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/*
* Copyright (C) 2008 Google Inc.
*
* 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.android.barcodes;
import android.app.Activity;
import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import com.google.zxing.Result;
/**
* This class handles all the messaging which comprises the state machine for capture.
*/
public class BarcodesCaptureActivityHandler extends Handler {
private final BarcodesCaptureActivity mActivity;
private final DecodeThread mDecodeThread;
private State mState;
private enum State {
PREVIEW,
SUCCESS,
DONE
}
BarcodesCaptureActivityHandler(BarcodesCaptureActivity activity, String decodeMode) {
mActivity = activity;
mDecodeThread = new DecodeThread(activity, decodeMode);
mDecodeThread.start();
mState = State.SUCCESS;
// Start ourselves capturing previews and decoding.
restartPreviewAndDecode();
}
public void handleMessage(Message message) {
switch (message.what) {
case R.id.auto_focus:
// 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.
CameraManager.get().requestAutoFocus(this, R.id.auto_focus);
break;
case R.id.restart_preview:
restartPreviewAndDecode();
break;
case R.id.decode_succeeded:
mState = State.SUCCESS;
int duration = message.arg1;
mActivity.handleDecode((Result) message.obj, duration);
break;
case R.id.decode_failed:
// We're decoding as fast as possible, so when one decode fails, start another.
mState = State.PREVIEW;
CameraManager.get().requestPreviewFrame(mDecodeThread.mHandler, R.id.decode);
break;
case R.id.return_scan_result:
mActivity.setResult(Activity.RESULT_OK, (Intent) message.obj);
mActivity.finish();
break;
}
}
public void quitSynchronously() {
mState = State.DONE;
CameraManager.get().stopPreview();
Message quit = Message.obtain(mDecodeThread.mHandler, R.id.quit);
quit.sendToTarget();
try {
mDecodeThread.join();
} catch (InterruptedException e) {
}
// 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 (mState == State.SUCCESS) {
mState = State.PREVIEW;
CameraManager.get().startPreview();
CameraManager.get().requestPreviewFrame(mDecodeThread.mHandler, R.id.decode);
CameraManager.get().requestAutoFocus(this, R.id.auto_focus);
mActivity.resetStatusViewColor();
mActivity.drawViewfinder();
}
}
}
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