quick cordova plugin to get android special folders path
cordova plugin add https://github.com/nicolasgrolleau/androidfoldersplugin
androidfoldersplugin.getDirectories(function(result){
//receive a json object containing all the folders
console.log("All the folders:"+JSON.stringify(result));
console.log("Download folder"+result["Download"]);
},
function(error){
alert("Error:"+error);
}
);