Android – how do I write files in an external SD card instead of in device storage?

I tried this:

  public String getFilename() {
    File file = new File(Environment.getExternalStorageDirectory(), "Test2");
    if (!file.exists()) {
        file.mkdirs();
    }
    String uriSting = (file.getAbsolutePath() + "/" + "IMG_" + System.currentTimeMillis() + ".png");
    return uriSting;
}

I tried to change the second line to:

File file = new File("sdcard/Test2");

However, the directory is still created in the device storage rather than on the external SD card

resolvent:

You do not have permission to access removable storage

On Android 4.4, you have two main choices:

>Use all methods on the context. Use getexternalfilesdirs(), getexternalcachedirs() or getexternalmediadirs() (please note the plural). If they return 2 locations, the second and subsequent locations are locations on removable storage, and your application can read and write without any permission. > use action_ OPEN_ DOCUMENT and ACTION_ CREATE_ Document, which allows users to choose where to place some content. Users can select removable storage (or Google cloud hard disk), Drop@R_628_2419 @Or external storage or anything else). You end up with a URI, not a file system path. Use contentresolver to work with that URI to get streams for reading and writing