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 Android教程網 >> Android技術 >> 關於Android編程 >> Android基於google Zxing實現各類二維碼掃描效果

Android基於google Zxing實現各類二維碼掃描效果

編輯:關於Android編程

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/下載源碼和Jar包,之前我項目中的二維碼掃描功能只實現了掃描功能,其UI真的是其丑無比,一個好的應用軟件,其UI界面也要被大眾所接納,不然人家就不會用你的軟件啦,所以說應用軟件功能和界面一樣都很重要,例如微信,相信微信UI被很多應用軟件所模仿,我也仿照微信掃描二維碼效果進行模仿,雖然沒有微信做的那麼精致,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,二是給還沒有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項目中,然後引入相對應的資源進去,我也是從我的項目中直接引用過來的,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
/** 
 * 處理掃描結果 
 * @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界面的布局做了自己的改動,先看下效果圖,主要是用到FrameLayout,裡面嵌套RelativeLayout。

布局代碼如下

<?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布局裡面,然後include進來,因為這個activity_title在我項目裡面還供其他的Activity使用,我也是直接拷貝出來的

<?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="二維碼掃描" 
    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,回到主界面,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,主界面的布局很簡單如下

<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="掃描二維碼" /> 
 
  <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裡面的代碼如下,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; 
  /** 
   * 顯示掃描結果 
   */ 
  private TextView mTextView ; 
  /** 
   * 顯示掃描拍的圖片 
   */ 
  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); 
     
    //點擊按鈕跳轉到二維碼掃描界面,這裡用的是startActivityForResult跳轉 
    //掃描完了之後調到該界面 
    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(); 
        //顯示掃描到的內容 
        mTextView.setText(bundle.getString("result")); 
        //顯示 
        mImageView.setImageBitmap((Bitmap) data.getParcelableExtra("bitmap")); 
      } 
      break; 
    } 
  }   
 
} 

上面的代碼還是比較簡單,但是要想做出像微信那樣只的掃描框,緊緊上面的代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,代碼注釋的比較清楚,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"; 
  /** 
   * 刷新界面的時間 
   */ 
  private static final long ANIMATION_DELAY = 10L; 
  private static final int OPAQUE = 0xFF; 
 
  /** 
   * 四個綠色邊角對應的長度 
   */ 
  private int ScreenRate; 
   
  /** 
   * 四個綠色邊角對應的寬度 
   */ 
  private static final int CORNER_WIDTH = 10; 
  /** 
   * 掃描框中的中間線的寬度 
   */ 
  private static final int MIDDLE_LINE_WIDTH = 6; 
   
  /** 
   * 掃描框中的中間線的與掃描框左右的間隙 
   */ 
  private static final int MIDDLE_LINE_PADDING = 5; 
   
  /** 
   * 中間那條線每次刷新移動的距離 
   */ 
  private static final int SPEEN_DISTANCE = 5; 
   
  /** 
   * 手機的屏幕密度 
   */ 
  private static float density; 
  /** 
   * 字體大小 
   */ 
  private static final int TEXT_SIZE = 16; 
  /** 
   * 字體距離掃描框下面的距離 
   */ 
  private static final int TEXT_PADDING_TOP = 30; 
   
  /** 
   * 畫筆對象的引用 
   */ 
  private Paint paint; 
   
  /** 
   * 中間滑動線的最頂端位置 
   */ 
  private int slideTop; 
   
  /** 
   * 中間滑動線的最底端位置 
   */ 
  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; 
    //將像素轉換成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) { 
    //中間的掃描框,你要修改掃描框的大小,去CameraManager裡面修改 
    Rect frame = CameraManager.get().getFramingRect(); 
    if (frame == null) { 
      return; 
    } 
     
    //初始化中間線滑動的最上邊和最下邊 
    if(!isFirst){ 
      isFirst = true; 
      slideTop = frame.top; 
      slideBottom = frame.bottom; 
    } 
     
    //獲取屏幕的寬和高 
    int width = canvas.getWidth(); 
    int height = canvas.getHeight(); 
 
    paint.setColor(resultBitmap != null ? resultColor : maskColor); 
     
    //畫出掃描框外面的陰影部分,共四個部分,掃描框的上面到屏幕上面,掃描框的下面到屏幕下面 
    //掃描框的左邊面到屏幕左邊,掃描框的右邊到屏幕右邊 
    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 { 
 
      //畫掃描框邊上的角,總共8個部分 
      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); 
 
       
      //繪制中間的線,每次刷新界面,中間的線往下移動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); 
       
       
      //畫掃描框下面的字 
      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); 
        } 
      } 
 
       
      //只刷新掃描框的內容,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,如果你想更加仿真點就將下面的代碼

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); 

那條掃描線自己去微信裡面找一下,我貼出來的失真了,下載微信apk,將後綴名改成zip,然後解壓就行了
畫掃描框下面字體的代碼需要修改下,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

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) 

運行界面截圖,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。

以上就是本文的全部內容,希望對大家學習Android軟件編程有所幫助。

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