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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 
17 package com.google.zxing.client.android.camera;
18 
19 import android.hardware.Camera;
20 import android.os.Handler;
21 import android.os.Message;
22 import android.util.Log;
23 
24 final 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 
setHandler(Handler autoFocusHandler, int autoFocusMessage)33   void setHandler(Handler autoFocusHandler, int autoFocusMessage) {
34     this.autoFocusHandler = autoFocusHandler;
35     this.autoFocusMessage = autoFocusMessage;
36   }
37 
onAutoFocus(boolean success, Camera camera)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