content: /*
   * 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 com.google.zxing.decoding;
  
  import android.app.Activity;
  import android.content.Intent;
  import android.graphics.Bitmap;
  import android.net.Uri;
  import android.os.Bundle;
  import android.os.Handler;
  import android.os.Message;
  import android.util.Log;
  
  import com.dommy.qrcode.R;
  import com.google.zxing.BarcodeFormat;
  import com.google.zxing.Result;
  import com.google.zxing.activity.CaptureActivity;
  import com.google.zxing.camera.CameraManager;
  import com.google.zxing.view.ViewfinderResultPointCallback;
  
  import java.util.Vector;
  
  
  /**
   * This class handles all the messaging which comprises the state machine for capture.
   */
  public final class CaptureActivityHandler extends Handler {
  
    private static final String TAG = CaptureActivityHandler.class.getSimpleName();
  
    private final CaptureActivity activity;
    private final DecodeThread decodeThread;
    private State state;
  
    private enum State {
      PREVIEW,
      SUCCESS,
      DONE
    }
  
    public CaptureActivityHandler(CaptureActivity activity, Vector<BarcodeFormat> decodeFormats,
                                  String characterSet) {
      this.activity = activity;
      decodeThread = new DecodeThread(activity, decodeFormats, characterSet,
          new ViewfinderResultPointCallback(activity.getViewfinderView()));
      decodeThread.start();
      state = State.SUCCESS;
      // Start ourselves capturing previews and decoding.
      CameraManager.get().startPreview();
      restartPreviewAndDecode();
    }
  
    @Override
    public void handleMessage(Message message) {
      switch (message.what) {
        case R.id.auto_focus:
          //Log.d(TAG, "Got auto-focus message");
          // When one auto focus pass finishes, start another. This is the closest thing to
          // continuous AF. It does seem to hunt a bit, but I'm not sure what else to do.
          if (state == State.PREVIEW) {
            CameraManager.get().requestAutoFocus(this, R.id.auto_focus);
          }
          break;
        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 = bundle == null ? null :
              (Bitmap) bundle.getParcelable(DecodeThread.BARCODE_BITMAP);//���ñ����߳�
          
          activity.handleDecode((Result) message.obj, barcode);//���ؽ��
          /***********************************************************************/
          break;
        case R.id.decode_failed:
          // We're decoding as fast as possible, so when one decode fails, start another.
          state = State.PREVIEW;
          CameraManager.get().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, Uri.parse(url));
          intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
          activity.startActivity(intent);
          break;
      }
    }
  
    public void quitSynchronously() {
      state = State.DONE;
      CameraManager.get().stopPreview();
      Message quit = Message.obtain(decodeThread.getHandler(), R.id.quit);
      quit.sendToTarget();
      try {
        decodeThread.join();
      } 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.get().requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
        CameraManager.get().requestAutoFocus(this, R.id.auto_focus);
        activity.drawViewfinder();
      }
    }
  
  }
  