android - Why app crashing? ListView with different views -
i try create listview settings page. first line edittext; 2-5 lines 2 texts.
so adapter class :
public class settingsadapter extends baseadapter { private static final int type_name = 0; private static final int type_setting = 1; private static final int type_max_count = 2; spmeditactionactivity context; layoutinflater inflater; arraylist data; settingsadapter(spmeditactionactivity _context) { context = _context; inflater = (layoutinflater) context.getsystemservice(context.layout_inflater_service); data = new arraylist(); for(int i=0;i<5;i++) data.add("hello"); } @override public int getitemviewtype(int position) { return position==0 ? type_name : type_setting; } @override public int getviewtypecount() { return type_max_count; } @override public int getcount() { return data.size(); } @override public object getitem(int position) { return data.get(position); } @override public long getitemid(int position) { return position; } // пункт списка @override public view getview(int position, view convertview, viewgroup parent) { int type = getitemviewtype(position); view view = convertview; if (view == null) { if(type == type_name) view = inflater.inflate(r.layout.editactionactivity_settings_name, parent, false); else view = inflater.inflate(r.layout.editactionactivity_setting, parent, false); } return view; } } activity:
public class spmeditactionactivity extends activity { final int start_time_dialog = 1; final int end_time_dialog = 2; //==============ui=============================================== private listview settings_listview ; private settingsadapter settings_adapter; private button save_button; private button cancel_button; //============================================================== //========ui listeners========================================== private onclicklistener save_button_listener = new onclicklistener() { public void onclick(view v) { save(); } }; private onclicklistener cancel_button_listener = new onclicklistener() { public void onclick(view v) { cancel(); } }; //============================================================== //============================================================== //=================lifecycle methods============================ @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_spmeditaction); save_button = (button) findviewbyid(r.id.editactionactivity_save_button); cancel_button= (button) findviewbyid(r.id.editactionactivity_cancel_button); settings_adapter = new settingsadapter(spmeditactionactivity.this); settings_listview.setadapter( settings_adapter ); save_button.setonclicklistener(save_button_listener); cancel_button.setonclicklistener(cancel_button_listener); } //============================================================== private void save(){ finish(); } private void cancel(){ finish(); } } and in activity, when set adapter
settings_adapter = new settingsadapter(this); settings_listview.setadapter( settings_adapter ); my app crashing nullpointerexception .
can explain me, doing wrong?
ps. use tutorial
logcat output :
04-18 15:59:19.982: e/androidruntime(24150): fatal exception: main 04-18 15:59:19.982: e/androidruntime(24150): java.lang.runtimeexception: unable start activity componentinfo{com.hemul.soundprofilemanager/com.hemul.soundprofilemanager.spmeditactionactivity}: java.lang.nullpointerexception 04-18 15:59:19.982: e/androidruntime(24150): @ android.app.activitythread.performlaunchactivity(activitythread.java:2059) 04-18 15:59:19.982: e/androidruntime(24150): @ android.app.activitythread.handlelaunchactivity(activitythread.java:2084) 04-18 15:59:19.982: e/androidruntime(24150): @ android.app.activitythread.access$600(activitythread.java:130) 04-18 15:59:19.982: e/androidruntime(24150): @ android.app.activitythread$h.handlemessage(activitythread.java:1195) 04-18 15:59:19.982: e/androidruntime(24150): @ android.os.handler.dispatchmessage(handler.java:99) 04-18 15:59:19.982: e/androidruntime(24150): @ android.os.looper.loop(looper.java:137) 04-18 15:59:19.982:e/androidruntime(24150): @ android.app.activitythread.main(activitythread.java:4745) 04-18 15:59:19.982: e/androidruntime(24150): @ java.lang.reflect.method.invokenative(native method) 04-18 15:59:19.982: e/androidruntime(24150): @ java.lang.reflect.method.invoke(method.java:511) 04-18 15:59:19.982: e/androidruntime(24150): @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:786) 04-18 15:59:19.982: e/androidruntime(24150): @ com.android.internal.os.zygoteinit.main(zygoteinit.java:553) 04-18 15:59:19.982: e/androidruntime(24150): @ dalvik.system.nativestart.main(native method) 04-18 15:59:19.982: e/androidruntime(24150): caused by: java.lang.nullpointerexception 04-18 15:59:19.982: e/androidruntime(24150): @ com.hemul.soundprofilemanager.spmeditactionactivity.oncreate(spmeditactionactivity.java:111) 04-18 15:59:19.982: e/androidruntime(24150): @ android.app.activity.performcreate(activity.java:5008) 04-18 15:59:19.982: e/androidruntime(24150): @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1079) 04-18 15:59:19.982: e/androidruntime(24150): @ android.app.activitythread.performlaunchactivity(activitythread.java:2023) 04-18 15:59:19.982: e/androidruntime(24150): ... 11 more
your settings_listview null, because haven't assigned reference in oncreate
get listview reference xml this
settings_listview=(listview)findviewbyid(r.id.yourlistview); <-- listview id in xml after setcontentview(r.layout.activity_spmeditaction);
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