所以我的问题是，当我添加新项目时，它会添加到单个用户下的firebase数据库中，但是当我尝试在同一用户下添加新项目时，它将添加到数据库中，但不会显示在适配器由于某种原因 另外，它说user.getUid，这意味着它应该对用户是私有的，只有该用户才能看到它，但是当我尝试与另一个用户一起输入时，即使不是他的项目，我仍然可以看到该项目。 我的目标是：我希望每个用户都有自己的私人物品，而其他用户则不应看到这些物品，而只能看到自己的私人物品。
以下是数据在数据库中的显示方式：
users
user
jnMqdr8iLAXSrv9xfsmW7E8WmLS2
-Lc7aYrmqc9EiXCL6F1V
color: key
"1" value
model: key
"2o17" value
price: key
1 value
version: key
"1" value
-Lc7aa9nCWcFVkGETFKW
color: key
"1" value
model: key
"2o17" value
price: key
1 value
version: key
"1" value
因此您可以看到这些值已实现，但在适配器内部始终为null。
public class AddActivity extends AppCompatActivity{
private static final Integer Array = 0;
private Spinner spModel;
private EditText etPrice, etVersion, etColor;
private String key;
private FirebaseDatabase database;
private FirebaseUser user;
private FirebaseAuth auth;
private SpecificAdapterManager sam;
private RecyclerView rv;
private DatabaseReference reference;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add);
spModel = (Spinner) findViewById(R.id.spModel);
etVersion = findViewById(R.id.etVersion);
etColor = findViewById(R.id.etColor);
etPrice = findViewById(R.id.etPrice);
rv = findViewById(R.id.rvCars);
database = FirebaseDatabase.getInstance();
reference = database.getReference("users");
auth = FirebaseAuth.getInstance();
key = getIntent().getStringExtra("key");
String model = getIntent().getStringExtra("model");
String version = getIntent().getStringExtra("version");
String color = getIntent().getStringExtra("color");
String price = getIntent().getStringExtra("price");
}
public void onAddClick(View view)
{
String version = etVersion.getText().toString();
final String model = spModel.getSelectedItem().toString();
String color = etColor.getText().toString();
int price = Integer.parseInt(etPrice.getText().toString());
user = auth.getCurrentUser();
final Specific specific = new Specific(version, model, color, price);
String key = reference.push().getKey();
assert key != null;
reference.child("user").child(user.getUid()).child(key).setValue(specific).addOnSuccessListener(new OnSuccessListener<Void>()
{
@Override
public void onSuccess(Void aVoid)
{
Toast.makeText(AddActivity.this, "Car Added Successfully!",
Toast.LENGTH_SHORT).show();
}
});}}
public class FirebaseDBAccess2{
private FirebaseDatabase database;
private DatabaseReference reference;
public FirebaseDBAccess2()
{
database = FirebaseDatabase.getInstance();
reference = database.getReference("users");
}
// Get dataChangeListener to get an object of that type
public void readData(final FirebaseDBAccess2.DataChangeListener dataChangeListener)
{
reference.addValueEventListener(new ValueEventListener()
{
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot)
{
List<String> keys = new ArrayList<>();
List<Specific> specifics = new ArrayList<>();
for (DataSnapshot ds : dataSnapshot.getChildren()) {
String key = ds.getKey();
Specific specific = ds.getValue(Specific.class);
keys.add(key);
specifics.add(specific);
}
dataChangeListener.dataChanged(keys, specifics);
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
{
}
});
}
public void addCar(String key, Specific specific, final FirebaseDBAccess2.DataChangeListener dataChangeListener)
{
reference.child(key).setValue(specific).addOnSuccessListener(new OnSuccessListener<Void>()
{
@Override
public void onSuccess(Void aVoid)
{
dataChangeListener.onAddSuccess();
}
});
}
public void updateCar(String key, Specific specific, final FirebaseDBAccess2.DataChangeListener dataChangeListener)
{
reference.child(key).setValue(specific).addOnSuccessListener(new OnSuccessListener<Void>()
{
@Override
public void onSuccess(Void aVoid)
{
dataChangeListener.onUpdateSuccess();
}
});
}
public void deleteCar(String key, final FirebaseDBAccess2.DataChangeListener dataChangeListener)
{
reference.child(key).setValue(null).addOnSuccessListener(new OnSuccessListener<Void>()
{
@Override
public void onSuccess(Void aVoid)
{
dataChangeListener.onDeleteSuccess();
}
});
}
public interface DataChangeListener
{
void dataChanged(List<String> keys, List<Specific> specifics);
void onUpdateSuccess();
void onDeleteSuccess();
void onAddSuccess();
}
}
public class SpecificCar extends AppCompatActivity
{
private RecyclerView rvCars;
private TextView getBrand;
private FirebaseAuth auth;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_specific_car);
rvCars = findViewById(R.id.rvCars);
getBrand = findViewById(R.id.getBrand);
final SpecificAdapterManager specificAdapterManager = new SpecificAdapterManager(this, rvCars);
new FirebaseDBAccess2().readData(new FirebaseDBAccess2.DataChangeListener()
{
@Override
public void dataChanged(List<String> keys, List<Specific> specifics)
{
specificAdapterManager.notifyDataSetChanged(keys, specifics);
}
@Override
public void onUpdateSuccess()
{
}
@Override
public void onDeleteSuccess()
{
}
@Override
public void onAddSuccess()
{
}
});
auth = FirebaseAuth.getInstance();
//get items for a specific brand from the database
//connect the recycler view with the adapter and send the lists
//if the lists are empty the linear layout will be visible
// else invisible
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.menu_main, menu);
FirebaseUser user = auth.getCurrentUser();
if(user != null)
{
menu.getItem(0).setVisible(true); // new car
menu.getItem(1).setVisible(false); // login / register
menu.getItem(2).setVisible(true); // logoout
}
else
{
menu.getItem(0).setVisible(false); // new car
menu.getItem(1).setVisible(true); // login / register
menu.getItem(2).setVisible(false); // logoout
}
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onPrepareOptionsMenu(Menu menu)
{
FirebaseUser user = auth.getCurrentUser();
if(user != null)
{
menu.getItem(0).setVisible(true); // new car
menu.getItem(1).setVisible(false); // login / register
menu.getItem(2).setVisible(true); // logoout
}
else
{
menu.getItem(0).setVisible(false); // new car
menu.getItem(1).setVisible(true); // login / register
menu.getItem(2).setVisible(false); // logoout
}
return super.onPrepareOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.menuNewCar:
Intent newCar = new Intent(this, AddActivity.class);
startActivity(newCar);
return true;
// case R.id.menuLogin_Register:
// Intent signInIntent = new Intent(this, SignInUpActivity.class);
// startActivity(signInIntent);
// return true;
case R.id.menuLogout:
// logout functionality
auth.signOut();
Intent i = new Intent(SpecificCar.this, MainActivity.class);
startActivity(i);
invalidateOptionsMenu();
return true;
}
return super.onOptionsItemSelected(item);
}
}
public class SpecificAdapterManager
{
private Context context;
private List<String> keys = new ArrayList<>();
private List<Specific> specifics = new ArrayList<>();
private SpecificAdapterManager.CarAdapter adapter = new SpecificAdapterManager.CarAdapter();
private ProgressBar pb;
private FirebaseAuth auth;
public SpecificAdapterManager(Context context, RecyclerView recyclerView)
{
this.context = context;
recyclerView.setAdapter(adapter);
auth = FirebaseAuth.getInstance();
}
public void notifyDataSetChanged(List<String> keys, List<Specific> specifics)
{
this.keys = keys;
this.specifics = specifics;
adapter.notifyDataSetChanged();
}
private class CarAdapter extends RecyclerView.Adapter<CarViewHolder>
{
@NonNull
@Override
public SpecificAdapterManager.CarViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType)
{
LayoutInflater inflater = LayoutInflater.from(context);
View v = inflater.inflate(R.layout.specific_category_list, parent, false);
SpecificAdapterManager.CarViewHolder holder = new SpecificAdapterManager.CarViewHolder(v);
return holder;
}
@Override
public void onBindViewHolder(@NonNull SpecificAdapterManager.CarViewHolder holder, int position)
{
String key = keys.get(position);
Specific specific = specifics.get(position);
holder.bind(specific, key);
}
@Override
public int getItemCount()
{
return specifics.size();
}
}
private class CarViewHolder extends RecyclerView.ViewHolder
{
private String key;
private TextView tvVersion, tvModel, tvColor, tvPrice, getBrand;
private ImageView ivCar;
private ProgressBar pb;
private Button buttonOptions;
private String key1;
public CarViewHolder(@NonNull View v)
{
super(v);
tvVersion = v.findViewById(R.id.tvVersion);
tvModel = v.findViewById(R.id.tvModel);
tvColor = v.findViewById(R.id.tvColor);
tvPrice = v.findViewById(R.id.tvPrice);
ivCar = v.findViewById(R.id.ivCar);
pb = v.findViewById(R.id.progressBar);
getBrand = v.findViewById(R.id.getBrand);
buttonOptions = (Button)itemView.findViewById(R.id.buttonOptions);
buttonOptions.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(auth != null)
{
try {
final PopupMenu popupMenu = new PopupMenu(context, buttonOptions);
popupMenu.getMenuInflater().inflate(R.menu.menu_button, popupMenu.getMenu());
popupMenu.setOnMenuItemClickListener( new PopupMenu.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
switch (item.getItemId())
{
case R.id.remove:
new FirebaseDBAccess2().deleteCar(key, new FirebaseDBAccess2.DataChangeListener()
{
@Override
public void dataChanged(List<String> keys, List<Specific> specifics)
{
}
@Override
public void onUpdateSuccess()
{
Toast.makeText(context, "Car Updated successfully", Toast.LENGTH_SHORT).show();
}
@Override
public void onDeleteSuccess()
{
Toast.makeText(context, "Car Deleted",
Toast.LENGTH_SHORT).show();
}
@Override
public void onAddSuccess()
{
Toast.makeText(context, "Car Added", Toast.LENGTH_SHORT).show();
}
});
return true;
case R.id.update:
Intent updateIntent = new Intent(context, AddUpdateActivity.class);
updateIntent.putExtra("key", key);
updateIntent.putExtra("version", tvVersion.getText().toString());
updateIntent.putExtra("model", tvModel.getText().toString());
updateIntent.putExtra("color", tvColor.getText().toString());
updateIntent.putExtra("price", tvPrice.getText().toString());
context.startActivity(updateIntent);
return true;
}
return true;
}
});
popupMenu.show();
}catch(Exception e)
{
e.printStackTrace();
}
}
}
});
}
public void bind(final Specific specific, final String key)
{
this.key = key;
tvVersion.setText(specific.getVersion());
tvModel.setText(specific.getModel());
tvColor.setText(specific.getColor());
tvPrice.setText(specific.getPrice() + "");
boolean image = new android.os.Handler().postDelayed(
new Runnable()
{
public void run()
{
Picasso.with(context).load(R.drawable.sayarati_logo).into(ivCar);
pb.setVisibility(View.GONE);
}
}, 3000);
if(image == false)
new android.os.Handler().postDelayed(
new Runnable()
{
public void run()
{
Picasso.with(context).load(R.drawable.sayarati_logo).into(ivCar);
pb.setVisibility(View.GONE);
}
}, 3000);
}
}
}