如何解决将可变实时数据传递给返回实时数据的函数
所以基本上我现在遇到的问题是我有这个SearchResultsViewModel类，该类基于标签搜索配置文件。我遇到的问题是searchResults实时数据未返回任何结果。但是，当我查询数据库时，我发现Room数据库中有数据。我注意到的是searchTag向#include <Windows.h>
#include <shlobj_core.h>
#define IDB_BTN 1001
LRESULT CALLBACK WindowProc(HWND,UINT,WPARAM,LPARAM);
int WINAPI wWinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,PWSTR pCmdLine,int nCmdShow) {
// Register the window class.
TCHAR CLASS_NAME[] = "Sample Window Class";
MSG msg;
WNDCLASS wc = { };
wc.lpfnWndProc = WindowProc;
wc.hInstance = hInstance;
wc.lpszClassName = CLASS_NAME;
RegisterClass(&wc);
HWND hwnd = CreateWindowEx(
0,// Optional window styles.
CLASS_NAME,// Window class
"Learn to Program Windows",// Window text
WS_OVERLAPPEDWINDOW,// Window style
// Size and position
CW_USEDEFAULT,CW_USEDEFAULT,NULL,// Parent window
NULL,// Menu
hInstance,// Instance handle
NULL // Additional application data
);
HWND btn = CreateWindow(
"BUTTON","OPEN",WS_TABSTOP | WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON,500,200,100,hwnd,(HMENU)IDB_BTN,(HINSTANCE)GetWindowLongPtr(hwnd,GWLP_HINSTANCE),NULL);
if (hwnd == NULL)
{
return 0;
}
ShowWindow(hwnd,nCmdShow);
while (GetMessageW(&msg,0))
{
TranslateMessage(&msg);
DispatchMessageW(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WindowProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
switch (uMsg)
{
case WM_COMMAND:
switch (LOWORD(wParam))
{
case IDB_BTN:
{
//ShellExecute(NULL,"open","explorer.exe",SW_NORMAL);
LPCWSTR pszPathToOpen = L"C:\\Windows";
PIDLIST_ABSOLUTE pidl;
if (SUCCEEDED(SHParseDisplayName(pszPathToOpen,&pidl,0)))
{
ITEMIDLIST idNull = { 0 };
LPCITEMIDLIST pidlNull[1] = { &idNull };
SHOpenFolderAndSelectItems(pidl,1,pidlNull,0);
ILFree(pidl);
}
return 0;
}
default:
break;
};
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd,uMsg,wParam,lParam);
}
发送了null，这导致它在Fragment中没有观察到数据。但是，searchTag并不是真的为空，因为我已经成功查询了API并将结果保存到Room DB中。是否想知道有一种方法可以解决此问题并仍然保持绑定？
Fragment.kt
repository.getSearchedBookProfilesByLabelRoomSearchResultsViewModel.kt
private fun displaySearchResultList() = launch {
viewModel.searchResultsProfiles()
viewModel.searchResults?.observe(viewLifecycleOwner,Observer { profiles ->
Log.i("OBSERVER",profiles.size.toString())
adapterSearchResultsList.setList(profiles)
adapterSearchResultsList.notifyDataSetChanged()
})
}
class.xml
@Bindable
var searchTag = MutableLiveData<String>()
var searchResults: LiveData<List<ProfileSearchResults>>? =
repository.getSearchedBookProfilesByLabelRoom(searchTag.value.toString())
fun searchLabelTag() = viewModelScope.launch {
searchResultsProfiles()
}
suspend fun searchResultsProfiles() {
val tag = searchTag.value.toString()
repository.getSearchedBookProfilesByLabel(profileId,tag)
searchResults = repository.getSearchedBookProfilesByLabelRoom(tag)
}
Repository.kt
<com.google.android.material.textfield.TextInputLayout
android:id="@+id/searched_label_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginEnd="60dp"
android:layout_marginBottom="8dp"
app:errorEnabled="true"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<com.google.android.material.textfield.TextInputEditText
android:id="@+id/searched_label"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Search"
android:text="@={viewModel.searchTag}"
android:inputType="text"/>
</com.google.android.material.textfield.TextInputLayout>
...
<ImageButton
android:id="@+id/searched_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:onClick="@{(v) -> viewModel.searchLabelTag()}"
android:src="@drawable/ic_search"
app:layout_constraintBottom_toBottomOf="@+id/searched_label_layout"
app:layout_constraintStart_toEndOf="@+id/searched_label_layout"
app:layout_constraintTop_toTopOf="parent" />
Dao.kt
override suspend fun getSearchedBookProfilesByLabel(profileId: Int,label: String): LiveData<List<ProfileSearchResults>>? {
return withContext(IO) {
val result = fetchAllProfiledByLabelSource(profileId,label)
delay(500)
when(result.status){
Status.SUCCESS -> return@withContext getSearchedBookProfilesByLabelRoom(label)
Status.LOADING -> return@withContext null
Status.ERROR -> return@withContext null
}
}
}
override fun getSearchedBookProfilesByLabelRoom(label: String): LiveData<List<ProfileSearchResults>>? {
Log.i("REPO",label)
return profileSearchResultsDao.getBookProfilesByLabel(label)
}
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