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

问题

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?

回答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);

回答2:

Here is how a few others on SO did it.

Also look here, it looked useful.

Finally, I would use this one.

回答3:

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

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

回答4:

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);

来源：https://stackoverflow.com/questions/5852059/zxing-barcode-reader-how-to-make-custom-border-around-capture-screen