1 /* 2 * Copyright (C) 2013 The Android Open Source Project 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.android.camera.data; 18 19 import android.database.ContentObserver; 20 21 /** 22 * Listening to the changes to the local image and video data. onChange will 23 * happen on the main thread. 24 */ 25 public class FilmstripContentObserver extends ContentObserver { 26 27 private ChangeListener mChangeListener; 28 29 public interface ChangeListener { onChange()30 public void onChange(); 31 } 32 33 private boolean mActivityPaused = false; 34 private boolean mMediaDataChangedDuringPause = false; 35 FilmstripContentObserver()36 public FilmstripContentObserver() { 37 super(null); 38 } 39 setForegroundChangeListener(ChangeListener changeListener)40 public void setForegroundChangeListener(ChangeListener changeListener) { 41 mChangeListener = changeListener; 42 } 43 removeForegroundChangeListener()44 public void removeForegroundChangeListener() { 45 mChangeListener = null; 46 } 47 48 /** 49 * When the activity is paused and MediaObserver get onChange() call, then 50 * we would like to set a dirty bit to reload the data at onResume(). 51 */ 52 @Override onChange(boolean selfChange)53 public void onChange(boolean selfChange) { 54 if (mChangeListener != null) { 55 mChangeListener.onChange(); 56 } 57 if (mActivityPaused) { 58 mMediaDataChangedDuringPause = true; 59 } 60 } 61 setActivityPaused(boolean paused)62 public void setActivityPaused(boolean paused) { 63 mActivityPaused = paused; 64 if (!paused) { 65 mMediaDataChangedDuringPause = false; 66 } 67 } 68 isMediaDataChangedDuringPause()69 public boolean isMediaDataChangedDuringPause() { 70 return mMediaDataChangedDuringPause; 71 } 72 } 73