Android基於google Zxing實現各類二維碼掃描效果

隨著微信的到來，二維碼越來越火爆，隨處能看到二維碼，比如商城裡面，肯德基，餐廳等等，對於二維碼掃描我們使用的是google的開源框架Zxing,我們可以去http://code.google.com/p/zxing/下載原始碼和Jar包，之前我專案中的二維碼掃描功能只實現了掃描功能，其UI真的是其醜無比，一個好的應用軟體，其UI介面也要被大眾所接納，不然人家就不會用你的軟體啦，所以說應用軟體功能和介面一樣都很重要，例如微信，相信微信UI被很多應用軟體所模仿，我也仿照微信掃描二維碼效果模仿，雖然沒有微信做的那麼精緻，但是效果還是可以的，所以將自己修改UI的代碼和掃描二維碼的代碼分享給大家，一是自己以後項目遇到同樣的功能直接拷貝來用，二是給還沒加入二維碼功能的人一個參考，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，接下來跟著我一步一步來實現此項功能，裡面去除了很多不必要的文件

我們先看下項目的結構

如果你項目也想加入此功能，你直接將com.mining.app.zxing.camera ，com.mining.app.zxing.decoding，com.mining.app.zxing.view這三個包拷貝到你的專案中，然後引入相對應的資源進去，我也是從我的專案中直接引用過來的，包名都沒改呢，當然還需要引用Zxing.jar

com.example.qr_codescan包裡面有一個MipcaActivityCapture,也是直接引入我之前項目的代碼的，這個Activity主要處理掃描界面的類，比如，掃描成功有聲音和振動等等，主要關注裡面的handleDecode(Result result, Bitmap barcode)方法，掃描完成之後將掃描到的結果和二維碼的bitmap當初步參數傳遞到handleDecode(Result result, Bitmap barcode)裡面，我們只需要在裡面寫出相對應的處理代碼即可，其他的地方都不用改得，我這裡處理掃描結果和掃描拍的照片

/** 
 * 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(); 
}

我對MipcaActivityCapture界面的佈局做了自己的改動，先看下效果圖，主要用到FrameLayout,裡面嵌套RelativeLayout。

版面碼如下

<?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>

   

在裡面我將界面上面部分寫在另一個佈局裡面，然後include進來，因為這個項目還供title在我專案中使用拷貝出來的

<?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>

   

在我這個demo裡面，有一個主界面MainActivity，裡面一個Button， 一個ImageView和一個TextView,點擊Button進入到二維碼掃描界面，當掃描OK的時候，回到主介面，將掃描的結果顯示到TextView，將圖片顯示到ImageView裡面，然後你可以不處理圖片，我這裡隨帶的加上圖片，主界面的佈局很簡單如下

<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裡面的程式碼如下，裡面的功能在上面已經說了

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;
    }
  }  
  
}

   

上面的程式碼還是比較簡單，但是要想做出像微信那樣隻的掃描框，緊緊上面的程式碼是沒有那種效果的，我們必須重寫com.mining.app.zxing.view包下面的ViewfinderView類，微信裡面的都是用的圖片，我是自己畫出來的，代碼註釋的比較清楚，大家直接看代碼吧，相信你能理解的，如果你要修改掃描框的大小，去CameraManager類別裡面修改

/*
 * 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);
  }
  
}

   

上面的程式碼中，中間那根線微信是用的圖片，我這裡是畫的，如​​果你想更模擬點就將下面的程式碼

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);

   

改成

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)

   

用那條掃描線自己去微信裡面找一下微信,然後解壓就行了

畫掃描框下面字體的程式碼需要修改下，這樣子能根據字體自動排列在中間，如果字太長我沒有處理，那個要自動換行，你可以自行處理

rrreee

   

🎜 🎜運行介面截圖，其中中間的那根綠色的線會上下移動，跟微信的效果差不多，當然運行你還需要相對應的權限問題。 🎜🎜🎜🎜

The above is the entire content of this article. I hope it will be helpful for everyone to learn Android software programming.

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