Android Open Source - ivotingverification Capture Activity Handler

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * Copyright (C) 2013 Eesti Vabariigi Valimiskomisjon 
 * (Estonian National Electoral Committee), www.vvk.ee
 *//from w  ww.  j av a 2  s.  co m
 * Written in 2013 by AS Finestmedia, www.finestmedia.ee
 *
 * Vote-verification application for Estonian Internet voting system
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * This file incorporates work covered by the following copyright and  
 * permission notice:  
 * 
 * Copyright (C) 2008 ZXing authors
 * 
 * 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 ee.vvk.ivotingverification.qr;

import java.util.Collection;

import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;

import ee.vvk.ivotingverification.QRScannerActivity;
import ee.vvk.ivotingverification.R;
import ee.vvk.ivotingverification.util.Util;

/**
 * This class handles all the messaging which comprises the state machine for
 * capture.
 * 
 * @author dswitkin@google.com (Daniel Switkin)
 */
public final class CaptureActivityHandler extends Handler {

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

  private final QRScannerActivity activity;
  private final DecodeThread decodeThread;
  private State state;
  private final CameraManager cameraManager;

  private enum State {
    PREVIEW, SUCCESS, DONE
  }

  public CaptureActivityHandler(QRScannerActivity activity,
      Collection<BarcodeFormat> decodeFormats, String characterSet,
      CameraManager cameraManager) {
    this.activity = activity;
    decodeThread = new DecodeThread(activity, decodeFormats, characterSet,
        new ViewfinderResultPointCallback(activity.getViewfinderView()));
    decodeThread.start();
    state = State.SUCCESS;

    this.cameraManager = cameraManager;
    cameraManager.startPreview();
    restartPreviewAndDecode();
  }

  @Override
  public void handleMessage(Message message) {

    if (message.what == R.id.auto_focus) {
      if (state == State.PREVIEW) {
        cameraManager.requestAutoFocus(this, R.id.auto_focus);
      }
    } else if (message.what == R.id.restart_preview) {
      if (Util.DEBUGGABLE) {
        Log.d(TAG, "Got restart preview message");
      }
      restartPreviewAndDecode();
    } else if (message.what == R.id.decode_succeeded) {
      if (Util.DEBUGGABLE) {
        Log.d(TAG, "Got decode succeeded message");
      }
      state = State.SUCCESS;
      Bundle bundle = message.getData();
      Bitmap barcode = bundle == null ? null : (Bitmap) bundle
          .getParcelable(DecodeThread.BARCODE_BITMAP);
      activity.handleDecode((Result) message.obj, barcode);
    } else if (message.what == R.id.decode_failed) {
      state = State.PREVIEW;
      cameraManager.requestPreviewFrame(decodeThread.getHandler(),
          R.id.decode);
    } else if (message.what == R.id.return_scan_result) {
      if (Util.DEBUGGABLE) {
        Log.d(TAG, "Got return scan result message");
      }
    }
  }

  public void quitSynchronously() {
    state = State.DONE;
    cameraManager.stopPreview();
    Message quit = Message.obtain(decodeThread.getHandler(), R.id.quit);
    quit.sendToTarget();
    try {
      decodeThread.join(500L);
    } catch (InterruptedException e) {
    }

    removeMessages(R.id.decode_succeeded);
    removeMessages(R.id.decode_failed);
  }

  private void restartPreviewAndDecode() {
    if (state == State.SUCCESS) {
      state = State.PREVIEW;
      cameraManager.requestPreviewFrame(decodeThread.getHandler(),
          R.id.decode);
      cameraManager.requestAutoFocus(this, R.id.auto_focus);
      activity.drawViewfinder();
    }
  }
}

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