1/*
2 * Copyright (C) 2010 ZXing authors
3 *
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
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
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.
15 */
16
17package com.google.zxing.client.android.camera;
18
19import android.hardware.Camera;
20import android.os.Handler;
21import android.os.Message;
22import android.util.Log;
23
24final class AutoFocusCallback implements Camera.AutoFocusCallback {
25
26  private static final String TAG = AutoFocusCallback.class.getSimpleName();
27
28  private static final long AUTOFOCUS_INTERVAL_MS = 1500L;
29
30  private Handler autoFocusHandler;
31  private int autoFocusMessage;
32
33  void setHandler(Handler autoFocusHandler, int autoFocusMessage) {
34    this.autoFocusHandler = autoFocusHandler;
35    this.autoFocusMessage = autoFocusMessage;
36  }
37
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;
46    } else {
47      Log.d(TAG, "Got auto-focus callback, but no handler for it");
48    }
49  }
50
51}
52