android - How to open doc/xls/ppt/pdf/dwg in a App? -

i want open common file such doc/xls/ppt/pdf/dwg,but can't find view can this,common view open 1 or 2 type file.what third can me this. android :)

to open doc file can use follow

public class mainactivity extends activity {         @override       public void oncreate(bundle savedinstancestate) {        super.oncreate(savedinstancestate);        setcontentview(r.layout.activity_main);          button button = (button) findviewbyid(r.id.bpressme);          button.setonclicklistener(new onclicklistener() {         @override         public void onclick(view v) {            file file = new file(environment.getexternalstoragedirectory(),            "help desk voice flow.doc");            try {           if (file.exists()) {            uri path = uri.fromfile(file);            intent objintent = new intent(intent.action_view);            // replace "application/msword"            // "application/vnd.openxmlformats-officedocument.wordprocessingml.document"            // docx files            // objintent.setdataandtype(path,"application/msword");            objintent.setflags(intent.flag_activity_clear_top);            startactivity(objintent);           } else {            toast.maketext(mainactivity.this, "file notfound",              toast.length_short).show();           }          } catch (activitynotfoundexception e) {           toast.maketext(mainactivity.this,             "no viewer application found", toast.length_short)             .show();          } catch (exception e) {           e.printstacktrace();          }         }        });         }