我目前正在创建一个可帮助您完成任务的Android应用。我将LiveData和ListAdapter一起使用,后者列出了Fragment和DiffUtil中的所有不同任务,以测试ListAdapter中的更改。在我解释我的问题之前:这是一些相关的代码:
SubTaskFragment.java:
public class SubTaskFragment extends Fragment {
private RecyclerView recyclerView;
private SubTaskAdapter adapter;
private SubTaskViewModel viewModel;
private static final String TAG = "SubTaskFragment";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment and setup recycler view
View rootView = inflater.inflate(R.layout.fragment_sub_task, container, false);
recyclerView = (RecyclerView) rootView.findViewById(R.id.sub_task_recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
//set adapter
adapter = new SubTaskAdapter(getContext());
recyclerView.setAdapter(adapter);
viewModel = ViewModelProviders.of(this).get(SubTaskViewModel.class);
viewModel.getSubTasks().observe(getViewLifecycleOwner(), new Observer<List<SubTask>>() {
@Override
public void onChanged(@Nullable List<SubTask> subTasks) {
//Update RecyclerView
Log.d(TAG, "onChanged: subTasks length = " + subTasks.size());
adapter.submitList(subTasks);
}
});
SubTaskAdapter.java
public class SubTaskAdapter extends ListAdapter<SubTask, SubTaskAdapter.ViewHolder> {
private static final String TAG = "SubTaskAdapter";
private SubTaskViewModel subTaskViewModel;
public SubTaskAdapter(Context context) {
super(DIFF_CALLBACK);
this.context = context;
}
private static final DiffUtil.ItemCallback<SubTask> DIFF_CALLBACK = new DiffUtil.ItemCallback<SubTask>() {
@Override
public boolean areItemsTheSame(@NonNull SubTask oldTask, @NonNull SubTask newTask) {
Log.d(TAG, "areItemsTheSame: oldTask name: " + oldTask.getName() + " id: " + oldTask.getId() + " ### newTask name: " + newTask.getName() + " id: " + newTask.getId());
return oldTask.getId() == newTask.getId();
}
@Override
public boolean areContentsTheSame(@NonNull SubTask oldTask, @NonNull SubTask newTask) {
Log.d(TAG, "areContentsTheSame: oldTask name: " + oldTask.getName() + " ### newTask name: " + newTask.getName());
boolean contentsSame = oldTask.getName().equals(newTask.getName()) &&
oldTask.getDueDate().equals(newTask.getDueDate()) &&
oldTask.isCompleted() == newTask.isCompleted() &&
oldTask.getMainTaskId() == (newTask.getMainTaskId());
Log.d(TAG, "areContentsTheSame: = " + contentsSame);
return contentsSame;
}
};
@Override
public void onBindViewHolder(@NonNull ViewHolder viewHolder, int i) {
SubTask subTask = getItem(i);
Log.d(TAG, "onBindViewHolder: pos: " + i + " name: " + subTask.getName() + " Is overdue: " + subTask.isOverdue());
Log.d(TAG, "onBindViewHolder: " + subTask.getName() + " isOverdue = " + subTask.isOverdue());
//SET BACKGROUND COLOR OF LIST ITEM
if (subTask.isOverdue()) {
viewHolder.card.setCardBackgroundColor(context.getResources().getColor(R.color.red));
viewHolder.subTaskName.setTextColor(context.getResources().getColor(R.color.colorAccent));
viewHolder.mainTaskName.setTextColor(context.getResources().getColor(R.color.colorAccent));
}
if (subTask.isCompleted()) {
viewHolder.checkBox.setChecked(true);
Log.d(TAG, "onBindViewHolder: " + subTask.getName() + " set to checked");
} else {
viewHolder.checkBox.setChecked(false);
Log.d(TAG, "onBindViewHolder: " + subTask.getName() + " set to unchecked");
}
viewHolder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener()
{
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
Log.d(TAG, "onCheckedChanged: called for subTask " + subTask.getName() + " isChecked = " + isChecked);
subTaskViewModel = ViewModelProviders.of((FragmentActivity) context).get(SubTaskViewModel.class);
if (isChecked) {
subTask.setCompleted(true);
subTaskViewModel.updateSubTask(subTask);
} else {
subTask.setCompleted(false);
subTaskViewModel.updateSubTask(subTask);
}
}
});
我遇到的第一个问题是,当用户选中列表项的复选框时,列表项会变成灰色like so。这不是预期的行为,因为列表项的颜色在检查时不应更改。如果未选中,则不会发生这种情况。
这是此操作的日志:
2020-01-19 15:24:47.572 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskAdapter: onCheckedChanged: called for subTask Test 1 isChecked = true
2020-01-19 15:24:47.575 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskViewModel: updateSubTask: CALLED for Test 1 isCompleted = true isOverdue = false
2020-01-19 15:24:47.602 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskFragment: onChanged: subTasks length = 5
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Wash car id: 3 ### newTask name: Wash car id: 3
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Read OS book id: 2 ### newTask name: Read OS book id: 2
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Read database book id: 1 ### newTask name: Read database book id: 1
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 1 id: 4 ### newTask name: Test 1 id: 4
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 2 id: 5 ### newTask name: Test 2 id: 5
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 2 id: 5 ### newTask name: Test 2 id: 5
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 1 id: 4 ### newTask name: Test 1 id: 4
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Read database book id: 1 ### newTask name: Read database book id: 1
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Read OS book id: 2 ### newTask name: Read OS book id: 2
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Wash car id: 3 ### newTask name: Wash car id: 3
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Wash car ### newTask name: Wash car
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Read OS book ### newTask name: Read OS book
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Read database book ### newTask name: Read database book
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Test 1 ### newTask name: Test 1
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = false
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Test 2 ### newTask name: Test 2
2020-01-19 15:24:47.603 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:24:47.652 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskAdapter: onBindViewHolder: pos: 3 name: Test 1 Is overdue: false
2020-01-19 15:24:47.652 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskAdapter: onBindViewHolder: Test 1 isOverdue = false
2020-01-19 15:24:47.655 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskAdapter: onBindViewHolder: Test 1 set to checked
2020-01-19 15:24:50.633 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskAdapter: onCheckedChanged: called for subTask Test 1 isChecked = false
2020-01-19 15:24:50.633 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskViewModel: updateSubTask: CALLED for Test 1 isCompleted = false isOverdue = false
2020-01-19 15:24:50.664 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskFragment: onChanged: subTasks length = 5
2020-01-19 15:24:50.664 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Wash car id: 3 ### newTask name: Wash car id: 3
2020-01-19 15:24:50.664 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Read OS book id: 2 ### newTask name: Read OS book id: 2
2020-01-19 15:24:50.664 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Read database book id: 1 ### newTask name: Read database book id: 1
2020-01-19 15:24:50.664 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 1 id: 4 ### newTask name: Test 1 id: 4
2020-01-19 15:24:50.664 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 2 id: 5 ### newTask name: Test 2 id: 5
2020-01-19 15:24:50.664 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 2 id: 5 ### newTask name: Test 2 id: 5
2020-01-19 15:24:50.664 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 1 id: 4 ### newTask name: Test 1 id: 4
2020-01-19 15:24:50.664 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Read database book id: 1 ### newTask name: Read database book id: 1
2020-01-19 15:24:50.664 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Read OS book id: 2 ### newTask name: Read OS book id: 2
2020-01-19 15:24:50.664 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Wash car id: 3 ### newTask name: Wash car id: 3
2020-01-19 15:24:50.664 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Wash car ### newTask name: Wash car
2020-01-19 15:24:50.665 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:24:50.665 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Read OS book ### newTask name: Read OS book
2020-01-19 15:24:50.665 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:24:50.665 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Read database book ### newTask name: Read database book
2020-01-19 15:24:50.665 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:24:50.665 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Test 1 ### newTask name: Test 1
2020-01-19 15:24:50.665 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:24:50.665 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Test 2 ### newTask name: Test 2
2020-01-19 15:24:50.665 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
我遇到的下一个(可能与之相关)的问题是,列表项“过期”(红色任务)and I check it off,ListAdapter turn red when I hit it's corresponding checkbox中的其他项都是“过期”。这不是它应该起作用的方式。这些列表项应该是白色的,因为这些任务尚未过期。当我第二次选中/取消选中它时,它最终再次变回白色。
检查过期任务后,该应用程序将正常运行。它从屏幕上删除,因为我的SQL SELECT语句不再返回已检查的过期任务。
这是我两次检查/取消检查未逾期的列表项时的日志(第3个gif)。这里要注意的重要一件事是,在选中测试1时,由于将isCompleted从true设置为false,因此在检查列表项时
areContentsTheSame()
正确返回false。但是,即使isCompleted已从true设置为false,当未选中areContentsTheSame()
时,它也会错误地返回true。同样,即使isOverdue为false,列表项也突然变成红色:2020-01-19 15:28:52.071 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskAdapter: onCheckedChanged: called for subTask Test 1 isChecked = true
2020-01-19 15:28:52.072 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskViewModel: updateSubTask: CALLED for Test 1 isCompleted = true isOverdue = false
2020-01-19 15:28:52.104 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskFragment: onChanged: subTasks length = 4
2020-01-19 15:28:52.104 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Wash car id: 3 ### newTask name: Wash car id: 3
2020-01-19 15:28:52.104 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Read OS book id: 2 ### newTask name: Read OS book id: 2
2020-01-19 15:28:52.104 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 1 id: 4 ### newTask name: Test 1 id: 4
2020-01-19 15:28:52.104 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 2 id: 5 ### newTask name: Test 2 id: 5
2020-01-19 15:28:52.104 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 2 id: 5 ### newTask name: Test 2 id: 5
2020-01-19 15:28:52.104 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 1 id: 4 ### newTask name: Test 1 id: 4
2020-01-19 15:28:52.105 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Read OS book id: 2 ### newTask name: Read OS book id: 2
2020-01-19 15:28:52.105 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Wash car id: 3 ### newTask name: Wash car id: 3
2020-01-19 15:28:52.105 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Wash car ### newTask name: Wash car
2020-01-19 15:28:52.105 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:28:52.105 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Read OS book ### newTask name: Read OS book
2020-01-19 15:28:52.105 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:28:52.105 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Test 1 ### newTask name: Test 1
2020-01-19 15:28:52.105 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = false
2020-01-19 15:28:52.105 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Test 2 ### newTask name: Test 2
2020-01-19 15:28:52.105 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:28:52.136 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskAdapter: onBindViewHolder: pos: 2 name: Test 1 Is overdue: false
2020-01-19 15:28:52.137 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskAdapter: onBindViewHolder: Test 1 isOverdue = false
2020-01-19 15:28:52.137 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskAdapter: onBindViewHolder: Test 1 set to checked
2020-01-19 15:28:54.080 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskAdapter: onCheckedChanged: called for subTask Test 1 isChecked = false
2020-01-19 15:28:54.081 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskViewModel: updateSubTask: CALLED for Test 1 isCompleted = false isOverdue = false
2020-01-19 15:28:54.102 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskFragment: onChanged: subTasks length = 4
2020-01-19 15:28:54.103 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Wash car id: 3 ### newTask name: Wash car id: 3
2020-01-19 15:28:54.103 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Read OS book id: 2 ### newTask name: Read OS book id: 2
2020-01-19 15:28:54.103 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 1 id: 4 ### newTask name: Test 1 id: 4
2020-01-19 15:28:54.103 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 2 id: 5 ### newTask name: Test 2 id: 5
2020-01-19 15:28:54.103 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 2 id: 5 ### newTask name: Test 2 id: 5
2020-01-19 15:28:54.103 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 1 id: 4 ### newTask name: Test 1 id: 4
2020-01-19 15:28:54.103 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Read OS book id: 2 ### newTask name: Read OS book id: 2
2020-01-19 15:28:54.103 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Wash car id: 3 ### newTask name: Wash car id: 3
2020-01-19 15:28:54.103 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Wash car ### newTask name: Wash car
2020-01-19 15:28:54.103 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:28:54.103 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Read OS book ### newTask name: Read OS book
2020-01-19 15:28:54.103 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:28:54.103 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Test 1 ### newTask name: Test 1
2020-01-19 15:28:54.103 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:28:54.103 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Test 2 ### newTask name: Test 2
2020-01-19 15:28:54.103 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:28:58.480 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskAdapter: onCheckedChanged: called for subTask Test 1 isChecked = true
2020-01-19 15:28:58.481 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskViewModel: updateSubTask: CALLED for Test 1 isCompleted = true isOverdue = false
2020-01-19 15:28:58.498 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskFragment: onChanged: subTasks length = 4
2020-01-19 15:28:58.499 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Wash car id: 3 ### newTask name: Wash car id: 3
2020-01-19 15:28:58.499 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Read OS book id: 2 ### newTask name: Read OS book id: 2
2020-01-19 15:28:58.499 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 1 id: 4 ### newTask name: Test 1 id: 4
2020-01-19 15:28:58.499 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 2 id: 5 ### newTask name: Test 2 id: 5
2020-01-19 15:28:58.499 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 2 id: 5 ### newTask name: Test 2 id: 5
2020-01-19 15:28:58.499 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 1 id: 4 ### newTask name: Test 1 id: 4
2020-01-19 15:28:58.499 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Read OS book id: 2 ### newTask name: Read OS book id: 2
2020-01-19 15:28:58.499 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Wash car id: 3 ### newTask name: Wash car id: 3
2020-01-19 15:28:58.499 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Wash car ### newTask name: Wash car
2020-01-19 15:28:58.499 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:28:58.499 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Read OS book ### newTask name: Read OS book
2020-01-19 15:28:58.499 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:28:58.499 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Test 1 ### newTask name: Test 1
2020-01-19 15:28:58.499 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = false
2020-01-19 15:28:58.499 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Test 2 ### newTask name: Test 2
2020-01-19 15:28:58.499 27375-27504/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:28:58.529 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskAdapter: onBindViewHolder: pos: 2 name: Test 1 Is overdue: false
2020-01-19 15:28:58.529 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskAdapter: onBindViewHolder: Test 1 isOverdue = false
2020-01-19 15:28:58.529 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskAdapter: onBindViewHolder: Test 1 set to checked
2020-01-19 15:28:59.922 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskAdapter: onCheckedChanged: called for subTask Test 1 isChecked = false
2020-01-19 15:28:59.922 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskViewModel: updateSubTask: CALLED for Test 1 isCompleted = false isOverdue = false
2020-01-19 15:28:59.941 27375-27375/com.johnsorhannus.divideandconquer D/SubTaskFragment: onChanged: subTasks length = 4
2020-01-19 15:28:59.941 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Wash car id: 3 ### newTask name: Wash car id: 3
2020-01-19 15:28:59.941 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Read OS book id: 2 ### newTask name: Read OS book id: 2
2020-01-19 15:28:59.941 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 1 id: 4 ### newTask name: Test 1 id: 4
2020-01-19 15:28:59.941 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 2 id: 5 ### newTask name: Test 2 id: 5
2020-01-19 15:28:59.941 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 2 id: 5 ### newTask name: Test 2 id: 5
2020-01-19 15:28:59.941 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Test 1 id: 4 ### newTask name: Test 1 id: 4
2020-01-19 15:28:59.941 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Read OS book id: 2 ### newTask name: Read OS book id: 2
2020-01-19 15:28:59.941 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areItemsTheSame: oldTask name: Wash car id: 3 ### newTask name: Wash car id: 3
2020-01-19 15:28:59.941 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Wash car ### newTask name: Wash car
2020-01-19 15:28:59.941 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:28:59.941 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Read OS book ### newTask name: Read OS book
2020-01-19 15:28:59.941 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:28:59.941 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Test 1 ### newTask name: Test 1
2020-01-19 15:28:59.941 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
2020-01-19 15:28:59.941 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: oldTask name: Test 2 ### newTask name: Test 2
2020-01-19 15:28:59.941 27375-27409/com.johnsorhannus.divideandconquer D/SubTaskAdapter: areContentsTheSame: = true
我要注意的另一件事是,列表中的每个项目都两次调用
areItemsTheSame()
,而每个列表项仅被调用一次areContentsTheSame()
。这似乎不是正常的行为,所以这可能以某种方式导致了问题。关于这两个问题是否相关以及如何解决的任何想法? 最佳答案
您在这里遇到了两个问题。由于RecyclerView的内置默认动画,第一个(灰色高亮)正在发生。选中该框时,RecyclerView会创建一个新的ViewHolder
并进行交叉淡入淡出。有关如何解决此问题的更多信息,请参见此问题/答案:RecyclerView.ItemDecoration doesn't update after item is removed from RecyclerView.Adapter
第二个(红色背景)是您的onBindViewHolder()
方法中的错误,该错误导致视图无法正确回收:
if (subTask.isOverdue()) {
viewHolder.card.setCardBackgroundColor(context.getResources().getColor(R.color.red));
viewHolder.subTaskName.setTextColor(context.getResources().getColor(R.color.colorAccent));
viewHolder.mainTaskName.setTextColor(context.getResources().getColor(R.color.colorAccent));
}
每个这样的
if
语句都需要一个else
大小写,以将视图设置回普通颜色。如果没有这样的else
,您的红色视图将被回收到另一个位置,并且颜色不变。