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Android example source code file (FileObserver.java)
The FileObserver.java Android example source code/* * Copyright (C) 2006 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package android.os; import android.util.Log; import com.android.internal.os.RuntimeInit; import java.lang.ref.WeakReference; import java.util.ArrayList; import java.util.HashMap; /** * Monitors files (using <a href="http://en.wikipedia.org/wiki/Inotify">inotify) * to fire an event after files are accessed or changed by by any process on * the device (including this one). FileObserver is an abstract class; * subclasses must implement the event handler {@link #onEvent(int, String)}. * * <p>Each FileObserver instance monitors a single file or directory. * If a directory is monitored, events will be triggered for all files and * subdirectories (recursively) inside the monitored directory.</p> * * <p>An event mask is used to specify which changes or actions to report. * Event type constants are used to describe the possible changes in the * event mask as well as what actually happened in event callbacks.</p> * * <p class="caution">Warning: If a FileObserver is garbage collected, it * will stop sending events. To ensure you keep receiving events, you must * keep a reference to the FileObserver instance from some other live object.</p> */ public abstract class FileObserver { /** Event type: Data was read from a file */ public static final int ACCESS = 0x00000001; /** Event type: Data was written to a file */ public static final int MODIFY = 0x00000002; /** Event type: Metadata (permissions, owner, timestamp) was changed explicitly */ public static final int ATTRIB = 0x00000004; /** Event type: Someone had a file or directory open for writing, and closed it */ public static final int CLOSE_WRITE = 0x00000008; /** Event type: Someone had a file or directory open read-only, and closed it */ public static final int CLOSE_NOWRITE = 0x00000010; /** Event type: A file or directory was opened */ public static final int OPEN = 0x00000020; /** Event type: A file or subdirectory was moved from the monitored directory */ public static final int MOVED_FROM = 0x00000040; /** Event type: A file or subdirectory was moved to the monitored directory */ public static final int MOVED_TO = 0x00000080; /** Event type: A new file or subdirectory was created under the monitored directory */ public static final int CREATE = 0x00000100; /** Event type: A file was deleted from the monitored directory */ public static final int DELETE = 0x00000200; /** Event type: The monitored file or directory was deleted; monitoring effectively stops */ public static final int DELETE_SELF = 0x00000400; /** Event type: The monitored file or directory was moved; monitoring continues */ public static final int MOVE_SELF = 0x00000800; /** Event mask: All valid event types, combined */ public static final int ALL_EVENTS = ACCESS | MODIFY | ATTRIB | CLOSE_WRITE | CLOSE_NOWRITE | OPEN | MOVED_FROM | MOVED_TO | DELETE | CREATE | DELETE_SELF | MOVE_SELF; private static final String LOG_TAG = "FileObserver"; private static class ObserverThread extends Thread { private HashMap<Integer, WeakReference> m_observers = new HashMap Other Android examples (source code examples)Here is a short list of links related to this Android FileObserver.java source code file: |
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