• 基于google Zxing实现二维码、条形码扫描,仿微信二维码扫描效果


    随着微信的到来,二维码越来越火爆,随处能看到二维码,比如商城里面,肯德基,餐厅等等,对于二维码扫描我们使用的是google的开源框架Zxing,我们可以去http://code.google.com/p/zxing/下载源码和Jar包,之前我项目中的二维码扫描功能只实现了扫描功能,其UI真的是其丑无比,一个好的应用软件,其UI界面也要被大众所接纳,不然人家就不会用你的软件啦,所以说应用软件功能和界面一样都很重要,例如微信,相信微信UI被很多应用软件所模仿,我也仿照微信扫描二维码效果进行模仿,虽然没有微信做的那么精致,但是效果还是可以的,所以将自己修改UI的代码和扫描二维码的代码分享给大家,一是自己以后项目遇到同样的功能直接拷贝来用,二是给还没有加入二维码功能的人一个参考,站在巨人的肩膀上,哈哈,我之前也是站在巨人的肩膀上加上此功能,接下来跟着我一步一步来实现此项功能,里面去除了很多不必要的文件

    我们先看下项目的结构

    • 如果你项目也想加入此功能,你直接将com.mining.app.zxing.camera,com.mining.app.zxing.decoding,com.mining.app.zxing.view这三个包拷贝到你的项目中,然后引入相对应的资源进去,我也是从我的项目中直接引用过来的,包名都没改呢,当然还需要引用Zxing.jar
    • com.example.qr_codescan包里面有一个MipcaActivityCapture,也是直接引入我之前项目的代码的,这个Activity主要处理扫描界面的类,比如,扫描成功有声音和振动等等,主要关注里面的handleDecode(Result result, Bitmap barcode)方法,扫描完成之后将扫描到的结果和二维码的bitmap当初参数传递到handleDecode(Result result, Bitmap barcode)里面,我们只需要在里面写出相对应的处理代码即可,其他的地方都不用改得,我这里处理扫描结果和扫描拍的照片
          /**
           * 处理扫描结果
           * @param result
           * @param barcode
           */
          public void handleDecode(Result result, Bitmap barcode) {
              inactivityTimer.onActivity();
              playBeepSoundAndVibrate();
              String resultString = result.getText();
              if (resultString.equals("")) {
                  Toast.makeText(MipcaActivityCapture.this, "Scan failed!", Toast.LENGTH_SHORT).show();
              }else {
                  Intent resultIntent = new Intent();
                  Bundle bundle = new Bundle();
                  bundle.putString("result", resultString);
                  bundle.putParcelable("bitmap", barcode);
                  resultIntent.putExtras(bundle);
                  this.setResult(RESULT_OK, resultIntent);
              }
              MipcaActivityCapture.this.finish();
          }
      • 我对MipcaActivityCapture界面的布局做了自己的改动,先看下效果图,主要是用到FrameLayout,里面嵌套RelativeLayout,里面的图片也是从微信里面拿出来的,平常我看到需要什么图片就去微信里面找,没有美工的公司的程序员就是苦逼

      布局代码如下

      <?xml version="1.0" encoding="utf-8"?>
      <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:layout_width="fill_parent"
              android:layout_height="fill_parent" >
      
          <RelativeLayout
              android:layout_width="fill_parent"
              android:layout_height="fill_parent" >
      
              <SurfaceView
                  android:id="@+id/preview_view"
                  android:layout_width="fill_parent"
                  android:layout_height="fill_parent"
                  android:layout_gravity="center" />
      
              <com.mining.app.zxing.view.ViewfinderView
                  android:id="@+id/viewfinder_view"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content" />
      
              <include
                  android:id="@+id/include1"
                  android:layout_width="fill_parent"
                  android:layout_height="wrap_content"
                  android:layout_alignParentTop="true"
                  layout="@layout/activity_title" />
          </RelativeLayout>
      
      </FrameLayout>

      在里面我将界面上面部分写在另一个布局里面,然后include进来,因为这个activity_title在我项目里面还供其他的Activity使用,我也是直接拷贝出来的

      <?xml version="1.0" encoding="utf-8"?>
      <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:layout_width="fill_parent"
          android:layout_height="wrap_content"
          android:background="@drawable/mmtitle_bg_alpha" >
      
          <Button
              android:id="@+id/button_back"
              android:layout_width="75.0dip"
              android:text="返回"
              android:background="@drawable/mm_title_back_btn"
              android:textColor="@android:color/white"
              android:layout_height="wrap_content"
              android:layout_centerVertical="true"
              android:layout_marginLeft="2dip" />
      
          <TextView
              android:id="@+id/textview_title"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_alignBaseline="@+id/button_back"
              android:layout_alignBottom="@+id/button_back"
              android:layout_centerHorizontal="true"
              android:gravity="center_vertical"
              android:text="二维码扫描"
              android:textColor="@android:color/white"
              android:textSize="18sp" />
      
      </RelativeLayout>
      • 在我这个demo里面,有一个主界面MainActivity,里面一个Button, 一个ImageView和一个TextView,点击Button进入到二维码扫描界面,当扫描OK的时候,回到主界面,将扫描的结果显示到TextView,将图片显示到ImageView里面,然后你可以不处理图片,我这里随带的加上图片,主界面的布局很简单如下
        <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:tools="http://schemas.android.com/tools"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="#ffe1e0de" >
        
            <Button
                android:id="@+id/button1"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentTop="true"
                android:text="扫描二维码" />
        
            <TextView
                android:id="@+id/result"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_below="@+id/button1"
                android:lines="2"
                android:gravity="center_horizontal"
                android:textColor="@android:color/black"
                android:textSize="16sp" />
        
            <ImageView
                android:id="@+id/qrcode_bitmap"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:layout_alignParentLeft="true"
                android:layout_below="@+id/result"/>
        </RelativeLayout>
        • MainActivity里面的代码如下,里面的功能在上面已经说了
          package com.example.qr_codescan;
          
          
          import android.app.Activity;
          import android.content.Intent;
          import android.graphics.Bitmap;
          import android.os.Bundle;
          import android.view.View;
          import android.view.View.OnClickListener;
          import android.widget.Button;
          import android.widget.ImageView;
          import android.widget.TextView;
          
          public class MainActivity extends Activity {
              private final static int SCANNIN_GREQUEST_CODE = 1;
              /**
               * 显示扫描结果
               */
              private TextView mTextView ;
              /**
               * 显示扫描拍的图片
               */
              private ImageView mImageView;
              
          
              @Override
              protected void onCreate(Bundle savedInstanceState) {
                  super.onCreate(savedInstanceState);
                  setContentView(R.layout.activity_main);
                  
                  mTextView = (TextView) findViewById(R.id.result); 
                  mImageView = (ImageView) findViewById(R.id.qrcode_bitmap);
                  
                  //点击按钮跳转到二维码扫描界面,这里用的是startActivityForResult跳转
                  //扫描完了之后调到该界面
                  Button mButton = (Button) findViewById(R.id.button1);
                  mButton.setOnClickListener(new OnClickListener() {
                      
                      @Override
                      public void onClick(View v) {
                          Intent intent = new Intent();
                          intent.setClass(MainActivity.this, MipcaActivityCapture.class);
                          intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                          startActivityForResult(intent, SCANNIN_GREQUEST_CODE);
                      }
                  });
              }
              
              
              @Override
              protected void onActivityResult(int requestCode, int resultCode, Intent data) {
                  super.onActivityResult(requestCode, resultCode, data);
                  switch (requestCode) {
                  case SCANNIN_GREQUEST_CODE:
                      if(resultCode == RESULT_OK){
                          Bundle bundle = data.getExtras();
                          //显示扫描到的内容
                          mTextView.setText(bundle.getString("result"));
                          //显示
                          mImageView.setImageBitmap((Bitmap) data.getParcelableExtra("bitmap"));
                      }
                      break;
                  }
              }    
          
          }
          • 上面的代码还是比较简单,但是要想做出像微信那样只的扫描框,紧紧上面的代码是没有那种效果的,我们必须重写com.mining.app.zxing.view包下面的ViewfinderView类,微信里面的都是用的图片,我是自己画出来的,代码注释的比较清楚,大家直接看代码吧,相信你能理解的,如果你要修改扫描框的大小,去CameraManager类里面修改
            /*
             * 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.
             */
            
            package com.mining.app.zxing.view;
            
            import java.util.Collection;
            import java.util.HashSet;
            
            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 com.mining.app.zxing.camera.CameraManager;
            
            /**
             * This view is overlaid on top of the camera preview. It adds the viewfinder
             * rectangle and partial transparency outside it, as well as the laser scanner
             * animation and result points.
             * 
             */
            public final 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 = 10;
                /**
                 * 扫描框中的中间线的宽度
                 */
                private static final int MIDDLE_LINE_WIDTH = 6;
                
                /**
                 * 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 = 16;
                /**
                 * 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;
                
                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dp
                    ScreenRate = (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);
                }
            
                @Override
                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();
                    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 rectangle
                        paint.setAlpha(OPAQUE);
                        canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint);
                    } else {
            
                        //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.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);
                }
            
            }

            上面的代码中,中间那根线微信是用的图片,我这里是画的,如果你想更加仿真点就将下面的代码

            canvas.drawRect(frame.left + MIDDLE_LINE_PADDING, slideTop - MIDDLE_LINE_WIDTH/2, frame.right - MIDDLE_LINE_PADDING,slideTop + MIDDLE_LINE_WIDTH/2, paint);

            改成

            Rect lineRect = new Rect();
                        lineRect.left = frame.left;
                        lineRect.right = frame.right;
                        lineRect.top = slideTop;
                        lineRect.bottom = slideTop + 18;
                        canvas.drawBitmap(((BitmapDrawable)(getResources().getDrawable(R.drawable.qrcode_scan_line))).getBitmap(), null, lineRect, paint);

            那条扫描线自己去微信里面找一下,我贴出来的失真了,下载微信apk,将后缀名改成zip,然后解压就行了

            画扫描框下面字体的代码需要修改下,这样子能根据字体自动排列在中间,如果字太长我没有处理,那个要自动换行,你可以自行处理

            paint.setColor(Color.WHITE);  
            paint.setTextSize(TEXT_SIZE * density);  
            paint.setAlpha(0x40);  
            paint.setTypeface(Typeface.DEFAULT_BOLD); 
            String text = getResources().getString(R.string.R.string.scan_text);
            float textWidth = paint.measureText(text);
            
            canvas.drawText(text, (width - textWidth)/2, (float) (frame.bottom + (float)TEXT_PADDING_TOP *density), paint)

            运行界面截图,其中中间的那根绿色的线会上下移动,跟微信的效果差不多,当然运行你还需要相对应的权限问题,有兴趣的朋友可以去下载demo

            从8点多写这篇博客写到现在,看起来这么点字,但实际上还是比较耗时间的,如果你觉得这篇文章对你有帮助,你就顶一下,哈哈,洗澡睡觉去了,上面的项目中还有一些资源文件我没有贴出来,想要看效果可以下载源码

            项目源码,点击下载

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  • 原文地址:https://www.cnblogs.com/a354823200/p/3939310.html
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