I've been developing for android using processing but have come to a halt when I wanted to retrieve a list of files within a given directory. Below is a screenshot of the code I have been trying.
I have tried different variations of this (such as getbaseContext().getAssets();) and nothing seems to work. Whenever the code tries to execute the list() part it has an error and there is nothing in 'fileNames'.
Am I missing anything? Is this a problem with processing?
Thanks
EDIT: The direction I am trying to access is "assets/Levels/" which I can see from my project view in eclipse.
I experienced a similar issue because I used folder names with a trailing / character.
So for others experiencing this issue, you need to make sure the folder name you use are just the folder name with no trailing / (so "movies" instead of "movies/")
You do not need any additional permissions in order to run the code that you have. I just compiled it on my device and it works fine. You mention you are attempting to list the files in a given directory. What you are doing is listing the files in the Levels folder, which should be a sub folder of assets. What you will get back is an array of all file names in that folder.
If you are actually looking to get a list of files from a given directory, it has nothing to do with the assets folder and I suggest you check out a tutorial on Android external and internal storage. The information directly on the android page was very helpful to me.
http://developer.android.com/guide/topics/data/data-storage.html
If that's not what you are looking for though, I suggest rewording your question.
So I got it to work!
Turns out it was a problem with where I was placing the 'String[] fileNames;' code before trying to put data into it. The below code works fine:
Thanks for the help!
*Note : Individual folder should not empty.. It will return zero for folder with no files. *
void getFolderDetais(String folder_name)
{
// pass folder_name empty to get detail of root that means assets folder details
String[] filelistInSubfolder = assetManager.list(folder_name);
Log.v("Floder Details ----- >", " Length --- "
+ filelistInSubfolder.length);
}
Related
i need a help understanding what is happening in my project, anyways i have javafx with springboot:
i have folder structure like this :
So i want to access from my java/controller folder, and i need my css file that is under resources folder, in css folder.
I tried every possible way, to load my css and nothing seems to work except :
Directly loading css through fxml (which i wish to evade)
using this code also works, but only in IDE, if i create JAR it does not work anymore :
File f = new File("src/main/resources/css/main.css");
paneRoot.getStylesheets().add("file:///" + f.getAbsolutePath().replace("\\", "/"));
When i do check of f.exists() i get true, so path is ok, but when i use this :
paneRoot.getStylesheets().add(getClass().getResource("src/main/resources/css/main.css").toExternalForm());
or
paneRoot.getStylesheets().add("src/main/resources/css/main.css");
it does not work,in first code line, where i use .toExternalForm(), program crashes reporting nullPointer.
Now i honestly do not know what is issues here, i tried with 2 different IDE-s, i tried clearing cashe, rebulding and cleaning application, but every time same issue.
If i need to provide further code, i will i just need to understand this.
I need to write a program that asks for the file name of a text document of number and then calculates average, median, etc., from this data set. I have written the program so that runs correctly when I input the full path such as "C:\Users\COSC\Documents\inputValues2.txt", however it will not run when I simply input inputValues2.txt. I have been researching the different between the two but am not fully understanding how to fix this. Since it is running correctly, otherwise, I don't believe it is a problem with the code, but I am new to this so I may be wrong.
Your program needs to know the full path in order to find the file. It isn't just searching your computer for the file "inputValues2.txt". It needs to know exactly how to get there. If you wanted to, you could move the file into your project folder, and then you would just be able to write "inputValues2.txt" to access it. I normally create a folder called "res" in my project folder, and then let's say I am trying to create an image:
Image i = new Image("res/img.png");
Your file should be in the class-path. That's in the same directory that your main class is in.
The suggested practice is to place it in a Resources directory inside your class-path, then you can access it via, "Resources/inputValues2.txt".
I need to write a program that asks for the file name of a text document of number and then calculates average, median, etc., from this data set. I have written the program so that runs correctly when I input the full path such as "C:\Users\COSC\Documents\inputValues2.txt", however it will not run when I simply input inputValues2.txt. I have been researching the different between the two but am not fully understanding how to fix this. Since it is running correctly, otherwise, I don't believe it is a problem with the code, but I am new to this so I may be wrong.
Your program needs to know the full path in order to find the file. It isn't just searching your computer for the file "inputValues2.txt". It needs to know exactly how to get there. If you wanted to, you could move the file into your project folder, and then you would just be able to write "inputValues2.txt" to access it. I normally create a folder called "res" in my project folder, and then let's say I am trying to create an image:
Image i = new Image("res/img.png");
Your file should be in the class-path. That's in the same directory that your main class is in.
The suggested practice is to place it in a Resources directory inside your class-path, then you can access it via, "Resources/inputValues2.txt".
so I am in the process of making a small application.
Right now, the project works fine. I am running it through an IDE. The problem comes about when trying to run the project as a jar - which is the end result. Right now, it fails to properly load the required files (classes and simple ASCII files).
The method I am using is one based off of:
final Enumeration<URL> paths = CLASS_LOADER.getResources("");
Where CLASS_LOADER is an instance of class.getClassLoader().
This works great when not inside a jar. Inside a jar though, it seems to fail horribly. For example, in the code above, paths would be empty.
I am assuming that the fault is that the files are all within a jar - the same jar to be precise.
The class path for the manifest file is blank at the moment.
If it helps, I have two tasks that require loading files.
I need to create a list of all files that are a subclass of
another class.
I need to load a list of language files (all of
which are in the same directory).
If you need anything else to help debug this problem or provide a solution - let me know. Thanks for reading this!
For ClassLoader.getResources() to work you need to feed a path relative to the jar root. If you want to search the jar then ClassLoader public API won't help you. You have to use custom code based on java.util.jar.JarFile, like the one here.
I need to specify the location of some native libraries in my Android application. I was accomplishing this with a hard-coded string:
public static final String DLL_DIR_STR = "/data/data/my.application.package/lib";
but wanted to get the path from Android instead. Following posts like this, I used getDir() to find the lib directory, changing
superCollider = new SCAudio(DLL_DIR_STR);
to
superCollider = new SCAudio(container.$context().getDir("lib", 0).getAbsolutePath());
Oddly, the initial libraries seem to load correctly
Trying to load lib /data/data/my.application.package/lib/libsndfile.so 0x42718d80
Added shared lib /data/data/my.application.package/lib/libsndfile.so 0x42718d80
No JNI_OnLoad found in /data/data/my.application.package/lib/libsndfile.so 0x42718d80, skipping init
Trying to load lib /data/data/my.application.package/lib/libscsynth.so 0x42718d80
Added shared lib /data/data/my.application.package/lib/libscsynth.so 0x42718d80
But when libscsynth tries to load some additional code, it's using the wrong path:
OK, listing opendir(/data/data/my.application.package/app_lib)
Any ideas where the "app_" comes from? I thought I must be using getDir() wrong, but the initial files load fine. Could it be something in the native code? Thanks for your help.
I found the answer, quite by accident, in this post. ApplicationInfo.dataDir holds the location of the data directory, and "lib" is easily navigated to from there:
superCollider = new SCAudio(container.$context().getApplicationInfo().dataDir + "/lib");
Alternatively, nativeLibraryDir takes you directly to the lib directory, but requires API level 9.
Thanks for your help!
getDir will always prepend app_ to the directory name so it is very odd that it is working the first time. I would either just expect the app_ to be there or try using getFilesDir, at least you always know what it will return. Does SuperCollider have a restriction on what the directory name is?
I found another SuperCollider Project that seems to be doing the same thing you did initially with the comment "// TODO: not very extensible,".. I found that funny :)