ZXing Barcode Reader: How to make custom border around capture screen?

Question

I want to put custom border around zxing capture screen (camera screen). What modification would I need to make for this? Which activity and layouts would I need to change to have this effect?

Solution 1

You don't need to edit layouts at all.

In ViewfinderView find onDraw method. It's the core that draws the "scanning rectangle". You can modify it the way you want.

The code that actually draws the rectangle can be found here:

// Draw the exterior (i.e. outside the framing rect) darkened
paint.setColor(resultBitmap != null ? resultColor : maskColor);
canvas.drawRect(0, 0, width, frame.top, paint);
canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);
canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1, paint);
canvas.drawRect(0, frame.bottom + 1, width, height, paint);

Solution 2

This question already has an answer. But if someone needs how to draw a border around capture screen, here is the code. inazaruk's answer is correct. My answer is just an extension for that.

 //initialize new paint in the constructor
 Paint borderPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
 borderPaint.setColor(ContextCompat.getColor(context, R.color.colorPrimary));

 //inside onDraw
 int distance = (frame.bottom - frame.top) / 4;
 int thickness = 15;

 //top left corner
 canvas.drawRect(frame.left - thickness, frame.top - thickness, distance + frame.left, frame.top, borderPaint);
 canvas.drawRect(frame.left - thickness, frame.top, frame.left, distance + frame.top, borderPaint);

 //top right corner
 canvas.drawRect(frame.right - distance, frame.top - thickness, frame.right + thickness, frame.top, borderPaint);
 canvas.drawRect(frame.right, frame.top, frame.right + thickness, distance + frame.top, borderPaint);

 //bottom left corner
 canvas.drawRect(frame.left - thickness, frame.bottom, distance + frame.left, frame.bottom + thickness, borderPaint);
 canvas.drawRect(frame.left - thickness, frame.bottom - distance, frame.left, frame.bottom, borderPaint);

 //bottom right corner
 canvas.drawRect(frame.right - distance, frame.bottom, frame.right + thickness, frame.bottom + thickness, borderPaint);
 canvas.drawRect(frame.right, frame.bottom - distance, frame.right + thickness, frame.bottom, borderPaint);

Solution 3

Here is how a few others on SO did it.

Also look here, it looked useful.

Finally, I would use this one.

Solution 4

Actually you can override the color in your own colors.xml file i.e.

<color name="viewfinder_border">#00d1cf</color>

View more solutions

Comments

[Androider]

I want to put a border around it. Any clues on how I could use this modify the outer area that is not in scanning rectangle? How would I ID the area that is the scanning rectangle vs. the outer shell? Also can I set vertical layout or is it always horizontally run? Thanks

[inazaruk]

I've added direct link to the code that is responsible for the rectangle. You can replace code and draw whatever you want instead.

[inazaruk]

To allow portrait mode for scanner activity remove android:screenOrientation="landscape" from CaptureActivity definition in AndroidManifest ( code.google.com/p/zxing/source/browse/trunk/android/… ). But I would strongly recommend against it. Try it yourself and you will understand why.

[arwTheDev]

how can you change the radius of the rectangles to make them rounded?