zxing 怎样修改二维码扫描界面？
我在网上找资料说修改 zxing 里的 ViewfindView.java 文件里的 onDraw()方法里这一段代码
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); 可以修改二维码的扫描界面里扫描方框大小，可是不知如何入手。
希望有热心的网友可以指点一二，谢谢了！
目标是想修改成这样子的二维码扫描框。
&修改CameraManager.Java 中的&getFramingRect()&
int leftOffset = (screenResolution.x - width) / 4;
& & & int topOffset = (screenResolution.y - height) / 2;
& & &//长款一致
& & & framingRect = new Rect(leftOffset, topOffset, 3*leftOffset+ width, topOffset + height);06-2005-2705-0510-1709-0709-12
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& && && & 在实际的项目开发中，zxing作为一个二维码扫描功能的jar，功能已经非常强大了！但是在项目开发中，简单的界面，并不能达到美工的要求，我们需要自定义扫码界面。下面是一个这样的效果图：
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& && && & 源代码：
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Powered byAndroid开发——zxing二维码扫描使用小结
本文主要讲述了使用实现扫描二维码的步骤，现在整理出来分享给程序员兄弟们，希望给他们的开发工作带来帮助。
主要有三点：
1、界面绘制，包括4个边角、上下滚动的横线、在画布上添加文字
2、调整二维码扫描框的位置。
3、解决图片被压变形的问题。
1、界面绘制
ViewfinderView.java中onDraw()方法
public void onDraw(Canvas canvas) {
// 中间的扫描框，你要修改扫描框的大小，去CameraManager里面修改
Rect frame = CameraManager.get().getFramingRect();
int top = frame.
int left = frame.
int right = frame.
int bottom = frame.
frame = new Rect(left , top, right , bottom );
// 初始化中间线滑动的最上边和最下边
if (!isFirst) {
slideTop = frame.
slideBottom = frame.
// 获取屏幕的宽和高
int width = canvas.getWidth();
int height = canvas.getHeight();
// 画出扫描框外面的阴影部分，共四个部分，扫描框的上面到屏幕上面，扫描框的下面到屏幕下面
// 扫描框的左边面到屏幕左边，扫描框的右边到屏幕右边
// 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,
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);
// 画扫描框边上的角，总共8个部分
paint.setColor(Color.GREEN);
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);
//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.
Rect lineRect = new Rect();
lineRect.left = frame.
lineRect.right = frame.
lineRect.top = slideT
lineRect.bottom = slideTop + 18;
canvas.drawBitmap(((BitmapDrawable)(getResources().getDrawable(R.drawable.qrcode_scan_line))).getBitmap(), null, lineRect, paint);
//画扫描框下面的字
paint.setColor(Color.WHITE);
paint.setTextSize(TEXT_SIZE * density);
paint.setAlpha(0x40);
paint.setTypeface(Typeface.create(System, Typeface.BOLD));
String text = 将二维码放入框内, 即可自动扫描;
float textWidth = paint.measureText(text);
canvas.drawText(text, (width - textWidth)/2, (float) (frame.bottom + (float)TEXT_PADDING_TOP *density), paint);
Collection currentPossible = possibleResultP
Collection currentLast = lastPossibleResultP
if (currentPossible.isEmpty()) {
lastPossibleResultPoints =
possibleResultPoints = new HashSet(5);
lastPossibleResultPoints = currentP
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);
//只刷新扫描框的内容，其他地方不刷新
postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top,
frame.right, frame.bottom);
2、调整位置
如果不设置全屏，扫描框的位置和取图的位置高度目测会有50px误差， 不全屏公式：((Y - 标题栏 - 状态栏)/2 - 扫描框高度)/2 = y轴坐标 只要不全屏：就会有误差，导致框中的二维码靠上或者远离二维码才会扫描成功 如果设置为全屏，就不会有误差，请了解内情的大神告知笔者，想知道什么原因造成 CameraManager.java 中 getFramingRect()方法
public Rect getFramingRect() {
Point screenResolution = configManager.getScreenResolution();
if (framingRect == null) {
if (camera == null) {
/* 确定在固定比例分辨率下二维码扫描框的宽高*/
int width = screenResolution.x * 3 / 4;
if (width & MIN_FRAME_WIDTH) {
width = MIN_FRAME_WIDTH;
} else if (width & MAX_FRAME_WIDTH) {
width = MAX_FRAME_WIDTH;
int height = screenResolution.y * 3 / 4;
if (height & MIN_FRAME_HEIGHT) {
height = MIN_FRAME_HEIGHT;
} else if (height & MAX_FRAME_HEIGHT) {
height = MAX_FRAME_HEIGHT;
//计算x轴y轴坐标,可在此调整二维码框的位置
int leftOffset = (screenResolution.x - width) / 2 ;
int topOffset = ((screenResolution.y) /2 - height) / 2 ;
framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height);
Log.d(TAG, Calculated framing rect:
+ framingRect);
return framingR
3、框中图片变形
CameraConfigurationManager.java中void setDesiredCameraParameters(Camera camera)方法
* Sets the camera up to take preview images which are used for both preview
* and decoding. We detect the preview format here so that
* buildLuminanceSource() can build an appropriate LuminanceSource subclass.
* In the future we may want to force YUV420SP as it's the smallest, and the
* planar Y can be used for barcode scanning without a copy in some cases.
void setDesiredCameraParameters(Camera camera) {
// Camera.Parameters parameters = camera.getParameters();
// Log.d(TAG, Setting preview size:
+ cameraResolution);
// parameters.setPreviewSize(cameraResolution.x, cameraResolution.y);
// setFlash(parameters);
// setZoom(parameters);
// //setSharpness(parameters);
// //modify here
// camera.setDisplayOrientation(90);
// camera.setParameters(parameters);
Camera.Parameters parameters = camera.getParameters();
List supportedPreviewSizes = parameters
.getSupportedPreviewSizes();
int position = 0;
if (supportedPreviewSizes.size() & 2) {
position = supportedPreviewSizes.size() / 2 + 1;// supportedPreviewSizes.get();
position = supportedPreviewSizes.size() / 2;
int width = supportedPreviewSizes.get(position).
int height = supportedPreviewSizes.get(position).
Log.d(TAG, Setting preview size:
+ cameraResolution);
camera.setDisplayOrientation(90);
cameraResolution.x =
cameraResolution.y =
parameters.setPreviewSize(width, height);
setFlash(parameters);
setZoom(parameters);
// setSharpness(parameters);
camera.setParameters(parameters);
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