Barcode scanner

Let's now jump into implementing a mobile-based barcode scanner using ML Kit. There are many formats for barcodes. ML Kit supports all the following listed formats:

Once the barcode is identified on the camera view, the draw method puts the bounding box on top of it, along with the detected barcode's raw value. The following code draws the barcode block annotations for position, size, and raw value on the supplied canvas:

/**
 * Draws the barcode block annotations
*/
@Override
public void draw(Canvas canvas) {
if (barcode == null) {
throw new IllegalStateException("Attempting to draw a null 
                                     barcode.");
}

// Draws the bounding box around the BarcodeBlock.
RectF rect = new RectF(barcode.getBoundingBox());
rect.left = translateX(rect.left);
rect.top = translateY(rect.top);
rect.right = translateX(rect.right);
rect.bottom = translateY(rect.bottom);
canvas.drawRect(rect, rectPaint);

// Renders the barcode at the bottom of the box.
canvas.drawText...