How do I save files to external storage on Android (like san disk card)?

So the problem I'm facing is that I'm trying to save a .txt file to the Android memory stick, so when I try to run FileOutputStream.Write () it gives the following message:

  

/ mnt / media_rw / C4B3_13EE / Personal Folder / Documents / Textout.txt: open   failed: EACCES (Permission denied)

My Code :

FileOutputStream outputStream;
File file = new File("/mnt/media_rw/C4B3_13EE/Pasta Pessoal/Documentos/TextoSaída.txt");
try {
    outputStream = new FileOutputStream(file);
    outputStream.write(textView.getText().toString().getBytes());
    outputStream.close();
    Log.e("TAG", file.getAbsolutePath() + " Arquivo Criado");
} catch (IOException e) {
    Log.e("TAG", e.getMessage());
    e.printStackTrace();
}
MediaScannerConnection.scanFile(this,new String[] {file.getAbsolutePath()}, null, null);

I have already checked where there could be possible errors like:

• Lack of permission in manifest:

  ...
  <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.febatis.texto">
  
          <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
          <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
  
          <application
                  ...
          </application>
  </manifest>
  

• Do not request permission at runtime for read and write (Being called in the OnCreate () of my MainActivity:

  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
          if (!Settings.System.canWrite(this)) {
                  requestPermissions(new String[]{
                          Manifest.permission.WRITE_EXTERNAL_STORAGE,
                          Manifest.permission.READ_EXTERNAL_STORAGE
                  }, 0);
          }
  }
  

• Do not test on directory without file and with file with the same existing name.

  File file = new File("/mnt/media_rw/C4B3_13EE/Pasta Pessoal/Documentos/TextoSaída.txt");
  File file = new File("/mnt/media_rw/C4B3_13EE/Pasta Pessoal/Documentos")
  

(Works for reading)

File file = new File("storage/C4B3_13EE/Pasta Pessoal/Documentos/TextoSaída.txt");

Well, I do not know what I can do to get access to the Android external memory card.