我将我的应用程序连接到Firestore，并且我有一个名为timey的字符串，这是一个被选中的日期（无关的方式），并与Firestore文档中的字符串timey进行比较。
我成功地让应用程序将Firestore输出显示为TextView，但如果我有2个具有相同日期的条目，则它总是选择一个并忘记另一个。所以我决定尝试使用FirebaseRecyclerAdapter显示数据，显示＆＃34;单日期条目＆＃34;通常情况下，但只要我选择包含2个条目的日期，它就会崩溃应用程序。这里是源代码，任何想法如何让RecyclerView显示数十个具有相同日期的条目，并将它们作为单独的条目放在RecyclerView中？
... passedArg是从不同布局传递的日期。
static String passedArg;
RecyclerView reserveList;
private static final CollectionReference reservationCollection = FirebaseFirestore.getInstance().collection("reservations");
private static Query reservationsQuery;
private FirebaseFirestore db;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_page);
textView = findViewById(R.id.textView);
textView2 = findViewById(R.id.textView2);
textView3 = findViewById(R.id.textView3);
passedArg = getIntent().getExtras().getString(MESSAGE_KEY);
textView.setText(passedArg);
reservationsQuery = reservationCollection.whereEqualTo("timey", passedArg);
RecyclerView reserveList = (RecyclerView) findViewById(R.id.reserveList);
reserveList.setLayoutManager(new LinearLayoutManager (this));
FirestoreRecyclerOptions<Reservations> options =
new FirestoreRecyclerOptions.Builder<Reservations>()
.setQuery(reservationsQuery, Reservations.class)
.setLifecycleOwner(this)
.build();
FirestoreRecyclerAdapter<Reservations, ReservationsHolder> adapter = new FirestoreRecyclerAdapter<Reservations, ReservationsHolder>(options) {
@Override
protected void onBindViewHolder(@NonNull ReservationsHolder holder, int position, @NonNull Reservations model) {
holder.setName(model.getName());
holder.setTime(model.getTime());
holder.setCountry(model.getCountry());
}
@NonNull
@Override
public ReservationsHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
return new ReservationsHolder(LayoutInflater.from(parent.getContext())
.inflate(R.layout.reservations, parent, false));
}
};
reserveList.setAdapter(adapter);
如果您需要更多代码，请与我们联系。
编辑：崩溃日志：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.nedim.calendar1, PID: 10342
java.lang.RuntimeException: Could not deserialize object. Failed to convert value of type java.util.Date to String (found in field 'time')
at com.google.android.gms.internal.firebase-firestore.zzko.zzb(Unknown Source)
at com.google.android.gms.internal.firebase-firestore.zzko.zza(Unknown Source)
at com.google.android.gms.internal.firebase-firestore.zzko.zza(Unknown Source)
at com.google.android.gms.internal.firebase-firestore.zzko.zzb(Unknown Source)
at com.google.android.gms.internal.firebase-firestore.zzko$zza.zza(Unknown Source)
at com.google.android.gms.internal.firebase-firestore.zzko.zza(Unknown Source)
at com.google.android.gms.internal.firebase-firestore.zzko.zza(Unknown Source)
at com.google.firebase.firestore.DocumentSnapshot.zza(Unknown Source)
at com.google.firebase.firestore.QueryDocumentSnapshot.zza(Unknown Source)
at com.google.firebase.firestore.DocumentSnapshot.toObject(Unknown Source)
at com.google.firebase.firestore.QueryDocumentSnapshot.toObject(Unknown Source)
at com.firebase.ui.firestore.ClassSnapshotParser.parseSnapshot(ClassSnapshotParser.java:23)
at com.firebase.ui.firestore.ClassSnapshotParser.parseSnapshot(ClassSnapshotParser.java:12)
at com.firebase.ui.common.BaseCachingSnapshotParser.parseSnapshot(BaseCachingSnapshotParser.java:35)
at com.firebase.ui.common.BaseObservableSnapshotArray.get(BaseObservableSnapshotArray.java:52)
at com.firebase.ui.firestore.FirestoreRecyclerAdapter.getItem(FirestoreRecyclerAdapter.java:83)
at com.firebase.ui.firestore.FirestoreRecyclerAdapter.onBindViewHolder(FirestoreRecyclerAdapter.java:125)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:6673)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:6714)
at android.support.v7.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:5647)
at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5913)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5752)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5748)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2232)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1559)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1519)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:614)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3812)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3529)
at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:4082)
at android.view.View.layout(View.java:17572)
at android.view.ViewGroup.layout(ViewGroup.java:5656)
at android.support.constraint.ConstraintLayout.onLayout(ConstraintLayout.java:1855)
at android.view.View.layout(View.java:17572)
at android.view.ViewGroup.layout(ViewGroup.java:5656)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:17572)
at android.view.ViewGroup.layout(ViewGroup.java:5656)
at android.support.v7.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:443)
at android.view.View.layout(View.java:17572)
at android.view.ViewGroup.layout(ViewGroup.java:5656)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:17572)
at android.view.ViewGroup.layout(ViewGroup.java:5656)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:17572)
at android.view.ViewGroup.layout(ViewGroup.java:5656)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at com.android.internal.policy.DecorView.onLayout(DecorView.java:755)
at android.view.View.layout(View.java:17572)
at android.view.ViewGroup.layout(ViewGroup.java:5656)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2429)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2149)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1306)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6579)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:871)
at android.view.Choreographer.doCallbacks(Choreographer.java:683)
at android.view.Choreographer.doFrame(Choreographer.java:619)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:857)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6316)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:872)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:762)
W/Firestore: (0.6.6-dev) [OnlineStateTracker]: Could not reach Firestore backend.
答案 0 :(得分：1)
您收到以下错误：
java.lang.RuntimeException: Could not deserialize object. Failed to convert value of type java.util.Date to String (found in field 'time')
因为在您的Firestore数据库中，您有一个名为time的属性，其类型为Date而不是String。因此，要解决此问题，请参阅how you can store the server timestamp in a Firestore database以及如何正确format。
如果您有兴趣， this 是如何从Cloud Firestore数据库正确检索数据并使用RecyclerView在FirestoreRecyclerAdapter中显示的。 / p>