Develop Reference

Create a file folder for app

The below code doesn't create a folder in my device.
String intStorageDirectory = context.getFilesDir().toString();
File folder = new File(intStorageDirectory, "test");
folder.createNewFile();;
I need a folder created for my app to store media, when user installs it. That folder should be visible on file explorer. How can i do it?

With the current snippet you created a file, you can also create folder by creating file but your current directory is the base folder, getFilesDir() points internal storage for your app which not visible nor accessible unless explicitly declared. You can create a folder and file by creating with new File().createNewFile() or create only folder using mkdirs() but you won't be able to display it using a file explorer app and that folder and files inside it will be deleted when/if user uninstalls your app.
To save files externally(This doesn't mean saving to SD Card) you can create directory and file with
File mediaStorageDir = new File(Environment.getExternalStorageDirectory(), folderName);
if (!mediaStorageDir.exists()) {
mediaStorageDir.mkdirs()
}
File mediaFile = new File(mediaStorageDir.getAbsolutePath() + File.separator + fileName);
And you need some kind of OutputStream to write data to that file.
Make sure that you ask <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> inside your AndroidManifest.xml file and ask write permission on runtime if your android:targetSdkVersion="23" or above

new File(context.getFielsDir(), "test").mkdirs();
createNewFile creates a file, not a folder. Using mkdirs instead of mkdir ensures that all parents exist. There's also no reason to go through a string when you already have a File.

Adding folder.mkdirs(); should work in place of folder.createNewFile(); And don't forget to add the permissions.
This will create a folder in you data directory.
And just a suggestion , if you want to store media in a SD card folder maybe Environment.getExternalStorageDirectory() is good.

Get preloaded file in android

I'm new to android development and I am working on a little project. What I am having some issue with is getting access to preloaded files.
In my app, I have an XML file that I preloaded (I just simply put it in my src folder in a package). How do I access them in my classes? I need to get a File object pointing to this file so that I can use it as I would I/O files. It seems like this should be trivial, but alas I am stuck.
Lets say the file is located under: com.app.preloadedFiles/file1.XML
I've tried something along the lines of this, but have had no success:
URL dir_url = ClassLoader.getSystemResource("preloadedFiles/file1.XML");
FIle file = new File(dir_url.toURI());

I solved this in my app by getting an InputStream to the file -- something like:
myContext.getAssets().open(fileName);
//read the data and store it in a variable
Then, if you truly need to do File related opterations with it, you can write it to a private (or public) directory and do your operations from you newly written file. Something like:
File storageDir = myContext.getDir(directoryName, Context.MODE_PRIVATE);
File myFile = new File(storageDir + File.separator + fileName);
//then, write the data to the file and manipulate it -- store the name for access via File later

Android: get route of file

I need the route of a pdf file in my Android Project.
The file could be in raw or in assets folder.
I need to get the route because I must call using the File Class
Ex: File file = new File(path);
Thanks
Image:
http://img19.imageshack.us/img19/2303/capturaww.png

I am not quite sure what you mean, assuming you want to read to PDF file in your assets (res file) look here
Access PDF files from 'res/raw' or assets folder programmatically to parse with given methods
But if you want to get the file path of a folder, then look here
how to get file path from sd card in android
How to get the file path from URI?
Here is an example of how to get a file path (taken from the third link)
File myFile = new File(uri.toString());
myFile.getAbsolutePath()

How to open and read a file in the src/my/package folder?

I would like to load the contents of a text file in a String.
The text file should stay in the same folder src/my/package as the .java.
However, I can't find the path to this file:
I have tried:
File f = new File("src/my/package/file.js");
File f = new File("file.js");
and many others but nothing worked.
What is the correct path to my file?

To open files located on the classpath, use the Class.getResource() family of methods. They work even if the file is inside a jar file with your classes. So something like
InputStream is = getClass().getResourceAsStream("/my/package/file.js");

File not found issue in Android

I need to access myfile.txt file using FileReader in Android , please suggest me where to add the text file in Eclipse. I tried it adding it in Resource and Asset but I am getting File not found issue.
FileReader fr = new FileReader("myfile.txt");
Even
File ff = new File("myfile.txt");
File Supports only the below listed parameters
FileReader Supports only the below listed parameters
Note: I want solution for this issue , only with FileReader or File

The directory would be /res/raw/ this is where you put all your extra resources.
you can refer to it using getResources().openRawResource(resourceName)
and check here Android how to get access to raw resources that i put in res folder?
EDIT:
how can i edit the text files in assets folder in android
in short
the easiest way would be to copy the file to external directory then do your stuff there
link is here
Android: How to create a directory on the SD Card and copy files from /res/raw to it?
One thing to mention - prior to 2.3 the file size in the assets cannot exceed 1MB.
hope it helps abit

That's how I obtain my file from the SD card, perhaps this can be some use to you.
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
File options = new File(getAppDirectory(), "portal.xml");
}
The getAppDirectory method used in the bit of code looks like this :
private String getAppDirectory() {
return new String(Environment.getExternalStorageDirectory().toString()
+ "/foldername/foldername/");
}
After this bit of code I also make sure the file exists and what not before I attempt to read from it.