Android基于google Zxing实现各类二维码扫描效果

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。

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 
 * 
 *  * 
 * 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。

大家可以参考专题：java二维码进行学习

以上就是本文的全部内容，希望对大家学习android软件编程有所帮助。