java 如何在Android中创建目录？
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How to create a directory in Android?
提问by Dimitri
Everything is in the question. Here is my code :
一切都在问题中。这是我的代码：
private void createDirectory(File currentDirectory) {
File f = null;
try {
f = new File(currentDirectory.getCanonicalPath() + "/directory"
+ count);
boolean success = f.mkdir();
if (!success) {
Toast.makeText(currentContext,
f.getName() + " could not be created", 15).show();
}
} catch (IOException ioe) {
Toast.makeText(currentContext,
f.getName() + " could not be created", 15).show();
}
count++;
}
I am writing a small file manager in Android and I would like to add the possibility to create a directory. There is no exception and the variable success always return false. Can someone tell me what is wrong my code??
我正在 Android 中编写一个小文件管理器，我想添加创建目录的可能性。没有例外，变量成功总是返回假。有人能告诉我我的代码有什么问题吗？？
Thx for your advice !!
谢谢你的建议！！
[EDIT]
[编辑]
BTW, When the phone is in Developpement mode, does an application has a write access on the sdcard? I am programming on my phone (Acer liquid)
顺便说一句，当手机处于开发模式时，应用程序是否具有对 SD 卡的写访问权限？我正在我的手机上编程（宏基液体）
回答by Cristian
You have to add this permission:
您必须添加此权限：
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
By the way, not sure how you are getting the SDcard directory... but it must be this way:
顺便说一句，不确定您是如何获取 SDcard 目录的……但它必须是这样的：
File sdDir = Environment.getExternalStorageDirectory();
It's important, because some programmers use to think that the SDCard is always /sdcard, but it could change.
这很重要，因为有些程序员过去认为 SDCard 总是 /sdcard，但它可能会改变。
回答by AaronM
You're going to need to add
你需要添加
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
to your manifest file to tell Android to ask the user for your application to be allowed to.
到您的清单文件，告诉 Android 要求用户允许您的应用程序。
回答by CommonsWare
First, please use the Fileconstructor that takes a Filefor your directory and a Stringfor your desired subdirectory.
首先，请使用为您的目录使用FileaFile并String为您想要的子目录使用 a 的构造函数。
Beyond that, most likely you are attempting to create a directory where you are not allowed, either because:
除此之外，很可能您正在尝试创建一个不允许的目录，原因可能是：
currentDirectorydoes not exist, orcurrentDirectorypoints to a place on the on-board flash storage where you are not allowed to write, orcurrentDirectorypoints to a place on the external storage and you lack theWRITE_EXTERNAL_STORAGEpermission
currentDirectory不存在，或currentDirectory指向板载闪存上不允许写入的位置，或currentDirectory指向外部存储上的一个位置，但您没有WRITE_EXTERNAL_STORAGE权限
回答by tony gil
instead of boolean success = f.mkdir();use
而不是boolean success = f.mkdir();使用
boolean success = f.mkdirs();
that solved my problem (i used the same reference code as you and had the same issue).
这解决了我的问题（我使用了与您相同的参考代码并且遇到了同样的问题）。
