How to enter Sudoku game notes in a 9x9 cell - Android studio

Question

I'm newbie to java and Android studio. After many troubles and experience from a lots of mistakes, I have created sudoku game and it is almost finished but I have stuck at notes as shown in image (red box).

SudokuGame.java

public boolean[] notes = boolean[]{false, false, false, false, false, false, false, false, false};

public void setNotes(int notes) {
       this.notes[notes - 1] = !this.notes[notes - 1];
}

SudokuView.java

public void drawNotes(Canvas canvas) {
    int r = sudokuGame.selectedRow;
    int c = sudokuGame.selectedColumn;
    for (int row = 0; row < 9; row++) {
        for (int col = 0; col < 9; col++) {
            if (SudokuMain.notesStatustrue) {
                if (sudokuGame.getBoard()[row][col] == sudokuGame.getBoard()[r][c]) {
                    cellNotesPaint(canvas, r, c, notesColor);
                }
            }
        }
    }
}

private void cellNotesPaint(Canvas canvas, int row, int col, int maskColor) {
    notesPaint.setAntiAlias(true);
    notesPaint.setColor(maskColor);
    notesPaint.setTextSize(cellSize * 0.3f);
    if (sudokuGame.notes[0]) {
        canvas.drawText("1",
                col * cellSize + cellSize * 0.2f,
                row * cellSize + cellSize * 0.3f, notesPaint);
    }
    if (sudokuGame.notes[1]) {
        canvas.drawText("2",
                col * cellSize + cellSize * 0.5f,
                row * cellSize + cellSize * 0.3f, notesPaint);
    }
    if (sudokuGame.notes[2]) {
        canvas.drawText("3",
                col * cellSize + cellSize * 0.8f,
                row * cellSize + cellSize * 0.3f, notesPaint);
    }
    if (sudokuGame.notes[3]) {
        canvas.drawText("4",
                col * cellSize + cellSize * 0.2f,
                row * cellSize + cellSize * 0.6f, notesPaint);
    }
    if (sudokuGame.notes[4]) {
        canvas.drawText("5",
                col * cellSize + cellSize * 0.5f,
                row * cellSize + cellSize * 0.6f, notesPaint);
    }
    if (sudokuGame.notes[5]) {
        canvas.drawText("6",
                col * cellSize + cellSize * 0.8f,
                row * cellSize + cellSize * 0.6f, notesPaint);
    }
    if (sudokuGame.notes[6]) {
        canvas.drawText("7",
                col * cellSize + cellSize * 0.2f,
                row * cellSize + cellSize * 0.9f, notesPaint);
    }
    if (sudokuGame.notes[7]) {
        canvas.drawText("8",
                col * cellSize + cellSize * 0.5f,
                row * cellSize + cellSize * 0.9f, notesPaint);
    }
    if (sudokuGame.notes[8]) {
        canvas.drawText("9",
                col * cellSize + cellSize * 0.8f,
                row * cellSize + cellSize * 0.9f, notesPaint);
    }
}

SudokuMain.java

if (notesStatus) { sudokuGame.setNotes(inputNumber); }

My problem is, when I clicked 1 to 9 buttons the same notes are showing in all selected cells (even in locked cells also). I want to show the notes in individual entered cells of different numbers.