无法使用Buffered Reader打开csv文件

Question

I'm trying to read the csv file which is in my res/raw/friends.csv and import it record by record in my database. However, 3rd line of my function seems to unable to either locate or open the file and exiting with javaNULLPointerException. What should I do?

 public void fillBase(SQLiteDatabase db){
        BufferedReader in=null;
        try {
            in = new BufferedReader(new FileReader("raw/friends.csv")); 
        } catch (FileNotFoundException e) {
            e.printStackTrace(); //end up going here!
        }
        String line = null;
        try {
            while ((line = in.readLine()) != null) {
                String[] parts = line.split(",");
                ContentValues values = new ContentValues();
                values.put("Name", parts[0]); 

                // Insert the data into the database
                db.insert(FRIENDS, null, values); // insert your table name
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

Answer 1

First, you should have just one big try-catch block and not two; if the first fail the 2nd will always fail with a NullPointerException.

Second, you can't use file names and paths to access resources in an Android app. That only works for desktop Java programs.

Instead you must use getResources().openRawResource()

Here's a working version of your code:

 public void fillBase(SQLiteDatabase db){
        try {
        BufferedReader in= new BufferedReader(getResources().openRawResource(R.raw.friends)); 
        String line = null;
            while ((line = in.readLine()) != null) {
                String[] parts = line.split(",");
                ContentValues values = new ContentValues();
                values.put("Name", parts[0]); 

                // Insert the data into the database
                db.insert(FRIENDS, null, values); // insert your table name
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }