This Screenshot function in AndroidStudio works?

I'm running this function to try to print the device screen, and save the image to the internal device of the file. But nothing happens.

View v = getWindow().getDecorView().findViewById(R.id.activity_main);
        v.setDrawingCacheEnabled(true);
        Bitmap bitmap = Bitmap.createBitmap(v.getDrawingCache());
        v.setDrawingCacheEnabled(false);
        OutputStream out = null;
        File imageFile = new File("croqui-teste");
        try {
            out = new FileOutputStream(imageFile);
            bitmap.compress(Bitmap.CompressFormat.PNG, 90, out);
            out.flush();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
            } catch (Exception exc) {
            }
        }