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Q&A Why is the switch statement not executing the correct case blocks?

In the code below, the value of order variable should change according to i's value: String order; switch (i){ case 0: order = CallLog.Calls.DATE + " DESC "; contactViewAda...

1 answer  ·  posted 3y ago by Anonymous‭  ·  last activity 3y ago by hkotsubo‭

Question java android switch-statement
#3: Post edited by user avatar hkotsubo‭ · 2021-09-24T15:42:23Z (about 3 years ago)
Rephrasing based on the comments, removed irrelevant tags
  • 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 adapter
java android switch-statement
#2: Post edited by user avatar Anonymous‭ · 2021-09-24T09:08:08Z (about 3 years ago)
  • ```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);
  • }
  • ```
  • ```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)?
#1: Initial revision by user avatar Anonymous‭ · 2021-09-23T16:44:22Z (about 3 years ago) 
how to change adapter without looking at adapter?
```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);
        }
```
java android switch-statement recyclerview adapter