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This suggested edit was approved and applied to the post over 2 years ago by Anonymous‭.

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  • 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 over 2 years ago by hkotsubo‭