How would I achieve the retrieval of account based arrays, Currently when I run the following code it doesn't retrieve anything. I'm a complete beginner and I tried looking at other examples but mine are different to others. My goal is to retrieve all the arrays belonging to that user. For now I just want to return the names of these items but later I want to to use the array also, So the first user would have:
Fruit = ["apple", "banana", "mango" ]
Veg = ["tomato", "potato", "cabbage" ]
Code:
public class HomeActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener{
private ZXingScannerView scannerView;
private final int permission_code = 1;
String [] selectedProfile;
Spinner spinner;
ArrayAdapter<CharSequence> adapter;
ListView lvProfiles;
private String userID;
private FirebaseDatabase mFirebaseDatabase;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
private DatabaseReference myRef;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
mAuth = FirebaseAuth.getInstance();
mFirebaseDatabase = FirebaseDatabase.getInstance();
myRef = mFirebaseDatabase.getReference();
FirebaseUser user = mAuth.getCurrentUser();
userID = user.getUid();
if(mAuth.getCurrentUser() == null){
finish();
startActivity(new Intent(this, MainActivity.class));
}
startSpinner();
lvProfiles = (ListView)findViewById(R.id.lvProfiles);
myRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
// This method is called once with the initial value and again
// whenever data at this location is updated.
showData(dataSnapshot);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
private void showData(DataSnapshot dataSnapshot) {
for(DataSnapshot ds : dataSnapshot.getChildren()){
String x = ds.child("users").child(userID).getValue(String.class);
ArrayList<String> array = new ArrayList<>();
array.add(x);
ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1,array);
lvProfiles.setAdapter(adapter);
}
}
My database looks like so:
{
"users" : {
"9kV3otdvOXU0CGMZWIIxggrBrj63" : {
"Fruit" : [ "apple", "banana", "mango" ],
"Veg" : [ "tomato", "potato", "cabbage" ]
},
"FKazRnUjrzMuQs6dbeIIGaGju5W2" : {
"Gluten" : [ "123", "456", "789" ]
},
"xaLZIfNudthJ8BuY6WBqYrrYPsA2" : {
"Berries" : [ "strawberry", "raspberry", "blackberry", "blueberry", "gooseberry" ],
"Cheese" : [ "feta", "mozzarella", "cheddar" ],
"Kiwi" : [ "kiwi" ]
}
}
}
Update: I changed as you suggested but "fruit" and "veg" don't appear in the spinner, could you suggest anything? here is the new code.
private void showData(DataSnapshot dataSnapshot) {
Map<String,Object> map = dataSnapshot.child("users").child(userID).getValue(Map.class);
ArrayList<String> array = new ArrayList<>();
for (Map.Entry<String,Object> entry : map.entrySet()) {
// key contains "Fruit" or "Veg"
String key = entry.getKey();
// value is the corresponding list
Object value = entry.getValue();
array.addAll((ArrayList) value);
}
ArrayAdapter adapterUser = new ArrayAdapter(this,android.R.layout.simple_list_item_1,array);
spinnerUser.setAdapter(adapterUser);
}
Rules:
{
"rules": {
"users": {
"$uid": {
".read": "$uid === auth.uid",
".write": "$uid === auth.uid"
}
}
}
}
