android - Get child view inside a Listview Adapter -

-

inside getview method want specific child view. know adapter holds several items, doing calling getcount:

getcount();

according javadoc: 

public abstract int getcount ()  added in api level 1 how many items in data set represented adapter.

now in getview method:

public view getview(final int position, view convertview, viewgroup parent) {     view lastaddeditem = parent.getchildat(getcount()-1);    if(lastaddeditem == null)  {      log.w("listadapter", "view null");    }  }

this message appears in logcat, means view try grab null.

i've tried this:

view lastaddeditem = parent.getchildat(parent.getchildcount()-1);

so how can grab specific view viewgroup object?

i know adapter holds several items, doing calling getcount:

yes does, getcount()(returning items in adapter) method of adapter has nothing getting children of listview getchildat()(where should use getchildcount() return views present in viewgroup).

lastaddeditem = parent.getchildat(parent.getchildcount()-1);

this should return non-null view, last view returned getview() method.

i want animate specific view in viewgroup

if going animate list row(or part of row) when becomes visible register scroll listener listview , start animation there when target view appearing on screen.


Comments

Post a Comment

Popular posts from this blog

Capture and play voice with Asterisk ARI -

-
there channel ari demo in wich can control channel state: ring, answer, play silence, play tone or audio-file ( https://github.com/asterisk/ari-examples/tree/master/channel-state , https://wiki.asterisk.org/wiki/display/ast/ari+and+channels%3a+manipulating+channel+state ) possible receive chunks (parts, buffers, etc.) of call voice (which created remote subscriber) or write chunks of voice, example array of bytes (not file) in audio format (alaw, ulow etc). you can use asterisk eagi interface voice data. other option use record or mixmonitor app record channel(channel have put stasis allow dialplan control ari) "write chunks of voice" can done application playback also can create own application using c/c++, compile asterisk , result want. no, can't redirect voice directly using ari.
Read more

c - Unrecognised emulation mode: elf_i386 on MinGW32 -

-
i'm trying make kernel, , cannot link c output assembly. ld . i'm getting error: unrecognized emulation mode: elf_i386 i'm using windows 10 professional mingw32 , msys. code using: link.ld /* * link.ld */ output_format(elf32-i386) entry(start) sections { . = 0x100000; .text : { *(.text) } .data : { *(.data) } .bss : { *(.bss) } } kernel.c /* * kernel.c */ void kmain(void) { const char *str = "my first kernel"; char *vidptr = (char*)0xb8000; //video mem begins here. unsigned int = 0; unsigned int j = 0; /* loops clears screen * there 25 lines each of 80 columns; each element takes 2 bytes */ while(j < 80 * 25 * 2) { /* blank character */ vidptr[j] = ' '; /* attribute-byte - light grey on black screen */ vidptr[j+1] = 0x07; j = j + 2; } j = 0; /* loop writes string video memory */ while(str[j] != '\0') { /...
Read more

ios - Debugging Core Data __NSCFSet addObject nil exception -

-
i'm getting exceptions thrown during unit tests, on core data thread message: coredata: error: serious application error. exception caught during core data change processing. bug within observer of nsmanagedobjectcontextobjectsdidchangenotification. -[__nscfset addobject:]: attempt insert nil userinfo (null) *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[__nscfset addobject:]: attempt insert nil' *** first throw call stack: ( 0 corefoundation 0x00683a14 __exceptionpreprocess + 180 1 libobjc.a.dylib 0x02334e02 objc_exception_throw + 50 2 corefoundation 0x0068393d +[nsexception raise:format:] + 141 3 corefoundation 0x005595b9 -[__nscfset addobject:] + 185 4 coredata 0x001d47c0 -[nsmanagedobjectcontext(_nsinternalchangeprocessing) _processpendinginsertions:withdeletions:withupdate...
Read more