How to draw a line with custom stroke style in android?

Question

Edit : my first part of question is unique, but the second part is similar to some other questions. Main Problem: this is my class code,I use this class to draw lines with custom stroke shape from drawable . I want to draw a line, but it just draw some dots as shown in the picture below. Is there any idea to fix this problem?

public class MainDrawingView extends View {
    private Bitmap mBitmapBrush;
    private Bitmap rBitmapBrush;
    private Vector2 mBitmapBrushDimensions;
    private List<Vector2> mPositions = new ArrayList<Vector2>(100);

    private static final class Vector2 {
        public Vector2(float x, float y) {
            this.x = x;
            this.y = y;
        }
        public final float x;
        public final float y;
    }

    public MainDrawingView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        mBitmapBrush = BitmapFactory.decodeResource(context.getResources(), R.drawable.brush01);
        rBitmapBrush = Bitmap.createScaledBitmap(mBitmapBrush, 10, 10, false);
        mBitmapBrushDimensions = new Vector2(rBitmapBrush.getWidth(), rBitmapBrush.getHeight());
    }

    @Override
    protected void onDraw(Canvas canvas) {
        for (Vector2 pos : mPositions) {
            canvas.drawBitmap(rBitmapBrush, pos.x, pos.y, null);
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        int action = event.getAction();
        switch (action) {
            case MotionEvent.ACTION_MOVE:
                final float posX = event.getX();
                final float posY = event.getY();
                mPositions.add(new Vector2(posX - mBitmapBrushDimensions.x / 2, posY - mBitmapBrushDimensions.y / 2));
                invalidate();
        }
        return true;
    }
}

Update: I try another class to draw a line with my drawable, but I faced 2 new problem! the first; when I use setShader , there is no any line when touch and move my finger on the screen. and the second;when comment the setShader line in the code, I could draw a simple black line, but if I draw a curved line rapidly, the result is a broken line ! and not a true curve line.so what is your idea to solve these problems?

public class MainDrawingView extends View {
    private Bitmap mBitmapBrush;
    private Bitmap rBitmapBrush;
    private BitmapShader mBitmapShader;
    private Paint paint = new Paint();
    private Path path = new Path();

    public MainDrawingView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        mBitmapBrush = BitmapFactory.decodeResource(context.getResources(), R.drawable.brush01);
        rBitmapBrush = Bitmap.createScaledBitmap(mBitmapBrush, 10, 10, false);
        mBitmapShader = new BitmapShader(rBitmapBrush, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
        paint.setAntiAlias(true);
        paint.setStrokeWidth(5f);
        paint.setColor(Color.BLACK);
        paint.setStyle(Paint.Style.STROKE);
        paint.setStrokeJoin(Paint.Join.ROUND);
        //paint.setShader(mBitmapShader);

    }

    @Override
    protected void onDraw(Canvas canvas) {
        canvas.drawPath(path, paint);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        float eventX = event.getX();
        float eventY = event.getY();

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                path.moveTo(eventX, eventY);
                return true;
            case MotionEvent.ACTION_MOVE:
                path.lineTo(eventX, eventY);
                break;
            default:
                return false;
        }
        invalidate();
        return true;
    }
}