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
