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

           

posted on 2014-08-27 13:58  大有@  阅读(929)  评论(0编辑  收藏  举报

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