android- create new file on sdcard not working, what am i doing wrong?

Question

I am working on an app for android that will create a new .txt file on the SDcard mounted to the phone. I am new to android programming but I wrote this code. And then I tested the app on a real phone(not emulator). I navigated to My Files>All files>SD memory card and the file that is supposed to be created is not there. What am I doing wrong and how to fix my error? Thanks in advance !

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    String filename = "filename.txt";
    File file = new File(Environment.getExternalStorageDirectory(), filename);
    FileOutputStream fos;
    byte[] data = new String("data to write to file").getBytes();
    try {
        fos = new FileOutputStream(file);
        fos.write(data);
        fos.flush();
        fos.close();
    } catch (FileNotFoundException e) {
        // handle exception
    } catch (IOException e) {
        // handle exception
    }

UPDATE !!!

I found the files created in the phone's memory for some reason. Why this happened and how to create them in the memory card instead?

Any errors? Did you set `android.permission.WRITE_EXTERNAL_STORAGE` in the manifest file? — Reimeus, Apr 10 '15 at 21:12
To get SD Card path, u'll need this kind of code https://stackoverflow.com/a/27197248/1397821 — M. Usman Khan, Aug 24 '18 at 03:56

score 0 · Answer 1 · answered Apr 10 '15 at 21:21

File extDir = getExternalFilesDir(null);
String path = extDir.getAbsolutePath();
File file = new File(extDir, "filename.txt");
if(checkExternalStorage()){
  String text ="writing into externanal storage";
  FileOutputStream fos;
        try {
            fos = new FileOutputStream(file);
            fos.write(text.getBytes());
            fos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
}
public boolean checkExternalStorage() {
    String state = Environment.getExternalStorageState();
    if (state.equals(Environment.MEDIA_MOUNTED)) {
        return true;
    }
    return false;
}

with this I got the files created in My Files>All files>Device storage>Android>data>package_name>files — omar saab, Apr 10 '15 at 21:50

score 0 · Answer 2 · answered Apr 10 '15 at 22:37

Ok, I think that this code do you want...

File sd = Environment.getExternalStorageDirectory();
File f = new File(sd.getAbsolutePath(), filename);

OutputStreamWriter fout = new OutputStreamWriter(new FileOutputStream(f));

fout.write("this is a test.");
fout.close();

I hope it works!

score 0 · Answer 3 · edited Jul 07 '15 at 22:20

0

To access the actual SD card use:

String path = Syst.env("SECONDARY_STORAGE");

edited Jul 07 '15 at 22:20

J Richard Snape

20,116
5
51
79

answered Jul 07 '15 at 16:00

Kat

11
2

android- create new file on sdcard not working, what am i doing wrong?

3 Answers3