CaptureActivityHandler.java
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/*
* 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.yzq.zxinglibrary.android;
import android.app.Activity;
import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import com.google.zxing.Result;
import com.yzq.zxinglibrary.camera.CameraManager;
import com.yzq.zxinglibrary.common.Constant;
import com.yzq.zxinglibrary.decode.DecodeThread;
import com.yzq.zxinglibrary.view.ViewfinderResultPointCallback;
/**
* This class handles all the messaging which comprises the state machine for
* capture. 该类用于处理有关拍摄状态的所有信息
*
* @author dswitkin@google.com (Daniel Switkin)
*/
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 final CameraManager cameraManager;
private enum State {
PREVIEW, SUCCESS, DONE
}
public CaptureActivityHandler(CaptureActivity activity,CameraManager cameraManager) {
this.activity = activity;
decodeThread = new DecodeThread(activity, new ViewfinderResultPointCallback(
activity.getViewfinderView()));
decodeThread.start();
state = State.SUCCESS;
// Start ourselves capturing previews and decoding.
// 开始拍摄预览和解码
this.cameraManager = cameraManager;
cameraManager.startPreview();
restartPreviewAndDecode();
}
@Override
public void handleMessage(Message message) {
switch (message.what) {
case Constant.RESTART_PREVIEW:
// 重新预览
restartPreviewAndDecode();
break;
case Constant.DECODE_SUCCEEDED:
// 解码成功
state = State.SUCCESS;
activity.handleDecode((Result) message.obj);
break;
case Constant.DECODE_FAILED:
// 尽可能快的解码，以便可以在解码失败时，开始另一次解码
state = State.PREVIEW;
cameraManager.requestPreviewFrame(decodeThread.getHandler(),
Constant.DECODE);
break;
case Constant.RETURN_SCAN_RESULT:
activity.setResult(Activity.RESULT_OK, (Intent) message.obj);
activity.finish();
break;
}
}
/**
* 完全退出
*/
public void quitSynchronously() {
state = State.DONE;
cameraManager.stopPreview();
Message quit = Message.obtain(decodeThread.getHandler(), Constant.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
//确保不会发送任何队列消息
removeMessages(Constant.DECODE_SUCCEEDED);
removeMessages(Constant.DECODE_FAILED);
}
public void restartPreviewAndDecode() {
if (state == State.SUCCESS) {
state = State.PREVIEW;
cameraManager.requestPreviewFrame(decodeThread.getHandler(),
Constant.DECODE);
activity.drawViewfinder();
}
}
}