任务列表未实时更新

Question

EDIT：在MainActivity中运行相同的代码后，public void handleDialogClose(DialogInterface dialog)工作，所有内容都得到了更新。所以现在主要的问题是为什么它不在其他片段中运行？

我看到的唯一区别是，在MainActivity上，代码在protected void onCreate(Bundle savedInstanceState)中运行

而在Assignment片段上它在public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)中的运行

---

添加新任务或更新现有任务后，我的任务列表不会更新，除非我从一个片段转到另一个片段，然后再回来，但删除任务功能确实有效，并从列表中删除任务，而不转到其他片段。

注意：当代码在MainActivity中时，它确实起作用

我尝试记录public void handleDialogClose(DialogInterface dialog)但它没有起作用，所以我想也许这就是为什么。。。

这是我的片段中的代码：

public class AssignmentFragment extends Fragment implements DialogCloseListener {
public static Context context;
private FragmentAssignmentBinding binding;
private FloatingActionButton fab;
private RecyclerView tasksRecyclerView;
private ToDoAdapter tasksAdapter;
private List<ToDoModel> taskList;
private DatabaseHandler db;
public View onCreateView(@NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
binding = FragmentAssignmentBinding.inflate(inflater, container, false);
View root = binding.getRoot();
AssignmentFragment.context = getContext();
db = new DatabaseHandler(getContext());
db.openDatabase();
taskList = new ArrayList<>();
tasksRecyclerView = root.findViewById(R.id.tasksRecyclerView);
tasksRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
tasksAdapter = new ToDoAdapter(db,this, null);
tasksRecyclerView.setAdapter(tasksAdapter);
taskList = db.getAllTasks();
Collections.reverse(taskList);
tasksAdapter.setTasks(taskList);
ItemTouchHelper itemTouchHelper = new ItemTouchHelper(new RecyclerItemTouchHelper(tasksAdapter));
itemTouchHelper.attachToRecyclerView(tasksRecyclerView);
fab = root.findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AddNewTask.newInstance().show(getChildFragmentManager(), AddNewTask.TAG);
}
});

return root;
}
@Override
public void handleDialogClose(DialogInterface dialog){
taskList = db.getAllTasks();
Collections.reverse(taskList);
tasksAdapter.setTasks(taskList);
tasksAdapter.notifyDataSetChanged();
}
@Override
public void onDestroyView() {
super.onDestroyView();
binding = null;
}
}

以下是添加新任务的代码：

在这里，我确实尝试记录了public void onDismiss(DialogInterface dialog)，但它也没有响应。

public class AddNewTask extends BottomSheetDialogFragment {
public static final String TAG = "ActionBottomDialog";
private EditText newTaskText;
private Button newTaskSaveButton;
private DatabaseHandler db;
public static AddNewTask newInstance(){
return new AddNewTask();
}
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setStyle(STYLE_NORMAL, R.style.DialogStyle);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
View view =inflater.inflate(R.layout.new_task, container, false);
getDialog().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
return view;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState){
super.onViewCreated(view, savedInstanceState);
newTaskText = getView().findViewById(R.id.newTaskText);
newTaskSaveButton = getView().findViewById(R.id.newTaskButton);
boolean isUpdate = false;
final Bundle bundle = getArguments();
if(bundle != null){
isUpdate = true;
String task = bundle.getString("task");
newTaskText.setText(task);
if(task.length()>0) {
newTaskSaveButton.setTextColor(ContextCompat.getColor(getContext(), android.R.color.holo_blue_dark));
}
}
db = new DatabaseHandler(getActivity());
db.openDatabase();
newTaskText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence s, int i, int i1, int i2) {
if(s.toString().equals("")){
newTaskSaveButton.setEnabled(false);
newTaskSaveButton.setTextColor(Color.GRAY);
}
else{
newTaskSaveButton.setEnabled(true);
newTaskSaveButton.setTextColor(ContextCompat.getColor(getContext(), android.R.color.holo_blue_dark));
}
}
@Override
public void afterTextChanged(Editable editable) {
}
});
final boolean finalIsUpdate = isUpdate;
newTaskSaveButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String text = newTaskText.getText().toString();
if(finalIsUpdate){
db.updateTask(bundle.getInt("id"), text);
}
else{
ToDoModel task = new ToDoModel();
task.setTask(text);
task.setStatus(0);
db.insertTask(task);
}
dismiss();
}
});
}
@Override
public void onDismiss(DialogInterface dialog){
Activity activity = getActivity();
if(activity instanceof DialogCloseListener){
((DialogCloseListener)activity).handleDialogClose(dialog);
}
}
}

Answer 1

添加新任务时，应立即编写以下代码；

tasksAdapter.notifyDataSetChanged();

此代码刷新数据库。