how to save image to sdcard folder from array in android

public void SaveImage(){

BitmapDrawable btmpDr = (BitmapDrawable) mCollageImageView.getDrawable();
Bitmap bmp = btmpDr.getBitmap();
File direct = new File(Environment.getExternalStorageDirectory() + "/collage app image");

if (!direct.exists()) {
    File wallpaperDirectory = new File("/sdcard/collage app image/");
    wallpaperDirectory.mkdirs();
}
File f = null;
f = new File(direct, UUID.randomUUID().toString() + ".png");
if (f.exists()) {
    f.delete();
}
try {
    FileOutputStream out = new FileOutputStream(f);
    bmp.compress(Bitmap.CompressFormat.JPEG, 100, out);
    out.flush();
    out.close();
    Toast.makeText(getContext(), "Image is saved successfully.", Toast.LENGTH_SHORT).show();
} catch (Exception e) {
    e.printStackTrace();
}

}