FileObserver得到奇怪的事件

Question

好的,这很简单:我有一个FileObserver类来观察带有音乐的文件夹.所以我实现了onEvent和所有这些东西,但当我使用文件管理器移动或粘贴该文件夹上的文件时,而不是获取FileObserver.MOVED_TO或FileObserver.CREATE,我得到的奇怪事件的数字如1073741656,未记录在:http: //developer.android.com/reference/android/os/FileObserver.html

那么如何获取删除,移动,创建和粘贴等特定事件？

[编辑]这是代码:

 private class MusicsFileObserver extends FileObserver {

    public MusicsFileObserver(String root) {
        super(root);

        if (!root.endsWith(File.separator)) {
            root += File.separator;
        }
    }

    @SuppressWarnings("unused")
    public void close() {
        super.finalize();
    }

    public void onEvent(final int event, String path) {
      //here is the problem, if you see the documentation, when a file is moved 
      //to this directory, event should be equal to FileObserver.MOVED_TO, 
      //a constant value of 128. But when debugging, instead of entering here one time
      //with event == 128, this method onEvent is being called 4~5 times with event
      //with numbers like 1073741656
        if (event != FileObserver.ACCESS || event != FileObserver.OPEN || event != 32768)
            runOnUiThread(new Runnable() {
                public void run() {
                    rescanMusics();
                }
            });
    }
}

Answer 1

对于遇到此问题的其他任何人,我发现MOVED_TO和MOVED_FROM事件在事件标志中打开了高位.MOVED_FROM是0x40000040,MOVED_TO是0x40000080.解决方法是简单地使用事件代码'和'ALL_EVENTS来关闭高位,即"event&= FileObserver.ALL_EVENTS"

更新:我发现你可以从http://rswiki.csie.org/lxr/http/source/include/linux/inotify.h?a=m68k#L45获得inotify标志,如果google添加这些标志会很好FileObserver doc的位标志.

Answer 2

观察者事件类型如下：

public void onEvent(int event) {
      if ((FileObserver.CREATE & event)!=0) {
        // do what ever you want.
      } else if ((FileObserver.MODIFY & event)!=0) {
        // do what ever you want.           
      } ...... etc
}