/*
* 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.client.android;
import android.content.ActivityNotFoundException;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.provider.Browser;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;
import com.google.zxing.client.android.camera.CameraManager;
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 java.util.Collection;
/**
* 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 AppInvCaptureActivity activity;
private final DecodeThread decodeThread;
private State state;
private final CameraManager cameraManager;
private enum State {
PREVIEW,
SUCCESS,
DONE
}
CaptureActivityHandler(AppInvCaptureActivity 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;
// Start ourselves capturing previews and decoding.
this.cameraManager = cameraManager;
cameraManager.startPreview();
restartPreviewAndDecode();
}
@Override
public void handleMessage(Message message) {
switch (message.what) {
case Constants.restart_preview:
Log.d(TAG, "Got restart preview message");
restartPreviewAndDecode();
break;
case Constants.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);
activity.handleDecode((Result) message.obj, barcode);
break;
case Constants.decode_failed:
// We're decoding as fast as possible, so when one decode fails, start another.
state = State.PREVIEW;
cameraManager.requestPreviewFrame(decodeThread.getHandler(), Constants.decode);
break;
case Constants.return_scan_result:
Log.d(TAG, "Got return scan result message");
activity.setResult(Activity.RESULT_OK, (Intent) message.obj);
activity.finish();
}
}
public void quitSynchronously() {
state = State.DONE;
cameraManager.stopPreview();
Message quit = Message.obtain(decodeThread.getHandler(), Constants.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(Constants.decode_succeeded);
removeMessages(Constants.decode_failed);
}
private void restartPreviewAndDecode() {
if (state == State.SUCCESS) {
state = State.PREVIEW;
cameraManager.requestPreviewFrame(decodeThread.getHandler(), Constants.decode);
activity.drawViewfinder();
}
}
}