How to create a directory in External SD in android application

Question

I want to create a directory on \"/mnt/extsd/MyFolder\" this path. while calling mkdir() it returns false.I inserted the sdcard on my tablet, got the external path as \"/mnt/ext

Answer 1

Add permission in Manifest file

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

  File sdDir = Environment.getExternalStorageDirectory();

Answer 2

final String PATH = Environment.getExternalStorageDirectory() + "/myfolder/";

if(!(new File(PATH)).exists()) 
new File(PATH).mkdirs();

include permission in manifest::

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

Answer 3

Do you have declared permission in Manifest.xml file?

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

Also I suggest you to not going for HardCoded path of /mnt/extsd/ Instead of it just use Environment.getExternalStorageDirectory().getPath().

Answer 4

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

I have two folders like extSdCard and sdcard in my samsung galaxy s3.

Use the below code to choose.

private String[] mFilePaths;

File storageDir = new File("/mnt/");
if(storageDir.isDirectory()){
    File[] dirList = storageDir.listFiles();
    for (int i = 0; i < dirList.length; i++)
    {
        mFilePaths[i] = dirList[i].getAbsolutePath();
        System.out.println("...................................."+mFilePaths[i]);
    }
}

File Dir;
if(android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED))//check if sd card is mounted
{
    Dir=new File(android.os.Environment.getExternalStorageDirectory(),"your folder name");

    if(!Dir.exists())// if directory is not here
        Dir.mkdirs() // make directory
}

Edit

To get the paths of internal and external storage. below code works on samsung galaxy s3.

String externalpath = new String();
String internalpath = new String();

public  void getExternalMounts() {
    Runtime runtime = Runtime.getRuntime();
    try
    {
        Process proc = runtime.exec("mount");
        InputStream is = proc.getInputStream();
        InputStreamReader isr = new InputStreamReader(is);
        String line;

        BufferedReader br = new BufferedReader(isr);
        while ((line = br.readLine()) != null) {
            if (line.contains("secure")) continue;
            if (line.contains("asec")) continue;

            if (line.contains("fat")) {//external card
                String columns[] = line.split(" ");
                if (columns != null && columns.length > 1) {
                    externalpath = externalpath.concat("*" + columns[1] + "n");
                }
            }
            else if (line.contains("fuse")) {//internal storage
                String columns[] = line.split(" ");
                if (columns != null && columns.length > 1) {
                    internalpath = internalpath.concat(columns[1] + "n");
                }
            }
        }
    }
    catch(Exception e)
    {
        e.printStackTrace();
    }
    System.out.println("Path  of sd card external............"+externalpath);
    System.out.println("Path  of internal memory............"+internalpath);
}

Now you can use the path os external storage to create a folder.

if(android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED))//check if sd card is mounted
{
    Dir=new File(externalpath,"your folder name");

    if(!Dir.exists())// if directory is not here
        Dir.mkdirs() // make directory
}