Develop Reference

Why is android unable of finding my file?

I want to access a file in included in the folder of the app and I want to be able to access it localy. I also don't want to use methods like android.getresources() and just use
File file = new File( filePath );
My file is saved in app/src/main/assets/ball.obj
The problem is when I do File file = new File("app/src/main/assets/ball.obj");, it alwas gives me a FileNotFoundException. I also tried moving the file in other places and absolute pathes, but it still doesn't work. Please help.

My file is saved in app/src/main/assets/ball.obj
That is a relative path to a file on your development machine. Assets are not files on the filesystem of the device. You cannot use File to access an asset.
To get an InputStream on your asset, call getAssets() on your Activity or other Context, then call open() on the AssetManager returned by getAssets().
For your call to open(), you need to pass in the relative path within assets/ to the asset that you wish to read in. So, if you are in a method of your Activity, getAssets().open("ball.obj") will give you an InputStream that you can use to read in the contents of that particular asset.

How I get the asset file path as String?

hi i want the path to a file in my android assets folder.
How I get the path as String?
I try with :
String path = getClass().getClassLoader().getResource("file:///android_asset//psp.pdf").getPath();
I need the path as String.

The only ways to access an asset are:
Via open() on AssetManager, in which case your path is psp.pdf
Via file:///android_asset/ in WebView, in which case your path is file:///android_asset/psp.pdf
An asset is neither a file on a filesystem nor something that you get from a ClassLoader.

when I use getInstance of itext for image it is redirecting to different location [duplicate]

I'm doing the letter generation with iText (pdf/rtf) in java servlet and got a problem with accessing images. The images are in the WebContent/images folder. When I run it in a local server and pointing the full path of images directory (c://eclipse/myproject/WebContent/images/letterHead.jpg) its working, but it fails running on the server with the directory ("WebContent/images/letterHead.jpg").
The project is being deployed as a WAR on a tomcat server, thus ending up with an address similar to
http://someserver:8081/projectName/someJSP.jsp
I don't understand how to reference the images relatively in this environment, and any help would be much appreciated.
Here is my code
Image imghead = Image.getInstance("WebContent/images/letterHead.jpg");
imghead.setAbsolutePosition(35,770);
imghead.scaleAbsolute(125, 42);
document.add(imghead);

You should never use relative paths in java.io stuff. You will be dependent on the current working directory which is in no way controllable in case of a webapplication. Always use absolute disk file system paths. Thus, c:/full/path/to/file.ext.
You can use ServletContext#getRealPath() to convert a relative web path to an absolute disk file system path. The relative web path is rooted on the public webcontent folder which is in your case thus /WebContent. So, you need to replace the first line of above code by:
String relativeWebPath = "/images/letterHead.jpg";
String absoluteDiskPath = getServletContext().getRealPath(relativeWebPath);
Image imghead = Image.getInstance(absoluteDiskPath);
// ...

Following piece of code may help you...
String path = request.getContextPath();
String split_path[] = path.split("/");
path = request.getRealPath(split_path[0]);
String imagePath="\\resources\\images\\letterHead.jpg";
Image image = Image.getInstance(path+imagePath);

Following code can be used to access image path inside a java class.
URL imageUrl = getClass().getProtectionDomain().getCodeSource().getLocation();
Image img=Image.getInstance(imageurl+"../../../some/images/pic.gif");

So I had the same problem, I wanted to add an image to the pdf but through a relative path, so when I made a executable program it would work in any computer, even if it had or not the image saved.
I found a way where you add the image as a resource of your application. You need to put the image inside the src directory or the dir of the class where you call it and then you can use the following code:
Image image = Image.getInstance(yourClassName.class.getResource("/yourImageName")));
If you put the image inside a folder then, obviously, you'll need to add the path through the folders name ("folderName/yourImageName"). Hope it helps!

For Kotlin, if the image is in the resources folder, you can also try the following:
Image.getInstance(this::class.java.classLoader.getResourceAsStream("images/your_image.png").readBytes())

Resources
Image foto = Image.getInstance(this.getClass().getResource("/static/img/gobierno.jpg"));

How to get path to res.drawable folder to copy a file?

I am writing my app in AndroidStudio, I got gif file in my drawable/gifs folder and I wish to copy that file to MediaStore.Images.Media folder after clicking a button.
Currently I can't get my gif path even when using some answers posted.
The path I've tried using is
android.resource://com.example.bartoszwolski.cluainkeyboard/drawable/gifs/my.gif

Just use Uri:
Uri fileUri = Uri.parse("android.resource://your_packagename/" + R.drawable.your_image_id);
and:
new File(fileUri.getPath());

Android internal storage reading file

I have a problem with Android internal storage. I have created folder in package root folder calling getDir() and with MODE_WORLD_WRITEABLE because I want camera app to write captured image in this folder. Anyway, I can see that captured image is inside that folder with DDMS.
Problem is that I cannot read that file.
I tried to read file with this code:
File file = context.getDir("images", Context.MODE_WORLD_READABLE);
File image = new File(file, "image.jpeg");
if (image.canRead())
Log.w("read", "can read");
else
Log.w("read", "can't read");
And in LogCat there is only second message (can't read).
I have also tried to create FileInputStream with file name but I receive FileNotFoundException.
Can somebody tell me what I'm doing wrong here?
Thanks in advance
EDIT:
Reading file is correct but only problem is that when cam app is saving image to specified location, permission set by cam app to image file are -rwxrwx---. After changing permissions with
adb (chmod 777 image.jpeg)
I was able to read image. Interesting thing is that cam app is writing images files to sdcard with ----rwxr-x.
Is there any way to change file permission in runtime?

Why not put it in the default photo directory?
File path = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES);
File file = new File(path, "DemoPicture.jpg");
( From: http://developer.android.com/reference/android/os/Environment.html )
See also a more complete example invoking the camera app: http://developer.android.com/training/camera/photobasics.html

Referencing to Android developers you should use openFileOutput() and openFileInput() to work on the internal storage... you are not allowed / not able to make dirs there. Android does it itself.. Those data will be cleared when your application will be deleted.