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.hardware.Camera;
20 import android.os.Handler;
21 import android.os.Message;
22 import android.util.Log;
24 final class AutoFocusCallback implements Camera.AutoFocusCallback {
26 private static final String TAG = AutoFocusCallback.class.getSimpleName();
28 private static final long AUTOFOCUS_INTERVAL_MS = 1500L;
30 private Handler autoFocusHandler;
31 private int autoFocusMessage;
33 void setHandler(Handler autoFocusHandler, int autoFocusMessage) {
34 this.autoFocusHandler = autoFocusHandler;
35 this.autoFocusMessage = autoFocusMessage;
38 public void onAutoFocus(boolean success, Camera camera) {
39 if (autoFocusHandler != null) {
40 Message message = autoFocusHandler.obtainMessage(autoFocusMessage, success);
41 // Simulate continuous autofocus by sending a focus request every
42 // AUTOFOCUS_INTERVAL_MS milliseconds.
43 //Log.d(TAG, "Got auto-focus callback; requesting another");
44 autoFocusHandler.sendMessageDelayed(message, AUTOFOCUS_INTERVAL_MS);
45 autoFocusHandler = null;
47 Log.d(TAG, "Got auto-focus callback, but no handler for it");