如何读取文件中的每个字母？

Question

I have this part of code. I can read all lines from the code. But I want take (read) every letter separately and put it into array. How can I do it? For Example: In file are numbers 00010 and I want put it into array like this: array[0,0,0,1,0]

public void readTest()
    {
            try
            {
                    InputStream is = getResources().getAssets().open("test.txt");
                    BufferedReader br = new BufferedReader(new InputStreamReader(is));
                    String st = "";
                    StringBuilder sb = new StringBuilder();

                    while ((st=br.readLine())!=null)
                    {
                            sb.append(st);
                    }

                    br.close();

            }catch (IOException e)
            {
                    Log.d(TAG, "Error: " + e);
            }
    }

Answer 1

Use br.read() . It returns the character as integer

ArrayList<char> charArray = new ArrayList<>();
int i;
while ((i = br.read()) != -1) {
    char c = (char) i;
    charArray.add(c);
}

Answer 2

Straight from the JavaDoc :

public int read() throws IOException - Reads a single character.

Answer 3

You should add read every string and add it's letters to array by iterating through it, like this:

 while ((st=br.readLine())!=null) {
            sb.append(st);


            for (int i = 0; i < st.length(); i++) {
                char c = st.charAt(i);        
                yourArray.add(c);
            }
 }