【Android 学习】之二维码扫描开发（闪光灯功能）

、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、

Android二维码扫描我们可以调用Ｚｉｎｇ．ｊａｒ包，用人家写好的代码，我们只需要根据自己的需要修改布局即可．下面我简单介绍一下Ａｎｄｒｏｉｄ我们怎么来用和修改人家的代码．

1、下载Zing.jar包http://download.csdn.net/detail/u013132758/9361939

２、解压导入项目可以用了。

效图如下：

详细介绍一下如何根据自己的需求来修改代码：

首先在ＡｎｄｒｏｉｄＭａｉｎｆｅｓｔ。ｘｍｌ中添加权限

<uses-permission android:name="android.permission.FLASHLIGHT"/>
<uses-permission android:name="android.permission.DISABLE_KEYGUARD"/>

<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.CAMERA" />

<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />

１、项目结构如下所示

２、若修改扫描框的大小可在CameraManager里面修改参数width,height该项目中我设置为０．７倍的屏幕宽度。

CameraManager.java

package com.zm.app.zxing.camera;/** Copyright (C) 2008 ZXing authors** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**      http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/import java.io.IOException;
import java.util.List;import android.content.Context;
import android.graphics.PixelFormat;
import android.graphics.Point;
import android.graphics.Rect;
import android.hardware.Camera;
import android.os.Build;
import android.os.Handler;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.SurfaceHolder;import com.zm.app.zxing.camera.PlanarYUVLuminanceSource;/*** This object wraps the Camera service object and expects to be the only one talking to it. The* implementation encapsulates the steps needed to take preview-sized images, which are used for* both preview and decoding.**/
public final class CameraManager {private static final String TAG = CameraManager.class.getSimpleName();private static CameraManager cameraManager;static final int SDK_INT; // Later we can use Build.VERSION.SDK_INTstatic {int sdkInt;try {sdkInt = Integer.parseInt(Build.VERSION.SDK);} catch (NumberFormatException nfe) {// Just to be safesdkInt = 10000;}SDK_INT = sdkInt;}private final Context context;private final CameraConfigurationManager configManager;private Camera camera;private Rect framingRect;private Rect framingRectInPreview;private boolean initialized;private boolean previewing;private final boolean useOneShotPreviewCallback;/*** Preview frames are delivered here, which we pass on to the registered handler. Make sure to* clear the handler so it will only receive one message.*/private final PreviewCallback previewCallback;/** Autofocus callbacks arrive here, and are dispatched to the Handler which requested them. */private final AutoFocusCallback autoFocusCallback;/*** Initializes this static object with the Context of the calling Activity.** @param context The Activity which wants to use the camera.*/public static void init(Context context) {if (cameraManager == null) {cameraManager = new CameraManager(context);}}/*** Gets the CameraManager singleton instance.** @return A reference to the CameraManager singleton.*/public static CameraManager get() {return cameraManager;}private CameraManager(Context context) {this.context = context;this.configManager = new CameraConfigurationManager(context);// Camera.setOneShotPreviewCallback() has a race condition in Cupcake, so we use the older// Camera.setPreviewCallback() on 1.5 and earlier. For Donut and later, we need to use// the more efficient one shot callback, as the older one can swamp the system and cause it// to run out of memory. We can't use SDK_INT because it was introduced in the Donut SDK.//useOneShotPreviewCallback = Integer.parseInt(Build.VERSION.SDK) > Build.VERSION_CODES.CUPCAKE;useOneShotPreviewCallback = Integer.parseInt(Build.VERSION.SDK) > 3; // 3 = CupcakepreviewCallback = new PreviewCallback(configManager, useOneShotPreviewCallback);autoFocusCallback = new AutoFocusCallback();}/*** Opens the camera driver and initializes the hardware parameters.** @param holder The surface object which the camera will draw preview frames into.* @throws IOException Indicates the camera driver failed to open.*/public void openDriver(SurfaceHolder holder) throws IOException {if (camera == null) {camera = Camera.open();if (camera == null) {throw new IOException();}camera.setPreviewDisplay(holder);if (!initialized) {initialized = true;configManager.initFromCameraParameters(camera);}configManager.setDesiredCameraParameters(camera);//FIXME//     SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);//�Ƿ�ʹ��ǰ��
//      if (prefs.getBoolean(PreferencesActivity.KEY_FRONT_LIGHT, false)) {
//        FlashlightManager.enableFlashlight();
//      }FlashlightManager.enableFlashlight();}}public void openLight(){if (camera != null) {Camera.Parameters parameter;parameter = camera.getParameters();parameter.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);camera.setParameters(parameter);}}public void offLight(){if (camera != null) {Camera.Parameters parameter;parameter = camera.getParameters();parameter.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);camera.setParameters(parameter);}}/*** Closes the camera driver if still in use.*/public void closeDriver() {if (camera != null) {FlashlightManager.disableFlashlight();camera.release();camera = null;}}/*** Asks the camera hardware to begin drawing preview frames to the screen.*/public void startPreview() {if (camera != null && !previewing) {camera.startPreview();previewing = true;}}/*** Tells the camera to stop drawing preview frames.*/public void stopPreview() {if (camera != null && previewing) {if (!useOneShotPreviewCallback) {camera.setPreviewCallback(null);}camera.stopPreview();previewCallback.setHandler(null, 0);autoFocusCallback.setHandler(null, 0);previewing = false;}}/*** A single preview frame will be returned to the handler supplied. The data will arrive as byte[]* in the message.obj field, with width and height encoded as message.arg1 and message.arg2,* respectively.** @param handler The handler to send the message to.* @param message The what field of the message to be sent.*/public void requestPreviewFrame(Handler handler, int message) {if (camera != null && previewing) {previewCallback.setHandler(handler, message);if (useOneShotPreviewCallback) {camera.setOneShotPreviewCallback(previewCallback);} else {camera.setPreviewCallback(previewCallback);}}}/*** Asks the camera hardware to perform an autofocus.** @param handler The Handler to notify when the autofocus completes.* @param message The message to deliver.*/public void requestAutoFocus(Handler handler, int message) {if (camera != null && previewing) {autoFocusCallback.setHandler(handler, message);//Log.d(TAG, "Requesting auto-focus callback");camera.autoFocus(autoFocusCallback);}}/*** Calculates the framing rect which the UI should draw to show the user where to place the* barcode. This target helps with alignment as well as forces the user to hold the device* far enough away to ensure the image will be in focus.** @return The rectangle to draw on screen in window coordinates.*/public Rect getFramingRect() {Point screenResolution = configManager.getScreenResolution();if (framingRect == null) {if (camera == null) {return null;}DisplayMetrics metrics = context.getResources().getDisplayMetrics();//定义扫描矿的宽和高分别为０．７倍的屏幕宽度和高度int width = (int)(metrics.widthPixels*0.7);int height = width;int leftOffset = (screenResolution.x - width) / 2;int topOffset = (screenResolution.y - height) / 2;framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height);Log.d(TAG, "Calculated framing rect: " + framingRect);}return framingRect;}/*** Like {@link #getFramingRect} but coordinates are in terms of the preview frame,* not UI / screen.*/public Rect getFramingRectInPreview() {if (framingRectInPreview == null) {Rect rect = new Rect(getFramingRect());Point cameraResolution = configManager.getCameraResolution();Point screenResolution = configManager.getScreenResolution();//modify here
//      rect.left = rect.left * cameraResolution.x / screenResolution.x;
//      rect.right = rect.right * cameraResolution.x / screenResolution.x;
//      rect.top = rect.top * cameraResolution.y / screenResolution.y;
//      rect.bottom = rect.bottom * cameraResolution.y / screenResolution.y;rect.left = rect.left * cameraResolution.y / screenResolution.x;rect.right = rect.right * cameraResolution.y / screenResolution.x;rect.top = rect.top * cameraResolution.x / screenResolution.y;rect.bottom = rect.bottom * cameraResolution.x / screenResolution.y;framingRectInPreview = rect;}return framingRectInPreview;}/*** 通过设置Camera打开闪光灯*/public void turnLightOn(){Log.e(TAG,"闪光灯相机=======没开");if (camera == null){Log.e(TAG,"闪光灯相机没开");return;}Log.e(TAG,"闪光灯相机====%%%%%%%===没开");Camera.Parameters parameters = camera.getParameters();if (parameters == null){return;}List flashModes = parameters.getSupportedFlashModes();if (flashModes == null){return;}String flashMode = parameters.getFlashMode();
//    Log.i(TAG, Flash mode:  + flashMode);
//    Log.i(TAG, Flash modes:  + flashModes);
//    // 闪光灯关闭状态if (!Camera.Parameters.FLASH_MODE_TORCH.equals(flashMode)){// Turn on the flashif (flashModes.contains(Camera.Parameters.FLASH_MODE_TORCH)){parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);camera.setParameters(parameters);camera.startPreview();}else{}}}/*** 通过设置Camera关闭闪光灯**/public void turnLightOff(){if (camera == null){Log.e(TAG,"闪光灯相机没开");return;}Camera.Parameters parameters = camera.getParameters();if (parameters == null){return;}List flashModes = parameters.getSupportedFlashModes();String flashMode = parameters.getFlashMode();// Check if camera flash existsif (flashModes == null){return;}// 闪光灯打开状态if (!Camera.Parameters.FLASH_MODE_OFF.equals(flashMode)){// Turn off the flashif (flashModes.contains(Camera.Parameters.FLASH_MODE_OFF)){parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);camera.setParameters(parameters);}else{Log.e(TAG, "FLASH_MODE_OFF not supported");}}}/*** Converts the result points from still resolution coordinates to screen coordinates.** @param points The points returned by the Reader subclass through Result.getResultPoints().* @return An array of Points scaled to the size of the framing rect and offset appropriately*         so they can be drawn in screen coordinates.*//*public Point[] convertResultPoints(ResultPoint[] points) {Rect frame = getFramingRectInPreview();int count = points.length;Point[] output = new Point[count];for (int x = 0; x < count; x++) {output[x] = new Point();output[x].x = frame.left + (int) (points[x].getX() + 0.5f);output[x].y = frame.top + (int) (points[x].getY() + 0.5f);}return output;}*//*** A factory method to build the appropriate LuminanceSource object based on the format* of the preview buffers, as described by Camera.Parameters.** @param data A preview frame.* @param width The width of the image.* @param height The height of the image.* @return A PlanarYUVLuminanceSource instance.*/public PlanarYUVLuminanceSource buildLuminanceSource(byte[] data, int width, int height) {Rect rect = getFramingRectInPreview();int previewFormat = configManager.getPreviewFormat();String previewFormatString = configManager.getPreviewFormatString();switch (previewFormat) {// This is the standard Android format which all devices are REQUIRED to support.// In theory, it's the only one we should ever care about.case PixelFormat.YCbCr_420_SP:// This format has never been seen in the wild, but is compatible as we only care// about the Y channel, so allow it.case PixelFormat.YCbCr_422_SP:return new PlanarYUVLuminanceSource(data, width, height, rect.left, rect.top,rect.width(), rect.height());default:// The Samsung Moment incorrectly uses this variant instead of the 'sp' version.// Fortunately, it too has all the Y data up front, so we can read it.if ("yuv420p".equals(previewFormatString)) {return new PlanarYUVLuminanceSource(data, width, height, rect.left, rect.top,rect.width(), rect.height());}}throw new IllegalArgumentException("Unsupported picture format: " +previewFormat + '/' + previewFormatString);}public Context getContext() {return context;}}

3、要修改扫描界面，自己画界面可在ＶiewfinderView中修改

ＶiewfinderView.java

package com.zm.app.zxing.view;import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.view.View;import com.example.qr_codescan.R;
import com.google.zxing.ResultPoint;
import java.util.Collection;
import java.util.HashSet;/*** Created by leiqi on 15-12-9.*/
public class ViewfinderView extends View {private static final String TAG = "log";/*** 刷新界面的时间*/private static final long ANIMATION_DELAY = 10L;private static final int OPAQUE = 0xFF;/*** 四个绿色边角对应的长度*/private int ScreenRate;/*** 四个绿色边角对应的宽度*/private static final int CORNER_WIDTH = 5;/*** 扫描框中的中间线的宽度*/private static final int MIDDLE_LINE_WIDTH = 5;/*** 扫描框中的中间线的与扫描框左右的间隙*/private static final int MIDDLE_LINE_PADDING = 5;/*** 中间那条线每次刷新移动的距离*/private static final int SPEEN_DISTANCE = 5;/*** 手机的屏幕密度*/private static float density;/*** 字体大小*/private static final int TEXT_SIZE = 18;private static final int TEXT_SIZE1 = 22;/*** 字体距离扫描框下面的距离*/private static final int TEXT_PADDING_TOP = 30;/*** 画笔对象的引用*/private Paint paint;/*** 中间滑动线的最顶端位置*/private int slideTop;/*** 中间滑动线的最底端位置*/private int slideBottom;/*** 将扫描的二维码拍下来，这里没有这个功能，暂时不考虑*/private Bitmap resultBitmap;private final int maskColor;private final int resultColor;private final int resultPointColor;private Collection<ResultPoint> possibleResultPoints;private Collection<ResultPoint> lastPossibleResultPoints;boolean isFirst;public ViewfinderView(Context context, AttributeSet attrs) {super(context, attrs);density = context.getResources().getDisplayMetrics().density;//将像素转换成dpScreenRate = (int) (20 * density);paint = new Paint();Resources resources = getResources();maskColor = resources.getColor(R.color.viewfinder_mask);resultColor = resources.getColor(R.color.result_view);resultPointColor = resources.getColor(R.color.possible_result_points);possibleResultPoints = new HashSet<ResultPoint>(5);}@Overridepublic 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 = com.zm.app.zxing.camera.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;}//获取屏幕的宽和高int width = canvas.getWidth();int height = canvas.getHeight();paint.setColor(resultBitmap != null ? resultColor : maskColor);//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 rectanglepaint.setAlpha(OPAQUE);canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint);} else {
//          //画扫描框上面的字
//          paint.setColor(Color.rgb(255,255,255));
//          paint.setTextSize(TEXT_SIZE1 * density);
//          paint.setAlpha(0x40);
//          paint.setTypeface(Typeface.create("System", Typeface.BOLD));
//          canvas.drawText(getResources().getString(R.string.Return_car), frame.left, (float) (frame.top - (float) TEXT_PADDING_TOP * density), paint);//画扫描框边上的角，总共8个部分paint.setColor(Color.rgb(33,134,116));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_DISTANCEslideTop += 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);//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));canvas.drawText(getResources().getString(R.string.scan_text), frame.left, (float) (frame.bottom + (float) TEXT_PADDING_TOP * density), 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);}}//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);}}public void drawViewfinder() {resultBitmap = null;invalidate();}/*** Draw a bitmap with the result points highlighted instead of the live* scanning display.** @param barcode An image of the decoded barcode.*/public void drawResultBitmap(Bitmap barcode) {resultBitmap = barcode;invalidate();}public void addPossibleResultPoint(ResultPoint point) {possibleResultPoints.add(point);}}

４、打开关闭闪光灯

打开关闭闪光灯直接调用

CameraManager.get().openLight();

CameraManager.get().offLight();

public void openLight(){if (camera != null) {Camera.Parameters parameter;parameter = camera.getParameters();parameter.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);camera.setParameters(parameter);}}public void offLight(){if (camera != null) {Camera.Parameters parameter;parameter = camera.getParameters();parameter.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);camera.setParameters(parameter);}}

【Android 学习】之二维码扫描开发（闪光灯功能）相关推荐

Android二维码扫描开发（一）：实现思路与原理
2019独角兽企业重金招聘Python工程师标准>>> Android二维码扫描开发(一):实现思路与原理 Android二维码扫描开发(二):YUV图像格式详解 Android二维 ...
android利用zbar二维码扫描-(解决中文乱码及扫描区域定义)
写在最前(这是对上一篇博文的问题做的更新[android利用zbar二维码扫描]) project下载 zbarLib编译project project下载0积分 bug 在2.3的系统中Hol ...
[转载]android利用zbar二维码扫描-(解决中文乱码及扫描区域定义)
写在最前(这是对上一篇博文的问题做的更新[android利用zbar二维码扫描]) 前天早上登陆CSDN时候一条消息:一网友提出了两点疑惑扫描框目前只是做的假象,是全屏的图片进行解析中文乱码现象 ...
Android 基于Zxing二维码扫描的光速实现
Android 十分钟光速实现二维码扫描前言在项目中要使用到二维码的相关内容,我们第一时间想到的是使用大名鼎鼎的zxing或者ZBar开源框架: github-zxing官方库的地址 github ...
Android 应用之二维码扫描登录
下面介绍二维码扫描登录原理, 首先需要web服务端,和app客户端. web服务端主要工作是生成二维码,检测客户端提交信息正确性,更新网页界面. app客户端主要工作是扫描二维码,提交账户信息(此不是 ...
Android实现一维二维码扫描生成功能(一)-zxing导入现有项目
前言目前二维码扫描功能很流行也非常成熟了,而zxing项目也是目前可以说是最流行的二维码扫描方面的开源项目了,很多大神都对zxing进行了封装,github上也有很多好用的二维码开源库,但是我更喜欢 ...
Android 9 实现二维码扫描处理(BGAQRCode-Android) 笔记
首先声明,本笔记是在下面这位大佬的代码基础上改的,本人会将实现过程中出现的问题和经验写在下面,本笔记可以结合github上作者的readme一起看: https://github.com/bingoo ...
Android快速实现二维码扫描--Zxing
Android中二维码扫描的最常用库是zxing和zbar,zxing项目地址为https://github.com/zxing/zxing,目前还有多个人在维护.zbar主要用C来写的,对速度有要求 ...
Android 集成zxing二维码扫描、自定义
项目主要有zxing的基本使用,包含扫描回调.连续扫描.自定义扫描框: 一.依赖库 implementation 'com.journeyapps:zxing-android-embedded:4.3 ...

【Android 学习】之二维码扫描开发（闪光灯功能）

【Android 学习】之二维码扫描开发（闪光灯功能）相关推荐

最新文章

热门文章