我正在创建一个使用Cloud Firestore的android应用。数据库中有一个文档,其中包含我需要在android应用上显示的名称。问题是当我正在使用的Spinner小部件正确填充时,该小部件不会显示所选文本
我已经尝试将微调器的背景和文本颜色更改为无效(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代码:
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);
}
实际输出: 从微调器中选择了值后,它什么也不显示,没有文本出现
预期的行为: 选择了微调框的值后,微调框应显示所选文本
答案 0 :(得分:0)
async function GetData() {
for (var i = 1; i <= 5; i++) {
try {
var data = await this.sheetsService.spreadsheets.values.get({
spreadsheetId,
range
});
return data;
} catch (err) {
if (err.code === 429) {
console.log("Too many requests, try again in 100sek");
await sleep(100000); //sleep function with 100sek
continue;
}
}
}
}
答案 1 :(得分:0)
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);
答案 2 :(得分:0)
尝试像这样将微调器的page 1
和width
更改为height
...
wrap_content