2 * Copyright (C) 2010 ZXing authors
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package com.google.zxing.client.android.camera;
19 import android.graphics.Point;
20 import android.hardware.Camera;
21 import android.os.Handler;
22 import android.os.Message;
23 import android.util.Log;
25 final class PreviewCallback implements Camera.PreviewCallback {
27 private static final String TAG = PreviewCallback.class.getSimpleName();
29 private final CameraConfigurationManager configManager;
30 private final boolean useOneShotPreviewCallback;
31 private Handler previewHandler;
32 private int previewMessage;
34 PreviewCallback(CameraConfigurationManager configManager, boolean useOneShotPreviewCallback) {
35 this.configManager = configManager;
36 this.useOneShotPreviewCallback = useOneShotPreviewCallback;
39 void setHandler(Handler previewHandler, int previewMessage) {
40 this.previewHandler = previewHandler;
41 this.previewMessage = previewMessage;
44 public void onPreviewFrame(byte[] data, Camera camera) {
45 Point cameraResolution = configManager.getCameraResolution();
46 if (!useOneShotPreviewCallback) {
47 camera.setPreviewCallback(null);
49 if (previewHandler != null) {
50 Message message = previewHandler.obtainMessage(previewMessage, cameraResolution.x,
51 cameraResolution.y, data);
52 Log.v(TAG, "Got preview callback; sending message to decoder");
53 message.sendToTarget();
54 previewHandler = null;
56 Log.v(TAG, "Got preview callback, but no handler for it");