Android Open Source - voc Decode Handler

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Copyright (C) 2010 ZXing authors/*  ww w  .ja v  a  2 s. c  o m*/
 *
 * 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
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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 transmission.thirdlib.capture;

import java.util.Map;
import net.bluetoothviewer.R;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.Log;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.ReaderException;
import com.google.zxing.Result;
import com.google.zxing.common.HybridBinarizer;
import transmission.thirdlib.capture.CaptureActivity;

final class DecodeHandler extends Handler {

  private static final String TAG = DecodeHandler.class.getSimpleName();

  private final CaptureActivity activity;
  private final MultiFormatReader multiFormatReader;
  private boolean running = true;

  DecodeHandler(CaptureActivity activity, Map<DecodeHintType, Object> hints) {
    multiFormatReader = new MultiFormatReader();
    multiFormatReader.setHints(hints);
    this.activity = activity;
  }

  @Override
  public void handleMessage(Message message) {
    if (!running) {
      return;
    }
    switch (message.what) {
    case R.id.decode:
      decode((byte[]) message.obj, message.arg1, message.arg2);
      break;
    case R.id.quit:
      running = false;
      Looper.myLooper().quit();
      break;
    }
  }

  /**
   * Decode the data within the viewfinder rectangle, and time how long it
   * took. For efficiency, reuse the same reader objects from one decode to
   * the next.
   * 
   * @param data
   *            The YUV preview frame.
   * @param width
   *            The width of the preview frame.
   * @param height
   *            The height of the preview frame.
   */
  private void decode(byte[] data, int width, int height) {
    long start = System.currentTimeMillis();
    Result rawResult = null;
    PlanarYUVLuminanceSource source = activity.getCameraManager()
        .buildLuminanceSource(data, width, height);
    if (source != null) {
      BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
      try {
        rawResult = multiFormatReader.decodeWithState(bitmap);
      }
      catch (ReaderException re) {
        // continue
      }
      finally {
        multiFormatReader.reset();
      }
    }

    Handler handler = activity.getHandler();
    if (rawResult != null) {
      // Don't log the barcode contents for security.
      long end = System.currentTimeMillis();
      Log.d(TAG, "Found barcode in " + (end - start) + " ms");
      if (handler != null) {
        Message message = Message.obtain(handler,
            R.id.decode_succeeded, rawResult);
        Bundle bundle = new Bundle();
        bundle.putParcelable(DecodeThread.BARCODE_BITMAP,
            source.renderCroppedGreyscaleBitmap());
        message.setData(bundle);
        message.sendToTarget();
      }
    }
    else {
      if (handler != null) {
        Message message = Message.obtain(handler, R.id.decode_failed);
        message.sendToTarget();
      }
    }
  }

}

Java Source Code List

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