android - RecyclerView onDrawOver view disappear after scroll -


i want display view (example textview) on recyclerview after scroll position (example: 3) use

public class headeritemdecoration extends recyclerview.itemdecoration {      @override     public void ondrawover(canvas c, recyclerview parent, recyclerview.state state) {         super.ondrawover(c, parent, state);         int topchildposition = parent.getchildadapterposition(parent.getchildat(0));          if(topchildposition == 3) {             log.i("tag", "draw header");             textview textview = new textview(parent.getcontext());             textview.settext("bbdasdasd");             textview.setbackgroundcolor(color.red);             textview.layout(0, 0, 100, 100);             drawtext(c, textview);         }     }      private void drawtext(canvas c, view header) {         c.save();         c.translate(0, 0);         header.draw(c);         c.restore();     } }

and

mrecyclerview.additemdecoration(new headeritemdecoration());

i work problem textview gone if continue scroll. how make view visible after draw it? or suggestion great appreciated.

enter image description here

just change if condition:

if(topchildposition == 3) {     ... }

to: 

if(topchildposition >= 3) {     ... }

so view remain visible if continue scroll down.

if want remain visible if scroll top, add member variable remember if view shown, if it's shown, keep drawing it.


Comments

Post a Comment

Popular posts from this blog

php - Vagrant up error - Uncaught Reflection Exception: Class DOMDocument does not exist -

i've set bento/ubuntu-16.04 vagrant box using php 5.6, , getting following error quite few times when try , run shell script: "uncaught reflection exception: class domdocument not exist". i've tried adding following top of script (not together), each no success: "sudo apt-get install php5.6-xml", "sudo apt-get install php5-xml", "sudo apt-get install php-dom" i've tried resetting server "sudo service apache2 restart". does have suggestions?
Read more

vue.js - Create hooks for automated testing -

Image
qa guys complained can't automate frontend testing. because our html looks same outside. lazy hack did this <template> <div :role="$options.name"> ... </div> </template> <script> export default { name: 'vmcomponentname' } </script> which takes name script , applies html. in browser get: <div role="vmcomponentname"> ... </div> line :role="$options.name" goes in every component. is there dry er solutions? please share. additional details i'll explain in details looking for. imagine have vmusercreate form creates user. test case can create user . to automatically test without role, have use following selector: .wrapper > .wrapper > .wrapper > .submit-button the test extremely brittle (will break lot). if use roles can use [role="vmusercreateform"] .submit-button selector. many folds less brittle. so basically, i'm ...
Read more

Add new key value to json node in java -

i have json file : { "id":1, "name":"abc", "addressdetails": { "city":"newyork" } } i wanted add 1 more key-value ("pincode" : "414141") node 'addressdetails'. i tried using : objectmapper mapper = new objectmapper(); jsonnode root = mapper.readtree(new file("d://test.json")); objectnode node = mapper.createobjectnode(); node.with("addressdetails").put("pincode", "414141"); but it's not getting added, there way can ? you can try you should modify file path objectmapper mapper = new objectmapper(); objectnode nodes = mapper.readvalue(new file("d:\\test.txt"), objectnode.class); nodes.with("addressdetails").put("pincode", "414141"); mapper.writer().writevalue(new file("d:\\test.txt"), nodes);
Read more