java ZXing Barcode Reader：如何在捕获屏幕周围制作自定义边框？
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ZXing Barcode Reader: How to make custom border around capture screen?
提问by Androider
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?
我想在 zxing 捕获屏幕（相机屏幕）周围放置自定义边框。我需要为此做哪些修改？我需要更改哪些活动和布局才能产生这种效果？
回答by inazaruk
You don't need to edit layouts at all.
您根本不需要编辑布局。
In ViewfinderViewfind onDrawmethod. It's the core that draws the "scanning rectangle". You can modify it the way you want.
在ViewfinderView查找onDraw方法中。它是绘制“扫描矩形”的核心。您可以按照自己的方式修改它。
The code that actually draws the rectangle can be found here:
实际绘制矩形的代码可以在这里找到：
// 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by ahodder
回答by tej shah
Actually you can override the color in your own colors.xml file i.e.
其实你可以覆盖你自己的colors.xml文件中的颜色，即
<color name="viewfinder_border">#00d1cf</color>
回答by chathura
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.
这个问题已经有了答案。但是如果有人需要如何在捕获屏幕周围绘制边框，这里是代码。inazaruk 的回答是正确的。我的回答只是对此的扩展。
//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);
