Alternativa a la biblioteca zxing QR reader para Java / Android? [cerrado]

No hay necesidad de instalar zxing para implementar qr reader, Solo cree una clase IntentIntegrator.java e IntentResult.java archiva y llama desde tu actividad.

Aquí está el código fuente para esto....

Compruebe el código fuente completo aquí

import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.ActivityNotFoundException;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.net.Uri;
import android.util.Log;


public final class IntentIntegrator {

  public static final int REQUEST_CODE = 0x0000c0de; // Only use bottom 16 bits
  private static final String TAG = IntentIntegrator.class.getSimpleName();

  public static final String DEFAULT_TITLE = "Install Barcode Scanner?";
  public static final String DEFAULT_MESSAGE =
      "This application requires Barcode Scanner. Would you like to install it?";
  public static final String DEFAULT_YES = "Yes";
  public static final String DEFAULT_NO = "No";

  private static final String BS_PACKAGE = "com.google.zxing.client.android";

  // supported barcode formats
  public static final Collection<String> PRODUCT_CODE_TYPES = list("UPC_A", "UPC_E", "EAN_8", "EAN_13", "RSS_14");
  public static final Collection<String> ONE_D_CODE_TYPES =
      list("UPC_A", "UPC_E", "EAN_8", "EAN_13", "CODE_39", "CODE_93", "CODE_128",
           "ITF", "RSS_14", "RSS_EXPANDED");
  public static final Collection<String> QR_CODE_TYPES = Collections.singleton("QR_CODE");
  public static final Collection<String> DATA_MATRIX_TYPES = Collections.singleton("DATA_MATRIX");

  public static final Collection<String> ALL_CODE_TYPES = null;

  public static final Collection<String> TARGET_BARCODE_SCANNER_ONLY = Collections.singleton(BS_PACKAGE);
  public static final Collection<String> TARGET_ALL_KNOWN = list(
          BS_PACKAGE, // Barcode Scanner
          "com.srowen.bs.android", // Barcode Scanner+
          "com.srowen.bs.android.simple" // Barcode Scanner+ Simple
          // TODO add more -- what else supports this intent?
      );

  private final Activity activity;
  private String title;
  private String message;
  private String buttonYes;
  private String buttonNo;
  private Collection<String> targetApplications;

  public IntentIntegrator(Activity activity) {
    this.activity = activity;
    title = DEFAULT_TITLE;
    message = DEFAULT_MESSAGE;
    buttonYes = DEFAULT_YES;
    buttonNo = DEFAULT_NO;
    targetApplications = TARGET_ALL_KNOWN;
  }

  public String getTitle() {
    return title;
  }

  public void setTitle(String title) {
    this.title = title;
  }

  public void setTitleByID(int titleID) {
    title = activity.getString(titleID);
  }

  public String getMessage() {
    return message;
  }

  public void setMessage(String message) {
    this.message = message;
  }

  public void setMessageByID(int messageID) {
    message = activity.getString(messageID);
  }

  public String getButtonYes() {
    return buttonYes;
  }

  public void setButtonYes(String buttonYes) {
    this.buttonYes = buttonYes;
  }

  public void setButtonYesByID(int buttonYesID) {
    buttonYes = activity.getString(buttonYesID);
  }

  public String getButtonNo() {
    return buttonNo;
  }

  public void setButtonNo(String buttonNo) {
    this.buttonNo = buttonNo;
  }

  public void setButtonNoByID(int buttonNoID) {
    buttonNo = activity.getString(buttonNoID);
  }

  public Collection<String> getTargetApplications() {
    return targetApplications;
  }

  public void setTargetApplications(Collection<String> targetApplications) {
    this.targetApplications = targetApplications;
  }

  public void setSingleTargetApplication(String targetApplication) {
    this.targetApplications = Collections.singleton(targetApplication);
  }

  /**
   * Initiates a scan for all known barcode types.
   */
  public AlertDialog initiateScan() {
    return initiateScan(ALL_CODE_TYPES);
  }

  /**
   * Initiates a scan only for a certain set of barcode types, given as strings corresponding
   * to their names in ZXing's {@code BarcodeFormat} class like "UPC_A". You can supply constants
   * like {@link #PRODUCT_CODE_TYPES} for example.
   */
  public AlertDialog initiateScan(Collection<String> desiredBarcodeFormats) {
    Intent intentScan = new Intent(BS_PACKAGE + ".SCAN");
    intentScan.addCategory(Intent.CATEGORY_DEFAULT);

    // check which types of codes to scan for
    if (desiredBarcodeFormats != null) {
      // set the desired barcode types
      StringBuilder joinedByComma = new StringBuilder();
      for (String format : desiredBarcodeFormats) {
        if (joinedByComma.length() > 0) {
          joinedByComma.append(',');
        }
        joinedByComma.append(format);
      }
      intentScan.putExtra("SCAN_FORMATS", joinedByComma.toString());
    }

    String targetAppPackage = findTargetAppPackage(intentScan);
    if (targetAppPackage == null) {
      return showDownloadDialog();
    }
    intentScan.setPackage(targetAppPackage);
    intentScan.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    intentScan.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
    activity.startActivityForResult(intentScan, REQUEST_CODE);
    return null;
  }

  private String findTargetAppPackage(Intent intent) {
    PackageManager pm = activity.getPackageManager();
    List<ResolveInfo> availableApps = pm.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);
    if (availableApps != null) {
      for (ResolveInfo availableApp : availableApps) {
        String packageName = availableApp.activityInfo.packageName;
        if (targetApplications.contains(packageName)) {
          return packageName;
        }
      }
    }
    return null;
  }

  private AlertDialog showDownloadDialog() {
    AlertDialog.Builder downloadDialog = new AlertDialog.Builder(activity);
    downloadDialog.setTitle(title);
    downloadDialog.setMessage(message);
    downloadDialog.setPositiveButton(buttonYes, new DialogInterface.OnClickListener() {
      @Override
      public void onClick(DialogInterface dialogInterface, int i) {
        Uri uri = Uri.parse("market://details?id=" + BS_PACKAGE);
        Intent intent = new Intent(Intent.ACTION_VIEW, uri);
        try {
          activity.startActivity(intent);
        } catch (ActivityNotFoundException anfe) {
          // Hmm, market is not installed
          Log.w(TAG, "Android Market is not installed; cannot install Barcode Scanner");
        }
      }
    });
    downloadDialog.setNegativeButton(buttonNo, new DialogInterface.OnClickListener() {
      @Override
      public void onClick(DialogInterface dialogInterface, int i) {}
    });
    return downloadDialog.show();
  }


  /**
   * <p>Call this from your {@link Activity}'s
   * {@link Activity#onActivityResult(int, int, Intent)} method.</p>
   *
   * @return null if the event handled here was not related to this class, or
   *  else an {@link IntentResult} containing the result of the scan. If the user cancelled scanning,
   *  the fields will be null.
   */
  public static IntentResult parseActivityResult(int requestCode, int resultCode, Intent intent) {
    if (requestCode == REQUEST_CODE) {
      if (resultCode == Activity.RESULT_OK) {
        String contents = intent.getStringExtra("SCAN_RESULT");
        String formatName = intent.getStringExtra("SCAN_RESULT_FORMAT");
        byte[] rawBytes = intent.getByteArrayExtra("SCAN_RESULT_BYTES");
        int intentOrientation = intent.getIntExtra("SCAN_RESULT_ORIENTATION", Integer.MIN_VALUE);
        Integer orientation = intentOrientation == Integer.MIN_VALUE ? null : intentOrientation;
        String errorCorrectionLevel = intent.getStringExtra("SCAN_RESULT_ERROR_CORRECTION_LEVEL");
        return new IntentResult(contents,
                                formatName,
                                rawBytes,
                                orientation,
                                errorCorrectionLevel);
      }
      return new IntentResult();
    }
    return null;
  }


  /**
   * Shares the given text by encoding it as a barcode, such that another user can
   * scan the text off the screen of the device.
   *
   * @param text the text string to encode as a barcode
   */
  public void shareText(CharSequence text) {
    Intent intent = new Intent();
    intent.addCategory(Intent.CATEGORY_DEFAULT);
    intent.setAction(BS_PACKAGE + ".ENCODE");
    intent.putExtra("ENCODE_TYPE", "TEXT_TYPE");
    intent.putExtra("ENCODE_DATA", text);
    String targetAppPackage = findTargetAppPackage(intent);
    if (targetAppPackage == null) {
      showDownloadDialog();
    } else {
      intent.setPackage(targetAppPackage);
      intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
      intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
      activity.startActivity(intent);
    }
  }

  private static Collection<String> list(String... values) {
    return Collections.unmodifiableCollection(Arrays.asList(values));
  }

}

E IntentResult.java para cantaining la información del código de barras seleccionado o código qr.

/** * */

public final class IntentResult {

      private final String contents;
      private final String formatName;
      private final byte[] rawBytes;
      private final Integer orientation;
      private final String errorCorrectionLevel;

      IntentResult() {
        this(null, null, null, null, null);
      }

      IntentResult(String contents,
                   String formatName,
                   byte[] rawBytes,
                   Integer orientation,
                   String errorCorrectionLevel) {
        this.contents = contents;
        this.formatName = formatName;
        this.rawBytes = rawBytes;
        this.orientation = orientation;
        this.errorCorrectionLevel = errorCorrectionLevel;
      }

      /**
       * @return raw content of barcode
       */
      public String getContents() {
        return contents;
      }

      /**
       * @return name of format, like "QR_CODE", "UPC_A". See {@code BarcodeFormat} for more format names.
       */
      public String getFormatName() {
        return formatName;
      }

      /**
       * @return raw bytes of the barcode content, if applicable, or null otherwise
       */
      public byte[] getRawBytes() {
        return rawBytes;
      }

      /**
       * @return rotation of the image, in degrees, which resulted in a successful scan. May be null.
       */
      public Integer getOrientation() {
        return orientation;
      }

      /**
       * @return name of the error correction level used in the barcode, if applicable
       */
      public String getErrorCorrectionLevel() {
        return errorCorrectionLevel;
      }

      @Override
      public String toString() {
        StringBuilder dialogText = new StringBuilder(100);
        dialogText.append("Format: ").append(formatName).append('\n');
        dialogText.append("Contents: ").append(contents).append('\n');
        int rawBytesLength = rawBytes == null ? 0 : rawBytes.length;
        dialogText.append("Raw bytes: (").append(rawBytesLength).append(" bytes)\n");
        dialogText.append("Orientation: ").append(orientation).append('\n');
        dialogText.append("EC level: ").append(errorCorrectionLevel).append('\n');
        return dialogText.toString();
      }

    }

Ahora cómo llamar a estas clases desde tu Actividad

  btnScanBarCode.setOnClickListener(new View.OnClickListener() {

                    @Override
                    public void onClick(View v) {
                        // TODO Auto-generated method stub
                    IntentIntegrator integrator = new IntentIntegrator(BarCodeReaderActivity.this);
                integrator.initiateScan();  



                    }
                });

Y in onActivityResult

 @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub

        IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
          if (scanResult != null) {

            // handle scan result
             contantsString =  scanResult.getContents()==null?"0":scanResult.getContents();
             if (contantsString.equalsIgnoreCase("0")) {
                 Toast.makeText(this, "Problem to get the  contant Number", Toast.LENGTH_LONG).show();

             }else {
                 Toast.makeText(this, contantsString, Toast.LENGTH_LONG).show();

            }

          }
          else{
              Toast.makeText(this, "Problem to secan the barcode.", Toast.LENGTH_LONG).show();
          }
    }

Tengo el mismo problema. Descargué la biblioteca ZXing y la integré en mi proyecto. La integración es muy difícil y junky y paso mucho tiempo para limpiar el proyecto y utilizar solo la parte QRCode. Ahora funciona, pero hay un problema conocido con algunos dispositivos Motorola Atrix y DroidX (Android 2.3)donde CaptureActivity muestra una pantalla blanca en lugar de la cámara. Este es un problema con la biblioteca, pero los chicos de ZXing no solucionarlo. Parece que este problema también está presente en Htc Nexus Uno. Este es un post: https://groups.google.com/forum/#! topic / zxing / BofniyFVZaQ .

@ Sean