我无法在安卓外部存储目录中创建文件夹。
我在清单文件中添加了权限，
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
这是我的代码：
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 );
}
}
像这样做：
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();
}
getExternalFilesDir将被清除。那么，有哪些其他方法呢？ - TheRealChx101mkdir和mkdirs的区别在于，mkdir不会创建不存在的父目录，而mkdirs会，所以如果Shidhin不存在，mkdir将失败。此外，mkdir和mkdirs仅在目录被创建时返回true。如果目录已经存在，则返回false。
getexternalstoragedirectory() 已经被弃用。我找到了解决方法，对你可能有帮助。（这是2021年6月的解决方案）
适用于包括Api 30、Android 11的系统：
现在，使用commonDocumentDirPath来保存文件。
步骤1：
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
步骤：2
public static File commonDocumentDirPath(String FolderName){
File dir = null ;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
dir = new File (Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS)+ "/"+FolderName );
} else {
dir = new File(Environment.getExternalStorageDirectory() + "/"+FolderName);
}
return dir ;
}
在API Level 29及以上版本中，使用Environment.getExternalStorageDirectory()的方法已经被弃用，可以使用以下选项：
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();
}
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
这是我的代码：
String folder_main = "Images";
File outerFolder = new File(Environment.getExternalStorageDirectory(), folder_main);
File inerDire = new File(outerFolder.getAbsoluteFile(), System.currentTimeMillis() + ".jpg");
if (!outerFolder.exists()) {
outerFolder.mkdirs();
}
if (!outerFolder.exists()) {
inerDire.createNewFile();
}
outerFolder.mkdirs(); // 这将创建一个文件夹
inerDire.createNewFile(); // 这将创建一个文件（例如 .jpg 文件）
String myfolder=Environment.getExternalStorageDirectory()+"/"+fname;
File f=new File(myfolder);
if(!f.exists())
if(!f.mkdir()){
Toast.makeText(this, myfolder+" can't be created.", Toast.LENGTH_SHORT).show();
}
else
Toast.makeText(this, myfolder+" can be created.", Toast.LENGTH_SHORT).show();
}
如果我们想在内部存储器上创建目录或文件夹，我们可以执行以下操作：
File folder = getFilesDir();
File f= new File(folder, "doc_download");
f.mkdir();
但请确保您已授予写入外部存储权限。同时请记住，如果您没有外部驱动器，则默认选择内部父目录。我相信它会起作用.....享受编程吧
File folder = getExternalFilesDir("yourfolder");
//create folder Internal
File file = new File(Environment.getExternalStorageDirectory().getPath( ) + "/RICKYH");
if (!file.exists()) {
file.mkdirs();
Toast.makeText(MainActivity.this, "Make Dir", Toast.LENGTH_SHORT).show();
}
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
private String createFolder(Context context, String folderName) {
//getting app directory
final File externalFileDir = context.getExternalFilesDir(null);
//creating new folder instance
File createdDir = new File(externalFileDir.getAbsoluteFile(),folderName);
if(!createdDir.exists()){
//making new directory if it doesn't exist already
createdDir.mkdir();
}
return finalDir.getAbsolutePath() + "/" + System.currentTimeMillis() + ".txt";
}
尝试添加
FPath.mkdirs(); (请参见http://developer.android.com/reference/java/io/File.html)
然后将文件保存到该路径，Android操作系统将创建所有所需的目录。 您不需要进行存在性检查，只需设置该标志并保存即可。 （还请参阅：如何在SD卡上自动创建目录）
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"/>