Issue creating a file in android

Question

I am trying to create a file inside a directory using the following code:

ContextWrapper cw = new ContextWrapper(getApplicationContext()); File directory = cw.getDir("themes", Context.MODE_WORLD_WRITEABLE); Log.d("Create File", "Directory path"+directory.getAbsolutePath()); File new_file =new File(directory.getAbsolutePath() + File.separator + "new_file.png"); Log.d("Create File", "File exists?"+new_file.exists());

When I check the file system of emulator from eclipse DDMS, I can see a directory "app_themes" created. But inside that I cannot see the "new_file.png" . Log says that new_file does not exist. Can someone please let me know what the issue is?

Regards, Anees

user370305 · Accepted Answer · 2012-03-14 06:55:12Z

Try this,

File new_file =new File(directory.getAbsolutePath() + File.separator + "new_file.png"); try { new_file.createNewFile(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } Log.d("Create File", "File exists?"+new_file.exists());

But be sure,

public boolean createNewFile ()

Creates a new, empty file on the file system according to the path information stored in this file. This method returns true if it creates a file, false if the file already existed. Note that it returns false even if the file is not a file (because it's a directory, say).

jabu.10245 · Accepted Answer · 2012-03-14 06:58:19Z

Creating a File instance doesn't necessarily mean that file exists. You have to write something into the file to create it physically.

File directory = ... File file = new File(directory, "new_file.png"); Log.d("Create File", "File exists? " + file.exists()); // false byte[] content = ... FileOutputStream out = null; try { out = new FileOutputStream(file); out.write(content); out.flush(); // will create the file physically. } catch (IOException e) { Log.w("Create File", "Failed to write into " + file.getName()); } finally { if (out != null) { try { out.close(); } catch (IOException e) { } } }

Or, if you want to create an empty file, you could just call

file.createNewFile();

Khasm · Accepted Answer · 2012-03-14 06:57:26Z

Creating a File object doesn't mean the file will be created. You could call new_file.createNewFile() if you wanted to create an empty file. Or you could write something to it.

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