java - Hi, I am trying to figure out how to pass a string from one class to another -
sorry code. string trying pass contents. let me know if need more info
i new java making silly mistakes. have tried making different methods pass string no luck. if able string appear in edittextbox, great.
i'm new website; sorry if making rookie mistakes.
main class:
package com.app.david.booktracker; public class mainactivity extends appcompatactivity { static final string action_scan = "com.google.zxing.client.android.scan"; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); inittoolbar(); } @override public boolean oncreateoptionsmenu(menu menu) { // inflate menu; adds items action bar if present. getmenuinflater().inflate(r.menu.menu_main, menu); return true; } public void inittoolbar() { toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar); toolbar.settitle("book tracker"); setsupportactionbar(toolbar); } public void newbook(view view) { intent intent = new intent(this, newbook.class); startactivity(intent); } public void showlistbook(view view) { intent intent = new intent(this, showallbooks.class); startactivity(intent); } public void scanbar(view v) { try { intent intent = new intent(action_scan); intent.putextra("scan_mode", "product_mode"); startactivityforresult(intent, 0); } catch (activitynotfoundexception e) { showdialog(mainactivity.this, "no scanner found", "download scanner code activity?", "yes", "no").show(); } } private static alertdialog showdialog(final appcompatactivity act, charsequence title, charsequence message, charsequence buttonyes, charsequence buttonno) { alertdialog.builder dowloaddialog = new alertdialog.builder(act); dowloaddialog .settitle(title) .setmessage(message) .setpositivebutton(buttonyes, new dialoginterface.onclicklistener() { @override public void onclick(dialoginterface dialog, int which) { uri uri = uri.parse("market://search?q=pname:" + "com.google.zxing.client.android"); intent intent = new intent(intent.action_view, uri); try { act.startactivity(intent); } catch (activitynotfoundexception e) { } } }) .setnegativebutton(buttonno, new dialoginterface.onclicklistener() { @override public void onclick(dialoginterface dialog, int which) { } }); return dowloaddialog.show(); } @override protected void onactivityresult(int requestcode, int resultcode, intent intent) { if(requestcode == 0) { if(resultcode == result_ok) { string contents = intent.getstringextra("scan_result"); string format = intent.getstringextra("scan_result_format"); toast.maketext(this, "content:" + contents + " format:" + format, toast.length_long).show(); } } } @override public boolean onoptionsitemselected(menuitem item) { // handle action bar item clicks here. action bar // automatically handle clicks on home/up button, long // specify parent activity in androidmanifest.xml. int id = item.getitemid(); //noinspection simplifiableifstatement if (id == r.id.action_settings) { return true; } destination class:
package com.app.david.booktracker; public class newbook extends appcompatactivity { private final static string tag= "group4.newbook"; private edittext ean; @override protected void oncreate(bundle savedinstancestate){ super.oncreate(savedinstancestate); setcontentview(r.layout.new_book); //inittoolbar(); } @override public boolean oncreateoptionsmenu(menu menu) { // inflate menu; adds items action bar if present. getmenuinflater().inflate(r.menu.menu_main, menu); return true; } public void inittoolbar(){ toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar); toolbar.settitle("book tracker"); setsupportactionbar(toolbar); toolbar.setnavigationicon(r.drawable.ic_toolbar_arrow); toolbar.setnavigationonclicklistener( new view.onclicklistener() { @override public void onclick(view v) { intent intent = new intent(v.getcontext(), mainactivity.class); startactivity(intent); } } ); } public void newbook(view view) { //get intent intent=new intent(this, mainactivity.class); edittext edittextbtitle=(edittext) findviewbyid(r.id.edittextfirstname); edittext edittextbauthor=(edittext) findviewbyid(r.id.edittextsurname); string booktitle=edittextbtitle.gettext().tostring(); string bookauthor=edittextbauthor.gettext().tostring(); string contents = intent.getstringextra("scan_result"); dataholder.bookadded(booktitle, bookauthor, contents); log.d(tag, " added: " + booktitle + " " + bookauthor + " " + contents); toast.maketext(this, "book added! ", toast.length_long).show(); startactivity(intent); } }
if want able access attributes outside of class, preferred way initialise them private attributes , have "getter" methods. simple method this:
public static string getcontents () { return contents; } will work. however, you'd have initialise variable attribute of class, this:
private static string contents; which have declared outside of functions in class (ie. after public static class mainactivity extents appcombatactivity {). don't forget change line initialised string contents contents.
i can't notice, though, you're initialising string of same name in newbook class. you're trying plug in original contents? if so, you'd need do, provided you've done of above, call mainactivity.getcontents(), , should return string you're looking for.
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