Unable to create directory in Android Error -

i trying download file server , store in storage code gives error - unable create directory. please check error

task - file gets downloaded server , loaded in webview in android.

protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);     webview = (webview) findviewbyid(r.id.webview);     try {         webview.loadurl("file://" + environment.getexternalstoragedirectory() + "/sponsors/"+ "dddd.html");     }     catch (exception e)     {         toast.maketext(mainactivity.this, "file doesn't exist", toast.length_short).show();     }     try {         mydownloadlast("http://192.168.76.1:8084/mytest/dddd.html");     }     catch (exception e)     {         toast.maketext(this, e.getmessage()+"\n"+e.getcause(), toast.length_short).show();     } } public void mydownloadlast(string myurl) {      downloadmanager.request request = new downloadmanager.request(uri.parse(myurl));     request.settitle("updating timetable");     request.setdescription("please wait");      //request.setallowednetworktypes(downloadmanager.request.network_wifi);     request.allowscanningbymediascanner();     request.setnotificationvisibility(downloadmanager.request.visibility_visible_notify_completed);     //request.setnotificationvisibility(downloadmanager.request.visibility_hidden);     string nameoffile = urlutil.guessfilename(myurl, null, mimetypemap.getfileextensionfromurl(myurl));      file myfile = new file(string.valueof(environment.getexternalstoragepublicdirectory("/sponsors/")));     if(!myfile.exists()){         myfile.mkdir();     }     try {         request.setdestinationinexternalpublicdir(string.valueof(myfile), nameoffile);     }     catch (exception e)     {         toast.maketext(this, e.getmessage()+"\n"+e.getcause(), toast.length_short).show();     }     downloadmanager manager = (downloadmanager) getsystemservice(context.download_service);     manager.enqueue(request);     broadcastreceiver oncomplete = new broadcastreceiver() {         public void onreceive(context ctxt, intent intent) {             //toast.maketext(getactivity(), "download complete", toast.length_long).show();             toast.maketext(getapplicationcontext(), "update complete\nfor best performance\nrestart app", toast.length_short).show();         }     };     registerreceiver(oncomplete, new intentfilter(downloadmanager.action_download_complete)); } 

your problem can related few suspects

make sure have permissions on android manifest

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

also, refer external directory following :

string name = environment.getexternalstoragedirectory().getabsolutepath() + "/directorynameyouwant/" ;