JavaFX 8: Checkbox in TableView and Add-on into to selected Item? - checkbox

I would like to create a payroll program such that when the user tick a CheckBox in TableView, the name (String) will be carried on to the panel on the right and with TextFields to enter more info such as this:
I tried to follow the MVC hierarchy thus far as I code:
PayrollMainApp.java
public class PayrollMainApp extends Application {
private Stage primaryStage;
private BorderPane rootLayout;
private ObservableList<Employee> selectEmployeeTable = FXCollections.observableArrayList();
public PayrollMainApp(){
selectEmployeeTable.add(new Employee(false,"Hans Muster"));
selectEmployeeTable.add(new Employee(true,"Ruth Mueller"));
selectEmployeeTable.add(new Employee(false,"Heinz Kurz"));
selectEmployeeTable.add(new Employee(false,"Cornelia Meier"));
selectEmployeeTable.add(new Employee(false,"Werner Meyer"));
selectEmployeeTable.add(new Employee(false,"Lydia Kunz"));
selectEmployeeTable.add(new Employee(false,"Anna Best"));
selectEmployeeTable.add(new Employee(false,"Stefan Meier"));
selectEmployeeTable.add(new Employee(false,"Martin Mueller"));
}
public ObservableList<Employee> getSelectEmployeeTable(){
return selectEmployeeTable;
}
#Override
public void start(Stage primaryStage) {
this.primaryStage = primaryStage;
this.primaryStage.setTitle("PayrollApp");
initRootLayout();
showEmployeeOverview();
}
/**
* Initializes the root layout.
*/
public void initRootLayout() {
try {
// Load root layout from fxml file.
FXMLLoader loader = new FXMLLoader();
loader.setLocation(PayrollMainApp.class.getResource("view/RootLayout.fxml"));
rootLayout = (BorderPane) loader.load();
// Show the scene containing the root layout.
Scene scene = new Scene(rootLayout);
primaryStage.setScene(scene);
primaryStage.show();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Shows the person overview inside the root layout.
*/
public void showEmployeeOverview() {
try {
// Load person overview.
FXMLLoader loader = new FXMLLoader();
loader.setLocation(PayrollMainApp.class.getResource("view/EmployeeOverview.fxml"));
AnchorPane personOverview = (AnchorPane) loader.load();
// Set person overview into the center of root layout.
rootLayout.setCenter(personOverview);
// Give the controller access to the main app
EmployeeOverviewController controller = loader.getController();
controller.setMainApp(this);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Returns the main stage.
* #return
*/
public Stage getPrimaryStage() {
return primaryStage;
}
public static void main(String[] args) {
launch(args);
}
}
Employee.java
public class Employee {
private BooleanProperty checkedBox = new SimpleBooleanProperty(false);
private StringProperty employeeName = new SimpleStringProperty();
public Employee(){
super();
}
public Employee(boolean checkedBox, String employeeName){
this.checkedBox = new SimpleBooleanProperty(false);
this.employeeName = new SimpleStringProperty(employeeName);
}
public BooleanProperty checkedBoxProperty(){
return this.checkedBox;
}
public StringProperty employeeNameProperty(){
return this.employeeName;
}
public java.lang.Boolean getSelectBox() {
return this.checkedBoxProperty().get();
}
public StringProperty getEmployeeName() {
return employeeName;
}
public void setSelectBox(final java.lang.Boolean checkedBox){
this.checkedBoxProperty().set(checkedBox);
}
public void setEmployeeName(StringProperty employeeName) {
this.employeeName = employeeName;
}
}
EmployeeOverviewController.java
public class EmployeeOverviewController {
#FXML
private TableView<Employee> selectEmployeeTable;
#FXML
private TableColumn<Employee, String> employeeNameColumn;
#FXML
private TableColumn<Employee, Boolean> checkBoxColumn;
private PayrollMainApp mainApp;
public EmployeeOverviewController() {
}
#FXML
public void initialize() {
checkBoxColumn.setCellValueFactory(cellData -> cellData.getValue().checkedBoxProperty());
checkBoxColumn.setCellFactory(param -> new CheckBoxTableCell<Employee, Boolean>());
employeeNameColumn.setCellValueFactory(cellData -> cellData.getValue().employeeNameProperty());
}
public void setMainApp(PayrollMainApp mainApp){
this.mainApp = mainApp;
//Add observable list data to the table
selectEmployeeTable.setItems(mainApp.getSelectEmployeeTable());
}
}
And a util class to make the checkBox visible in the table:
SelectBoxCellFactory.java
public class SelectBoxCellFactory implements Callback {
#Override
public TableCell call(Object param) {
CheckBoxTableCell<Employee,Boolean> checkBoxCell = new CheckBoxTableCell();
return checkBoxCell;
}
}
Here is my output thus far:
I know this has a table in it as compared to the previous output. Honestly I'm still indecisive as to use which, because I think using TextFields would make it look better. But all I hope for now is that this design is not impossible to code...
I really hope you can help me... Thank you for your help in advance.

It's probably easiest to use a TableView for the right panel. You can create a FilteredList from your original list:
FilteredList<Employee> selectedEmployees
= new FilteredList<>(selectEmployeeTable, Employee::getSelectBox);
and then use that for your second table.
If you prefer to use text fields (in what looks like a GridPane?) you can still use the filtered list above, but you will need to register a listener with it and update the layout "by hand" when items are added and removed.

Related

I'm trying to perform a search on my recycler adapter when onQueryTextChange gives error to make filter as static in adapter

This is my activity_course_details.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".CourseDetails">
<SearchView
android:id="#+id/search"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:iconifiedByDefault="false">
<requestFocus />
</SearchView>
<!--Recycler view for displaying
our data from Firestore-->
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/idRVCourses"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="50dp" />
<!--Progress bar for showing loading screen-->
<ProgressBar
android:id="#+id/idProgressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true" />
</RelativeLayout>
CoursesDetails.java
public class CourseDetails extends AppCompatActivity implements
SearchView.OnQueryTextListener{
// creating variables for our recycler view,
// array list, adapter, firebase firestore
// and our progress bar.
private RecyclerView courseRV;
private ArrayList<Courses> coursesArrayList;
private CourseRVAdapter courseRVAdapter;
private FirebaseFirestore db;
ProgressBar loadingPB;
SearchView editsearch;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_course_details);
editsearch = (SearchView) findViewById(R.id.search);
editsearch.setOnQueryTextListener((SearchView.OnQueryTextListener) this);
// initializing our variables.
courseRV = findViewById(R.id.idRVCourses);
loadingPB = findViewById(R.id.idProgressBar);
// initializing our variable for firebase
// firestore and getting its instance.
db = FirebaseFirestore.getInstance();
// creating our new array list
coursesArrayList = new ArrayList<>();
courseRV.setHasFixedSize(true);
courseRV.setLayoutManager(new LinearLayoutManager(this));
// adding our array list to our recycler view adapter class.
courseRVAdapter = new CourseRVAdapter(coursesArrayList, this);
// setting adapter to our recycler view.
courseRV.setAdapter(courseRVAdapter);
// below line is use to get the data from Firebase Firestore.
// previously we were saving data on a reference of Courses
// now we will be getting the data from the same reference.
db.collection("Courses").get()
.addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
#SuppressLint("NotifyDataSetChanged")
#Override
public void onSuccess(QuerySnapshot queryDocumentSnapshots) {
// after getting the data we are calling on success method
// and inside this method we are checking if the received
// query snapshot is empty or not.
if (!queryDocumentSnapshots.isEmpty()) {
// if the snapshot is not empty we are
// hiding our progress bar and adding
// our data in a list.
loadingPB.setVisibility(View.GONE);
List<DocumentSnapshot> list = queryDocumentSnapshots.getDocuments();
for (DocumentSnapshot d : list) {
// after getting this list we are passing
// that list to our object class.
Courses c = d.toObject(Courses.class);
// and we will pass this object class
// inside our arraylist which we have
// created for recycler view.
coursesArrayList.add(c);
}
// after adding the data to recycler view.
// we are calling recycler view notifuDataSetChanged
// method to notify that data has been changed in recycler view.
courseRVAdapter.notifyDataSetChanged();
} else {
// if the snapshot is empty we are displaying a toast message.
Toast.makeText(CourseDetails.this, "No data found in Database", Toast.LENGTH_SHORT).show();
}
}
}).addOnFailureListener(new OnFailureListener() {
#Override
public void onFailure(#NonNull Exception e) {
// if we do not get any data or any error we are displaying
// a toast message that we do not get any data
Toast.makeText(CourseDetails.this, "Fail to get the data.", Toast.LENGTH_SHORT).show();
}
});
}
#Override
public boolean onQueryTextSubmit(String query) {
return false;
}
#Override
public boolean onQueryTextChange(String newText) {
String text = newText;
CourseRVAdapter.filter(text);
return false;
}
}
CoursesRVAdapter.java
public class CourseRVAdapter extends RecyclerView.Adapter<CourseRVAdapter.ViewHolder> {
// creating variables for our ArrayList and context
private ArrayList<Courses> coursesArrayList = null;
private Context context;
private ArrayList<Courses> arrayList;
// creating constructor for our adapter class
public CourseRVAdapter(ArrayList<Courses> coursesArrayList, Context context) {
this.coursesArrayList = coursesArrayList;
this.context = context;
this.arrayList = new ArrayList<Courses>();
this.arrayList.addAll(coursesArrayList);
}
#NonNull
#Override
public CourseRVAdapter.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
// passing our layout file for displaying our card item
return new ViewHolder(LayoutInflater.from(context).inflate(R.layout.course_item, parent, false));
}
#Override
public void onBindViewHolder(#NonNull CourseRVAdapter.ViewHolder holder, int position) {
// setting data to our text views from our modal class.
Courses courses = coursesArrayList.get(position);
holder.courseNameTV.setText(courses.getCourseName());
holder.courseDurationTV.setText(courses.getCourseDuration());
holder.courseDescTV.setText(courses.getCourseDescription());
}
#Override
public int getItemCount() {
// returning the size of our array list.
return coursesArrayList.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
// creating variables for our text views.
private final TextView courseNameTV;
private final TextView courseDurationTV;
private final TextView courseDescTV;
public ViewHolder(#NonNull View itemView) {
super(itemView);
// initializing our text views.
courseNameTV = itemView.findViewById(R.id.idTVCourseName);
courseDurationTV = itemView.findViewById(R.id.idTVCourseDuration);
courseDescTV = itemView.findViewById(R.id.idTVCourseDescription);
}
}
#Override
public long getItemId(int position) {
return position;
}
// Filter Class
public void filter(String charText) {
charText = charText.toLowerCase(Locale.getDefault());
coursesArrayList.clear();
if (charText.length() == 0) {
arrayList.addAll(coursesArrayList);
} else {
for (Courses wp : arrayList) {
if (wp.getCourseName().toLowerCase(Locale.getDefault()).contains(charText)) {
coursesArrayList.add(wp);
}
}
}
notifyDataSetChanged();
}
}
Courses.java
public class Courses {
// variables for storing our data.
private String courseName, courseDescription, courseDuration;
public Courses() {
// empty constructor
// required for Firebase.
}
// Constructor for all variables.
public Courses(String courseName, String courseDescription, String courseDuration) {
this.courseName = courseName;
this.courseDescription = courseDescription;
this.courseDuration = courseDuration;
}
// getter methods for all variables.
public String getCourseName() {
return courseName;
}
public void setCourseName(String courseName) {
this.courseName = courseName;
}
public String getCourseDescription() {
return courseDescription;
}
// setter method for all variables.
public void setCourseDescription(String courseDescription) {
this.courseDescription = courseDescription;
}
public String getCourseDuration() {
return courseDuration;
}
public void setCourseDuration(String courseDuration) {
this.courseDuration = courseDuration;
}
}
i dont want to make this classs as static it give me error to uch so icant to amke search option in my android application i cant resolve this issue please help to resolve this issue.
i getting error in CourseRVAdapter.filter(text);
this to make filter as static this filter is make in CoursesRVAdapter public void filter(String charText) {------}
is the classs so what can do for making search option in recyclerview adapter list in android.
and please if you getting any suggesion for me please give me
i appreciating all of the things that you will says to me
thank you so much

Change the View on button Click in WPF MVVM Pattern

I have 3 buttons on one usercontrol (usercontrol1.xaml) in the Window . Now on-click of button 1 ,I want to switch the view to another usercontrol (usercontrol2.xaml), which again have 3 buttons and so on.
How to implement in MVVM Pattern in WPF?
Be aware that im using caliburn micro for this example
private IEventAggregator _eventAggregator => IoC.Get<IEventAggregator>(key: nameof(EventAggregator));
private IWindowManager _windowManager => IoC.Get<IWindowManager>(key: nameof(WindowManager));
public ShellViewModel(IEventAggregator eventAggregator)
{
_eventAggregator.Subscribe(this);
}
public string _firstName;
// public ShellViewModel page = new ShellViewModel();
public string FirstName
{
get {
return _firstName;
}
set
{
_firstName = value;
NotifyOfPropertyChange(() => FirstName);
}
}
public ICommand ConvertTextCommand
{
get { return new DelegateCommand(ConvertText); }
}
void ConvertText()
{
//string url = "https://www.google.com/";
string url = FirstName;
string result;
using (HttpClient client = new HttpClient())
{
using (HttpResponseMessage response = client.GetAsync(url).Result)
{
using (HttpContent content = response.Content)
{
result = content.ReadAsStringAsync().Result;
}
}
}
//(MainWindow)Application.Current.MainWindow).txtForm1TextBox.Text = "Some text";
//Application.Current.Resources.Add("PageSource", result);
// NavigationService.NavigateToViewModel<SecondViewModel>("Hello");
_windowManager.ShowWindow(new PageSourceViewModel(_eventAggregator), null);
_eventAggregator.PublishOnUIThread(result);
}
You can check caliburn micro and see that you can just create a new view model in a window manager instance
here is also 2 links to 2 tutorials that helped me solve this issue for MVVM
https://www.youtube.com/watch?v=laPFq3Fhs8k
https://www.youtube.com/watch?v=9kGcE9thwNw&list=LLy8ROdSzpPJnikdZQ1XPZkQ&index=30&t=0s
the first tutorial will help you to get a general idea. The second will help you with events and you can look back to my code and see how i handled a new window instance.
You can also call the same view model for a new instance of the same window like you said in the question
You will also need to make a boostrapper class. For my example i did it like this.
public class Bootstrapper : BootstrapperBase
{
private readonly SimpleContainer _container =
new SimpleContainer();
public Bootstrapper()
{
Initialize();
}
protected override void Configure()
{
_container.Instance<IWindowManager>(new WindowManager());
_container.Singleton<IEventAggregator, EventAggregator>();
_container.PerRequest<ShellViewModel>();
}
protected override void OnStartup(object sender, StartupEventArgs e)
{
_container.Instance<SimpleContainer>(_container);
_container.Singleton<IWindowManager, WindowManager>(key: nameof(WindowManager))
.Singleton<IEventAggregator, EventAggregator>(key: nameof(EventAggregator));
DisplayRootViewFor<ShellViewModel>();
}
protected override object GetInstance(Type service, string key)
{
return _container.GetInstance(service, key);
}
protected override IEnumerable<object> GetAllInstances(Type service)
{
return _container.GetAllInstances(service);
}
protected override void BuildUp(object instance)
{
_container.BuildUp(instance);
}
}

Data not inserting into the Database room Android

I'm new to android and this is the first time I'm using room in my application. Either insert operation is not performed or the database is not created or any other error.
I don't know what I'm doing wrong so I need your help.
This program is running but No result is displayed. Nothing is showing on the screen.
Here is my code-
please let me know what is wrong in this code and what I should do to correct it.
Car_details.java
#PrimaryKey
#NonNull
#SerializedName("id")
#Expose
private String id;
#SerializedName("name")
#Expose
private String name;
#SerializedName("desc")
#Expose
private String desc;
#SerializedName("image")
#Expose
private String image;
CarDao.java-
#Insert(onConflict = OnConflictStrategy.REPLACE)
void insert(Car_Details car_details);
#Query("Select * from car_table")
LiveData<List<Car_Details>> selectAll();
CarListDatabase.java
private static CarListDatabase instance;
public abstract CarDao carDao();
public static synchronized CarListDatabase getInstance(Context context){
if(instance==null)
{
instance= Room.databaseBuilder(context.getApplicationContext(),
CarListDatabase.class,"Car_database").fallbackToDestructiveMigration()
.build();
}
return instance;
}
CarRepository.java
public void getCarList(){
CarlistInterface carlistInterface= retrofit.create(CarlistInterface.class);
Call<List<Car_Details>> carList= carlistInterface.carList();
carList.enqueue(new Callback<List<Car_Details>>() {
#Override
public void onResponse(Call<List<Car_Details>> call, final Response<List<Car_Details>> response) {
if(response.body() != null){
List<Car_Details> car_details = response.body();
for (int i = 0; i < car_details.size(); i++) {
String id=car_details.get(i).getId();
String names = car_details.get(i).getName();
String desc=car_details.get(i).getDesc();
String image= car_details.get(i).getImage();
Car_Details car = new Car_Details();
car .setId(id);
car .setName(names);
car .setDesc(desc);
car .setImage(image);
new InsertNoteAsyncTask(carDao).execute(car);
}
}
}
});
}
public LiveData<List<Car_Details>> getCarLists(){
return allCarList;
}
private static class InsertNoteAsyncTask extends AsyncTask<Car_Details,Void,Void> {
private CarDao carDao;
private InsertNoteAsyncTask(CarDao carDao){
this.carDao= carDao;
}
#Override
protected Void doInBackground(Car_Details... car_details) {
carDao.insert(car_details[0]);
return null;
}
CarViewModel.java
public CarViewModel(#NonNull Application application) {
super(application);
repository= new CarRepository(application);
carList= repository.getCarLists();
}
public LiveData<List<Car_Details>> getListLiveData() {
return carList;
MainActivity.java
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
repository = new CarRepository(this);
carViewModel = ViewModelProviders.of(this).get(CarViewModel.class);
recyclerView= findViewById(R.id.cars_recyclerView);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
List = new ArrayList<>();
recyclerAdapter = new RecyclerAdapter(List);
recyclerView.setAdapter(recyclerAdapter);
recyclerAdapter = new RecyclerAdapter(List);
recyclerView.setAdapter(recyclerAdapter);
carViewModel.getListLiveData().observe(this, new
Observer<java.util.List<Car_Details>>() {
#Override
public void onChanged(java.util.List<Car_Details> car_details) {
recyclerAdapter.setUserList(List);
}
});
repository.getCarList();
}
RecyclerAdapter.java
public class RecyclerAdapter extends RecyclerView.Adapter {
List<Car_Details> carList= new ArrayList<>();
public RecyclerAdapter(List<Car_Details> carList) {
this.carList = carList;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LayoutInflater layoutInflater= LayoutInflater.from(parent.getContext());
View view= layoutInflater.inflate(R.layout.row_item,parent,false);
return new RecyclerAdapter.ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
holder.car_name.setText(carList.get(position).getName());
holder.car_desc.setText(carList.get(position).getDesc());
}
public void setUserList(List<Car_Details> userList) {
this.carList = userList;
notifyDataSetChanged();
}
#Override
public int getItemCount() {
return carList.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
private TextView car_name,car_desc;
public ViewHolder(#NonNull View itemView) {
super(itemView);
car_name= itemView.findViewById(R.id.car_name);
car_desc= itemView.findViewById(R.id.car_desc);
}
}
}
#Override
public int getItemCount() {
return carList.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
private TextView car_name,car_desc;
public ViewHolder(#NonNull View itemView) {
super(itemView);
car_name= itemView.findViewById(R.id.car_name);
car_desc= itemView.findViewById(R.id.car_desc);
}
}
}
There is nothing wrong with your insert operation with room.
The way you have used live date in your application seems wrong that's why your program is running but no result is coming.
You have to check the part where you are using live data.
Hope this help you out.

How to display data in firestore with recyclerview in frgaments?

I'm new to android programming and I have a problem in displaying data from firestore. I want to display the data in fragments in the navigation drawer. I found tutorials that display it on activities but nothing in fragments. Please help me with this.
public class MainActivity extends AppCompatActivity {
Toolbar toolbar;
DrawerLayout drawerLayout;
ActionBarDrawerToggle actionBarDrawerToggle;
NavigationView navigationView;
FragmentTransaction fragmentTransaction;
private boolean shouldLoadProductFragOnBackPress = false;
public static int navItemIndex = 0;
public FirebaseAuth mAuth;
FirebaseFirestore db = FirebaseFirestore.getInstance();
private void Load_Product_fragment() {
navItemIndex = 0;
fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.maincontainer,new ProductFragment());
fragmentTransaction.commit();
getSupportActionBar().setTitle(R.string.Productfragment_Title);
drawerLayout.closeDrawers();
}
private void Load_Service_fragment(){
navItemIndex = 1;
fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.maincontainer,new ServiceFragment());
fragmentTransaction.commit();
getSupportActionBar().setTitle(R.string.Servicefragmnet_Title);
drawerLayout.closeDrawers();
shouldLoadProductFragOnBackPress = true;
}
private void Load_Account_fragment(){
navItemIndex = 2;
fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.maincontainer,new AccountFragment());
fragmentTransaction.commit();
getSupportActionBar().setTitle(R.string.Accountfragment_Title);
drawerLayout.closeDrawers();
shouldLoadProductFragOnBackPress = true;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar=(Toolbar)findViewById(R.id.Toolbar_Layout);
setSupportActionBar(toolbar);
drawerLayout=(DrawerLayout) findViewById(R.id.Drawer_Layout);
actionBarDrawerToggle = new ActionBarDrawerToggle(this,drawerLayout,toolbar,R.string.drawer_open,R.string.drawer_close);
drawerLayout.addDrawerListener(actionBarDrawerToggle);
drawerLayout.openDrawer(Gravity.LEFT);
Load_Product_fragment();
navigationView= findViewById(R.id.Navigation_View);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch (item.getItemId())
{
case R.id.Productsfragment_ND:
Load_Product_fragment();
item.setChecked(true);
break;
case R.id.Servicefragment_ND:
Load_Service_fragment();
item.setChecked(true);
break;
case R.id.Accountfragemnt_ND:
Load_Account_fragment();
item.setChecked(true);
break;
}
return false;
}
});
}
#Override
public void onBackPressed() {
if (drawerLayout.isDrawerOpen(GravityCompat.START)) {
drawerLayout.closeDrawers();
return;
}
// This code loads home fragment when back key is pressed
// when user is in other fragment than home
if (shouldLoadProductFragOnBackPress) {
// checking if user is on other navigation menu
// rather than home
if (navItemIndex !=0) {
navItemIndex = 0;
shouldLoadProductFragOnBackPress = false;
Load_Product_fragment();
return;
}
}
super.onBackPressed();
}
#Override
protected void onPostCreate(#Nullable Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
actionBarDrawerToggle.syncState();
}
public void del(View view) {db.collection("products").document("test")
.delete()
.addOnSuccessListener(new OnSuccessListener<Void>() {
#Override
public void onSuccess(Void aVoid) {
}
})
.addOnFailureListener(new OnFailureListener() {
#Override
public void onFailure(#NonNull Exception e) {
}
});
}
}
This is my main-activity.It contains the requirements for a navigation drawer for 3 fragments.I have a Firestore database linked to the app. I need to display the contents of the database in these fragments.
Next i will show one fragment and the recyclerview adapter and view holder i have tried using.
I am not sure if it is the correct way to do it.Please help me with this
public class ProductFragment extends Fragment {
private static final String TAG = ProductFragment.class.getSimpleName();
private RecyclerView recipeRecyclerview;
private LinearLayoutManager linearLayoutManager;
private Product_adapter mAdapter;
private DatabaseReference mDatabaseRef;
private DatabaseReference childRef;
public ProductFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate (R.layout.fragment_product, container, false);
getActivity().setTitle(getString(R.string.Productfrag_title));
linearLayoutManager = new LinearLayoutManager(getActivity());
recipeRecyclerview = view.findViewById(R.id.List_recycleview);
recipeRecyclerview.setHasFixedSize(true);
mDatabaseRef = FirebaseDatabase.getInstance().getReference();
childRef = mDatabaseRef.child("recipes");
mAdapter = new Product_adapter(Product_response.class, R.layout.list_layout, View_holder.class, childRef, getContext());
recipeRecyclerview.setLayoutManager(linearLayoutManager);
recipeRecyclerview.setAdapter(mAdapter);
return view;
}
}
This is my products-fragment. I have tried to add the recycler view.
Adapter
public class Product_adapter extends RecyclerView.Adapter {
FirebaseFirestore db = FirebaseFirestore.getInstance();
private Context context;
Query query = db.collection("products");
FirestoreRecyclerOptions<Product_response> response = new FirestoreRecyclerOptions.Builder<Product_response>()
.setQuery(query, Product_response.class)
.build();
FirestoreRecyclerAdapter adapter = new FirestoreRecyclerAdapter<Product_response, View_holder>(response) {
#Override
protected void onBindViewHolder(View_holder holder, int position, Product_response model) {
}
#Override
public View_holder onCreateViewHolder(ViewGroup group, int i) {
// Create a new instance of the ViewHolder, in this case we are using a custom
// layout called R.layout.message for each item
View view = LayoutInflater.from(group.getContext())
.inflate(R.layout.list_layout, group, false);
return new View_holder(view);
}
};
public Product_adapter(Class<Product_response> product_responseClass, int list_layout, Class<View_holder> view_holderClass, DatabaseReference childRef, Context context) {
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return null;
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
}
#Override
public int getItemCount() {
return 0;
}
}
View holder
public class View_holder extends RecyclerView.ViewHolder{
private static final String TAG = View_holder.class.getSimpleName();
public TextView main_text, subtext ;
public ImageView image;
public View_holder(View itemView) {
super(itemView);
main_text = (TextView)itemView.findViewById(R.id.List_maintext);
subtext = (TextView)itemView.findViewById(R.id.List_subtext);
image = (ImageView)itemView.findViewById(R.id.List_imageview);
}
}
Next i will show the response page where i used the getter and setter for the firebase
import com.google.firebase.firestore.IgnoreExtraProperties;
#IgnoreExtraProperties
public class Product_response {
private String Product;
private String Cost;
public Product_response() {
}
public Product_response(String Product, String Cost){
this.Product= Product;
this.Cost= Cost;
}
public String getProduct() {
return Product;
}
public void setProduct(String Product) {
this.Product = Product;
}
public String getCost(){
return Cost;
}
public void setCost(String Cost)
{
this.Cost = Cost;
}
}
This is how my database looks like. I need to display this products in my fragment
This is the github link of the app. Please help me complete this

Accessing XML Image Array within an ImageAdapter

My question is very similar to this thread, however it was never properly answered.
I have an ImageAdapter setup as so;
public class ImageAdapter extends BaseAdapter {
private Context mContext;
int[] mImages;
public ImageAdapter(Context c, int[] images) {
mContext = c;
mImages = images;
}
#Override
public int getCount() {
return 0;
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) {
// if it's not recycled, initialize some attributes
imageView = new ImageView(mContext);
imageView.setLayoutParams(new GridView.LayoutParams(200, 200));
} else {
imageView = (ImageView) convertView;
}
imageView.setImageResource(mImages[position]);
return imageView;
}
}
And I want the images to be from an XML;
<integer-array name="images">
<item>#drawable/image1</item>
<item>#drawable/image2</item>
<item>#drawable/image3</item>
</integer-array>
In my MainActivity class I have tried to get the image array and pass it into the ImageAdapter but I can't;
public class MainActivity extends AppCompatActivity {
private int images[] = getResources().getIntArray(R.array.images);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
GridView gridview = (GridView) findViewById(R.id.gridView);
gridview.setAdapter(new ImageAdapter(MainActivity.this, images));
}
}
I am currently getting an error message:
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
with my app crashing on load up. I want to make my ImageAdapter display images from an XML in my GridView.
try to use
private int images[] = {R.drawable.image1, R.drawable.image3, R.drawable.image3};
instead of
private int images[] = getResources().getIntArray(R.array.images);

Resources