how to create folder in internal storage in android studio for andoidx?

Question

how to create folder in internal storage in android studio and works in all android versions till android Q.

Answer 1

AndroidManifest.xml

add Permission in manifest file

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

add request legacy external storage for application

<application
            android:requestLegacyExternalStorage="true">
</application>

MainActivity.this

add this code MainActivity.this file

File f = new File(Environment.getExternalStorageDirectory(), "My folder");
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            try {
               Files.createDirectory(Paths.get(f.getAbsolutePath()));
            } catch (IOException e) {
                e.printStackTrace();
                Toast.makeText(getApplicationContext(), e.getLocalizedMessage(), Toast.LENGTH_LONG).show();
            }
        } else {
            f.mkdir();
            f.mkdirs();
            Toast.makeText(getApplicationContext(), f.getPath(), Toast.LENGTH_LONG).show();
        }