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;
24 final class PreviewCallback implements Camera.PreviewCallback {
26 private final CameraConfigurationManager configManager;
27 private final boolean useOneShotPreviewCallback;
28 private Handler previewHandler;
29 private int previewMessage;
31 PreviewCallback(CameraConfigurationManager configManager, boolean useOneShotPreviewCallback) {
32 this.configManager = configManager;
33 this.useOneShotPreviewCallback = useOneShotPreviewCallback;
36 void setHandler(Handler previewHandler, int previewMessage) {
37 this.previewHandler = previewHandler;
38 this.previewMessage = previewMessage;
41 public void onPreviewFrame(byte[] data, Camera camera) {
42 Point cameraResolution = configManager.getCameraResolution();
43 if (!useOneShotPreviewCallback) {
44 camera.setPreviewCallback(null);
46 if (previewHandler != null) {
47 Message message = previewHandler.obtainMessage(previewMessage, cameraResolution.x,
48 cameraResolution.y, data);
49 message.sendToTarget();
50 previewHandler = null;