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W1ll
Asked: 2020-11-30 14:15:26 +0800 CST 2020-11-30 14:15:26 +0800 CST

How to create a directory and save a txt file in the external SD memory

  • 772

I am making an app in which I am trying to create the "Download/Datax" directory and write txt files to the external SD memory and I am using this code:

File directorioExt = new File( Environment.getExternalStoragePublicDirectory( Environment.DIRECTORY_DOCUMENTS ), "/Download/Datax/" );
if (!directorioExt.exists()) {
   File directoriox = new File( Environment.getExternalStorageDirectory() + "/Download/Datax/" );
   directoriox.mkdirs();
   }

But the directory cannot be created in external memory. I have also placed in the manifest:

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

Can someone tell me how to achieve this?

android

1 Answers

  1. Best Answer

    Actually your code is correct:

    File directorioExt = new File( Environment.getExternalStoragePublicDirectory( Environment.DIRECTORY_DOCUMENTS ), "/Download/Datax/" );
if (!directorioExt.exists()) {
   File directoriox = new File( Environment.getExternalStorageDirectory() + "/Download/Datax/" );
   directoriox.mkdirs();
}

    One of the reasons why you could not create the specified directory is not having the permission WRITE_EXTERNAL_STORAGE, for devices with Android 6.0 operating system it is not enough to define it in the file AndroidManifest.xml, you must request it manually:

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
    //Verifica permisos para Android 6.0+
    int permissionCheck = ContextCompat.checkSelfPermission(
            this, Manifest.permission.WRITE_EXTERNAL_STORAGE);
    if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
        Log.i("Mensaje", "No se tiene permiso para leer.");
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 225);
    } else {
        Log.i("Mensaje", "Se tiene permiso para leer!");
    }
}

    Check this answer:

    Error displaying external file directory in an AlertDialog in android 6.0 (READ_EXTERNAL_STORAGE / WRITE_EXTERNAL_STORAGE )

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