如果 Android 目录不存在，如何自动创建它
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/25202977/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to create Android directory automatically if it doesn't already exist
提问by user3739970
I am creating a gallery app using a tutorial but get the following error:
我正在使用教程创建图库应用程序，但出现以下错误：
abc directory path is not valid! Please set the image directory name AppConstant.java class
abc 目录路径无效！请设置图片目录名 AppConstant.java 类
Please visit the following link to see the entire tutorial's code as I am using the same code:
请访问以下链接以查看整个教程的代码，因为我使用的是相同的代码：
I found this code in UtilsClass:
我在UtilsClass 中找到了这段代码：
else { // image directory is empty Toast.makeText( _context, AppConstant.PHOTO_ALBUM + " is empty. Please load some images in it !", Toast.LENGTH_LONG).show(); }
else { // 图片目录为空 Toast.makeText( _context, AppConstant.PHOTO_ALBUM + " 为空。请在其中加载一些图片！", Toast.LENGTH_LONG).show(); }
} else {
AlertDialog.Builder alert = new AlertDialog.Builder(_context);
alert.setTitle("Error!");
alert.setMessage(AppConstant.PHOTO_ALBUM
+ " directory path is not valid! Please set the image directory name AppConstant.java class");
alert.setPositiveButton("OK", null);
alert.show();
}
return filePaths;
How can I create the missing directory programmatically instead of display this error dialog?
如何以编程方式创建丢失的目录而不是显示此错误对话框？
回答by Simas
Here's how you create directories if they don't exist. Considering that directoryis indeed a directory.
如果目录不存在，请按照以下方法创建目录。考虑到这directory确实是一个目录。
// If the parent dir doesn't exist, create it
if (!directory.exists()) {
if (parentDir.mkdirs()) {
Log.d(TAG, "Successfully created the parent dir:" + parentDir.getName());
} else {
Log.d(TAG, "Failed to create the parent dir:" + parentDir.getName());
}
}
mkdirs()will also create missing parent directories (i.e. all directories that lead to directory).
mkdirs()还将创建缺少的父目录（即所有指向 的目录directory）。
