Develop Reference

Flutter: How to create a folder at the root of the directory, i.e, not under any directory

I am developing a file based application through flutter.
I can create a folder through getApplicationDocumentsDirectory() which gives the path to write files. But it cannot be seen in the files Explorer
I then created the folder through getExternalStorageDirectory() , which can be seen in the files explorer. But I want it to be created in the root.
You may have seen whatsapp folder in the root directory. I also want the same thing. I have tried the following:
Directory('FolderName').create()
But it gives the error saying 'read only os '
Is there a way to do it through flutter ?

You can do it this way:
String folderName = "My New Downloads";
var path = "storage/emulated/0/$folderName";
await new Directory(path).create();

Can't locate application data on Android phone

I have spent many hours trying to find/create files for an app I am writing. When I pull the application directory name I get: /data/data/com.example.android.[myapp]/files. I am using File(getFilesDir():
File fileDir = new File(getFilesDir() + File.separator);
Log.i(TAG, "File directory: "+fileDir);
When I try to find this path I find many application folders here: Android/data/com but no /data/data folder under Android. There are many other application folders there but not mine. I see the same results whether I use Android Files app or Windows Explorer over USB. I've also tried to look using Eclipse DDMS tab. I see a data folder with a (+) to the left but when I click, it does not expand.
I have also tried creating the directory and file manually with Windows explorer and my app still can't find neither the Android/data/com.example... nor the Android/data/data/com.example... paths.
Also puzzling to me is when the app creates the path and file and write to it (using MODE_WORLD_WRITEABLE) I get no exceptions thrown but then I am unable to read it back or see it with either of the tools mentioned above. I have set the manifest permissions to WRITE_INTERNAL_STORAGE and WRITE_INTERNAL_STORAGE for the app.
Obviously, I am making a very basic mistake.
I am on Android 4.1.2 (API 16).
Sincerely,
ScratchingMyHead

To get the path of my application directory, Try this code sample
PackageManager m = getPackageManager();
String s = getPackageName();
try {
PackageInfo p = m.getPackageInfo(s, 0);
s = p.applicationInfo.dataDir;
} catch (NameNotFoundException e) {
Log.w("yourtag", "Error Package name not found ", e);
}

When I try to find this path I find many application folders here: Android/data/com but no /data/data folder under Android.
That is because you are looking on external storage, not internal storage where your files are. Use DDMS on an emulator to examine internal storage.
I've also tried to look using Eclipse DDMS tab. I see a data folder with a (+) to the left but when I click, it does not expand.
That would sound like what you will get when testing on hardware, as neither you nor DDMS have access to the contents of /data on production hardware.

Android: find a file created in AVD

My application has a function of creating an xls file. After that I need to access that file manually. Now, the problem is, when i run the app on my device, I am able to locate the directories and my xls file in internal storage.
But when I try to run that in the AVD, I am not able to find the file. I also viewed file explorer but there also, I wasn't able to find my file.
Where does the file exists when created in AVD?
Below is the code :
File myDir = new File(Environment.getExternalStorageDirectory()+ "/PB/automation/mydir/");
myFolder.mkdirs();
File file = new File(myFolder, "demo.xls");
Trust me, there is nothing wrong with the code.
Below is the file explorer view :

Android: Where are files saved?

I'm programming an app, which needs to store data in a textfile.
I'm using FileOutputStream:
outputStream = openFileOutput(filename, Context.MODE_PRIVATE);
outputStream.write(data.getBytes());
outputStream.close();
My question is: Where is the file saved?
I can't find it anywhere...
For debugging, I'm using a nexus7.

It's stored under /data/data/<your app> by default. But unless you have rooted device, you have no access to this folder from device. But you can take a look on your file by using DDMS from the Android SDK (at the android-sdk\tools folder)

If You are using Context.MODE_PRIVATE it is stored in application data directory and you do not have access to them from file manager

/data/data/your.app.package.name/files, but note this can be device dependent.. you can find it in eclipse by typing DDMS and then go to file explorer and then follow the above path

writes to a file in your internal directory
/data/data/pacakage/files

Adobe Air for Android: Where is a xml file after instalation .apk file

An Air app which loading data from an external XML file (cfg.xml). I've published the Android/Air file, included the cfg.xml file in the Android package. Then I've installed on my SD Card(). App's reading xml file - working perfectly. But I need raw access(on my device) to cfg.xml I cannot find this file, checked everywhere(Rooted Phone). Where is it? Is there other solution? I need a file which is easy to read/write.

Use DDMS -> File Explorer and look for you app name in folders like data, ...

Solution:
Use fileStream instead of URLLoader
Change directory to SD Card e.g.
File.userDirectory.resolvePath("YourAppData/cfg.xml")
(No rooted phone needed)