everyone,
I want to build an app scanning all the files in the devices, so I have to access root directory ("/"), but the file.listfile returns NULL. Is there any way to access "/"?
Because you are using the system in a non-root account, whose allowed reading directories are limited. Directory in "/" are only available for root users. However, due to security concerns, root privilege are generally not accessible for third-party installed apps, in case the installed app may modify system level codes to do bad things.
You may get further information from here
That is pretty strange as on an Android 5.1 device it should just do the listing. No root needed.
Also on Android 6 this works on all devices i know.
It only started with Android 7 that "/" is not listable anymore.
Which device is it?
Related
I recently bought a Samsung Galaxy S20 FE with Android 12, and I quickly noticed that many applications were unable to access files on the SD card. For instance, I used to access local HTML/MP3 files from different browsers or music players. On my new system, these applications can see folders and navigate through them, but can not open or even list any regular file. There is a few exceptions, e.g Total Commander or AIMP.
From what I understood, this is a policy change from Google which appeared on Android 11 (API/SDK 30): https://www.xda-developers.com/android-11-all-files-access-permission-form/
I tried a few solutions I could find online, for instance:
pm grant com.XXX.YYY android.permission.MANAGE_EXTERNAL_STORAGE
appops set --uid com.XXX.YYY android:legacy_storage allow
This is not working because, probably, the application (i tried with Opera) is not requesting this permission during the installation. Also, most of the solutions I could find are related to apps under development, not apps installed from the store. E.g. : Android 11 Scoped storage permissions
A workaround I could find is to move all the files in /storage/SD_CARD_ID/Android/data/com.XXX.YYY/files, however, this means that I have to copy these files each time I install a new app and for each app I use, which is quite stupid if I have GB's of MP3 or other media. This is also quite tedious to enter the full path in the URL bar as it is not possible to navigate to or open this folder easily.
I am therefore trying to find a way to enable the permission by default for all apps, or at least find a simple way to do it via the GUI. For instance, I tried to tweak /etc/permissions/platforms.xml with some more or less random tries as I could not find any documentation about the syntax of this file, but nothing worked.
Note that my phone is rooted.
I'm facing an issue trying to get the app root folder, the problem comes in an emulator with Marshmallow. When I do context.getFilesDir() it returns a wrong path:
data/user/0/com.android.appname/files/
When it should be:
data/data/com.android.appname/files/
Somebody know why is this happening and how to solve it or another way to get the right path to the app root folder?
/data/user/0/com.android.appname/files/ is a perfectly valid path to be returned by getFilesDir(). That directory will be usable by your app.
adb is not your app. Its view of the filesystem will be different.
The exact location of where getFilesDir() maps to on the actual filesystem — or where tools like adb will see it — will vary based on several criteria, including OS version, which user account is running your app (remember: Android supports multiple users!), and possibly device manufacturer/custom ROM changes.
I am working on a android app and i want the user to be able to view the folders that require root access. I tried looking through the Cyanogenmod file manager code to try and trying the su command in java with the Runtime thing, but I had no luck.
You cannot do this without rooting the device (which simply means gaining required root access level). That's basically the reason for permission system - to keep you away from the places you should not be looking in.
I have a Google Nexus 7, and I've been developing on it. Only recently, however, have I become unable to access the /data/ directory using the file browser in eclipse. The device was never rooted, but now since I upgraded it, I believe that I have lost access to this. Is there any way to get eclipse to use the "run-as" command to access my app's data directory? How come I have suddenly lost access to this?
Is the only option left to root the device?
Thanks
Is there any way to get eclipse to use the "run-as" command to access my app's data directory?
There is nothing for you to run "as" that would help here, AFAIK.
How come I have suddenly lost access to this?
You should not have had access to it in the first place. If you did, that was a security flaw in the device, perhaps fixed by a firmware upgrade.
Is the only option left to root the device?
You could not browse the /data/ directory on production hardware. For example, you can browse /data/ on the emulator.
I am able to given root permission by installing apk.
http://gadgets.ndtv.com/mobiles/features/how-to-root-nokia-x-and-get-access-to-google-play-store-and-google-now-508391
I'm developing an app that (I believe) needs root privilege. There are plenty of instructions on the web for rooting a phone. My questions is:
If I root my phone, do all apps get root privelege automatically, e.g. a File Manager or ADB?
(I'm familiar with root privelege on desktops, but Android is a different animal).
A previous answer from "Ali" said to "acesss [the app] in SuperUser". I'm not sure what that means. Do I have to mod my app? Do I launch it differently? or what?
Yes If you access File Manager or ADB in Super User.
even you root your phone.the applications do not have root pemission excepts doing something
special.