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();

In a react-native android project,How to copy a folder from assets to the DocumentDirectoryPath?

I am using a react-native project in which,I want to copy the contents of a certain folder in assets inside android to RNFS.DocumentDirectoryPath. How can this be performed?
I have used the attribute copyFileAssets().
copyfile() {
RNFS.copyFileAssets('/ICF-Package', RNFS.DocumentDirectoryPath + '/ICFPackage').then((result) => console.log('DONE')).catch((error) => console.log(error, 'ERROR'));
};
I'm getting the following error:
Error: Asset '/ICF-Package' could not be opened

Your code is correct. However, it looks like /ICF-Package is a folder or something, but not a file. copyFileAssets can only copy files, but no folders (and its content)

Assets Folder Not Including HTML Files In NativeScript Android Build

I am trying to display a local html file with JS and CSS and PNG images referenced by it. I put the files into my assets folder of a NativeScript x Angular app for Android. When I run tns run android --bundle and the app gets built - the assets folder does not include the html. Folder structure goes from assets > index.html (and index.html references the other files).
Is there a certain place or way I need to include html files so they get included in the build?

You must update CopyWebpackPlugin in your webpack.config.js to include the asset folder
// Copy assets to out dir. Add your own globs as needed.
new CopyWebpackPlugin([
{ from: "fonts/**" },
{ from: "**/*.jpg" },
{ from: "**/*.png" },
{ from: "assets/**" }, // Add your asset folder path like this
], { ignore: [`${relative(appPath, appResourcesFullPath)}/**`] }),

Deleting file from internal storage

How do I delete a file or folder on the internal storage in android with Delphi for android

You should use the TFile and TDirectory classes in the System.IOUtils unit.
For example:
TDirectory.Delete(<YOUR DIR PATH>);
or
TFile.Delete(<YOUR FILE PATH>);
Look in Embarcadero's documentation to get the right path of your files and folders on the various platforms:
Standard RTL Path Functions across the Supported Target Platforms

Referred from :
https://stackoverflow.com/a/27047502/5193608
https://stackoverflow.com/a/3554949/5193608
Main Part from both links:
You should always delete files that you no longer need. The most straightforward way to delete a file is to have the opened file reference call delete() on itself.
myFile.delete();
If the file is saved on internal storage, you can also ask the Context to locate and delete a file by calling deleteFile():
myContext.deleteFile(fileName);
Note: When the user uninstalls your app, the Android system deletes the following: All files you saved on internal storage All files you saved on external storage using getExternalFilesDir(). However, you should manually delete all cached files created with getCacheDir() on a regular basis and also regularly delete other files you no longer need.
Source : http://developer.android.com/training/basics/data-storage/files.html
Directly you can do is :
File dir = getFilesDir();
File file = new File(dir, "my_filename");
boolean deleted = file.delete();
Hope,it helps!

Android unity3d image path

I am trying to get an instance of an image in Unity that is in:
/assets/texture/image.png
Here is what I did:
path = Application.persistentDataPath;
path2 = Application.dataPath;
path3 = Application.streamingAssetsPath;
iTextSharp.text.Image imageHeader = iTextSharp.text.Image.GetInstance("jar:file://" + path2 + "!/assets/texture/image.png");
I did try with all the paths, and I am getting:
NotSupportedException:
jar:file:/data/app/com.myapk!/assets/texture/image.png.
Any help?

To access a file in the assets folder of your apk:
String path = getAssets() + "/texture/image.png";
iTextSharp.text.Image imageHeader = iTextSharp.text.Image.GetInstance(path);
The path should be something like:
file:///android_asset/texture/image.png
EDIT: Can't use getAssets in Unity - Then there will not be a direct system-mounted file path for files in the assets folder.
What I usually do for C++/NDK applications with graphical assets is to decompress the assets directory to the SDCard to have a direct path access. On first launch of the app, you extract your assets folder to /mnt/sdcard (getExternalStorageDirectory) then use that. Otherwise I have no Idea how to do it in Unity directly, but there must be something.

If you want to make this easy on yourself, put your texture in the Resources/ folder and use Resources.Load to load it. Or put it in StreamingAssets/ and use the WWW class to load if from the jar file.