前言
首先使用ZXing项目前我们需要对其进行简化，因为开源的ZXing项目中Android实现里面有太多多余的东西了，得对其进行简化，并且原始的ZXing项目扫描框并不美观所以也要对其进行自定义美化。
简化
在开始前大致介绍一下简化ZXing需要用到各个包 、类的职责。
- CaptureActivity。这个是启动Activity 也就是扫描器（如果是第一安装，它还会跳转到帮助界面）。
- CaptureActivityHandler 解码处理类，负责调用另外的线程进行解码。
- DecodeThread 解码的线程。
- com.google.zxing.client.android.camera 包，摄像头控制包。
- ViewfinderView 自定义的View，就是我们看见的拍摄时中间的框框了。
详细简化过程参考博文“http://www.cnblogs.com/keyindex/archive/2011/06/08/2074900.html”
自定义扫描框
自定义扫描框需要修改ViewfinderView自定义的View类。绘制窗体方法在onDraw(Canvas canvas)方法中。
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@Override public
void onDraw(Canvas canvas) {
Rect frame = CameraManager.get().getFramingRect();
if
(frame == null) {
return;
}
// 初始化中间线滑动的最上边和最下边
if
(!isFirst) {
isFirst = true;
slideTop = frame.top;
slideBottom = frame.bottom;
}
int
width = canvas.getWidth();
int
height = canvas.getHeight();
// 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);
if
(resultBitmap != null) {
// Draw the opaque result bitmap over the scanning rectangle
paint.setAlpha(OPAQUE);
canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint);
} else
{
// 画扫描框
paint.setColor(frameColor);
canvas.drawRect(frame.left, frame.top, frame.right + 1,
frame.top + 2, paint);
canvas.drawRect(frame.left, frame.top + 2, frame.left + 2,
frame.bottom - 1, paint);
canvas.drawRect(frame.right - 1, frame.top, frame.right + 1,
frame.bottom - 1, paint);
canvas.drawRect(frame.left, frame.bottom - 1, frame.right + 1,
frame.bottom + 1, paint);
paint.setColor(laserColor);
//画扫描框边上的角，总共8个部分
canvas.drawRect(frame.left, frame.top, frame.left + ScreenRate,
frame.top + CORNER_WIDTH, paint);
canvas.drawRect(frame.left, frame.top, frame.left + CORNER_WIDTH, frame.top
+ ScreenRate, paint);
canvas.drawRect(frame.right - ScreenRate, frame.top, frame.right,
frame.top + CORNER_WIDTH, paint);
canvas.drawRect(frame.right - CORNER_WIDTH, frame.top, frame.right, frame.top
+ ScreenRate, paint);
canvas.drawRect(frame.left, frame.bottom - CORNER_WIDTH, frame.left
+ ScreenRate, frame.bottom, paint);
canvas.drawRect(frame.left, frame.bottom - ScreenRate,
frame.left + CORNER_WIDTH, frame.bottom, paint);
canvas.drawRect(frame.right - ScreenRate, frame.bottom - CORNER_WIDTH,
frame.right, frame.bottom, paint);
canvas.drawRect(frame.right - CORNER_WIDTH, frame.bottom - ScreenRate,
frame.right, frame.bottom, paint);
paint.setAlpha(SCANNER_ALPHA[scannerAlpha]);
scannerAlpha = (scannerAlpha + 1) % SCANNER_ALPHA.length;
//绘制中间的线,每次刷新界面，中间的线往下移动SPEEN_DISTANCE
slideTop += SPEEN_DISTANCE;
if(slideTop >= frame.bottom){
slideTop = frame.top;
}
canvas.drawRect(frame.left + MIDDLE_LINE_PADDING, slideTop - MIDDLE_LINE_WIDTH/2, frame.right - MIDDLE_LINE_PADDING,slideTop + MIDDLE_LINE_WIDTH/2, paint);
Collection<ResultPoint> currentPossible = possibleResultPoints;
Collection<ResultPoint> currentLast = lastPossibleResultPoints;
if
(currentPossible.isEmpty()) {
lastPossibleResultPoints = null;
} else
{
possibleResultPoints = new
HashSet<ResultPoint>(5);
lastPossibleResultPoints = currentPossible;
paint.setAlpha(OPAQUE);
paint.setColor(resultPointColor);
for
(ResultPoint point : currentPossible) {
canvas.drawCircle(frame.left + point.getX(), frame.top
+ point.getY(), 6.0f, paint);
}
}
if
(currentLast != null) {
paint.setAlpha(OPAQUE / 2);
paint.setColor(resultPointColor);
for
(ResultPoint point : currentLast) {
canvas.drawCircle(frame.left + point.getX(), frame.top
+ point.getY(), 3.0f, paint);
}
}
postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top,
frame.right, frame.bottom);
}
}
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