Android Open Source - camp-food-manager Capture Activity Handler

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Back to project page camp-food-manager.

License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Copyright (C) 2008 ZXing authors/*from  w ww. j  a va2  s . com*/
 *
 * 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.google.zxing.client.android;

import java.util.Collection;
import java.util.Map;

import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.provider.Browser;
import android.util.Log;

import com.V4Creations.FSMK.campfoodmanager.R;
import com.V4Creations.FSMK.campfoodmanager.ui.CampFoodManagerMainActivity;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.DecodeHintType;
import com.google.zxing.Result;
import com.google.zxing.client.android.camera.CameraManager;

/**
 * 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 CampFoodManagerMainActivity activity;
  private final DecodeThread decodeThread;
  private State state;
  private final CameraManager cameraManager;

  private enum State {
    PREVIEW, SUCCESS, DONE
  }

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

    // Start ourselves capturing previews and decoding.
    this.cameraManager = cameraManager;
    cameraManager.startPreview();
    restartPreviewAndDecode();
  }

  @Override
  public void handleMessage(Message message) {
    switch (message.what) {
    case R.id.restart_preview:
      Log.d(TAG, "Got restart preview message");
      restartPreviewAndDecode();
      break;
    case R.id.decode_succeeded:
      Log.d(TAG, "Got decode succeeded message");
      state = State.SUCCESS;
      Bundle bundle = message.getData();
      Bitmap barcode = null;
      float scaleFactor = 1.0f;
      if (bundle != null) {
        byte[] compressedBitmap = bundle
            .getByteArray(DecodeThread.BARCODE_BITMAP);
        if (compressedBitmap != null) {
          barcode = BitmapFactory.decodeByteArray(compressedBitmap,
              0, compressedBitmap.length, null);
          // Mutable copy:
          barcode = barcode.copy(Bitmap.Config.ARGB_8888, true);
        }
        scaleFactor = bundle
            .getFloat(DecodeThread.BARCODE_SCALED_FACTOR);
      }
      activity.handleDecode((Result) message.obj, barcode, scaleFactor);
      break;
    case R.id.decode_failed:
      // We're decoding as fast as possible, so when one decode fails,
      // start another.
      state = State.PREVIEW;
      cameraManager.requestPreviewFrame(decodeThread.getHandler(),
          R.id.decode);
      break;
    case R.id.return_scan_result:
      Log.d(TAG, "Got return scan result message");
      activity.setResult(Activity.RESULT_OK, (Intent) message.obj);
      activity.finish();
      break;
    case R.id.launch_product_query:
      Log.d(TAG, "Got product query message");
      String url = (String) message.obj;

      Intent intent = new Intent(Intent.ACTION_VIEW);
      intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
      intent.setData(Uri.parse(url));

      ResolveInfo resolveInfo = activity.getPackageManager()
          .resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY);
      String browserPackageName = null;
      if (resolveInfo.activityInfo != null) {
        browserPackageName = resolveInfo.activityInfo.packageName;
        Log.d(TAG, "Using browser in package " + browserPackageName);
      }

      // Needed for default Android browser / Chrome only apparently
      if ("com.android.browser".equals(browserPackageName)
          || "com.android.chrome".equals(browserPackageName)) {
        intent.setPackage(browserPackageName);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.putExtra(Browser.EXTRA_APPLICATION_ID,
            browserPackageName);
      }

      try {
        activity.startActivity(intent);
      } catch (ActivityNotFoundException ignored) {
        Log.w(TAG, "Can't find anything to handle VIEW of URI " + url);
      }
      break;
    }
  }

  public void quitSynchronously() {
    state = State.DONE;
    cameraManager.stopPreview();
    Message quit = Message.obtain(decodeThread.getHandler(), R.id.quit);
    quit.sendToTarget();
    try {
      // Wait at most half a second; should be enough time, and onPause()
      // will timeout quickly
      decodeThread.join(500L);
    } catch (InterruptedException e) {
      // continue
    }

    // Be absolutely sure we don't send any queued up messages
    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);
      activity.drawViewfinder();
    }
  }

}

Java Source Code List

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