递归监听文件目录

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    package com.test.fileobserver;                import java.io.File;        import java.util.ArrayList;        import java.util.List;        import java.util.Stack;                import android.os.FileObserver;        import android.util.Log;                @SuppressWarnings(value = { "rawtypes", "unchecked" })        public class RecursiveFileObserver extends FileObserver {                    /** Only modification events */            public static int CHANGES_ONLY = CREATE | DELETE | CLOSE_WRITE                    | DELETE_SELF | MOVE_SELF | MOVED_FROM | MOVED_TO;                    List mObservers;            String mPath;            int mMask;                    public RecursiveFileObserver(String path) {                this(path, ALL_EVENTS);            }                    public RecursiveFileObserver(String path, int mask) {                super(path, mask);                mPath = path;                mMask = mask;            }                    @Override            public void startWatching() {                if (mObservers != null)                    return;                        mObservers = new ArrayList();                Stack stack = new Stack();                stack.push(mPath);                        while (!stack.isEmpty()) {                    String parent = (String)stack.pop();                    mObservers.add(new SingleFileObserver(parent, mMask));                    File path = new File(parent);                    File[] files = path.listFiles();                    if (null == files)                        continue;                    for (File f : files) {                        if (f.isDirectory() && !f.getName().equals(".")                                && !f.getName().equals("..")) {                            stack.push(f.getPath());                        }                    }                }                        for (int i = 0; i < mObservers.size(); i++) {                    SingleFileObserver sfo = (SingleFileObserver) mObservers.get(i);                    sfo.startWatching();                }            };                    @Override            public void stopWatching() {                if (mObservers == null)                    return;                        for (int i = 0; i < mObservers.size(); i++) {                    SingleFileObserver sfo = (SingleFileObserver) mObservers.get(i);                    sfo.stopWatching();                }                                mObservers.clear();                mObservers = null;            };                    @Override            public void onEvent(int event, String path) {                switch (event) {                case FileObserver.ACCESS:                    Log.i("RecursiveFileObserver", "ACCESS: " + path);                    break;                case FileObserver.ATTRIB:                    Log.i("RecursiveFileObserver", "ATTRIB: " + path);                    break;                case FileObserver.CLOSE_NOWRITE:                    Log.i("RecursiveFileObserver", "CLOSE_NOWRITE: " + path);                    break;                case FileObserver.CLOSE_WRITE:                    Log.i("RecursiveFileObserver", "CLOSE_WRITE: " + path);                    break;                case FileObserver.CREATE:                    Log.i("RecursiveFileObserver", "CREATE: " + path);                    break;                case FileObserver.DELETE:                    Log.i("RecursiveFileObserver", "DELETE: " + path);                    break;                case FileObserver.DELETE_SELF:                    Log.i("RecursiveFileObserver", "DELETE_SELF: " + path);                    break;                case FileObserver.MODIFY:                    Log.i("RecursiveFileObserver", "MODIFY: " + path);                    break;                case FileObserver.MOVE_SELF:                    Log.i("RecursiveFileObserver", "MOVE_SELF: " + path);                    break;                case FileObserver.MOVED_FROM:                    Log.i("RecursiveFileObserver", "MOVED_FROM: " + path);                    break;                case FileObserver.MOVED_TO:                    Log.i("RecursiveFileObserver", "MOVED_TO: " + path);                    break;                case FileObserver.OPEN:                    Log.i("RecursiveFileObserver", "OPEN: " + path);                    break;                default:                    Log.i("RecursiveFileObserver", "DEFAULT(" + event + " : " + path);                    break;                }            }                    /**            * Monitor single directory and dispatch all events to its parent, with full            * path.            */            class SingleFileObserver extends FileObserver {                String mPath;                        public SingleFileObserver(String path) {                    this(path, ALL_EVENTS);                    mPath = path;                }                        public SingleFileObserver(String path, int mask) {                    super(path, mask);                    mPath = path;                }                        @Override                public void onEvent(int event, String path) {                    String newPath = mPath + "/" + path;                    RecursiveFileObserver.this.onEvent(event, newPath);                }            }        }
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