/*
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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.tejia.lijin.app.util.zxing.android;
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import android.app.Activity;
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import android.content.Intent;
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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.tejia.lijin.app.ui.recommend.CaptureActivity;
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import com.tejia.lijin.app.util.zxing.camera.CameraManager;
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import com.tejia.lijin.app.util.zxing.common.Constant;
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import com.tejia.lijin.app.util.zxing.decode.DecodeThread;
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import com.tejia.lijin.app.util.zxing.view.ViewfinderResultPointCallback;
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/**
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* This class handles all the messaging which comprises the state machine for
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* capture. 该类用于处理有关拍摄状态的所有信息
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*
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* @author dswitkin@google.com (Daniel Switkin)
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*/
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public final class CaptureActivityHandler extends Handler {
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private static final String TAG = CaptureActivityHandler.class
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.getSimpleName();
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private final CaptureActivity activity;
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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 enum State {
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PREVIEW, SUCCESS, DONE
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}
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public CaptureActivityHandler(CaptureActivity activity,CameraManager cameraManager) {
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this.activity = activity;
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decodeThread = new DecodeThread(activity, new ViewfinderResultPointCallback(
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activity.getViewfinderView()));
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decodeThread.start();
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state = State.SUCCESS;
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// Start ourselves capturing previews and decoding.
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// 开始拍摄预览和解码
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this.cameraManager = cameraManager;
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cameraManager.startPreview();
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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 Constant.RESTART_PREVIEW:
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// 重新预览
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restartPreviewAndDecode();
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break;
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case Constant.DECODE_SUCCEEDED:
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// 解码成功
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state = State.SUCCESS;
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activity.handleDecode((Result) message.obj);
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break;
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case Constant.DECODE_FAILED:
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// 尽可能快的解码，以便可以在解码失败时，开始另一次解码
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state = State.PREVIEW;
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cameraManager.requestPreviewFrame(decodeThread.getHandler(),
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Constant.DECODE);
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break;
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case Constant.RETURN_SCAN_RESULT:
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activity.setResult(Activity.RESULT_OK, (Intent) message.obj);
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activity.finish();
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break;
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case Constant.FLASH_OPEN:
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activity.switchFlashImg(Constant.FLASH_OPEN);
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break;
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case Constant.FLASH_CLOSE:
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activity.switchFlashImg(Constant.FLASH_CLOSE);
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break;
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}
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}
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/**
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* 完全退出
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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(), Constant.QUIT);
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quit.sendToTarget();
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try {
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// Wait at most half a second; should be enough time, and onPause()
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// will timeout quickly
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decodeThread.join(500L);
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} catch (InterruptedException e) {
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// continue
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}
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// Be absolutely sure we don't send any queued up messages
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//确保不会发送任何队列消息
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removeMessages(Constant.DECODE_SUCCEEDED);
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removeMessages(Constant.DECODE_FAILED);
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}
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public 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(),
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Constant.DECODE);
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activity.drawViewfinder();
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}
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}
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}
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