FileObserver实例将被垃圾回收 [英] FileObserver instance is being garbage collected

问题描述

我需要监视的文件夹中的所有文件，当文件打开（FileObserver.OPEN）我想执行的方法。问题是有些时候，FileObserver实例由GC回收，我想这样的：

I need to monitor all files in a folder, when a file opened (FileObserver.OPEN) I want to execute a method. The problem is some times, the FileObserver instance is collected by GC, I tried this:

    final MyFileObserver fo = new MyFileObserver("/mnt/sdcard/Musicas");
    threadFileObserver = new Runnable() {
        @Override
        public void run() {
            fo.startWatching();
        }
    };
    t = new Thread(threadFileObserver);
    t.run();

不过被收集。 现在的问题是，什么是FileObserver的实例，不收取？

But is being collected. The question is, what is the best solution for a instance of FileObserver not be collected?

TKS !!!

推荐答案

我猜startWatching（）方法立即返回，你的线程完成运行，和你的方法返回。在这一点上，你的FileObserver，作为一个局部变量，是不可见的，从任何地方。你的线程运行完毕，也没有提到它。两者都是垃圾收集。定义FileObserver为静态变量或者未垃圾回收，而不是在方法的局部变量的东西字段。

I'm guessing the startWatching() method returns immediately, your Thread finishes running, and your method returns. At this point, your FileObserver, being a local variable, is not visible from anywhere. Your thread has finished running and there is no reference to it. Both are garbage collected. Define the FileObserver as a static variable or a field in something that isn't garbage collected, not as a local variable in a method.

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