im试图为一个时间紧迫的大学项目开发一个应用程序（因此，为乱码表示歉意），此特定活动的功能之一是，当用户从微调器中选择一个id时，文档将被加载到屏幕供他们查看。但是，微调器无法识别onItemSelected方法，并且没有任何运行，Log.d也不会扩展，因此不会启动该方法。没有崩溃。
public class Manage extends AppCompatActivity implements AdapterView.OnItemSelectedListener {
...
...
//The following class is initiating the on item selected viewer for the navigation bar to use to read inputs.
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
//If "Request" is clicked, opens the request activity.
case R.id.navigation_Request:
Intent requestIntent = new Intent(Manage.this, Request.class);
Manage.this.startActivity(requestIntent);
return true;
//If "Search" is clicked, opens the search activity.
case R.id.navigation_Search:
Intent searchIntent = new Intent(Manage.this, Search.class);
Manage.this.startActivity(searchIntent);
return true;
//if "Manage" is clicked, do nothing, as the manage activity is already open.
case R.id.navigation_Manage:
return true;
//If "Premium" is clicked, opens the Premium activity.
case R.id.navigation_Premium:
Intent premiumIntent = new Intent(Manage.this, Premium.class);
Manage.this.startActivity(premiumIntent);
return true;
//If "Quit" is clicked, opens an alert box to ask if the user is sure they wish to quit
//If "Yes" is clicked, the app closes. If "No" is clicked, the alert box closes.
case R.id.navigation_Quit:
new AlertDialog.Builder(Manage.this)
.setMessage("Are you sure you wish to quit?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
moveTaskToBack(true);
finish();
}
})
.setNegativeButton("No", null)
.show();
}
return false;
}
};
//When the activity is opened,the navigation bar is initiated, and its population is called.
//The "Manage" part of the navigation bar is also set to be highlighted, as this is the users current activity.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_manage);
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
navigation.setSelectedItemId(R.id.navigation_Manage);
cloudstorage = FirebaseFirestore.getInstance();
mAuth = FirebaseAuth.getInstance();
spnTrades = findViewById(R.id.spnType);
editDesc = findViewById(R.id.editDesc);
editLocation = findViewById(R.id.editLocation);
editPhone = findViewById(R.id.editPhone);
quoteImageButton = findViewById(R.id.imgQuote2);
quotelist = findViewById(R.id.spnQuoteList);
populatespinnerarray();
populatespinner();
}
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int position, long id) {
Log.d(TAG, "Selected item recognised");
String selectedquote = quotelist.getItemAtPosition(position).toString();
FirebaseUser user = mAuth.getCurrentUser();
String uid = user.getUid();
cloudstorage.collection("quotes")
.whereEqualTo("PhotoID", selectedquote)
.get()
.addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
@Override
public void onComplete(@NonNull Task<QuerySnapshot> task) {
if (task.isSuccessful()) {
for (QueryDocumentSnapshot document : task.getResult()) {
if (document != null && document.exists()) {
descfinal = document.getString("Description");
typefinal = document.getString("Trade");
phonefinal = document.getString("Phone");
locationfinal = document.getString("Location");
loadquoteinfo();
}
}
}
}
});
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
Log.d(TAG,"Nope.");
}
public void populatespinnerarray() {
FirebaseUser user = mAuth.getCurrentUser();
String uid = user.getUid();
cloudstorage.collection("quotes")
.whereEqualTo("UserID", uid )
.get()
.addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
@Override
public void onComplete(@NonNull Task<QuerySnapshot> task) {
if (task.isSuccessful()) {
for (QueryDocumentSnapshot document : task.getResult()) {
if (document != null && document.exists()) {
queryid = document.getString("PhotoID");
quoteArray.add(queryid);
Log.d(TAG,"Line" +queryid+"added");
}
}
} else {
Log.d(TAG, "Error populating spinner: ", task.getException());
}
}
});
}
public void populatespinner() {
adapter = new ArrayAdapter<String>(Manage.this,android.R.layout.simple_spinner_item, quoteArray);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
quotelist.setAdapter(adapter);
}
public void loadquoteinfo() {
editDesc.setText(descfinal);
editPhone.setText(phonefinal);
editLocation.setText(locationfinal);
if (typefinal == "Auto-Mechanic") {
tradefinalpos = 1;
spnTrades.setSelection(1);
}
else if (typefinal == "Roof Repair") {
tradefinalpos = 2;
spnTrades.setSelection(2);
}
else if (typefinal == "Carpentry") {
tradefinalpos = 3;
spnTrades.setSelection(3);
}
else if (typefinal == "Landscaping") {
tradefinalpos = 4;
spnTrades.setSelection(4);
}
else if (typefinal == "Decorating") {
tradefinalpos = 5;
spnTrades.setSelection(5);
}
else if (typefinal == "Plumbing") {
tradefinalpos = 6;
spnTrades.setSelection(6);
}
else if (typefinal == "Electrical") {
tradefinalpos = 7;
spnTrades.setSelection(7);
}
else if (typefinal == "Odd Jobs") {
tradefinalpos = 8;
spnTrades.setSelection(8);
}
}
}
答案 0 :(得分：0)
尝试在spinner.setOnItemSelectedListener(this);方法的末尾添加populatespinner()，其中“ spinner” 是要设置监听器的旋转器。
这告诉微调框使用您创建的侦听器。