如何使用Zxing應用程序掃描android中的位圖？

Question

我有一個接收收據照片的應用程序，我想使用Zxing來閱讀此位圖並提取QR碼和條碼信息。那可能嗎？如果是的話，你能分享一下Android的代碼嗎？

Answer 1

它非常簡單，你需要startActivityforResult，類似的來電呼叫其他活動..

在你行動時，掃描被調用，你需要調用以下：

public InvokeScan() 
{ 
    mAppPAckage="com.google.zxing.client.android.SCAN" 
    Intent intentScan = new Intent(mAppPackage); 
    intentScan.addCategory(Intent.CATEGORY_DEFAULT); 


    // set the desired barcode types 
    intentScan.putExtra("SCAN_FORMATS", stringDesiredBarcodeFormats); 

    final PackageManager packageManager = activity.getPackageManager(); 
    List<ResolveInfo> list = packageManager.queryIntentActivities(intentScan, 
          PackageManager.MATCH_DEFAULT_ONLY); 


    activity.startActivityForResult(intentScan,REQUEST_CODE); 

onActivityResult，你需要捕獲結果

protected void onActivityResult(int requestCode, int resultCode, Intent data) 
    { 
     if (resultCode == Activity.RESULT_OK) 
     { 
      String desiredBarCodeFormat = BarCodeActivity.sDesiredBarcodeFormatValue;*/ 
      String contents = intent.getStringExtra(activityBundleName); 
      String formatName = intent.getStringExtra(desiredBarCodeFormat); 

      //do whatever you want from contents. 
     } 
    } 

內容將是您需要的條形碼號碼。

Answer 2

ZXing有各種各樣的叉子可以使用。

例如：https://zxingnet.codeplex.com/

// create a barcode reader instance 
IBarcodeReader reader = new BarcodeReader(); 
// load a bitmap 
var barcodeBitmap = (Bitmap)Bitmap.LoadFrom("C:\\sample-barcode-image.png"); 
// detect and decode the barcode inside the bitmap 
var result = reader.Decode(barcodeBitmap); 
// do something with the result 
if (result != null) 
{ 
    txtDecoderType.Text = result.BarcodeFormat.ToString(); 
    txtDecoderContent.Text = result.Text; 
} 

Answer 3

如果你不想堅持到斑馬線，你可以去Barcode Scanning Apis可以從谷歌Play業務7.8版本。這有能力讀取各種條形碼。它可以將圖像作爲位圖或直接掃描條形碼。假設您已從圖庫中獲取圖像並將其轉換爲位圖。請在下面的代碼中找到使用此庫發送要掃描的條形碼圖像的代碼。

Frame frame = new Frame.Builder().setBitmap(bitmap).build(); 
    BarcodeDetector barcodeDetector = new BarcodeDetector.Builder(context) 
        .build(); 
if(barcode.isOperational()){ 
    SparseArray<Barcode> sparseArray = barcodeDetector.detect(frame); 
       if(sparseArray != null && sparseArray.size() > 0){ 
        for (int i = 0; i < sparseArray.size(); i++){ 
             Log.d(LOG_TAG, "Value: " + sparseArray.valueAt(i).rawValue + "----" + sparseArray.valueAt(i).displayValue); 
             Toast.makeText(LOG_TAG, sparseArray.valueAt(i).rawValue, Toast.LENGTH_SHORT).show(); 

            } 
       }else { 
        Log.e(LOG_TAG,"SparseArray null or empty"); 
       } 

}else{ 
    Log.e(LOG_TAG, "Detector dependencies are not yet downloaded"); 
} 

在你的build.gradle文件，包括根據依賴關係部分如下：編譯 'com.google.android.gms：發揮服務：7.8 +。' 並添加以下清單權限：

<uses-feature android:name="android.hardware.camera" /> 
     <uses-feature android:name="android.hardware.camera.autofocus" /> 

     <uses-permission android:name="android.permission.INTERNET" /> 
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
     <uses-permission android:name="android.permission.CAMERA" /> 
     <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" /> 
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> 
    <uses-feature android:name="android.hardware.camera" /> 
     <uses-feature android:name="android.hardware.camera.autofocus" /> 

     <uses-permission android:name="android.permission.INTERNET" /> 
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
     <uses-permission android:name="android.permission.CAMERA" /> 
     <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" /> 
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> 

    <!-- Meta data for google play services: --> 

    <meta-data 
       android:name="com.google.android.gms.version" 
       android:value="@integer/google_play_services_version" /> 

    <!-- Meta data for first time install/run time dependencies to be downloaded for getting barcode detector operational --> 

    <meta-data 
       android:name="com.google.android.gms.vision.DEPENDENCIES" 
       android:value="barcode" /> 

有關此api的詳細用法，請參閱Github Sample，關注Code Lab,Documentation。