This is a simple dialog to allow a user to choose a file folder.
See also Sample File Picker
//Called when application is started function OnStart(){ //Create a layout with objects vertically centered. lay = app.CreateLayout( "linear", "Vertical,FillXY" ); //Create a text label and add it to layout. btn = app.CreateButton( "FolderPicker demo" ); lay.AddChild( btn ); btn.SetOnTouch(btn_OnTouch); //Add layout to app. app.AddLayout( lay ); pick = new FolderPicker(mycallback); // don't show hidden files pick.SetHideFiles(true); }//function Onstart() function btn_OnTouch(){ pick.SetFolder("/sdcard"); pick.Show(); }//function btn_OnTouch() function mycallback(fullpath){ app.Alert("user chose " + fullpath) }//function mycallback() function FolderPicker(Callback,basePath){ var self = this; this.basePath = basePath || "/sdcard"; this.callback = Callback || function(){}; this.FolderPath = this.basePath; this.hideHiddenFiles = false; this.dlg = app.CreateDialog(this.basePath); this.lay = app.CreateLayout( "linear", "horizontal,fillxy" ); this.lstFolds = app.CreateList("blank" , 0.7, 0.7 ); this.lstFolds.parent = self; this.lstFolds.SetOnTouch(FolderPicker_NewFolder); this.lay.AddChild(this.lstFolds); var vlay = app.CreateLayout( "linear", "vertical,fillxy" ); this.okBtn = app.CreateButton("Ok"); this.okBtn.parent = self; this.okBtn.SetOnTouch(FolderPicker_Select); vlay.AddChild(this.okBtn); this.cancelBtn = app.CreateButton("Cancel"); this.cancelBtn.parent = self; this.cancelBtn.SetOnTouch(FolderPicker_Select); vlay.AddChild(this.cancelBtn); this.lay.AddChild(vlay) this.dlg.AddLayout(this.lay); this.Show = function(){ self.dlg.Show(); } this.SetHideFiles=function(val){ if(val == undefined) val = true; self.hideHiddenFiles = val; } this.Hide = function(){ self.dlg.Hide(); } this.GetFolder = function(){ return self.FolderPath; } this.SetFolder = function(folderPath){ self.FolderPath = folderPath; self.dlg.SetTitle(folderPath); app.ShowProgress( "Loading..." ); var lst = app.ListFolder(folderPath); lst.sort(function(x,y){return (x.toLowerCase() > y.toLowerCase())?1:-1}); self.lstFolds.SetList(""); if( self.FolderPath != self.basePath ) self.lstFolds.AddItem("..",null,"folder"); var ths = lst.shift(); while (undefined != ths) { if ((! self.hideHiddenFiles) || (ths.indexOf(".") != 0)){ var pth = folderPath + "/" + ths; if (app.IsFolder(pth)) self.lstFolds.AddItem(ths,null,"folder") } ths = lst.shift(); } app.HideProgress(); } }//function FolderPicker() function FolderPicker_NewFolder(fil){ var par = this.parent; var pth = par.GetFolder(); if (fil != "..") { pth += "/" + fil } else{ if( pth == par.basePath || pth == "/" ){ par.Hide() return; } var tst = pth.split("/"); tmp = tst.pop(); pth = (tst.join("/")); } par.SetFolder(pth); }//function FolderPicker_NewFolder() function FolderPicker_Select(fil){ var par = this.parent; var pth = par.GetFolder(); par.Hide(); if(this.GetText() == "Ok") par.callback(pth ); }//function FolderPicker_Select()