Android，尝试使用 “NotFoundException” 条码扫描器时出现 “zxing”

Question

我在尝试使用“zxing”条形码扫描仪解码 Android 相机捕获的图像时遇到“NotFoundException”。

我研究了 Stackoverflow 网站和 zxing 文档，帖子表明 zxing API 无法找到开始扫描的条码，因为图像可能太大。我试过以原始尺寸的 50%、30%、25% 等不同尺寸进行扫描，我还尝试了 10 种不同的条形码，相机拍摄图像并保存在 sd 卡上，但无法扫描图像的位图在内存中。

负责Camera操作&扫描的Activity是(ScanVinFromBarcodeActivity.java)，负责拍照的方法是onPictureTaken(byte[] imgData, Camera camera)，负责解码的方法是图像是公共(public)字符串 decodeBitmapToString(BinaryBitmap 位图)。

请参阅下面的 ScanVinFromBarcodeActivity.java:

   package com.ty.tyownerspoc.barcode;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Hashtable;

import com.google.zxing.BinaryBitmap;
import com.google.zxing.ChecksumException;
import com.google.zxing.DecodeHintType;
import com.google.zxing.FormatException;
import com.google.zxing.MultiFormatReader; //found via import at compile time, however was found at run time 
import com.google.zxing.NotFoundException;
import com.google.zxing.RGBLuminanceSource;//found via import at compile time, however was found at run time 
import com.google.zxing.Reader;
import com.google.zxing.Result;
import com.google.zxing.common.HybridBinarizer;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.ImageFormat;
import android.graphics.Matrix;
import android.graphics.Point;
import android.hardware.Camera;
import android.hardware.Camera.CameraInfo;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.PictureCallback;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.Display;
import android.view.SurfaceView;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.ty.tyownerspoc.R;

public class ScanVinFromBarcodeActivity extends Activity {

    private Camera globalCamera;
    private int cameraId = 0;
    private TextView VINtext = null;
    private View scanButton = null;
    // bitmap from camera
    private Bitmap bmpOfTheImageFromCamera = null;
    // global flag whether a camera has been detected
    private boolean isThereACamera = false;
    // surfaceView for preview object
    private FrameLayout frameLayoutBarcodeScanner = null;
    private CameraPreview newCameraPreview = null;
    private SurfaceView surfaceViewBarcodeScanner = null;

    /*
     * This method , finds FEATURE_CAMERA, opens the camera, set parameters ,
     * add CameraPreview to layout, set camera surface holder, start preview
     */
    private void initializeGlobalCamera() {
        try {
            if (!getPackageManager().hasSystemFeature(
                    PackageManager.FEATURE_CAMERA)) {
                Toast.makeText(this, "No camera on this device",
                        Toast.LENGTH_LONG).show();
            } else { // check for front camera ,and get the ID
                cameraId = findFrontFacingCamera();
                if (cameraId < 0) {

                    Toast.makeText(this, "No front facing camera found.",
                            Toast.LENGTH_LONG).show();
                } else {

                    Log.d("ClassScanViewBarcodeActivity",
                            "camera was found , ID: " + cameraId);
                    // camera was found , set global camera flag to true
                    isThereACamera = true;
                    // OPEN
                    globalCamera = Camera.open(cameraId);

                    // pass surfaceView to CameraPreview
                    newCameraPreview = new CameraPreview(this, globalCamera);
                    // pass CameraPreview to Layout
                    frameLayoutBarcodeScanner.addView(newCameraPreview);
                    try {
                        globalCamera
                                .setPreviewDisplay(surfaceViewBarcodeScanner
                                        .getHolder());
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    // PREVIEW
                    globalCamera.startPreview();

                    Log.d("ClassScanViewBarcodeActivity",
                            "camera opened & previewing");
                }
            }// end else ,check for front camera
        }// end try
        catch (Exception exc) {

            // in case of exception release resources & cleanup
            if (globalCamera != null) {
                globalCamera.stopPreview();
                globalCamera.setPreviewCallback(null);
                globalCamera.release();
                globalCamera = null;

            }
            Log.d("ClassScanViewBarcodeActivity initializeGlobalCamera() exception:",
                    exc.getMessage());
        }// end catch
    }

    // onCreate, instantiates layouts & surfaceView used for video preview
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_barcode_vin_scanner);
        Log.d("ClassScanViewBarcodeActivity", "onCreate ");

        // create surfaceView for previewing of camera image
        frameLayoutBarcodeScanner = (FrameLayout) findViewById(R.id.FrameLayoutForPreview);
        surfaceViewBarcodeScanner = (SurfaceView) findViewById(R.id.surfaceViewBarcodeScanner);

        initializeGlobalCamera();

        // create text area & scan button
        VINtext = (TextView) findViewById(R.id.mytext);
        scanButton = findViewById(R.id.webbutton);
        // on click listener, onClick take a picture
        scanButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                try {

                    // if true take a picture
                    if (isThereACamera) {
                        Log.d("ClassScanViewBarcodeActivity",
                                "setOnClickListener() isThereACamera: "+ isThereACamera);

                        //set picture format to JPEG, everytime makesure JPEg callback is called 
                         Parameters parameters = globalCamera.getParameters();              
                         parameters.setPictureFormat(ImageFormat.JPEG);
                         globalCamera.setParameters(parameters);                         
                         //take pic , should call Callback 
                        globalCamera.takePicture(null, null, jpegCallback);



                    }

                }// end try
                catch (Exception exc) {

                    // in case of exception                         if (globalCamera != null) {
                        globalCamera.stopPreview();
                        globalCamera.setPreviewCallback(null);
                        globalCamera.release();
                        globalCamera = null;

                    }

                    exc.printStackTrace();
                }// end catch

            }// end on Click
        });// end OnClickListener() implementation

    }// end onCreate

    @Override
    protected void onResume() {

        Log.d("ClassScanViewBarcodeActivity, onResume() globalCamera:",
                String.valueOf(globalCamera));

        if (globalCamera != null) {
            // START PREVIEW
            globalCamera.startPreview();
        } else {
            initializeGlobalCamera();
        }

        super.onResume();
    }

    @Override
    protected void onStop() {

        if (globalCamera != null) {
            globalCamera.stopPreview();
            globalCamera.setPreviewCallback(null);
            globalCamera.release();
            globalCamera = null;
        }
        super.onStop();
    }

    @Override
    protected void onPause() {
        if (globalCamera != null) {
            globalCamera.stopPreview();
            globalCamera.setPreviewCallback(null);
            globalCamera.release();
            globalCamera = null;
        }
        super.onPause();
    }// end onPause()

    //callback used by takePicture()
    /*
     * Implement PictureCallback's onPictureTaken(byte[] imgData, Camera camera) method.
     * 1) downsample the image via  options.inSampleSize , in order to make saving faster & lass error prone, 
     * without downsampling the image takes to long to save & we get memory exceptions.
     * 2) create bitmap 
     * 3) Might scale image to help zxing computationally by reducing image size 
     * 4)save image to sd card for testing & sanity check to see if actual image was taken 
     * 5) decode the VIN & set the value of GUI text component*/
    PictureCallback jpegCallback = new PictureCallback() {


        public void onPictureTaken(byte[] imgData, Camera camera) {
            BinaryBitmap bitmap;
            try {

                Log.d("ClassScanViewBarcodeActivity" ,"onPictureTaken()");              
                /*                   Implement PictureCallback's onPictureTaken(byte[] imgData, Camera camera) method.
                 1) down-sample the image via  options.inSampleSize , in order to make image resolution smaller & prevent MemoryOutOfBounds exception.*/

                BitmapFactory.Options options = new BitmapFactory.Options();
                  options.inSampleSize = 2; 
                 // 2) create bitmap 
                bmpOfTheImageFromCamera = BitmapFactory.decodeByteArray(
                        imgData, 0, imgData.length,options);

                if (bmpOfTheImageFromCamera != null) {

                    //3)  scale image to help zxing computationally by reducing image size
                    int height = bmpOfTheImageFromCamera.getWidth();
                    int width =     bmpOfTheImageFromCamera.getWidth();

                    double scale = 0.50; //I used half size 0.5  ,and  1/4 size but still the barcode can't be found 
                    int newHeight = (int) (height * scale);
                    int newWidth = (int) (width * scale);


                    Log.d("createScaledBitmap()","old width: "+width +" old height: "+height+" new width: "+newWidth+" new height"+newHeight);

                            String.valueOf(bmpOfTheImageFromCamera.getByteCount());
                            //resize 
                    Bitmap resizedBitmap = Bitmap.createScaledBitmap(bmpOfTheImageFromCamera,newWidth , newHeight, true);

                    Matrix rotationMatrix90CounterClockWise = new Matrix();
                    rotationMatrix90CounterClockWise.postRotate(90);
                    //roatate to correct orientation
                    resizedBitmap = Bitmap.createBitmap(resizedBitmap ,0,0,newWidth , newHeight,rotationMatrix90CounterClockWise,true);


                    //get back bytes from Bitmap in order to save bytes on sd card 
                    ByteArrayOutputStream baoStream = new ByteArrayOutputStream();
                    resizedBitmap.compress(Bitmap.CompressFormat.JPEG, 100, baoStream);
                    byte [] bytesImage = baoStream.toByteArray();


                    //4) save image to sd card for testing & sanity check to see if actual image was taken 
                    savePicture(bytesImage  , scale);


                    Log.d("***ClassScanViewBarcodeActivity ,onPictureTaken(): bmpOfTheImageFromCamera getByteCount(): ",
                            String.valueOf(bmpOfTheImageFromCamera.getByteCount()));



                    //convert Bitmap to BinaryBitmap 
                    bitmap = cameraBytesToBinaryBitmap(resizedBitmap);


                    if (bitmap != null) {
                        // 5) decode the VIN & set the value of GUI text component
                        String VIN = decodeBitmapToString(bitmap);
                        Log.d("***ClassScanViewBarcodeActivity ,onPictureTaken(): VIN ",
                                VIN);
                        VINtext.setText(VIN);
                        VINtext.refreshDrawableState();
                    } else {
                        Log.d("ClassScanViewBarcodeActivity ,onPictureTaken(): bitmap=",String.valueOf(bitmap));

                    }
                } else {
                    Log.d("ClassScanViewBarcodeActivity , onPictureTaken(): bmpOfTheImageFromCamera = ",
                            String.valueOf(bmpOfTheImageFromCamera));

                }


            }// end try

            catch (Exception exc) {
                exc.getMessage();

                Log.d("ClassScanViewBarcodeActivity , scanButton.setOnClickListener(): exception = ",
                        exc.getMessage());
            }

            finally
            {
                globalCamera.stopPreview();
                //start previewing again onthe SurfaceView in case use wants to take another pic/scan
                globalCamera.startPreview();
            }

        }// end onPictureTaken()
    };// jpegCallback implementation


    /*
     *  savePicture(byte [] data) for testing 
     */
    public void savePicture(byte [] data , double sizeInPercent)
    {
        Log.d( "ScanVinFromBarcodeActivity " , "savePicture(byte [] data)");
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmddhhmmss");
        String date = dateFormat.format(new Date());
        String photoFile = "Picture_sample_sizePercent_"+sizeInPercent+"_"+ date + ".jpg";

        File sdDir = Environment
                  .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);


        String filename =sdDir + File.separator + photoFile;

        File pictureFile = new File(filename);

        try {
          FileOutputStream fos = new FileOutputStream(pictureFile);
          fos.write(data);
          fos.close();

          Toast.makeText(this, "New Image saved:" + photoFile,
              Toast.LENGTH_LONG).show();

        } catch (Exception error) {
            Log.d( "File not saved: " , error.getMessage());
          Toast.makeText(this, "Image could not be saved.",
              Toast.LENGTH_LONG).show();
        }

      }

    /* find camera on device */
    private int findFrontFacingCamera() {
        int cameraId = -1;
        // Search for the front facing camera 
        int numberOfCameras = Camera.getNumberOfCameras();
        for (int i = 0; i < numberOfCameras; i++) {
            CameraInfo info = new CameraInfo();
            Camera.getCameraInfo(i, info);
            if (info.facing == CameraInfo.CAMERA_FACING_BACK) {
                Log.d("ClassScanViewBarcodeActivity , findFrontFacingCamera(): ",
                        "Camera found");
                cameraId = i;
                break;
            }
        }
        return cameraId;
    }// end findFrontFacingCamera()


    /*
     * Attempts to decode barcode data inside the input bitmap.
     * Uses zxing API hints such as DecodeHintType.TRY_HARDER ,DecodeHintType.PURE_BARCODE. 
     */
    @SuppressWarnings("finally")
    public String decodeBitmapToString(BinaryBitmap bitmap) {


        Log.d("ClassScanViewBarcodeActivity",
                "decodeBitmapToString(BinaryBitmap bitmap");
        Reader reader = null;
        Result result = null;
        String textResult = null;
        try {

            Hashtable<DecodeHintType, Object> decodeHints = new Hashtable<DecodeHintType, Object>();
            decodeHints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
            decodeHints.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);



            reader = new MultiFormatReader();
            if (bitmap != null) {
                result = reader.decode(bitmap,  decodeHints);
                if (result != null) {
                    Log.d("decodeBitmapToString (BinaryBitmap bitmap): result = ",
                            String.valueOf(result));


                    Log.d("decodeBitmapToString (BinaryBitmap bitmap): result = ",
                            String.valueOf(result.getBarcodeFormat().toString()));

                    textResult = result.getText();


                } else {
                    Log.d("decodeBitmapToString (BinaryBitmap bitmap): result = ",
                            String.valueOf(result));
                }
            } else {
                Log.d("decodeBitmapToString (BinaryBitmap bitmap): bitmap = ",
                        String.valueOf(bitmap));
            }


        } catch (NotFoundException e) {
            // TODO Auto-generated catch block

            textResult = "Unable to decode. Please try again.";
            e.printStackTrace();



        } catch (ChecksumException e) {

            textResult = "Unable to decode. Please try again.";
            e.printStackTrace();



        } catch (FormatException e) {

            textResult = "Unable to decode. Please try again.";
            e.printStackTrace();

        }

        finally
        {

        return textResult;
        }
    }// end decodeBitmapToString ()
    @SuppressWarnings("finally")
    public BinaryBitmap cameraBytesToBinaryBitmap(Bitmap bitmap) {
        Log.d("ClassScanViewBarcodeActivity , cameraBytesToBinaryBitmap (Bitmap bitmap):" , "");
        BinaryBitmap binaryBitmap = null;
        try
        {

        if (bitmap != null) {

            int[] pixels = new int[bitmap.getHeight() * bitmap.getWidth()];

            bitmap.getPixels(pixels, 0,  bitmap.getWidth(),0, 0,bitmap.getWidth(), bitmap.getHeight());

            RGBLuminanceSource source = new RGBLuminanceSource(
                    bitmap.getWidth(), bitmap.getHeight(), pixels);

            HybridBinarizer bh = new HybridBinarizer(source);
            binaryBitmap = new BinaryBitmap(bh);
        } else {
            Log.d("ClassScanViewBarcodeActivity , cameraBytesToBinaryBitmap (Bitmap bitmap): bitmap = ",
                    String.valueOf(bitmap));
        }
        }
        catch (Exception exc)
        {
            exc.printStackTrace();
        }
        finally
        {

        return binaryBitmap;
        }
    }

    @SuppressLint("NewApi")
    @SuppressWarnings("deprecation")
    /*
     * The method getScreenOrientation() return screen orientation either
     * landscape or portrait. IF width < height , than orientation = portrait,
     * ELSE landscape For backwards compatibility we use to methods to detect
     * the orientation. The first method is for API versions prior to 13 or
     * HONEYCOMB.
     */
    public int getScreenOrientation() {

        int currentapiVersion = android.os.Build.VERSION.SDK_INT;
        // if API version less than 13
        Display getOrient = getWindowManager().getDefaultDisplay();
        int orientation = Configuration.ORIENTATION_UNDEFINED;

        if (currentapiVersion < android.os.Build.VERSION_CODES.HONEYCOMB) {
            // Do something for API version less than HONEYCOMB

            if (getOrient.getWidth() == getOrient.getHeight()) {
                orientation = Configuration.ORIENTATION_SQUARE;
            } else {
                if (getOrient.getWidth() < getOrient.getHeight()) {
                    orientation = Configuration.ORIENTATION_PORTRAIT;
                } else {
                    orientation = Configuration.ORIENTATION_LANDSCAPE;
                }
            }
        } else {
            // Do something for API version greater or equal to HONEYCOMB

            Point size = new Point();
            this.getWindowManager().getDefaultDisplay().getSize(size);
            int width = size.x;
            int height = size.y;

            if (width < height) {
                orientation = Configuration.ORIENTATION_PORTRAIT;
            } else {
                orientation = Configuration.ORIENTATION_LANDSCAPE;
            }
        }

        return orientation;

    }// end getScreenOrientation()
}// end class ScanVinFromBarcodeActivity

CameraPreview.java ，用于预览来自相机的实时图像

package com.ty.tyownerspoc.barcode;
import java.io.IOException;
import java.util.List;
import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.Size;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;


/** A basic Camera preview class */
public class CameraPreview extends SurfaceView implements
        SurfaceHolder.Callback {
    private SurfaceHolder mHolder;
    private Camera mCamera;
    private Context context;

    public CameraPreview(Context context, Camera camera) {
        super(context);
        mCamera = camera;
        this.context = context;

        // Install a SurfaceHolder.Callback so we get notified when the
        // underlying surface is created and destroyed.
        mHolder = getHolder();
        mHolder.addCallback(this);
        // deprecated setting, but required on Android versions prior to 3.0
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    public void surfaceCreated(SurfaceHolder holder) {
        // The Surface has been created, now tell the camera where to draw the
        // preview.
        try {
            mCamera.setPreviewDisplay(holder);
            mCamera.startPreview();
        } catch (IOException e) {

        }
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
                }

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
        // If your preview can change or rotate, take care of those events here.
        // Make sure to stop the preview before resizing or reformatting it.

        if (mHolder.getSurface() == null) {
            // preview surface does not exist
            return;
        }

        // stop preview before making changes
        try {
            mCamera.stopPreview();
        } catch (Exception e) {
                        }
                Camera.Parameters p = mCamera.getParameters();

        // get width & height of the SurfaceView
        int SurfaceViewWidth = this.getWidth();
        int SurfaceViewHeight = this.getHeight();

        List<Size> sizes = p.getSupportedPreviewSizes();
         Size optimalSize = getOptimalPreviewSize(sizes, SurfaceViewWidth, SurfaceViewHeight);


        // set parameters
        p.setPreviewSize(optimalSize.width, optimalSize.height);

        /*rotate the image by 90 degrees clockwise , in order to correctly displayed*/ 

mCamera.setDisplayOrientation(90); mCamera.setParameters(p);

        // start preview with new settings
        try {
            mCamera.setPreviewDisplay(mHolder);
            mCamera.startPreview();

        } catch (Exception e) {
            Log.d("CameraPreview ,  surfaceCreated() , orientation: ",
                    String.valueOf(e.getMessage()));
        }
    }// end surfaceChanged()
     static Size getOptimalPreviewSize(List <Camera.Size>sizes, int w, int h) {
            final double ASPECT_TOLERANCE = 0.1;
            final double MAX_DOWNSIZE = 1.5;

            double targetRatio = (double) w / h;
            if (sizes == null) return null;

            Size optimalSize = null;
            double minDiff = Double.MAX_VALUE;

            int targetHeight = h;

            // Try to find an size match aspect ratio and size
            for (Camera.Size size : sizes) {
              double ratio = (double) size.width / size.height;
              double downsize = (double) size.width / w;
              if (downsize > MAX_DOWNSIZE) {
                //if the preview is a lot larger than our display surface ignore it
                //reason - on some phones there is not enough heap available to show the larger preview sizes
                continue;
              }
              if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
              if (Math.abs(size.height - targetHeight) < minDiff) {
                optimalSize = size;
                minDiff = Math.abs(size.height - targetHeight);
              }
            }
            // Cannot find the one match the aspect ratio, ignore the requirement
            //keep the max_downsize requirement
            if (optimalSize == null) {
              minDiff = Double.MAX_VALUE;
              for (Size size : sizes) {
                double downsize = (double) size.width / w;
                if (downsize > MAX_DOWNSIZE) {
                  continue;
                }
                if (Math.abs(size.height - targetHeight) < minDiff) {
                  optimalSize = size;
                  minDiff = Math.abs(size.height - targetHeight);
                }
              }
            }
            //everything else failed, just take the closest match
            if (optimalSize == null) {
              minDiff = Double.MAX_VALUE;
              for (Size size : sizes) {
                if (Math.abs(size.height - targetHeight) < minDiff) {
                  optimalSize = size;
                  minDiff = Math.abs(size.height - targetHeight);
                }
              }
            }
            return optimalSize;
          }

}//end CameraPreview class

activity_barcode_vin_scanner.xml，ScanVinFromBarcodeActivity 的布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:padding="20dip" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:padding="20dip"
        android:text="@string/decode_label"
        android:textColor="@color/mbackground1" />

    <TextView
        android:id="@+id/mytext"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@color/mbackground2"
        android:gravity="center_horizontal"
        android:padding="20dip"
        android:textColor="@color/mytextcolor" />

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:padding="20dip"
        android:text="@string/continue_label"
        android:textColor="@color/mytextcolor" />

    <Button
        android:id="@+id/webbutton"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/web_button"
        android:textColor="@color/mytextcolor" />

    <FrameLayout
    android:id="@+id/FrameLayoutForPreview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_weight="1">

        <SurfaceView
            android:id="@+id/surfaceViewBarcodeScanner"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

    </FrameLayout>
</LinearLayout>

我编辑了我的 decodeBitmapToString(BinaryBitmap bitmap) 添加了“DecodeHintTypes”，例如“更加努力”和“纯单色”，以提供纯黑白图像。还有其他提示我应该用来扫描线性条形码(特别是车辆 VIN 条形码)，我仍然收到 NotFoundException 吗？

我编辑的 decodeBitmapToString(BinaryBitmap bitmap) 方法:

    @SuppressWarnings("finally")
    public String decodeBitmapToString(BinaryBitmap bitmap) {

        Reader reader = null;
        Result result = null;
        String textResult = null;
        try {

            Hashtable<DecodeHintType, Object> decodeHints = new Hashtable<DecodeHintType, Object>();
            decodeHints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
            decodeHints.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);

            reader = new MultiFormatReader();
            if (bitmap != null) {
                result = reader.decode(bitmap,  decodeHints);
                if (result != null) {
                    Log.d("decodeBitmapToString (BinaryBitmap bitmap): result = ",
                            String.valueOf(result));


                    Log.d("decodeBitmapToString (BinaryBitmap bitmap): result = ",
                            String.valueOf(result.getBarcodeFormat().toString()));

                    textResult = result.getText();


                } else {
                    Log.d("decodeBitmapToString (BinaryBitmap bitmap): result = ",
                            String.valueOf(result));
                }
            } else {
                Log.d("decodeBitmapToString (BinaryBitmap bitmap): bitmap = ",
                        String.valueOf(bitmap));
            }

        } catch (NotFoundException e) {
            // TODO Auto-generated catch block

            textResult = "Unable to decode. Please try again.";
            e.printStackTrace();


        } catch (ChecksumException e) {

            textResult = "Unable to decode. Please try again.";
            e.printStackTrace();



        } catch (FormatException e) {

            textResult = "Unable to decode. Please try again.";
            e.printStackTrace();
                        }

        finally
        {
        return textResult;
        }
    }// end 

测试我正在使用的条形码:

我的日志:

任何帮助将不胜感激。

谢谢。

Answer 1

NotFoundException 表示一帧 不包含条形码。这是正常的。您需要处理这个问题，不要让异常从您的应用程序中传播出来。继续下一帧；你每秒得到几十个。