android - Custom Adapter - Listview setBackground current row -


first of all, i'm trying achieve is: whenever person clicks specific button (this button on every line of listview rows), the row according button should change color.

this i've tried far without success, because gives me errors.

public view getview(int position, view convertview, viewgroup parent) {      layoutinflater inflater = (layoutinflater) context.getsystemservice(context.layout_inflater_service);     view rowview = inflater.inflate(rowresourceid, parent, false);      imagebutton add_to_cart = (imagebutton) rowview.findviewbyid(r.id.add_to_cart_butt);     final listview lv = (listview) rowview.findviewbyid(r.id.product_listview);     final int theposition = position;      add_to_cart.setclickable(true);     add_to_cart.setid(position);       add_to_cart.setonclicklistener(new onclicklistener() {          @override         public void onclick(view v) {             lv.setfocusable(true); // line error begins             lv.setbackgroundcolor(color.green);                  }     });  10-06 15:56:19.302: e/androidruntime(1859): fatal exception: main 10-06 15:56:19.302: e/androidruntime(1859): java.lang.nullpointerexception 10-06 15:56:19.302: e/androidruntime(1859):     @ classes.com.example.myexample.itemadapter$1.onclick(itemadapter.java:66) 10-06 15:56:19.302: e/androidruntime(1859):     @ android.view.view.performclick(view.java:4240) 10-06 15:56:19.302: e/androidruntime(1859):     @ android.view.view$performclick.run(view.java:17721) 10-06 15:56:19.302: e/androidruntime(1859):     @ android.os.handler.handlecallback(handler.java:730) 10-06 15:56:19.302: e/androidruntime(1859):     @ android.os.handler.dispatchmessage(handler.java:92) 10-06 15:56:19.302: e/androidruntime(1859):     @ android.os.looper.loop(looper.java:137) 10-06 15:56:19.302: e/androidruntime(1859):     @ android.app.activitythread.main(activitythread.java:5103) 10-06 15:56:19.302: e/androidruntime(1859):     @ java.lang.reflect.method.invokenative(native method) 10-06 15:56:19.302: e/androidruntime(1859):     @ java.lang.reflect.method.invoke(method.java:525) 10-06 15:56:19.302: e/androidruntime(1859):     @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:737) 10-06 15:56:19.302: e/androidruntime(1859):     @ com.android.internal.os.zygoteinit.main(zygoteinit.java:553) 10-06 15:56:19.302: e/androidruntime(1859):     @ dalvik.system.nativestart.main(native method)

how can solve it? thanks.

just change color of rowview. or edit tag of rowview , n make if(rowview.gettag().equals("clicked"){//changeback}else{//defaultback}


Comments

Post a Comment

Popular posts from this blog

java.util.scanner - How to read and add only numbers to array from a text file -

i'm learning java , have question regarding reading file want read numbers file contains strings well. here example of file: 66.56 "3 java 3-43 5-42 2.1 1 and here coding: public class test { public static void main (string [] args){ if (0 < args.length) { file x = new file(args[0]); try{ scanner in = new scanner( new fileinputstream(x)); arraylist<double> test = new arraylist<>(); while(in.hasnext()){ if(in.hasnextdouble()){ double f=in.nextdouble(); test.add(f);} else {in.next();} } catch(ioexception e) { system.err.println("exception during reading: " + e); } } my problem add 66.56,2.1 , 1 doesn't add 3 after "3 or ignores 3-43 , 5-42 can tell me how skip strings , add doubles here? thanks all said 3 ie; "3, 3-43 , 4-42 strings either u read string , split , check number @ " , - or put in space between characters , integers. jvm after compilation tre...
Read more

rewrite - Trouble with Wordpress multiple custom querystrings -

i'm working on adding multiple querystring , doesn't seem work. i've found codes seems work others might i'm missing something. i want like: http://mydomain.com/board/?getyear=2013&getsometext2=sometext to http://mydomain.com/board/2013/sometext/ i added code below functions.php file. doesn't seem work should though. this works. echoing querystring gets both variable without problem. http://mydomain.com/board/2013/sometext/ but doesn't. tested querystring vis isset() seems nothing being set/get http://mydomain.com/board/2013/ function add_query_vars($vars) { $vars[] = "getyear"; $vars[] = "getsometext2"; return $vars; } add_filter('query_vars', 'add_query_vars'); function add_rewrite_rules($arules) { $anewrules = array('board/([^/]+)/([^/]+)/?$' => 'index.php?pagename=board&getyear=$matches[1]&getsometext2=$matches[2]'); $arules = $a...
Read more