无法从目录中读取文件 - android
我的项目中有一个目录 /sdcard/audio 。该目录包含一些音频（wav）文件。
这是我正在尝试做的事情：
1.从目录中读取。
2. 播放wav 文件。
我编写的用于访问目录的代码如下：
String path_to_media = "/sdcard/audio/";
File dirEffectFiles = new File(path_to_media); //gets a handle to the directory of effect files.
Log.v(this.toString(), "Getting into path = " + path_to_media);
Log.v(this.toString(), "Some details about the directory: path = " + dirEffectFiles.getPath()
+ " Can read: " + dirEffectFiles.canRead() + " list:" + dirEffectFiles.list()
+ " absolute path:" + dirEffectFiles.getAbsolutePath() + " is absolute:" + dirEffectFiles.isAbsolute());
我得到的上述输出是：
01-13 16:23:34.941：有关的一些详细信息 目录：路径=/sdcard/audio 可以读取： false 列表：null 绝对值 路径：/sdcard/audio 是绝对的：true
我有以下问题：
1. 如何使上述文件夹可读？通过设置dirEffectFiles.setReadable(true)？
2. 另外，请注意上面的path_to_media是/sdcard/audio/。打印时，最后一个“/”消失。这是某些内部解析的正常效果还是我应该担心？
非常欢迎任何帮助，
谢谢，
斯里拉姆。
I have a directory /sdcard/audio in the project. This directory contains some audio (wav) files.
Here is what I am trying to do:
1. Read from the directory.
2. Play the wav files.
The code I have written for accessing the directory is as follows:
String path_to_media = "/sdcard/audio/";
File dirEffectFiles = new File(path_to_media); //gets a handle to the directory of effect files.
Log.v(this.toString(), "Getting into path = " + path_to_media);
Log.v(this.toString(), "Some details about the directory: path = " + dirEffectFiles.getPath()
+ " Can read: " + dirEffectFiles.canRead() + " list:" + dirEffectFiles.list()
+ " absolute path:" + dirEffectFiles.getAbsolutePath() + " is absolute:" + dirEffectFiles.isAbsolute());
The output I get for the above is:
01-13 16:23:34.941: Some details about
the directory: path = /sdcard/audio
Can read: false list:null absolute
path:/sdcard/audio is absolute:true
I have the following questions:
1. How can I make the above folder readable? By setting dirEffectFiles.setReadable(true)?
2. Also, please note that path_to_media above is /sdcard/audio/. When it is printed, the last "/" disappears. Is that a normal effect of some internal parsing or should I be worried about that??
Any help is most welcome,
Thanks,
Sriram.
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您是否已向 AndroidManifest.xml 添加了正确的权限？
另外，明智的做法是使用环境方法来获取正确的 SD 卡路径：
此外，您从以下位置获得什么：
Have you added the right permission to AndroidManifest.xml?
Also, it is wise to use a the environment method to get the correct SD-card path:
Also, what do you get from:
上面提到的/sdcard/audio是在项目目录下创建的一个目录。这种做法是错误的。必须使用 adb 创建模拟 sdcard 的目录（在命令提示符 (windows) 中），如下所示：
adb shell mkdir /sdcard/audio- 这将在 sdcard/ 中创建 audio/ 子目录就是这样。您应该能够从挂载的 /sdcard 目录中读取文件。
@thoredge：感谢您的帮助。
/sdcard/audio referred to above was a directory made in the project directory. This approach is wrong. The directory for emulating the sdcard must be created using adb (in command prompt (windows))like so:
adb shell mkdir /sdcard/audio- this will create the audio/ sub-directory in sdcard/adb push "complete path of file name to be pushed" /sdcard/audio/file-nameThat's it. You should be able to read files from the mounted /sdcard directory.
@thoredge: thanks for your help.