19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2006 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.os; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.util.Log; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.lang.ref.WeakReference; 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.util.HashMap; 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 243dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor/** 253dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * Monitors files (using <a href="http://en.wikipedia.org/wiki/Inotify">inotify</a>) 263dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * to fire an event after files are accessed or changed by by any process on 273dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * the device (including this one). FileObserver is an abstract class; 283dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * subclasses must implement the event handler {@link #onEvent(int, String)}. 293dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * 303dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * <p>Each FileObserver instance monitors a single file or directory. 313dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * If a directory is monitored, events will be triggered for all files and 326aad995042599dd0f5def79fea85cee90439c9a8Scott Main * subdirectories inside the monitored directory.</p> 333dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * 343dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * <p>An event mask is used to specify which changes or actions to report. 353dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * Event type constants are used to describe the possible changes in the 363dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * event mask as well as what actually happened in event callbacks.</p> 373dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * 383dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * <p class="caution"><b>Warning</b>: If a FileObserver is garbage collected, it 393dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * will stop sending events. To ensure you keep receiving events, you must 403dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * keep a reference to the FileObserver instance from some other live object.</p> 413dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor */ 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic abstract class FileObserver { 433dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor /** Event type: Data was read from a file */ 449bb8fd77c8dc177aab9ac96bed4f55972dcda70aJoe Onorato public static final int ACCESS = 0x00000001; 453dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor /** Event type: Data was written to a file */ 469bb8fd77c8dc177aab9ac96bed4f55972dcda70aJoe Onorato public static final int MODIFY = 0x00000002; 473dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor /** Event type: Metadata (permissions, owner, timestamp) was changed explicitly */ 489bb8fd77c8dc177aab9ac96bed4f55972dcda70aJoe Onorato public static final int ATTRIB = 0x00000004; 493dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor /** Event type: Someone had a file or directory open for writing, and closed it */ 509bb8fd77c8dc177aab9ac96bed4f55972dcda70aJoe Onorato public static final int CLOSE_WRITE = 0x00000008; 513dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor /** Event type: Someone had a file or directory open read-only, and closed it */ 529bb8fd77c8dc177aab9ac96bed4f55972dcda70aJoe Onorato public static final int CLOSE_NOWRITE = 0x00000010; 533dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor /** Event type: A file or directory was opened */ 549bb8fd77c8dc177aab9ac96bed4f55972dcda70aJoe Onorato public static final int OPEN = 0x00000020; 553dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor /** Event type: A file or subdirectory was moved from the monitored directory */ 569bb8fd77c8dc177aab9ac96bed4f55972dcda70aJoe Onorato public static final int MOVED_FROM = 0x00000040; 573dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor /** Event type: A file or subdirectory was moved to the monitored directory */ 589bb8fd77c8dc177aab9ac96bed4f55972dcda70aJoe Onorato public static final int MOVED_TO = 0x00000080; 593dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor /** Event type: A new file or subdirectory was created under the monitored directory */ 609bb8fd77c8dc177aab9ac96bed4f55972dcda70aJoe Onorato public static final int CREATE = 0x00000100; 613dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor /** Event type: A file was deleted from the monitored directory */ 629bb8fd77c8dc177aab9ac96bed4f55972dcda70aJoe Onorato public static final int DELETE = 0x00000200; 633dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor /** Event type: The monitored file or directory was deleted; monitoring effectively stops */ 649bb8fd77c8dc177aab9ac96bed4f55972dcda70aJoe Onorato public static final int DELETE_SELF = 0x00000400; 653dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor /** Event type: The monitored file or directory was moved; monitoring continues */ 669bb8fd77c8dc177aab9ac96bed4f55972dcda70aJoe Onorato public static final int MOVE_SELF = 0x00000800; 679bb8fd77c8dc177aab9ac96bed4f55972dcda70aJoe Onorato 683dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor /** Event mask: All valid event types, combined */ 693dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor public static final int ALL_EVENTS = ACCESS | MODIFY | ATTRIB | CLOSE_WRITE 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project | CLOSE_NOWRITE | OPEN | MOVED_FROM | MOVED_TO | DELETE | CREATE 71d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor | DELETE_SELF | MOVE_SELF; 729bb8fd77c8dc177aab9ac96bed4f55972dcda70aJoe Onorato 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static final String LOG_TAG = "FileObserver"; 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static class ObserverThread extends Thread { 76d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor private HashMap<Integer, WeakReference> m_observers = new HashMap<Integer, WeakReference>(); 77d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor private int m_fd; 78d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor 79d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor public ObserverThread() { 80d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor super("FileObserver"); 81d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor m_fd = init(); 82d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor } 83d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor 84d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor public void run() { 85d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor observe(m_fd); 86d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor } 87d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor 88d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor public int startWatching(String path, int mask, FileObserver observer) { 89d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor int wfd = startWatching(m_fd, path, mask); 90d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor 91d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor Integer i = new Integer(wfd); 92d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor if (wfd >= 0) { 93d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor synchronized (m_observers) { 94d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor m_observers.put(i, new WeakReference(observer)); 95d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor } 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 97d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor 98d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor return i; 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 101d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor public void stopWatching(int descriptor) { 102d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor stopWatching(m_fd, descriptor); 103d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor } 104d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor 105d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor public void onEvent(int wfd, int mask, String path) { 106d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor // look up our observer, fixing up the map if necessary... 107d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor FileObserver observer = null; 108d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor 109d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor synchronized (m_observers) { 110d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor WeakReference weak = m_observers.get(wfd); 111d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor if (weak != null) { // can happen with lots of events from a dead wfd 112d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor observer = (FileObserver) weak.get(); 113d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor if (observer == null) { 114d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor m_observers.remove(wfd); 115d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor } 116d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor } 117d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor } 118d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor 119d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor // ...then call out to the observer without the sync lock held 120d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor if (observer != null) { 121d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor try { 122d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor observer.onEvent(mask, path); 123d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor } catch (Throwable throwable) { 124d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor Log.wtf(LOG_TAG, "Unhandled exception in FileObserver " + observer, throwable); 125d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor } 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 129d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor private native int init(); 130d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor private native void observe(int fd); 131d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor private native int startWatching(int fd, String path, int mask); 132d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor private native void stopWatching(int fd, int wfd); 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static ObserverThread s_observerThread; 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static { 138d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor s_observerThread = new ObserverThread(); 139d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor s_observerThread.start(); 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // instance 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private String m_path; 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private Integer m_descriptor; 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int m_mask; 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1473dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor /** 1483dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * Equivalent to FileObserver(path, FileObserver.ALL_EVENTS). 1493dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor */ 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public FileObserver(String path) { 151d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor this(path, ALL_EVENTS); 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1543dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor /** 1553dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * Create a new file observer for a certain file or directory. 1563dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * Monitoring does not start on creation! You must call 1573dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * {@link #startWatching()} before you will receive events. 1583dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * 1593dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * @param path The file or directory to monitor 1603dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * @param mask The event or events (added together) to watch for 1613dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor */ 1629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public FileObserver(String path, int mask) { 163d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor m_path = path; 164d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor m_mask = mask; 165d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor m_descriptor = -1; 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void finalize() { 169d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor stopWatching(); 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1723dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor /** 1733dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * Start watching for events. The monitored file or directory must exist at 1743dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * this time, or else no events will be reported (even if it appears later). 1753dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * If monitoring is already started, this call has no effect. 1763dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor */ 1779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void startWatching() { 178d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor if (m_descriptor < 0) { 179d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor m_descriptor = s_observerThread.startWatching(m_path, m_mask, this); 180d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor } 1819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1833dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor /** 1843dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * Stop watching for events. Some events may be in process, so events 1853dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * may continue to be reported even after this method completes. If 1863dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * monitoring is already stopped, this call has no effect. 1873dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor */ 1889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void stopWatching() { 189d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor if (m_descriptor >= 0) { 190d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor s_observerThread.stopWatching(m_descriptor); 191d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor m_descriptor = -1; 192d95244faef7b54fe46223aec1ed5754cd9b74a3eDan Egnor } 1939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1953dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor /** 1963dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * The event handler, which must be implemented by subclasses. 1973dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * 1983dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * <p class="note">This method is invoked on a special FileObserver thread. 1993dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * It runs independently of any threads, so take care to use appropriate 2003dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * synchronization! Consider using {@link Handler#post(Runnable)} to shift 2013dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * event handling work to the main thread to avoid concurrency problems.</p> 2023dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * 2033dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * <p>Event handlers must not throw exceptions.</p> 2043dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * 2053dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * @param event The type of event which happened 2063dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * @param path The path, relative to the main monitored file or directory, 2073dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor * of the file or directory which triggered the event 2083dc1c7f5e84a888bc0a3aee764e9c6fa01395d8aDan Egnor */ 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public abstract void onEvent(int event, String path); 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 211