读取文件 - java.io.FileNotFoundException

Question

public void loadFile(int level){

    try {
                //Create new file
                levelFile = new File("assets/levels.txt");
                fis = new FileInputStream(levelFile);
                isr = new InputStreamReader(fis);    
                reader = new BufferedReader(isr);

                //Code to read the file goes here

Using this code, however, I keep getting the above error ( java.io.FileNotFoundException ).

The file definitely exists in my Assets folder and has the correct name. I've found a couple of similar questions on here and have tried various things including refreshing the project, cleaning the project, using "levels.txt" instead of "assets/levels.txt" but I keep getting this error.

Any ideas why?

Answer 1

Because you're dealing with outside the package, getResource() will be the best solution for your problem:

URL url = getClass().getResource("/assets/levels.txt");
File f = new File(url.toURI());
//....

Or you can directly get the input stream using getResourceAsStream() method :

InputStream  is= getClass().getResourceAsStream("/assets/levels.txt");
isr = new InputStreamReader(is); 

It's better since you don't have to use FileInputStream .

Note that URISyntaxException must be caught with FileNotFoundException or declared to be thrown.

Answer 2

In an Android project, the right way to read the content of asset files is by using the AssetManager . Asset files are the files you put in the assets/ folder of your Android project. This is mentioned briefly in the sidebar on the Accessing Resources page in the Android docs.

In particular, you can open the file assets/levels.txt and create a BufferedReader like this:

InputStream stream = context.getAssets().open("levels.txt");
BufferedReader reader = new BufferedReader(
            new InputStreamReader(stream));

Notice that the argument of the open call is simply levels.txt , not assets/levels.txt .

For more details see the full docs of AssetManager .