I want to create a new directory inside the SD card programmatically and I want to delete that directory also. How can开发者_如何转开发 I do this?
To create a directory you can use the following code:
File dir = new File("path/to/your/directory");
try{
if(dir.mkdir()) {
System.out.println("Directory created");
} else {
System.out.println("Directory is not created");
}
}catch(Exception e){
e.printStackTrace();
}
To delete an empty directory, you can use this code:
boolean success = (new File("your/directory/name")).delete();
if (!success) {
System.out.println("Deletion failed!");
}
To delete a non-empty directory, you can use this code:
public static boolean deleteDir(File dir) {
if (dir.isDirectory()) {
String[] children = dir.list();
for (int i=0; i<children.length; i++) {
boolean success = deleteDir(new File(dir, children[i]));
if (!success) {
return false;
}
}
}
return dir.delete();
}
Maybe you also need this permission:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
This answer is also a good resource:
How to create directory automatically on SD card
to create a directory, you could use
File myDirectory = new File(Environment.getExternalStorageDirectory(), "dirName");
if(!myDirectory.exists()) {
myDirectory.mkdirs();
}
to delete it,
myDirectory.delete();
dont forget to add permission:
uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
mkdir() for
File directory = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/abcabcabc");
directory.mkdir();
mkdirs() for
File directory = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/Mani/abcxyz");
directory.mkdirs();
new File(Environment.getExternalStorageDirectory(), "DirName").mkdirs();
if you want to create root directory and subfolder under it
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/rootfoldername"+"/your sub folder name");
File dir=new File(root + "/rootfoldername"+"/your sub folder name");
myDir.mkdirs();
dir.mkdirs();
I have created directory and sub directory for my project like this..
File root = android.os.Environment.getExternalStorageDirectory();
File dir = new File (root.getAbsolutePath() + "/MP3 Music/"); //it is my root directory
File favourite = new File (root.getAbsolutePath() + "/MP3 Music/" + "Favourites"); // it is my sub folder directory .. it can vary..
try
{
if(dir.exists()==false)
{
dir.mkdirs();
}
/* else
{
// Toast.makeText(MainActivity.this, "Root Directory is already exists", Toast.LENGTH_LONG).show();
}*/
if(favourite.exists()==false)
{
favourite.mkdirs();
}
}
catch(Exception e){
e.printStackTrace();
}
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