image.png
插件原地址如下:
barcode-scanner-plugin
BarcodeScanner
src
com
LibraryProject
com.google.zxing.client.android.capture.jar
readme.md
...
android
主要目录如上。
集成说明。
当添加插件后,会将com.google.zxing.client.android.capture.jar文件拷贝到安卓项目的libs下,作为jar包使用。是zxing的打包,原文件就在LibraryProject中。
当你不进过修改直接使用该插件时,其扫码界面非常简陋。我们如何自定义扫码界面?
修改原文件,在LibraryProject目录中。
有两个难点,一是如何修改,二是如何打包成jar。
打包jar
我们先看怎么打包。
该目录下,我们看到ant.properties这个文件和config.xml文件。
如果你熟悉安卓开发就知道ant这个工具是做什么的,我猜测可能是打包工具,于是搜索了下ant,果然是我想的那样。
如何使用ant?
下载ant的安装包,这里是地址,下完后解压缩。
配置环境变量(目的是使用ant命令),如何添加环境变量不多说,每个人的shell配置文件不同
vi ~/.zshrc# ==> 添加下列代码(注意修改自己的路径)# antexport ANT_HOME=/Users/mrchen/Applications/apache-antexport PATH=$PATH:$ANT_HOME/bin
打开新terminal窗口,ant -version,查看是否配置正确。
进入LibraryProject目录下,使用ant命令打包jar文件。
cd LibraryProject ant ij-release
生成的jar文件在:LibraryProject/bin/classes.jar
将该文件重命名并覆盖com.google.zxing.client.android.capture.jar文件即可。
接下来将涉及源码的修改,当你知道怎么打包jar,源码修改就好办了。
图片变形的问题
源码修改主要是界面图像和扫描界面。文件集中在src/com/google/zxing/client/android中,其他文件都是核心文件,如果了解zxing项目就会知道,这个插件作者整理了下,将核心和安卓代码整合起来了。
主要做的改变是两个。
固定为竖屏
修改camera的分辨率
文件:CameraConfigurationManager.java
initFromCameraParameters() => 这个方法主要是初始化camera的参数
第一步: 修改始终为竖屏(默认是横屏),将下面的代码插入到
cameraResolution = findBestPreviewSizeValue(parameters, screenResolution);
之前,并将这一行改为
cameraResolution = findBestPreviewSizeValue(parameters, screenResolutionForCamera);
Point screenResolutionForCamera = new Point(); screenResolutionForCamera.x = screenResolution.x; screenResolutionForCamera.y = screenResolution.y;// preview size is always something like 480*320, other 320*480if (screenResolution.x < screenResolution.y) { screenResolutionForCamera.x = screenResolution.y; screenResolutionForCamera.y = screenResolution.x; }
第二步: 修改camera默认参数
在方法findBestPreviewSizeValue中,会根据屏幕分辨率和摄像头默认参数(比如支持的拍摄分辨率),进行计算得到合适的camera分辨率。
修改 MAX_PREVIEW_PIXELS 参数的默认值,该值是指定拍摄的分辨率,默认的720p。
private static final int MAX_PREVIEW_PIXELS = 1920 * 1080; // 最大支持1080p的图片
这里只需要在initFromCameraParameters 和 findBestPreviewSizeValue方法中修改即可。
扫码框尺寸和位置修改
代码位置
CameraManager.java
方法:Rect getFramingRect() => 获取扫码框尺寸位置参数, return rect(left, top, left, bottom);
这里非常简单,看下源码就懂了
修改扫码框边框和扫描线条
代码位置
ViewfinderView.java
void onDraw() => 使用的是canvas画的扫描框和激光线条。示例代码如下:
@Overridepublic void onDraw(Canvas canvas) { if (cameraManager == null) { return; // not ready yet, early draw before done configuring } Rect frame = cameraManager.getFramingRect(); if (frame == null) { return; } 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); // change.cf paint.setColor(frameAngleColor); canvas.drawRect(frame.left, frame.top, frame.left + 60, frame.top + 20, paint); canvas.drawRect(frame.left, frame.top, frame.left + 20, frame.top + 60, paint); canvas.drawRect(frame.right - 60, frame.top, frame.right, frame.top + 20, paint); canvas.drawRect(frame.right - 20, frame.top, frame.right, frame.top + 60, paint); canvas.drawRect(frame.left, frame.bottom - 60, frame.left + 20, frame.bottom, paint); canvas.drawRect(frame.left, frame.bottom - 20, frame.left + 60, frame.bottom, paint); canvas.drawRect(frame.right - 20, frame.bottom - 60, frame.right, frame.bottom, paint); canvas.drawRect(frame.right - 60, frame.bottom - 20, frame.right, frame.bottom, paint); Log.i("ViewfinderView", "**** draw rect angle ****"); // change.end if (resultBitmap != null) { // Draw the opaque result bitmap over the scanning rectangle paint.setAlpha(CURRENT_POINT_OPACITY); canvas.drawBitmap(resultBitmap, null, frame, paint); } else { // Draw a red "laser scanner" line through the middle to show decoding is active paint.setColor(laserColor); paint.setAlpha(SCANNER_ALPHA[scannerAlpha]); scannerAlpha = (scannerAlpha + 1) % SCANNER_ALPHA.length; // int middle = frame.height() / 2 + frame.top; // canvas.drawRect(frame.left + 2, middle - 1, frame.right - 1, middle + 2, paint); canvas.drawRect(frame.left + 2, frame.top + laserPosition - 4, frame.right + 2, frame.top + laserPosition + 4, paint); laserPosition += laserSpeed; if (laserPosition > frame.height()) { laserSpeed = -20; laserPosition = frame.height(); } if (laserPosition < 0) { laserSpeed = 20; laserPosition = 0; } /*Rect previewFrame = cameraManager.getFramingRectInPreview(); float scaleX = frame.width() / (float) previewFrame.width(); float scaleY = frame.height() / (float) previewFrame.height(); List<ResultPoint> currentPossible = possibleResultPoints; List<ResultPoint> currentLast = lastPossibleResultPoints; int frameLeft = frame.left; int frameTop = frame.top; if (currentPossible.isEmpty()) { lastPossibleResultPoints = null; } else { possibleResultPoints = new ArrayList<ResultPoint>(5); lastPossibleResultPoints = currentPossible; paint.setAlpha(CURRENT_POINT_OPACITY); paint.setColor(resultPointColor); synchronized (currentPossible) { for (ResultPoint point : currentPossible) { canvas.drawCircle(frameLeft + (int) (point.getX() * scaleX), frameTop + (int) (point.getY() * scaleY), POINT_SIZE, paint); } } } if (currentLast != null) { paint.setAlpha(CURRENT_POINT_OPACITY / 2); paint.setColor(resultPointColor); synchronized (currentLast) { float radius = POINT_SIZE / 2.0f; for (ResultPoint point : currentLast) { canvas.drawCircle(frameLeft + (int) (point.getX() * scaleX), frameTop + (int) (point.getY() * scaleY), radius, paint); } } }*/ // Request another update at the animation interval, but only repaint the laser line, // not the entire viewfinder mask. postInvalidateDelayed(ANIMATION_DELAY, frame.left - POINT_SIZE, frame.top - POINT_SIZE, frame.right + POINT_SIZE, frame.bottom + POINT_SIZE); } }
很简单,可以自己随便发挥画。注意上面代码我增加了几个变量。
private int laserPosition = 0;private int laserSpeed = 20;private int frameAngleColor = resources.getColor(fakeR.getId("color", "frame_angle"));
并且在res文件夹下的colors.xml中新增一条。
<color name="frame_angle">#feee00</color>
说明
修改后的源代码地址 =>
百度云
使用方法,解压缩后,添加到cordova插件中
cordova plugin add <your_barcode_scanner_path>
$(function() { $('.scan-btn').click(function() { cordova.plugins.barcodeScanner.scan( function (result) { alert("We got a barcode\n" + "Result: " + result.text + "\n" + "Format: " + result.format + "\n" + "Cancelled: " + result.cancelled); }, function (error) { alert("Scanning failed: " + error); }, { preferFrontCamera : false, // iOS and Android showFlipCameraButton : false, // iOS and Android showTorchButton : false, // iOS and Android torchOn: false, // Android, launch with the torch switched on (if available) prompt : "Place a barcode inside the scan area", // Android resultDisplayDuration: 0, // Android, display scanned text for X ms. 0 suppresses it entirely, default 1500 formats : "QR_CODE,PDF_417", // default: all but PDF_417 and RSS_EXPANDED orientation : "portrait", // Android only (portrait|landscape), default unset so it rotates with the device disableAnimations : true, // iOS disableSuccessBeep: false // iOS } ); }); });
示例项目地址 =>
coding.cordova_test
项目比较小,测试用,不是很完整,ignore文件什么都没有配,所以插件所有文件都上传上去了的。
示例apk下载 =>
cordova_test.apk
可以试试哦
作者:__damon__
链接:https://www.jianshu.com/p/a297648effea