how to create a folder in android External Storage Directory?

问题

I cannot create a folder in android External Storage Directory.

I have added permissing on manifest,

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Here is my code:

 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1:

Do it like this :

String folder_main = "NewFolder";

File f = new File(Environment.getExternalStorageDirectory(), folder_main);
if (!f.exists()) {
    f.mkdirs();
}

If you wanna create another folder into that :

File f1 = new File(Environment.getExternalStorageDirectory() + "/" + folder_main, "product1");
if (!f1.exists()) {
    f1.mkdirs();
}

回答2:

The difference between mkdir and mkdirs is that mkdir does not create nonexistent parent directory, while mkdirs does, so if Shidhin does not exist, mkdir will fail. Also, mkdir and mkdirs returns true only if the directory was created. If the directory already exists they return false

回答3:

I can create a folder in android External Storage Directory.

I have added permissing on manifest,

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Here is my code:

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(); // This will create a Folder
inerDire.createNewFile(); // This will create File (For E.g .jpg
file)

回答4:

we can Create Folder or Directory on External storage as :

 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();
}

and if we want to create Directory or folder on Internal Memory then we will do :

File folder = getFilesDir(); 
File f= new File(folder, "doc_download"); 
f.mkdir();

But make Sure you have given Write External Storage Permission. And Remember that if you have no external drive then it choose by default to internal parent directory. I'm Sure it will work .....enjoy code

回答5:

Try adding

FPath.mkdirs(); (See http://developer.android.com/reference/java/io/File.html)

and then just save the file as needed to that path, Android OS will create all the directories needed. You don't need to do the exists checks, just set that flag and save. (Also see : How to create directory automatically on SD card

回答6:

try {

String filename = "SampleFile.txt"; String filepath = "MyFileStorage";

                FileInputStream fis = new FileInputStream(myExternalFile);
                DataInputStream in = new DataInputStream(fis);
                BufferedReader br =
                        new BufferedReader(new InputStreamReader(in));
                String strLine;
                while ((strLine = br.readLine()) != null) {
                    myData = myData + strLine;
                }
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
          inputText.setText(myData);
            response.setText("SampleFile.txt data retrieved from External Storage...");
        }
    });

    if (!isExternalStorageAvailable() || isExternalStorageReadOnly()) {
        saveButton.setEnabled(false);
    }
    else {
        myExternalFile = new File(getExternalFilesDir(filepath), filename);
    }

来源：https://stackoverflow.com/questions/24781213/how-to-create-a-folder-in-android-external-storage-directory

标签

android