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。

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。

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。

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