/*
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* Copyright (C) 2008 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.zxing.scanner;
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import android.graphics.Bitmap;
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import android.graphics.BitmapFactory;
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import android.os.Bundle;
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import android.os.Handler;
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import android.os.Message;
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import com.google.zxing.Result;
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import com.zxing.scanner.camera.CameraManager;
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import com.zxing.scanner.common.Scanner;
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import com.zxing.scanner.decode.DecodeThread;
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/**
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* 针对扫描任务的Handler，可接收的message有启动扫描（restart_preview）、扫描成功（decode_succeeded）、扫描失败（decode_failed）等等
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* This class handles all the messaging which comprises the state machine for
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* capture.
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*
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* @author dswitkin@google.com (Daniel Switkin)
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*/
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final class ScannerViewHandler extends Handler {
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public interface HandleDecodeListener {
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void restartPreview();
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void decodeSucceeded(Result rawResult, Bitmap barcode, float scaleFactor);
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}
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private final DecodeThread decodeThread;
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private State state;
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private final CameraManager cameraManager;
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private HandleDecodeListener handleDecodeListener;
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private enum State {
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PREVIEW, SUCCESS, DONE
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}
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ScannerViewHandler(ScannerOptions scannerOptions, CameraManager cameraManager
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, HandleDecodeListener handleDecodeListener) {
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this.cameraManager = cameraManager;
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this.handleDecodeListener = handleDecodeListener;
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//启动扫描线程
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decodeThread = new DecodeThread(cameraManager, this
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, scannerOptions.getDecodeFormats(),scannerOptions.getCharacterSet()
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, scannerOptions.isCreateQrThumbnail());
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decodeThread.start();
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state = State.SUCCESS;
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//开启相机预览界面
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cameraManager.startPreview();
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//将preview回调函数与decodeHandler绑定、调用viewfinderView
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restartPreviewAndDecode();
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}
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@Override
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public void handleMessage(Message message) {
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switch (message.what) {
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case Scanner.RESTART_PREVIEW:
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restartPreviewAndDecode();
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break;
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case Scanner.DECODE_SUCCEEDED:
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state = State.SUCCESS;
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Bundle bundle = message.getData();
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Bitmap barcode = null;
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float scaleFactor = 1.0f;
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if (bundle != null) {
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byte[] compressedBitmap = bundle
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.getByteArray(DecodeThread.BARCODE_BITMAP);
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if (compressedBitmap != null && compressedBitmap.length > 0) {
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barcode = BitmapFactory.decodeByteArray(compressedBitmap,
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0, compressedBitmap.length, null);
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barcode = barcode.copy(Bitmap.Config.ARGB_8888, true);
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}
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scaleFactor = bundle.getFloat(DecodeThread.BARCODE_SCALED_FACTOR);
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}
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if (handleDecodeListener != null)
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handleDecodeListener.decodeSucceeded((Result) message.obj, barcode, scaleFactor);
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break;
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case Scanner.DECODE_FAILED:
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state = State.PREVIEW;
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cameraManager.requestPreviewFrame(decodeThread.getHandler(), Scanner.DECODE);
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break;
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case Scanner.RETURN_SCAN_RESULT:
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break;
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case Scanner.LAUNCH_PRODUCT_QUERY:
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break;
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}
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}
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public void quitSynchronously() {
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state = State.DONE;
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cameraManager.stopPreview();
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Message quit = Message.obtain(decodeThread.getHandler(), Scanner.QUIT);
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quit.sendToTarget();
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try {
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decodeThread.join(500L);
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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removeMessages(Scanner.DECODE_SUCCEEDED);
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removeMessages(Scanner.DECODE_FAILED);
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}
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private void restartPreviewAndDecode() {
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if (state == State.SUCCESS) {
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state = State.PREVIEW;
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cameraManager.requestPreviewFrame(decodeThread.getHandler(), Scanner.DECODE);
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if (handleDecodeListener != null)
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handleDecodeListener.restartPreview();
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}
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}
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}
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