Open File System Android

Change Default Application for File Types in Android Phone. Listen up Android users, if you have set a mistakenly default app to open a particular file type and want to undo the action, here’s. Jun 04, 2020 Explore your Android's system files. You can browse through your Android's files and folders like usual, but you should now see system files and folders included in ES File Explorer. Any folders that are a lighter color than your Android's standard folders are root folders.

  1. Open File System Android Operating System
  2. Android File System Pdf
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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. 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.
Open

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

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

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

  1. /data/app
  2. /data/app-private
  3. /system/app/
  4. /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

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.

Keywords: Android Tablet PC Samsung Galaxy Tab Two 2 FS File System Root Linux

Retrieved from 'http://wiki.robotz.com/index.php?title=Android_File_System&oldid=18703'

Just like in Windows, we have multiple software to open a particular file type, we have a number of apps in Android to take care of a single file type. For example, we can have multiple audio/video players installed on the Android device that can play all types of media files.

Google Play Store has a plethrora of applications to better open different media files. Be it a new app to make calls, your new web browser, a swift messaging app or a swanky music player — an Android user is always on the lookout for a new app to adorn his or her home screen.

Now, let’s say you use different apps to play videos and listening to music but you accidentally hit Set default and created default action to use a player to play all the media files.

When you choose an app to be the default application to open a particular file type, it will do so whenever any third-party app is trying to access that particular file type as part of the default settings.

Other Stories: 9 Cool Tips and Tricks for Multiple Monitors on Windows 10

Change Default Application for File Types in Android Phone

Listen up Android users, if you have set a mistakenly default app to open a particular file type and want to undo the action, here’s what to do.

Step 1:

Open Android Apps settings. Android Ice Cream Sandwich (ICS) users can open Settings > Apps while the former builds can open Settings > Application > Manage applications.

Different versions of Android may also show different names of the tabs mentioned above. So, whether you are stuck with Android Marshmallow or are more upbeat Android Nougat, these instructions may vary.

Note
: This path might be different in the cases of some mobile brands such as Samsung, Huawei, and etc. Android users using Samsung Galaxy devices should look for the Applications option in Settings rather than Apps.

Step 2:

Now search for the app you want to change the default settings for and tap on the app settings to open the info page of that application.

Open File System Android Operating System

Step 3:

Android File System Pdf

Scroll down the page to find the button Clear defaults. If the app is a default app for any of the file type on your device, the button will be enabled, otherwise disabled. Simply tap on the button to clear all the files associated with the app.

That’s All, Folks!

Next time you try to open the same file type, you will get all the suggestions to choose from again. Just make sure you make the right decision this time.


The above article may contain affiliate links which help support Guiding Tech. However, it does not affect our editorial integrity. The content remains unbiased and authentic.Read NextES File Explorer Pro vs Solid Explorer: The Duel for the Best Android File ManagerAlso See#Android apps #Tips & Tricks

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