Android Open Source - GradleAndroid-App Decode Handler

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2010 ZXing authors//from  ww  w.ja  v a2 s .c  om
 *
 * 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 com.android.app.function.qrcode.decode;

import java.io.ByteArrayOutputStream;
import java.util.Map;

import android.graphics.Bitmap;
import android.graphics.Rect;
import android.hardware.Camera.Size;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;

import com.android.app.function.R;
import com.android.app.function.qrcode.activity.CaptureActivity;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.PlanarYUVLuminanceSource;
import com.google.zxing.ReaderException;
import com.google.zxing.Result;
import com.google.zxing.common.HybridBinarizer;

public class DecodeHandler extends Handler {

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

  public 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;
    }
        if (message.what == R.id.qr_decode) {
            decode((byte[]) message.obj, message.arg1, message.arg2);

        } else if (message.what == R.id.qr_quit) {
            running = false;
            Looper.myLooper().quit();

        }
  }

  /**
   * 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) {
    Size size = activity.getCameraManager().getPreviewSize();

    // ???????????data??????????????????????
    byte[] rotatedData = new byte[data.length];
    for (int y = 0; y < size.height; y++) {
      for (int x = 0; x < size.width; x++)
        rotatedData[x * size.height + size.height - y - 1] = data[x + y * size.width];
    }

    // ???????
    int tmp = size.width;
    size.width = size.height;
    size.height = tmp;

    Result rawResult = null;
    PlanarYUVLuminanceSource source = buildLuminanceSource(rotatedData, size.width, size.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.
      if (handler != null) {
        Message message = Message.obtain(handler, R.id.qr_decode_succeeded, rawResult);
        Bundle bundle = new Bundle();
        bundleThumbnail(source, bundle);
        message.setData(bundle);
        message.sendToTarget();
      }
    } else {
      if (handler != null) {
        Message message = Message.obtain(handler, R.id.qr_decode_failed);
        message.sendToTarget();
      }
    }

  }

  private static void bundleThumbnail(PlanarYUVLuminanceSource source, Bundle bundle) {
    int[] pixels = source.renderThumbnail();
    int width = source.getThumbnailWidth();
    int height = source.getThumbnailHeight();
    Bitmap bitmap = Bitmap.createBitmap(pixels, 0, width, width, height, Bitmap.Config.ARGB_8888);
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.JPEG, 50, out);
    bundle.putByteArray(DecodeThread.BARCODE_BITMAP, out.toByteArray());
  }

  /**
   * A factory method to build the appropriate LuminanceSource object based on
   * the format of the preview buffers, as described by Camera.Parameters.
   * 
   * @param data
   *            A preview frame.
   * @param width
   *            The width of the image.
   * @param height
   *            The height of the image.
   * @return A PlanarYUVLuminanceSource instance.
   */
  public PlanarYUVLuminanceSource buildLuminanceSource(byte[] data, int width, int height) {
    Rect rect = activity.getCropRect();
    if (rect == null) {
      return null;
    }
    // Go ahead and assume it's YUV rather than die.
    return new PlanarYUVLuminanceSource(data, width, height, rect.left, rect.top, rect.width(), rect.height(), false);
  }

}

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