填充列表视图时遇到问题。我想我知道是什么问题，因为我多次测试它，似乎检索我的数据的路径实际上是用户存储而不是赌注，但我似乎没有得到路径来自哪里。我回头看看这些方法，看起来路径就是DatabaseReference，尽管我在类中的引用只是标准的
mDatabase = FirebaseDatabase.getInstance().getReference();
这是我的适配器
public class CustomAdapter extends BaseAdapter{
Context c;
ArrayList<Bets> bets;
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser(); //Getting currently logged user
DatabaseReference mDatabase;
String hours;
String samount;
public CustomAdapter(Context c, ArrayList<Bets> bets) {
this.c = c;
this.bets = bets;
}
@Override
public int getCount() {
return bets.size();
}
@Override
public Object getItem(int pos) {
return bets.get(pos);
}
@Override
public long getItemId(int itemid) {
return itemid;
}
@Override
public View getView(int position, View view, ViewGroup viewGroup) {
if(view == null)
{
view = LayoutInflater.from(c).inflate(R.layout.item_layout,viewGroup,false);
}
TextView condition = (TextView) view.findViewById(R.id.conditionList);
TextView place = (TextView) view.findViewById(R.id.placeList);
TextView amount = (TextView) view.findViewById(R.id.amountList);
final Bets bet = (Bets) this.getItem(position);
condition.setText(bet.getCondition());
place.setText(bet.getPlace());
String setamount = String.valueOf(bet.getAmount());
amount.setText(setamount);
hours = String.valueOf(bet.getHours());
samount = String.valueOf(bet.getAmount());
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
openDetailList(bet.getCreator(),bet.getCondition(),bet.getPlace(),hours,samount,bet.getJoined(),bet.getCreatorUid(),bet.getJoinedUid());
}
});
return view;
}
public void openDetailList(String...details)
{
Intent i = new Intent(c, ListDetail.class);
i.putExtra("CREATOR_KEY",details[0]);
i.putExtra("CONDITION_KEY",details[1]);
i.putExtra("PLACE_KEY",details[2]);
i.putExtra("HOURS_KEY",details[3]);
i.putExtra("AMOUNT_KEY",details[4]);
i.putExtra("JOINED_KEY",details[5]);
i.putExtra("CREATORUID_KEY",details[6]);
i.putExtra("JOINEDUID_KEY",details[7]);
c.startActivity(i);
}
}
这是我的FirebaseHelper
public class FirebaseHelper {
DatabaseReference db;
Boolean saved = null;
ArrayList<Bets> bets = new ArrayList<>();
public FirebaseHelper(DatabaseReference db) {
this.db = db;
}
public Boolean save(Bets bets)
{
if(bets == null)
{
saved = false;
}
else {
try {
db.child("bets").push().setValue(bets);
saved = true;
} catch (DatabaseException e) {
e.printStackTrace();
saved = false;
}
}
return saved;
}
private void fetchData(DataSnapshot dataSnapshot)
{
bets.clear();
for(DataSnapshot snapshot: dataSnapshot.getChildren())
{
Bets bet = snapshot.getValue(Bets.class);
bets.add(bet);
}
}
public ArrayList<Bets> retrieve()
{
db.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
fetchData(dataSnapshot);
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
fetchData(dataSnapshot);
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
Log.e(TAG, "onComplete: Failed=" + databaseError);
}
});
return bets;
}
}
保存/插入数据的效果非常好，因为我添加了一个赌注后，我甚至会有一个示例数据显示，但它没有填充数据。
{
"bets" :
{
"-LAzYM9SA-8Sg0YgGqnv" :
{
"amount" : 10,
"condition" : "It will be sunny",
"creator" : "Ginart",
"creatorUid" : "MxQPvCjUIkahVSZk1y2stdCxeY32",
"hours" : 2,
"joined" : "Free",
"joinedUid" : "",
"place" : "New York"
}
出于某种原因，我认为它会读取此处的用户数据
"users" : {
"EbYtfLUPs7Vu2rvnExaOaqJ4J883" : {
"balance" : 5,
"bets" : 1
},
每次添加新用户时，列表视图都会在我的列表中添加一个项目，但我的模板根本没有数据，Android Studio会向我显示
W/ClassMapper: No setter/field for balance found on class Models.Bets
W/ClassMapper: No setter/field for bets found on class Models.Bets
所以我认为这些路径一定是错的。我的投注模型没有平衡和投注变量。
这是我的OnCreate方法，我在firebase中使用retrieve（）方法
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_logged_in);
Money = (EditText) findViewById(R.id.Balance);
User = (EditText) findViewById(R.id.Player);
betList = (ListView) findViewById(R.id.BetList);
addbet = (FloatingActionButton) findViewById(R.id.AddBet);
addcreds = (TextView) findViewById(R.id.addCredits);
Money.setInputType(0);
User.setInputType(0);
betting = FirebaseDatabase.getInstance().getReference();
mDatabase = FirebaseDatabase.getInstance().getReference();
helper = new FirebaseHelper(betting);
mDatabase.child("users").child(current.getUid().toString()).child("balance").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.
balance = dataSnapshot.getValue(Long.class);
String b = String.valueOf(balance);
Money.setText(b);
}
@Override
public void onCancelled(DatabaseError error) {
Money.setText("Error");
}
});
mDatabase.child("users").child(current.getUid().toString()).child("bets").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.
bets = dataSnapshot.getValue(Long.class);
}
@Override
public void onCancelled(DatabaseError error) {
}
});
User.setText(current.getDisplayName().toString());
//ADAPTER
adapter = new CustomAdapter(this,helper.retrieve());
betList.setAdapter(adapter);
addbet.setOnClickListener(this);
addcreds.setOnClickListener(this);
}
此外，每当我试图改变我对
的引用时betting = FirebaseDatabase.getInstance().getReference().child("bets");
我收到此错误
E/AndroidRuntime: FATAL EXCEPTION: main
Process: app.betme.betme, PID: 22814
com.google.firebase.database.DatabaseException: Can't convert object of type java.lang.Long to type Models.Bets
at com.google.android.gms.internal.zg.zzb(Unknown Source)
at com.google.android.gms.internal.zg.zza(Unknown Source)
at com.google.firebase.database.DataSnapshot.getValue(Unknown Source)
at Utils.FirebaseHelper.fetchData(FirebaseHelper.java:67)
at Utils.FirebaseHelper.access$000(FirebaseHelper.java:21)
at Utils.FirebaseHelper$1.onChildAdded(FirebaseHelper.java:81)
at com.google.android.gms.internal.px.zza(Unknown Source)
at com.google.android.gms.internal.vj.zzHX(Unknown Source)
at com.google.android.gms.internal.vp.run(Unknown Source)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
答案 0 :(得分：0)
这不是错误，只是来自Firebase，你应该有方法为balance和bets设置数据