亲宝软件园·资讯

展开

Android实现各类二维码扫描效果 Android基于google Zxing实现各类二维码扫描效果

人气:0
想了解Android基于google Zxing实现各类二维码扫描效果的相关内容吗，在本文为您仔细讲解Android实现各类二维码扫描效果的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：android二维码扫描,Zxing,Android二维码效果，下面大家一起来学习吧。

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

/** 
 * 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。

加载全部内容
相关教程
猜你喜欢
用户评论