Re: [androidbrasil-dev] integração com Barcode Scanner

On Tuesday, June 18, 2013 1:42:44 PM UTC-3, Mstrey wrote:

pergunta:

porque precisa ser na camera frontal?

O meu tablet; o nexus 7 só possui camera frontal.

Nelson

 

a qualidade das cameras frontais é MUITO baixa e vai ser MUITO dificil de fazer a leitura dos códigos de barras. Quando precisei fazer um leitor de código de barras eu acbaei bloqueando aparelhos com baixa resolução de câmera pois eles não conseguiam fazer a leitura.

pense nisso! qual a real necessidade da leitura ser feita pela câmera frontal?

Maicon Strey
Novo Hamburgo - RS - Brasil
------------------

http://about.me/mstrey

------------------

Linux user: #525086

On Wed, Jun 12, 2013 at 10:32 AM, marone menezes silva <maro...@gmail.com> wrote:

Boa tarde senhores!

Sou novo na progração android.

Preciso fazer um apk que realize leitura de código de barra.

Conseguir fazer um apk fazendo integração com apk Barconde Scanner, porém ele por padrão habilita a câmera de traz do Smartphone, e gostaria de habilitasse a câmera frontal. Alguém pode me ajudar?
Segue o código fonte:

public class CodigoBarra extends Activity {


        @Override
        protected void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);

                setContentView(R.layout.activity_codigo_barra);

        }



        public void lerCodigoBarra(View v){

                IntentIntegrator integrator = new IntentIntegrator(this);
        integrator.initiateScan();

        }

        public void onActivityResult(int requestCode, int resultCode, Intent intent) {
                  IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
                  if (scanResult != null) {

                          String barcode;
                          String typ;
                          String[] nome;
                          barcode = scanResult.getContents();
                          typ = scanResult.getFormatName();

                          Toast.makeText(getApplicationContext(), ""+barcode, Toast.LENGTH_LONG).show();

                  }
           }

}

IntentResult.java
package codigobarra;

/**
 * <p>Encapsulates the result of a barcode scan invoked through {@link IntentIntegrator}.</p>
 *
 * @author Sean Owen
 */
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();
  }

}

IntentIntegrator.java
package codigobarra;

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

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.os.Bundle;
import android.util.Log;

/**
 * <p>A utility class which helps ease integration with Barcode Scanner via {@link Intent}s. This is a simple
 * way to invoke barcode scanning and receive the result, without any need to integrate, modify, or learn the
 * project's source code.</p>
 *
 * <h2>Initiating a barcode scan</h2>
 *
 * <p>To integrate, create an instance of {@code IntentIntegrator} and call {@link #initiateScan()} and wait
 * for the result in your app.</p>
 *
 * <p>It does require that the Barcode Scanner (or work-alike) application is installed. The
 * {@link #initiateScan()} method will prompt the user to download the application, if needed.</p>
 *
 * <p>There are a few steps to using this integration. First, your {@link Activity} must implement
 * the method {@link Activity#onActivityResult(int, int, Intent)} and include a line of code like this:</p>
 *
 * <pre>{@code
 * public void onActivityResult(int requestCode, int resultCode, Intent intent) {
 *   IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
 *   if (scanResult != null) {
 *     // handle scan result
 *   }
 *   // else continue with any other code you need in the method
 *   ...
 * }
 * }</pre>
 *
 * <p>This is where you will handle a scan result.</p>
 *
 * <p>Second, just call this in response to a user action somewhere to begin the scan process:</p>
 *
 * <pre>{@code
 * IntentIntegrator integrator = new IntentIntegrator(yourActivity);
 * integrator.initiateScan();
 * }</pre>
 *
 * <p>Note that {@link #initiateScan()} returns an {@link AlertDialog} which is non-null if the
 * user was prompted to download the application. This lets the calling app potentially manage the dialog.
 * In particular, ideally, the app dismisses the dialog if it's still active in its {@link Activity#onPause()}
 * method.</p>
 *
 * <p>You can use {@link #setTitle(String)} to customize the title of this download prompt dialog (or, use
 * {@link #setTitleByID(int)} to set the title by string resource ID.) Likewise, the prompt message, and
 * yes/no button labels can be changed.</p>
 *
 * <p>Finally, you can use {@link #addExtra(String, Object)} to add more parameters to the Intent used
 * to invoke the scanner. This can be used to set additional options not directly exposed by this
 * simplified API.</p>
 *
 * <p>By default, this will only allow applications that are known to respond to this intent correctly
 * do so. The apps that are allowed to response can be set with {@link #setTargetApplications(Collection)}.
 * For example, set to {@link #TARGET_BARCODE_SCANNER_ONLY} to only target the Barcode Scanner app itself.</p>
 *
 * <h2>Sharing text via barcode</h2>
 *
 * <p>To share text, encoded as a QR Code on-screen, similarly, see {@link #shareText(CharSequence)}.</p>
 *
 * <p>Some code, particularly download integration, was contributed from the Anobiit application.</p>
 *
 * <h2>Enabling experimental barcode formats</h2>
 *
 * <p>Some formats are not enabled by default even when scanning with {@link #ALL_CODE_TYPES}, such as
 * {@link com.google.zxing.BarcodeFormat#PDF_417}. Use {@link #initiateScan(java.util.Collection)} with
 * a collection containing the names of formats to scan for explicitly, like "PDF_417", to use such
 * formats.</p>
 *
 * @author Sean Owen
 * @author Fred Lin
 * @author Isaac Potoczny-Jones
 * @author Brad Drehmer
 * @author gcstang
 */
public 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";
  private static final String BSPLUS_PACKAGE = "com.srowen.bs.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
          BSPLUS_PACKAGE, // Barcode Scanner+
          BSPLUS_PACKAGE + ".simple" // Barcode Scanner+ Simple
          // 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;
  private final Map<String,Object> moreExtras;

  public IntentIntegrator(Activity activity) {
    this.activity = activity;
    title = DEFAULT_TITLE;
    message = DEFAULT_MESSAGE;
    buttonYes = DEFAULT_YES;
    buttonNo = DEFAULT_NO;
    targetApplications = TARGET_ALL_KNOWN;
    moreExtras = new HashMap<String,Object>(3);
  }

  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);
  }

  public Map<String,?> getMoreExtras() {
    return moreExtras;
  }

  public void addExtra(String key, Object value) {
    moreExtras.put(key, value);
  }

  /**
   * 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.
   *
   * @return the {@link AlertDialog} that was shown to the user prompting them to download the app
   *   if a prompt was needed, or null otherwise
   */
  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);
    attachMoreExtras(intentScan);
    startActivityForResult(intentScan, REQUEST_CODE);
    return null;
  }

  /**
   * Start an activity.<br>
   * This method is defined to allow different methods of activity starting for
   * newer versions of Android and for compatibility library.
   *
   * @param intent Intent to start.
   * @param code Request code for the activity
   * @see android.app.Activity#startActivityForResult(Intent, int)
   * @see android.app.Fragment#startActivityForResult(Intent, int)
   */
  protected void startActivityForResult(Intent intent, int code) {
    activity.startActivityForResult(intent, code);
  }

  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() {

      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() {

      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;
  }


  /**
   * Defaults to type "TEXT_TYPE".
   * @see #shareText(CharSequence, CharSequence)
   */
  public AlertDialog shareText(CharSequence text) {
    return shareText(text, "TEXT_TYPE");
  }

  /**
   * 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
   * @param type type of data to encode. See {@code com.google.zxing.client.android.Contents.Type} constants.
   * @return the {@link AlertDialog} that was shown to the user prompting them to download the app
   *   if a prompt was needed, or null otherwise
   */
  public AlertDialog shareText(CharSequence text, CharSequence type) {
    Intent intent = new Intent();
    intent.addCategory(Intent.CATEGORY_DEFAULT);
    intent.setAction(BS_PACKAGE + ".ENCODE");
    intent.putExtra("ENCODE_TYPE", type);
    intent.putExtra("ENCODE_DATA", text);
    String targetAppPackage = findTargetAppPackage(intent);
    if (targetAppPackage == null) {
      return showDownloadDialog();
    }
    intent.setPackage(targetAppPackage);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
    attachMoreExtras(intent);
    activity.startActivity(intent);
    return null;
  }

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

  private void attachMoreExtras(Intent intent) {
    for (Map.Entry<String,Object> entry : moreExtras.entrySet()) {
      String key = entry.getKey();
      Object value = entry.getValue();
      // Kind of hacky
      if (value instanceof Integer) {
        intent.putExtra(key, (Integer) value);
      } else if (value instanceof Long) {
        intent.putExtra(key, (Long) value);
      } else if (value instanceof Boolean) {
        intent.putExtra(key, (Boolean) value);
      } else if (value instanceof Double) {
        intent.putExtra(key, (Double) value);
      } else if (value instanceof Float) {
        intent.putExtra(key, (Float) value);
      } else if (value instanceof Bundle) {
        intent.putExtra(key, (Bundle) value);
      } else {
        intent.putExtra(key, value.toString());
      }
    }
  }

}

--
You received this message because you are subscribed to the Google Groups "Android Brasil - Dev" group.

To unsubscribe from this group and stop receiving emails from it, send an email to androidbrasil-...@googlegroups.com.

For more options, visit https://groups.google.com/groups/opt_out.

--
You received this message because you are subscribed to the Google Groups "Android Brasil - Dev" group.
To unsubscribe from this group and stop receiving emails from it, send an email to androidbrasil-dev+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.