如何在Android Studio中使用fileReader读取文本文件数据？

Question

I have a fileReader that works in Java but the same method doesn't work for Android Studios. The code I use in Eclipse to read my text file data is:

public void addTextFilesToCardsArrayList(String fileName) throws IOException{
        FileReader freader =  new FileReader(fileName);
        BufferedReader reader = new BufferedReader(freader);
        String line = null;
        try {
            while ((line = reader.readLine()) != null) {        //Read a file line by line
                 String[] split = line.split(",");              //Parse the line in to usable fragments
                 int cardNumber = Integer.parseInt(split[0]);
                 String cardId = split[1];
                 int apc = Integer.parseInt(split[2]);
                 int hp = Integer.parseInt(split[3]);
                 String type = split[4];

                 Card card = new Card(cardNumber, cardId, apc, hp, type);
                 cards.add(card);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

I placed a text file called "cards.txt" in the asset folder that I created in "main" directory. Normally I pass it in as a paramter like "cards.txt" in Eclipse. How do I get it working in Android Studios fileReader?

I've seen InputStream is = getAssets().open("file.txt"); being used but I've liked to keep my method mostly the same without rewriting my fileReader code.

Answer 1

I placed a text file called "cards.txt" in the asset folder that I created in "main" directory

That is a file on your development machine. It is not a file on your Android device.

I've seen InputStream is = getAssets().open("file.txt"); being used

That is the correct approach to use.

but I've liked to keep my method mostly the same without rewriting my fileReader code.

Then pass in an InputStream rather than a String to addTextFilesToCardsArrayList() . Replace FileReader with InputStreamReader . In Android, use the InputStream from getAssets().open() . Elsewhere, use a FileInputStream .