将字符串写入文件 [英] Write a string to a file

问题描述

我想在文件中写一些东西.我找到了以下代码:

I want to write something to a file. I found this code:

private void writeToFile(String data) {
    try {
        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(context.openFileOutput("config.txt", Context.MODE_PRIVATE));
        outputStreamWriter.write(data);
        outputStreamWriter.close();
    }
    catch (IOException e) {
        Log.e("Exception", "File write failed: " + e.toString());
    } 
}

该代码似乎非常合乎逻辑，但是我无法在手机中找到config.txt文件.
如何检索包含字符串的文件?

The code seems very logical, but I can't find the config.txt file in my phone.
How can I retrieve that file which includes the string?

推荐答案

未指定路径，您的文件将保存在您的应用空间中(/data/data/your.app.name/).

Not having specified a path, your file will be saved in your app space (/data/data/your.app.name/).

因此，最好将文件保存到外部存储(不一定是SD卡，它可以是默认存储).

Therefore, you better save your file onto an external storage (which is not necessarily the SD card, it can be the default storage).

您可能需要阅读官方文档

综合:

将此权限添加到清单中:

Add this permission to your Manifest:

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

它包含READ权限，因此也无需指定它.

It includes the READ permission, so no need to specify it too.

将文件保存在您指定的位置(该位置取自我的活鳕鱼，所以我确定它可以工作):

Save the file in a location you specify (this is taken from my live cod, so I'm sure it works):

public void writeToFile(String data)
{
    // Get the directory for the user's public pictures directory.
    final File path =
        Environment.getExternalStoragePublicDirectory
        (
            //Environment.DIRECTORY_PICTURES
            Environment.DIRECTORY_DCIM + "/YourFolder/"
        );

    // Make sure the path directory exists.
    if(!path.exists())
    {
        // Make it, if it doesn't exit
        path.mkdirs();
    }

    final File file = new File(path, "config.txt");

    // Save your stream, don't forget to flush() it before closing it.

    try
    {
        file.createNewFile();
        FileOutputStream fOut = new FileOutputStream(file);
        OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);
        myOutWriter.append(data);

        myOutWriter.close();

        fOut.flush();
        fOut.close();
    }
    catch (IOException e)
    {
        Log.e("Exception", "File write failed: " + e.toString());
    } 
}

确定，请尝试以下操作(不同的路径-外部存储设备上的文件夹):

OK Try like this (different path - a folder on the external storage):

    String path =
        Environment.getExternalStorageDirectory() + File.separator  + "yourFolder";
    // Create the folder.
    File folder = new File(path);
    folder.mkdirs();

    // Create the file.
    File file = new File(folder, "config.txt");

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