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google Zxing实现二维码、条形码扫描,仿微信二维码扫描效果

2015-07-28 Android 707 ℃ 0 评论

    了解二维码这个东西还是从微信中,当时微信推出二维码扫描功能,自己感觉挺新颖的,从一张图片中扫一下竟然能直接加好友,不可思议啊,那时候还不了解二维码,呵呵,然后做项目的时候,老板说要加上二维码扫描功能,然后自己的屁颠屁颠的去百度,google啥的,发现很多朋友都有介绍二维码扫描的功能,然后我就跟着人家的介绍自己搞起了二维码扫描功能,跟着人家的帖子,很快我的项目就加入了扫描二维码的功能,然后自己还很开心。


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

20130821223912515.jpg

  • 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

sss.jpg

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,

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。


转载请注明出处:
http://blog.csdn.net/xiaanming/article/details/10163203

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