java - upload file in webview android studio -

helo, trying upload file ore picture on 1 bottom in webpage using webview in android studio, can not chose file or picture.... code please, if can great... try did action 2 week, searching in different webpage , can not that..

private webview mwebview; final int select_photo = 1;     private string url = "http://xxx...";  private valuecallback<uri> muploadmessage; private final static int filechooser_resultcode=1;  @override protected void onactivityresult(int requestcode, int resultcode, intent intent) {     if (requestcode == filechooser_resultcode) {         if (null == muploadmessage) return;         uri result = intent == null || resultcode != result_ok ? null                 : intent.getdata();         muploadmessage.onreceivevalue(result);         muploadmessage = null;     } }  @override public void onbackpressed() {       finish(); }  @suppresslint("setjavascriptenabled") protected void oncreate(bundle savedinstancestate) {       super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_mostrar_laravel);     mwebview = (webview) findviewbyid(r.id.activity_main_webview_laravel);     webview webview = new webview(this);        websettings websettings = webview.getsettings();     webview.getsettings().setloadwithoverviewmode(true);     webview.getsettings().setjavascriptenabled(true);     websettings.setjavascriptenabled(true);     websettings.setallowfileaccess(true);     websettings.setallowcontentaccess(true);     websettings.setloadsimagesautomatically(true);     websettings.setsaveformdata(false);     websettings.setjavascriptenabled(true);     websettings.setsupportzoom(false);     webview.setwebchromeclient(new mostrar_laravel.mywebchromeclient());     websettings.setblocknetworkloads(false);      webview.setscrollbarstyle(webview.scrollbars_outside_overlay);     webview.setscrollbarfadingenabled(false);     webview.getsettings().setbuiltinzoomcontrols(true);     webview.getsettings().setpluginstate(websettings.pluginstate.on);     webview.getsettings().setallowfileaccess(true);     webview.getsettings().setsupportzoom(true);     webview.addjavascriptinterface(new mostrar_laravel.myjavascriptinterface(this), "android");     webview.getsettings().setbuiltinzoomcontrols(true);      setcontentview(webview);        final websettings settings = webview.getsettings();     settings.setjavascriptenabled(true);     webview.setwebviewclient(new webviewclient());     settings.setappcacheenabled(true);     settings.setbuiltinzoomcontrols(true);     settings.setpluginstate(websettings.pluginstate.on);      webview.setwebchromeclient(new webchromeclient());      cookiesyncmanager.createinstance(mostrar_laravel.this);     cookiemanager cookiemanager = cookiemanager.getinstance();     cookiemanager.removesessioncookie();     string cookiestring = "param=value";     cookiemanager.setcookie("xxx...", cookiestring);     cookiesyncmanager.getinstance().sync();      map<string, string> abc = new hashmap<string, string>();     abc.put("cookie", cookiestring);      webview.setwebchromeclient(new webchromeclient() {         public void onprogresschanged(webview view, int progress) {           }          //the undocumented magic method override         //eclipse swear @ if try put @override here         // android 3.0+         public void openfilechooser(valuecallback<uri> uploadmsg) {              muploadmessage = uploadmsg;             intent = new intent(intent.action_get_content);             i.addcategory(intent.category_openable);             i.settype("image/*");             startactivityforresult(intent.createchooser(i, "file chooser"), filechooser_resultcode);         }          // android 3.0+         public void openfilechooser(valuecallback uploadmsg, string accepttype) {             muploadmessage = uploadmsg;             intent = new intent(intent.action_get_content);             i.addcategory(intent.category_openable);             i.settype("*/*");             startactivityforresult(                     intent.createchooser(i, "file browser"),                     filechooser_resultcode);         }          //for android 4.1         public void openfilechooser(valuecallback<uri> uploadmsg, string accepttype, string capture) {             muploadmessage = uploadmsg;             intent = new intent(intent.action_get_content);             i.addcategory(intent.category_openable);             i.settype("image/*");             startactivityforresult(intent.createchooser(i, "file chooser"), filechooser_resultcode);          }       });        webview.loadurl(url,abc);        this.mwebview.setwebviewclient(new webviewclient(){          public void onreceivederror(webview view, int errorcode, string description, string failingurl) {              mwebview.loadurl("about:blank");              view.clearhistory();         }         @override         public boolean shouldoverrideurlloading(webview view, string url){             view.loadurl(url);             return true;         }     }); }  final class mywebchromeclient extends webchromeclient {     @override     public boolean onjsalert(webview view, string url, string message, jsresult result) {         result.confirm();         return true;     }     public void openfilechooser(valuecallback<uri> uploadmsg) {          muploadmessage = uploadmsg;         intent = new intent(intent.action_get_content);         i.addcategory(intent.category_openable);         i.settype("image/*");         mostrar_laravel.this.startactivityforresult(                 intent.createchooser(i, "image browser"),                 filechooser_resultcode);     } }   class myjavascriptinterface {      context mcontext;       myjavascriptinterface(context c)     {         mcontext = c;     }       @javascriptinterface     public void showtoast(string toast)     {         toast.maketext(mcontext, toast, toast.length_short).show();     }      @javascriptinterface     public string choosephoto()     {         // todo auto-generated method stub         string file = "test";         intent photopickerintent = new intent(intent.action_pick);         photopickerintent.settype("image/*");         startactivityforresult(photopickerintent, select_photo);         return file;     }     @javascriptinterface     public void openandroiddialog() {         alertdialog.builder mydialog                 = new alertdialog.builder(mostrar_laravel.this);         mydialog.settitle("danger!");         mydialog.setmessage("you can want!");         mydialog.setpositivebutton("on", null);         mydialog.show();     } }  public string getrealpathfromuri(context context, uri contenturi) {     cursor cursor = null;     try     {         string[] proj = { mediastore.images.media.data };         cursor = context.getcontentresolver().query(contenturi, proj, null, null, null);         int column_index = cursor.getcolumnindexorthrow(mediastore.images.media.data);         cursor.movetofirst();         return cursor.getstring(column_index);     }         {         if (cursor != null)         {             cursor.close();         }     } }