如何从内部存储读取(子文件夹下载)? [英] How to read from the internal storage (subfolder Download)?

问题描述

经过大量搜索后，我无法找到如何从内部存储器(子文件夹下载)中读取配置文件(xml)的信息.我尝试访问/mnt/sdcard/Download/config.xml，但收到异常.

After intensive search I could not find out how to read a configuration file (xml) from the internal storage (sub-folder download). I tried to access /mnt/sdcard/Download/config.xml but received an Exception.

当试图从两个可能的供应商ApplicationContext和Environment获取可用文件夹时，我得到了以下信息:

When trying to get the available folders from the two possible suppliers ApplicationContext and Environment, I get these informations:

context.getFilesDir().getAbsolutePath(); // /data/data/com.xxx.yyy/files

context.getDir("Download", 0).getAbsolutePath();
// /data/data/com.xxx.yyy/app_Download

context.getDir("Download", 1).getAbsolutePath();
// /data/data/com.xxx.yyy/app_Download

Environment.getExternalStorageDirectory().getAbsolutePath();
// /storage/emulated/0
context.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath();
// /storage/emulated/0/Android/data/com.xxx.yyy/files/Download

Environment.getDataDirectory().getPath();
// /data

当我尝试这些信息以访问下载文件夹中的 config.xml (我通过Windows资源管理器手动复制文件)时，出现错误，例如FileNotFoundException或IllegalArgumentException.

When I try these information to access the config.xml in the Download-folder (I manually copied the file over the Windows explorer) I receive errors, e.g. FileNotFoundException or IllegalArgumentException.

我的文件在哪里，如何正确访问它?

Where is my file, and how can I access it properly?

推荐答案

1. 在AndroidManifest.xml中设置读取权限:

1. Set the Read-Permission in your AndroidManifest.xml:

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

使用以下代码:

Use the following code:

String filename = Environment.getExternalStorageDirectory().getPath() + File.separator + "download" + File.separator + "config.xml";

将filename用于任何您想做的事情.

Use filename for whatever you want to do.

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