I am creating an android app that uses Cloud Firestore. There is a document in the database containing names that I need to show on the android app. The problem is that while the Spinner widget I am using is populating correctly, the widget does not show the selected text
I have already tried changing the background and text color of the spinner to no avail( Spinner does not show selected value )
Spinner XML:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="168dp"
android:layout_marginBottom="416dp"
android:onClick="loginButton"
android:text="Login"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
<Spinner
android:id="@+id/spinner"
android:layout_width="291dp"
android:layout_height="55dp"
android:layout_marginEnd="60dp"
android:layout_marginBottom="304dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
</android.support.constraint.ConstraintLayout>
Java Code:
public class MainActivity extends AppCompatActivity{
List<String> names;
Spinner spinner;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
spinner = findViewById(R.id.spinner);
names = new ArrayList<String>();
FirebaseFirestore db = FirebaseFirestore.getInstance();
db.collection("Investors").document("InvestorNames").get().addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {
@Override
public void onSuccess(DocumentSnapshot documentSnapshot) {
Map<String, Object> map = documentSnapshot.getData();
for(Map.Entry<String, Object> entry: map.entrySet()){
names.add((String)entry.getValue());
}
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
}
});
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, names);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(dataAdapter);
}
The Actual Output: Once value is selected from spinner, it shows nothing, no text appears
The Expected Behaviour: Once value from spinner is selected, the spinner should show the selected text
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener {
spinner.setOnItemSelectedListener(this);
// Spinner Drop down elements
**Populate your List Here**
List<String> categories = new ArrayList<String>();
categories.add('');
// Creating adapter for spinner
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, categories);
// Drop down layout style - list view with radio button
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
spinner.setAdapter(dataAdapter);
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
// On selecting a spinner item
String item = parent.getItemAtPosition(position).toString();
view.setSelection(int)
// Showing selected spinner item
Toast.makeText(parent.getContext(), "Selected: " + item, Toast.LENGTH_LONG).show();
}
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
ArrayList<String> routes = new ArrayList<String>();
// routes filled with values at runtime
...
ArrayAdapter<String> aa = new ArrayAdapter<String>(GOFdroid.this, android.R.layout.simple_spinner_item, routes);
aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
Spinner destSpinner = (Spinner) dialogView.findViewById(R.id.edit_event_destination);
String dest = events.get(pos).getDestination();
int routesPos = routes.indexOf(dest);
Log.d(TAG, "Dest: " + dest + ", pos: " + routesPos);
destSpinner.setAdapter(aa);
destSpinner.setSelection(routesPos);
Try changing the width
and height
of the spinner to wrap_content
like this...
android:layout_width="wrap_content"
android:layout_height="wrap_content"
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