Android：获取原始文件夹中文本文件的行数

Question

Good day! I've been trying create a function that will return the number of lines in a text file located at raw folder but I always seem to get 0.

Heres the function I am using:

int getFileSize (InputStreamReader p_is) { 
        int lineCtr = 0;
        try {
            BufferedReader br = new BufferedReader(p_is);

            String theLine="";
            lineCtr = 0;
            while ((theLine = br.readLine()) != null)   {
                lineCtr++;
            }
        } catch (Exception e) {
                e.printStackTrace();
        }
        return lineCtr;

    }

Then I pass variable size to another activity:

    InputStreamReader is = new InputStreamReader(getResources().openRawResource(R.raw.sampleTxt));          
    int size = getFileSize(InputStreamReader is);

    intent.putExtra("v_size", size);
    startActivity(intent);

Then I retrieve it in the other activity:

    fileSize = getIntent().getIntExtra("v_size",0);

When I try to show the fileSize, it always shows 0:

    message= (TextView) findViewById(R.id.tv_message);

    String strSize = Integer.toString(fileSize);
    message.setText(strSize);

I have tried passing a string in putExtra() but it also shows 0. Please correct any mistakes you see and thank you for the help.

Answer 1

It's your line

int size = getFileSize(InputStreamReader is);

It doesn't need that InputStreamReader in there, that should show error when compiling code. Not sure how you managed to run it.

So you just have to remove that and then it should be able to read lines and the count you wanted.

Or is this getFileSize(InputStreamReader is) just a copy/paste error when you were writing your code to here?

Answer 2

Try using this code:

public static int countLine(String s){
    int ct=0;
    for(int i=0;i<s.length();i++){
        if(s.charAt(i)=='\n')
            ct++;
    }
    return ct;
}

String s is result of reading text file, I tried this code, and it worked correctly