Mar 04, 2020 The driver will help you access files on Android from PC. Here I take Samsung Kies and HTC Sync Manager as examples to talk through the instructions. Samsung Kies; 1. Visit Samsung official website to download Kies. Install and launch it 3. Open the USB debug mode of your phone and then plug in the USB cable to access Android phone from PC. BTW, Foxit on Android seems to somehow be able to access the comments from the hidden Reader file. I had another copy of the file on the SD Card containing the uncommented file. Opening this file in Reader caused it to save the file in the hidden location.
Thanks for provide the useful info backup from entire android device, I found and analyze Android data is not completely safe on the computer, SD cards, or other external media. The data files may get unusable due to corruption in the drive. It can be also wiped off due to deletion, formatting, virus infection, hardware damage, etc. How to Use Android’s Built-in File Manager. Browse the file system: Tap a folder to enter it and view its contents. Open files: Tap a file to open it in an associated app, if you have an app that can open files of that type on your Android device. Select one or more files: Long-press a file. Download Diskinternals Linux reader and open it up. Step 2) Download sgs2ext4.jar and open it up. Step 3) Take you system.img and move it into the sgs2ext4.jar application and wait until it is done. Step 4) Now you should get a system.img.ext4 file or something like that just make sure ext4/ext is in the name Step 5).
![File File](https://st.drweb.com/static/new-www/news/2020/january/android.xiny_3.png)
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The Device File Explorer allows you to view, copy, and delete files on anAndroid device. This is useful when examining files that are created by your appor if you want to transfer files to and from a device.
Note: Most device data is not visible unless you are using a rooted device or anemulator with a standard Android (AOSP) system image (not one of the Google APIsor Google Play system images). And when using a connected device, be sure youenable USB debugging.To work with a device's file system, proceed as follows:
- Click View > Tool Windows > Device File Explorer or click theDevice File Explorer button in the tool window bar to open the Device File Explorer.
- Select a device from the drop down list.
- Interact with the device content in the file explorer window. Right-click on a file or directory to create a new file or directory, save the selected file or directory to your machine, upload, delete, or synchronize. Double-click a file to open it in Android Studio.Android Studio saves files you open this way in a temporary directory outside of your project. If you make modifications to a file you opened using the Device File Explorer, and would like to save your changes back to the device, you must manually upload the modified version of the file to the device.
Figure 1. The Device File Explorer tool window
When exploring a device's files, the following directories are particularlyuseful:
data/data/app_name/
- Contains data files for your app stored oninternal storage
sdcard/
- Contains user files stored onexternal userstorage (pictures, etc.)
Note: Not all files on a hardware device arevisible in the Device File Explorer. For example, in the
data/data/
directory, entries corresponding to apps on the device that are not debuggablecannot be expanded in the Device File Explorer.From Free Knowledge Base- The DUCK Project: information for everyone
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Microsoft Windows users are familiar with the terms FAT32, or NTFS, which refers to types of file systems. Android devices are developed on Linux, which is based on UNIX. Linux users are familiar with good old ext2 file system. Well, your Android device may use an updated Linux file system, such as ext4, or a proprietary file system by a manufacturer, depending on who made the device and and what has been done to it by the user.
Samsung Galaxy S phones use the Samsung RFS proprietary file system while the Samsung Nexus S with Android 2.3 uses the Linux Ext4 file system. The new open standard Ext4 file system seems to be the popular standard. Android phones use the Linux kernel, and as many linux users know, linux can support a large number of operating systems.
The SDCard may be formatted ext3 or YAFFS, or ext4.
In December 2010 it was announced 'Ext4 filesystem hits Android,' Google's new Nexus S smartphone is the first Android device to use the Ext4 filesystem. Ext4 developer Ted T'so claims it is less prone to data loss. Previously, most Androids used YAFFS, a lightweight filesystem that is optimized for flash storage and is commonly used in mobile and embedded devices.
Ext4 is considered a breakthrough for Android devices, with increased data integrity and quicker data read/write access.
- 1File System Overview
File System Overview
The file system structure of Android devices shares some similarities with Linux, and has some peculiar traits unique to Android.
Many applications search the entire sdcard for data files, for example, a common music player will search the entire SD Card for all audio files, including .mp3 files. Daily 1 7 1 – time tracking for professionals. This can be undesirable for (a) purists that wish to have certain files for certain purposes in specific organized and standardized places and (b) people that have audio files in certain folders they do not want showing up in the new media player just installed.
It is true that Android blows away file system and storage convention, by trying to make it seem as if there is no need for structure of the file system. The design is supposed to be a 'stick it in and it just finds the stuff and works' designed for the lowest common denominator. Unfortunately, a lot of technology is heading down this zombie minded road.
Linux users are also familiar with partitions versus directories. Some directories visible via the file manager (or ls command on linux) may be mounted partitions. A good article reference to read is: Android Partitions Explained: boot, system, recovery, data, cache & misc by an author named By Haroon Q. Raja.
Hiding Media Files
If you have a folder with files, such as .mp3 files, and you don't want them to appear to applications that scan the entire card contents, just put a .nomedia file in the folder and it wont see them. Save a null file as “.nomedia” and make sure that the Save as type is set as “All Files” instead of “Text documents.” Copy that file to the folder on your SD card containing audio files you don’t want to show up. You may have to reboot the Android after doing this.
Also, any folder whose name begins with a period, such as .secretmedia, will be invisible to scanning software also. A folder beginning with a period in the Linux / Android world is like a folder with the hidden attribute set in the Windows world.
The Linux console command to quickly create the null .nomedia file is:
SDCard
The mounted SDCard is a storage device mounted to the file system in the typical Linux fashion. On the file system root the /sdcard is a symbolic link to /mnt/sdcard. /mnt/sdcard is where the SD card is actually mounted, but the same files can also be accessed in /sdcard.
- /mnt/sdcard --- Your removable SD card data is stored here.
The Samsung Galaxy Tab 2 actually has two SDCard mounts, one for a built-in internal SDCard which is different than the device memory on a typical Android phone, and the second is the removable SDCard.
- /mnt/extSdCard --- On the Samsung Galaxy 2 tablet this is the removable SD card.
Every Android-compatible device supports a shared 'external storage' that you can use to save files. This can be a removable storage media (such as an SD card) or an internal (non-removable) storage. Files saved to the external storage are world-readable and can be modified by the user when they enable USB mass storage to transfer files on a computer.
DCIM
- typically /sdcard/DCIM or /DCIM
File System Fat16
Android uses the DCF (Design rule for Camera File system) specification. All digital cameras contain a DCIM (Digital Camera IMages) folder in their root directory. Inside this will be multiple folders named nnnABCDE, where nnn is a unique directory number between 100-999 and ABCDE is a five-character alphanumeric string often (but not required to be) related to the camera manufacturer. Image files stored within these folders will have a file name in the format ABCDnnnn, where ABCD is a four-character string (often DSC_ or IMG_) and nnnn is a unique sequential index number.
External Storage Public Directory
Open File System Android Player
Android developer's reference explains that there are certain public storage directories that are not specifically tied to a specific program. So if a program is uninstalled, it should never remove data from one of these standard public storage directories. These directories lay at the root of the external storage, such as Music/, Pictures/, Ringtones/, and others.
- Music/ - Media scanner classifies all media found here as user music.
- Podcasts/ - Media scanner classifies all media found here as a podcast.
- Ringtones/ - Media scanner classifies all media found here as a ringtone.
- Alarms/ - Media scanner classifies all media found here as an alarm sound.
- Notifications/ - Media scanner classifies all media found here as a notification sound.
- Pictures/ - All photos (excluding those taken with the camera).
- Movies/ - All movies (excluding those taken with the camcorder).
- Download/ - Miscellaneous downloads.
So an example would be /mnt/sdcard/Pictures which is made up of the first part, /mnt/sdcard (or just /sdcard) that being the root of the sdcard and then one of the directories above.
App Installation path
Preinstalled applications are in /system/app folder. User installed applications are in /data/app
- /data/app
- /data/app-private
- /system/app/
- /sdcard/.android_secure (shows .asec files, not .apks) On Samsung phones: /sdcard/external_sd/.android_secure
In Android 7.0 and before, after an APK is installed, it will be located in /data/app path.
In Android 7.0, the APK file will be installed into the /data/app/<package name>-<num>/ folder, where the <package name> is the package name of the APK, and the num may be 1 or 2.
File System Tree
![Android Android](https://www.xda-developers.com/files/2018/09/System-Tracing-on-Android-Pie.png)
Since Android is a Linux-based operating system for smartphones and tablets it shares the basic Linux 'like' file system structure. Purists will argue that Linux is a kernel, not a file system structure, but people get the point. Android runs on top of a standard Linux kernel, and uses many of the same kernelspace utilities. The directory structure of Android looks similar to the directory structure of common Linux distributions. Android utilizes certain conventions providing uniformity in partitions versus directories on a partition. There are mainly 6 partitions in Android phones, tablets and other Android devices: boot, system, recovery, data, cache, misc.
Click on a folder for details on purpose.
Can Android Open Pdf File
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