Android基于google Zxing實現各類二維碼掃描效果

2020-04-11 10:48:41

字體：大中小

來源：轉載

供稿：網友

隨著微信的到來，二維碼越來越火爆，隨處能看到二維碼，比如商城里面，肯德基，餐廳等等，對于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么精致，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，一是自己以后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，里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，然后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包里面有一個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，主要關注里面的handleDecode(Result result, Bitmap barcode)方法，掃描完成之后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)里面，我們只需要在里面寫出相對應的處理代碼即可，其他的地方都不用改得，我這里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,里面嵌套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>

在里面我將界面上面部分寫在另一個布局里面，然后include進來，因為這個activity_title在我項目里面還供其他的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里面，有一個主界面MainActivity，里面一個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里面，然后你可以不處理圖片，我這里隨帶的加上圖片，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里面的代碼如下，里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，這里用的是startActivityForResult跳轉   //掃描完了之后調到該界面   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，微信里面的都是用的圖片，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里面修改   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，我這里是畫的，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里面找一下，我貼出來的失真了，下載微信apk,將后綴名改成zip,然后解壓就行了
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。