写文件在Android中不工作 [英] Writing to file not working in Android

问题描述

我试图写在Android的一个文本文件中。我的code是如下（以服务运行）：

I am trying to write to a text file in Android. My code is as follows (running in a Service):

    File log;                 String state = Environment.getExternalStorageState();
    File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
    if (Environment.MEDIA_MOUNTED.equals(state) || Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
        log = new File(path, "log.csv");
        System.out.println("Opening file");
    } else {
        System.err.println("Could not write to external storage medium. No log will be created");
        return;
    }
    String line = "stuff";
    if (!log.exists()) {
        try {
            log.createNewFile();
            System.out.println("Creating new log file.");
        } catch (IOException e) {
            System.err.println("Could not create new log file");
            e.printStackTrace();
            return;
        }
    }
    try {
        path.mkdirs();
        BufferedWriter bw = new BufferedWriter(new FileWriter(log, true));
        bw.append(line);
        System.out.println("Appending to log file.");
        bw.newLine();
        bw.flush();
        bw.close();
    } catch (IOException e) {
        System.err.println("Failed to write to log file");
        e.printStackTrace();
        return;
    }

和我已经把下面一行在AndroidManifest.xml：

And I have put the following line in AndroidManifest.xml:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

当我运行此，下面是印在LogCat中：

When I run this, the following is printed in LogCat:

Opening file
Appending to log file.

但我不能找到在手机内存中的特定名称的任何文件，尽管在寻找所需的目录并运行一个搜索，看它是否是别的地方吧。

But I can't find any files with the given name on the phone's memory, despite looking in the desired directory and running a search to see if it's somewhere else instead.

我不知道有什么可以去错了。有任何想法吗？谢谢！

I'm not sure what could be going wrong. Any ideas? Thanks!

推荐答案

如果它是一个真正的设备（未AVD），那么我认为这是通过USB插入计算机。某些设置不允许，而它的插入到电脑上浏览外部存储。拔掉它，并查找文件。

If it's a real device (not AVD), then I think it's plugged into your computer via USB. Some settings doesn't allow to browse external storage while it's plugged to a computer. Unplug it, and look for the file.

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