL_STORAGE permission you will understand what I am saying. :)

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