java - How to write files to external public storage in Android so that they are visible from Windows? -

my app should save files place where, when connect phone/tablet computer, can see them through system file explorer.

this way implemented file writing:

protected string mdir = environment.directory_documents; protected file mpath = environment.getexternalstoragepublicdirectory(mdir);  protected void writelogfile(string filename) {     file f = new file(mpath, filename + ".txt");     f.getparentfile().mkdirs();     try (bufferedwriter bw = new bufferedwriter(new filewriter(f, false))) {          // details omitted.      } catch (exception e) {         e.printstacktrace();         return;     }     maketext("wrote " + f.getabsolutepath()); } 

this see when connect sony xperia z4 tablet windows (notice missing documents folder):

this directory file written (using above implementation):

what wrong implementation?

what wrong implementation?

mediastore has not discovered newly-created files yet. see in windows — , in many on-device "gallery" apps — based on mediastore has indexed.

use mediascannerconnection , scanfile() method tell mediastore file, once have written out data disk:

public void scanfile(context ctxt, file f, string mimetype) {     mediascannerconnection         .scanfile(ctxt, new string[] {f.getabsolutepath()},                   new string[] {mimetype}, null); }