How to make your view transparent / display only the drawing in Android Studio?

I have a class named DrawView which extends View and is on top of a TableLayout. I'm using this class to draw 1 simple line using the drawLine() method. My TableLayout is being overdrawn because my DrawView class is on top of it. How can I prevent this? My line needs to be on top of the TableLayout, said line isn't using the whole canvas, so I thought setting the background to transparent would fix it, which isn't the case.

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;

public class DrawView extends View {
    private final Paint paint = new Paint();
    private static int orientation;
    private static int pos;
    public static final int HORIZONTAL = 1;
    public static final int VERTICAL = 2;
    public static final int DIAGONAL = 3;
    public static final int TOP_LEFT = 4;
    public static final int TOP_RIGHT = 5;

    private void init() {
        paint.setColor(Color.BLACK);
        paint.setStrokeWidth(25f);
        paint.setAntiAlias(true);
    }

    public DrawView(Context context) {
        super(context);
        init();
    }

    public DrawView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public DrawView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    public static void setOrientation(int newOrientation) {
        orientation = newOrientation;
    }

    public static void setPosition(int newPosition) {
        pos = newPosition;
    }

    @Override
    public void onDraw(Canvas canvas) {
        final int INDENT = 147;
        canvas.drawColor(Color.TRANSPARENT);
        switch (orientation) {
            case HORIZONTAL:
                switch (pos) {
                    case 0:
                        canvas.drawLine(10, INDENT, getWidth() - 10, INDENT, paint);
                        break;
                    case 1:
                        canvas.drawLine(10, INDENT * 3, getWidth() - 10, INDENT * 3, paint);
                        break;
                    case 2:
                        canvas.drawLine(10, INDENT * 5, getWidth() - 10, INDENT * 5, paint);
                        break;
                }
                break;
            case VERTICAL:
                switch (pos) {
                    case 0:
                        canvas.drawLine(INDENT, 10, INDENT, getHeight() - 10, paint);
                        break;
                    case 1:
                        canvas.drawLine(INDENT * 3, 10, INDENT * 3, getHeight() - 10, paint);
                        break;
                    case 2:
                        canvas.drawLine(INDENT * 5, 10, INDENT * 5, getHeight() - 10, paint);
                        break;
                }
                break;
            case DIAGONAL:
                if (pos == TOP_LEFT) {
                    canvas.drawLine(10, 10, getWidth() - 10, getHeight() - 10, paint);
                } else if (pos == TOP_RIGHT) {
                    canvas.drawLine(10, getHeight() - 10, getWidth() - 10, 10, paint);
                }
                break;
        }
    }

}

This view is also invisible, until I call this method:

public void displayResult(int result) {
        // TODO: Fix board being overdrawn by DrawView
        DrawView drawView = new DrawView(this);
        //drawView.setBackgroundColor(Color.TRANSPARENT);
        drawView.setVisibility(View.VISIBLE);
        /*...*/
    }

But it still overdraws my TableLayout.
This is how my layout looks if the DrawView is under the TableLayout, as one can guess no line will displayed:

And this is how my layout looks if the DrawView is above the TableLayout, this way I get a line with a white background which completely overdraws my TableLayout:

How can I make sure only the line is drawn without the white background of it?

To my shame, the background of the layout, in which my view (DrawView) is, was set to white. Therefore my view also had a white canvas, thus overdrawing my TableLayout.

While this might be an underwhelming answer, it might help someone who comes along this in the future.

Check your layout's background.