如何在android外部存储目录中创建文件夹？
如何在android外部存储目录中创建文件夹？
提问于 2014-07-16 20:47:47
我无法在android外部存储目录中创建文件夹。
我在载货单上加上了遗漏，
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />下面是我的代码：
String Path = Environment.getExternalStorageDirectory().getPath().toString()+ "/Shidhin/ShidhiImages";
System.out.println("Path : " +Path );
File FPath = new File(Path);
if (!FPath.exists()) {
if (!FPath.mkdir()) {
System.out.println("***Problem creating Image folder " +Path );
}
}回答 8
Stack Overflow用户
回答已采纳
发布于 2014-07-16 20:54:00
如下所示：
String folder_main = "NewFolder";
File f = new File(Environment.getExternalStorageDirectory(), folder_main);
if (!f.exists()) {
f.mkdirs();
}如果您想在其中创建另一个文件夹：
File f1 = new File(Environment.getExternalStorageDirectory() + "/" + folder_main, "product1");
if (!f1.exists()) {
f1.mkdirs();
}Stack Overflow用户
发布于 2014-07-16 20:51:06
mkdir和mkdirs之间的区别在于，mkdir不会创建不存在的父目录，而mkdirs会创建父目录，因此如果Shidhin不存在，mkdir将失败。此外，仅当创建了目录时，mkdir和mkdirs才返回true。如果该目录已经存在，则返回false
Stack Overflow用户
发布于 2020-02-27 00:39:17
现在不建议使用Environment.getExternalStorageDirectory()，因为API级别29，该选项使用：
Context.getExternalFilesDir()。
示例：
void createExternalStoragePrivateFile() {
// Create a path where we will place our private file on external
// storage.
File file = new File(getExternalFilesDir(null), "DemoFile.jpg");
try {
// Very simple code to copy a picture from the application's
// resource into the external file. Note that this code does
// no error checking, and assumes the picture is small (does not
// try to copy it in chunks). Note that if external storage is
// not currently mounted this will silently fail.
InputStream is = getResources().openRawResource(R.drawable.balloons);
OutputStream os = new FileOutputStream(file);
byte[] data = new byte[is.available()];
is.read(data);
os.write(data);
is.close();
os.close();
} catch (IOException e) {
// Unable to create file, likely because external storage is
// not currently mounted.
Log.w("ExternalStorage", "Error writing " + file, e);
}
}
void deleteExternalStoragePrivateFile() {
// Get path for the file on external storage. If external
// storage is not currently mounted this will fail.
File file = new File(getExternalFilesDir(null), "DemoFile.jpg");
file.delete();
}
boolean hasExternalStoragePrivateFile() {
// Get path for the file on external storage. If external
// storage is not currently mounted this will fail.
File file = new File(getExternalFilesDir(null), "DemoFile.jpg");
return file.exists();
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/24781213
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