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 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
