文件观察者停止一段时间后工作 [英] File observer stops working after some time

问题描述

我要听文件system.I发生的变化正在使用
FileObserver.Here是我的code：

I want to listen to the changes occured in file system.I am using FileObserver.Here is my code:

code：

class MyDirObserver extends FileObserver {
    String superPath;
    public MyDirObserver(String path) {
        super(path, ALL_EVENTS);
        this.superPath = path;
    }


    public void onEvent(int event, String path) {
        Log.e("onEvent of Directory", "=== onEvent ===");
        try {
            _Dump("dir", event, path, superPath);
        } catch (NullPointerException ex) {
            Log.e("ERROR", "I am getting error");
        }
    }
}


private void _Dump(final String tag, int event, String path, String superPath) {
    Log.d(tag, "=== dump begin ===");
    Log.d(tag, "path=" + path);
    Log.d(tag, "super path=" + superPath);
    Log.d(tag, "event list:");
    if ((event & FileObserver.OPEN) != 0) {
        Log.d(tag, "  OPEN");
    }
    if ((event & FileObserver.CLOSE_NOWRITE) != 0) {
        Log.d(tag, "  CLOSE_NOWRITE");
    }
    if ((event & FileObserver.CLOSE_WRITE) != 0) {


        Log.d(tag, "  CLOSE_WRITE");
        Log.i("NEWFILEOBSERVER", "File is Modified");
        if (path != null) {
            Log.d("---------FilePath", superPath + path);
        }


    }
    if ((event & FileObserver.CREATE) != 0) {
        isCreate = true;
        Log.i("NEWFILEOBSERVER", "File is Created ");
        if (path != null) {
            Log.d("---------FilePath", superPath + path);
        }
        Log.d(tag, "  CREATE");


    }
    if ((event & FileObserver.DELETE) != 0) {
        Log.i("NEWFILEOBSERVER", "File is deleted");
        if (path != null) {
            Log.d("---------FilePath", superPath + path);
        }
        //  startMyActivity("A new file is deleted thats="+superPath); 


        Log.d(tag, "  DELETE");


    }

    if ((event & FileObserver.DELETE_SELF) != 0) {
        Log.d(tag, "  DELETE_SELF");
    }

    if ((event & FileObserver.ACCESS) != 0) {
        Log.d(tag, "  ACCESS");
    }

    if ((event & FileObserver.MODIFY) != 0) {
        if (!isModified)
            isModified = true;

        if (isModified && isOpen)
            isAgainModified = true;
        Log.d(tag, "  MODIFY");
    }

    if ((event & FileObserver.MOVED_FROM) != 0) {
        Log.d(tag, "  MOVED_FROM");
        if (path != null) {
            Log.d("---------FilePath", superPath + path);
        }
    }

    if ((event & FileObserver.MOVED_TO) != 0) {
        Log.d(tag, "  MOVED_TO");
        if (path != null) {
            Log.d("---------FilePath", superPath + path);
        }
    }

    if ((event & FileObserver.MOVE_SELF) != 0) {
        Log.d(tag, "  MOVE_SELF");
    }

    if ((event & FileObserver.ATTRIB) != 0) {
        Log.d(tag, "  ATTRIB");
    }

    Log.d(tag, "=== dump end ===");
}

它的一些再寄一次后停止没有得到确切的时间，但犯规
虽然我在服务中运行为SD卡所有的文件夹，并调用startWatching（）为每个循环调用startWatching（）总是工作。它显示未predictable行为，并停止监听一些文件夹和完美的运行为其他。

it stops after some time.I dont get the exact time but doesnt work always though I call startWatching() in service in a loop which runs for all the folders of sdcard and calls startWatching() for each of them. It shows unpredictable behaviour and stops listening for some folders and runs perfectly for the others.

我希望你们能帮我。我试过很多方法，但它不工作
完美。难道我做错了什么？还是有一些其他的方式来做到这一点。

I hope you guys help me. I tried many ways but it doesn't work perfectly. Am I doing something wrong? Or is there some other way to do this.

推荐答案

<一个href=\"http://developer.android.com/reference/android/os/FileObserver.html\">http://developer.android.com/reference/android/os/FileObserver.html

警告：如果一个FileObserver被垃圾回收，它将停止发送事件。为了确保您继续接收事件，必须从其他活动对象保留对FileObserver实例的引用。

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.

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