Communities

Writing
Writing
Codidact Meta
Codidact Meta
The Great Outdoors
The Great Outdoors
Photography & Video
Photography & Video
Scientific Speculation
Scientific Speculation
Cooking
Cooking
Electrical Engineering
Electrical Engineering
Judaism
Judaism
Languages & Linguistics
Languages & Linguistics
Software Development
Software Development
Mathematics
Mathematics
Christianity
Christianity
Code Golf
Code Golf
Music
Music
Physics
Physics
Linux Systems
Linux Systems
Power Users
Power Users
Tabletop RPGs
Tabletop RPGs
Community Proposals
Community Proposals
tag:snake search within a tag
answers:0 unanswered questions
user:xxxx search by author id
score:0.5 posts with 0.5+ score
"snake oil" exact phrase
votes:4 posts with 4+ votes
created:<1w created < 1 week ago
post_type:xxxx type of post
Search help
Notifications
Mark all as read See all your notifications »
Users Search
Help Dashboard Sign In Sign Up
Q&A Code Reviews Meta

Welcome to Software Development on Codidact!

Will you help us build our independent community of developers helping developers? We're small and trying to grow. We welcome questions about all aspects of software development, from design to code to QA and more. Got questions? Got answers? Got code you'd like someone to review? Please join us.

Review Suggested Edit

You can't approve or reject suggested edits because you haven't yet earned the Edit Posts ability.
View post

Approved.
This suggested edit was approved and applied to the post about 3 years ago by Anonymous‭.

57 / 255
  • how to change adapter without looking at adapter?
  • Why is the switch statement not executing the correct case blocks?
  • ```java
  • String order;
  • switch (i){
  • case 0:
  • order = CallLog.Calls.DATE + " DESC ";
  • contactViewAdapter = new ContactViewAdapter(getActivity(),getActivity(),new ReadContacts().CallLog(getActivity(), order),"dialer");
  • recyclerViewCallLog.swapAdapter(contactViewAdapter,true);
  • recyclerViewCallLog.setAdapter(contactViewAdapter);
  • recyclerViewCallLog.invalidate();
  • recyclerViewCallLog.getAdapter().notifyDataSetChanged();
  • case 1:
  • order = CallLog.Calls.DATE+" ASC ";
  • contactViewAdapter = new ContactViewAdapter(getActivity(),getActivity(),new ReadContacts().CallLog(getActivity(), order),"dialer");
  • recyclerViewCallLog.swapAdapter(contactViewAdapter,true);
  • recyclerViewCallLog.setAdapter(contactViewAdapter);
  • recyclerViewCallLog.invalidate();
  • recyclerViewCallLog.getAdapter().notifyDataSetChanged();
  • case 2:
  • order = CallLog.Calls.CACHED_NAME+" ASC ";
  • contactViewAdapter = new ContactViewAdapter(getActivity(),getActivity(),new ReadContacts().CallLog(getActivity(), order),"dialer");
  • recyclerViewCallLog.swapAdapter(contactViewAdapter,true);
  • recyclerViewCallLog.setAdapter(contactViewAdapter);
  • recyclerViewCallLog.invalidate();
  • recyclerViewCallLog.getAdapter().notifyDataSetChanged();
  • default:
  • // contactViewAdapter = adapter(CallLog.Calls.DATE+" DESC ");
  • // recyclerViewCallLog.invalidate();
  • // recyclerViewCallLog.setAdapter(contactViewAdapter);
  • }
  • ```
  • I was trying to change adapter above way. But I noticed. it doesn't affect earlier data. How can I remove earlier data and set new data without looking at adapter. Even, using the above code sort order is working for DATE ASC. But case 0 is default one. Hence the date DESC had to work. But it doesn't. How can I change adapter? If I add case 0 to default then it works fine. I have recently updated my code.
  • ```java
  • final String[] order = new String[1];
  • switch (i){
  • case 0:
  • new Handler().postDelayed(() -> {
  • order[0] = CallLog.Calls.DATE + " DESC ";
  • contactViewAdapter = new ContactViewAdapter(getActivity(), getActivity(), new ReadContacts().CallLog(getActivity(), order[0]), "dialer");
  • recyclerViewCallLog.swapAdapter(contactViewAdapter, true);
  • recyclerViewCallLog.setAdapter(contactViewAdapter);
  • recyclerViewCallLog.invalidate();
  • recyclerViewCallLog.getAdapter().notifyDataSetChanged();
  • },1000);
  • case 1:
  • new Handler().postDelayed(() -> {
  • order[0] = CallLog.Calls.DATE+" ASC ";
  • contactViewAdapter = new ContactViewAdapter(getActivity(),getActivity(),new ReadContacts().CallLog(getActivity(), order[0]),"dialer");
  • recyclerViewCallLog.swapAdapter(contactViewAdapter,true);
  • recyclerViewCallLog.setAdapter(contactViewAdapter);
  • recyclerViewCallLog.invalidate();
  • recyclerViewCallLog.getAdapter().notifyDataSetChanged();
  • },1000);
  • case 2:
  • new Handler().postDelayed(() -> {
  • order[0] = CallLog.Calls.CACHED_NAME+" ASC ";
  • contactViewAdapter = new ContactViewAdapter(getActivity(),getActivity(),new ReadContacts().CallLog(getActivity(), order[0]),"dialer");
  • recyclerViewCallLog.swapAdapter(contactViewAdapter,true);
  • recyclerViewCallLog.setAdapter(contactViewAdapter);
  • recyclerViewCallLog.invalidate();
  • recyclerViewCallLog.getAdapter().notifyDataSetChanged();
  • },1000);
  • default:
  • new Handler().postDelayed(() -> {
  • order[0] = CallLog.Calls.DATE + " DESC ";
  • contactViewAdapter = new ContactViewAdapter(getActivity(), getActivity(), new ReadContacts().CallLog(getActivity(), order[0]), "dialer");
  • recyclerViewCallLog.swapAdapter(contactViewAdapter, true);
  • recyclerViewCallLog.setAdapter(contactViewAdapter);
  • recyclerViewCallLog.invalidate();
  • recyclerViewCallLog.getAdapter().notifyDataSetChanged();
  • },1000);
  • }
  • ```
  • I earlier thought that I must change or add and delete values in Adapter. But I wanted to directly change adapter instead of doing "something" inside adapter. That's why I said "how to change adapter without looking at adapter?". When I was using switch statement, my data wasn't changing that's why I thought I must work on adapter but It was worse idea. Why adapter isn't changing whenever I am clicking on some other button (which returning i=1,2,3 or whatever)?
  • In the code below, the value of `order` variable should change according to `i`'s value:
  • ```java
  • String order;
  • switch (i){
  • case 0:
  • order = CallLog.Calls.DATE + " DESC ";
  • contactViewAdapter = new ContactViewAdapter(getActivity(),getActivity(),new ReadContacts().CallLog(getActivity(), order),"dialer");
  • recyclerViewCallLog.swapAdapter(contactViewAdapter,true);
  • recyclerViewCallLog.setAdapter(contactViewAdapter);
  • recyclerViewCallLog.invalidate();
  • recyclerViewCallLog.getAdapter().notifyDataSetChanged();
  • case 1:
  • order = CallLog.Calls.DATE+" ASC ";
  • contactViewAdapter = new ContactViewAdapter(getActivity(),getActivity(),new ReadContacts().CallLog(getActivity(), order),"dialer");
  • recyclerViewCallLog.swapAdapter(contactViewAdapter,true);
  • recyclerViewCallLog.setAdapter(contactViewAdapter);
  • recyclerViewCallLog.invalidate();
  • recyclerViewCallLog.getAdapter().notifyDataSetChanged();
  • case 2:
  • order = CallLog.Calls.CACHED_NAME+" ASC ";
  • contactViewAdapter = new ContactViewAdapter(getActivity(),getActivity(),new ReadContacts().CallLog(getActivity(), order),"dialer");
  • recyclerViewCallLog.swapAdapter(contactViewAdapter,true);
  • recyclerViewCallLog.setAdapter(contactViewAdapter);
  • recyclerViewCallLog.invalidate();
  • recyclerViewCallLog.getAdapter().notifyDataSetChanged();
  • default:
  • //contactViewAdapter = adapter(CallLog.Calls.DATE+" DESC ");
  • //recyclerViewCallLog.invalidate();
  • //recyclerViewCallLog.setAdapter(contactViewAdapter);
  • }
  • ```
  • When `i` is `0`, the order should be `DESC`, but it's actually `ASC`. I've updated the code to this:
  • ```java
  • final String[] order = new String[1];
  • switch (i){
  • case 0:
  • new Handler().postDelayed(() -> {
  • order[0] = CallLog.Calls.DATE + " DESC ";
  • contactViewAdapter = new ContactViewAdapter(getActivity(), getActivity(), new ReadContacts().CallLog(getActivity(), order[0]), "dialer");
  • recyclerViewCallLog.swapAdapter(contactViewAdapter, true);
  • recyclerViewCallLog.setAdapter(contactViewAdapter);
  • recyclerViewCallLog.invalidate();
  • recyclerViewCallLog.getAdapter().notifyDataSetChanged();
  • },1000);
  • case 1:
  • new Handler().postDelayed(() -> {
  • order[0] = CallLog.Calls.DATE+" ASC ";
  • contactViewAdapter = new ContactViewAdapter(getActivity(),getActivity(),new ReadContacts().CallLog(getActivity(), order[0]),"dialer");
  • recyclerViewCallLog.swapAdapter(contactViewAdapter,true);
  • recyclerViewCallLog.setAdapter(contactViewAdapter);
  • recyclerViewCallLog.invalidate();
  • recyclerViewCallLog.getAdapter().notifyDataSetChanged();
  • },1000);
  • case 2:
  • new Handler().postDelayed(() -> {
  • order[0] = CallLog.Calls.CACHED_NAME+" ASC ";
  • contactViewAdapter = new ContactViewAdapter(getActivity(),getActivity(),new ReadContacts().CallLog(getActivity(), order[0]),"dialer");
  • recyclerViewCallLog.swapAdapter(contactViewAdapter,true);
  • recyclerViewCallLog.setAdapter(contactViewAdapter);
  • recyclerViewCallLog.invalidate();
  • recyclerViewCallLog.getAdapter().notifyDataSetChanged();
  • },1000);
  • default:
  • new Handler().postDelayed(() -> {
  • order[0] = CallLog.Calls.DATE + " DESC ";
  • contactViewAdapter = new ContactViewAdapter(getActivity(), getActivity(), new ReadContacts().CallLog(getActivity(), order[0]), "dialer");
  • recyclerViewCallLog.swapAdapter(contactViewAdapter, true);
  • recyclerViewCallLog.setAdapter(contactViewAdapter);
  • recyclerViewCallLog.invalidate();
  • recyclerViewCallLog.getAdapter().notifyDataSetChanged();
  • },1000);
  • }
  • ```
  • But now it doesn't work when `i` is `1` or `2`: it should be `ASC` but in those cases it ends up being `DESC`.
  • How can I fix this?
java android switch-statement recyclerview adapter
java android switch-statement

Suggested about 3 years ago by hkotsubo‭