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android FileObserver

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cheyiliu edited this page Oct 8, 2014 · 4 revisions 
/**
 * Monitors files (using <a href="http://en.wikipedia.org/wiki/Inotify">inotify</a>)
 * 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 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"><b>Warning</b>: 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>
 */

    /** 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;

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