SAF | Simple Archive Format - A minimal, stream-friendly format for file/object archiving | Continuous Backup library

I have two files

File_A.txt

I have a multi line text from where i want to match the text between the word "Description Amount" and a random digit with commas as delimiter.
Example Input:

There are various storage restrictions on Android 10 and 11, which also includes a new permission (MANAGE_EXTERNAL_STORAGE) to access all files (yet it doesn't allow access to really all files ) while the previous storage permission got reduced to grant access just to media files :

1. Apps can reach the "media" sub folder freely.
2. Apps can never reach "data" sub folder and especially the content.
3. For "obb" folder, if the app was allowed to install apps, it can reach it (to copy files to there). Otherwise it can't.
4. Using USB or root, you could still reach them, and as an end user you can reach them via the built-in file-manager app "Files".

I've noticed an app that somehow overcome this limitation (here) called "X-plore": Once you enter "Android/data" folder, it asks you to grant access to it (directly using SAF, somehow), and when you grant it, you can access everything in all folders of "Android" folder.

This means there might still be a way to reach it, but problem is that I couldn't make a sample that does the same, for some reason.

It seems this app targets API 29 (Android 10), and that it doesn't use the new permission yet, and that it has the flag requestLegacyExternalStorage. I don't know if the same trick they use will work when targeting API 30, but I can say that on my case, running on Pixel 4 with Android 11, it works fine.

So I tried to do the same:

1. I made a sample POC that targets Android API 29, has storage permissions (of all kinds) granted, including the legacy flag.

2. I tried to request access directly to "Android" folder (based on here), which sadly didn't work as it goes to some reason (kept going to DCIM folder, no idea why) :

I have the following entity:

I have two Uri from different files with schema "content" obtained by the Android SAF API and I need to copy exif information from one file to the other. The destination file was created by my app so I have granted write access to it.

With the ContentResolver I can obtain an InputStream that I can use to instantiate an ExifInterface from wich I can extract the exif from the source Uri:

I'm looking forward to build a File Explorer app but I'm shocked with what I found on I do need full read/write permission and access to everything.

So as they state here:

Declare the MANAGE_EXTERNAL_STORAGE permission in the manifest.

Use the ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION intent action to direct users to a system settings page where they can enable the following option for your app

To determine whether your app has been granted the MANAGE_EXTERNAL_STORAGE permission, call Environment.isExternalStorageManager().

Now I can access to the root folder "/storage/emulated/0/" via Environment.getExternalStoragePublicDirectory(path) and then file.listFiles()

But when I want to access to Downloads folder I can't, I've looked at SAF but I'd have to use like ACTIONS and I just want to explore through folders, then I looked at MediaStore but there's not a clear example of how I could use it here since I'm trying to get the files but cursor.moveToNext() or cursor.moveToFirst() returns false

Here's the code I've used

I am using the Storage Access Framework in android for selecting images and uploading in my app. Before uploading these images to my server, i also process these images (resizing). However, in the URI returned by the SAF, there is no extension appended, i don't know how to get extension of the file. I need to differentiate between png and jpeg. How can i achieve that ? Example uri returned from SAF - content://com.android.providers.media.documents/document/image%3A245309

My code is something like this

I'm trying to save a text file using SAF (Storage Access Framework) but I can't control where it should be saved, I used this method from the Documentation as follows:

I am developing a food cart function where I am adding products to the cart. My cart is an Array type and the product is an object with key-values. The problem I am facing is, whenever I am trying to add a new product with a different value for a similar key, it overwrites the value of the same key for the old product as well. As per my understanding, an array is just a reference pointing to my product object but I want to know, what is the best method to resolve this issue? Here is how my code structure looks like:

component.ts