每當我打開 RecyclerView 活動時，應用程序都會停止

Question

每當我嘗試使用回收站視圖打開活動時，我的應用程序都會意外停止。 我嘗試了許多其他方法來在我的活動中添加回收站視圖。但它們都不起作用。 其他活動完美無缺。

Firestore 正在向我的應用程序發送數據，每次我使用回收站視圖運行活動時，數據讀取計數都會增加。

我究竟做錯了什么？

我的 logcat 錯誤

2020-08-13 15:50:12.895 17761-17761/? E/om.example.rus: Unknown bits set in runtime_flags: 0x8000
2020-08-13 15:50:20.355 17761-17761/com.example.rush E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.rush, PID: 17761
    java.lang.RuntimeException: Found two getters or fields with conflicting case sensitivity for property: name
        at com.google.firebase.firestore.util.CustomClassMapper$BeanMapper.addProperty(CustomClassMapper.java:736)
        at com.google.firebase.firestore.util.CustomClassMapper$BeanMapper.<init>(CustomClassMapper.java:640)
        at com.google.firebase.firestore.util.CustomClassMapper.loadOrCreateBeanMapperForClass(CustomClassMapper.java:377)
        at com.google.firebase.firestore.util.CustomClassMapper.convertBean(CustomClassMapper.java:540)
        at com.google.firebase.firestore.util.CustomClassMapper.deserializeToClass(CustomClassMapper.java:253)
        at com.google.firebase.firestore.util.CustomClassMapper.convertToCustomClass(CustomClassMapper.java:100)
        at com.google.firebase.firestore.DocumentSnapshot.toObject(DocumentSnapshot.java:187)
        at com.google.firebase.firestore.QueryDocumentSnapshot.toObject(QueryDocumentSnapshot.java:116)
        at com.google.firebase.firestore.DocumentSnapshot.toObject(DocumentSnapshot.java:165)
        at com.google.firebase.firestore.QueryDocumentSnapshot.toObject(QueryDocumentSnapshot.java:97)
        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:36)
        at com.firebase.ui.common.BaseObservableSnapshotArray.get(BaseObservableSnapshotArray.java:52)
        at com.firebase.ui.firestore.FirestoreRecyclerAdapter.getItem(FirestoreRecyclerAdapter.java:86)
        at com.firebase.ui.firestore.FirestoreRecyclerAdapter.onBindViewHolder(FirestoreRecyclerAdapter.java:158)
        at androidx.recyclerview.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:7065)
        at androidx.recyclerview.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:7107)
        at androidx.recyclerview.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:6012)
        at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6279)
        at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6118)
        at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6114)
        at androidx.recyclerview.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2303)
        at androidx.recyclerview.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1627)
        at androidx.recyclerview.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1587)
        at androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:665)
        at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:4134)
        at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:3851)
        at androidx.recyclerview.widget.RecyclerView.onLayout(RecyclerView.java:4404)
        at android.view.View.layout(View.java:21912)
        at android.view.ViewGroup.layout(ViewGroup.java:6260)
        at androidx.constraintlayout.widget.ConstraintLayout.onLayout(ConstraintLayout.java:1915)
        at android.view.View.layout(View.java:21912)
        at android.view.ViewGroup.layout(ViewGroup.java:6260)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
        at android.view.View.layout(View.java:21912)
        at android.view.ViewGroup.layout(ViewGroup.java:6260)
        at androidx.appcompat.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:530)
        at android.view.View.layout(View.java:21912)
        at android.view.ViewGroup.layout(ViewGroup.java:6260)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
        at android.view.View.layout(View.java:21912)
        at android.view.ViewGroup.layout(ViewGroup.java:6260)
2020-08-13 15:50:20.356 17761-17761/com.example.rush E/AndroidRuntime:     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1829)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1673)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1582)
        at android.view.View.layout(View.java:21912)
        at android.view.ViewGroup.layout(ViewGroup.java:6260)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
        at com.android.internal.policy.DecorView.onLayout(DecorView.java:779)
        at android.view.View.layout(View.java:21912)
        at android.view.ViewGroup.layout(ViewGroup.java:6260)
        at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:3080)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2590)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1721)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7598)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:966)
        at android.view.Choreographer.doCallbacks(Choreographer.java:790)
        at android.view.Choreographer.doFrame(Choreographer.java:725)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:951)
        at android.os.Handler.handleCallback(Handler.java:883)
        at android.os.Handler.dispatchMessage(Handler.java:100)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7356)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

主要活動

   package com.example.rush;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.firebase.ui.firestore.FirestoreRecyclerOptions;
import com.google.firebase.firestore.CollectionReference;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.Query;

public class MainActivity extends AppCompatActivity {
    private FirebaseFirestore db = FirebaseFirestore.getInstance();
    private CollectionReference NameRef = db.collection("TalesSR");
    private TalesAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);



        setUpRecyclerView();

    }
    private void setUpRecyclerView() {
        Query query = NameRef.orderBy("Name", Query.Direction.DESCENDING);
        FirestoreRecyclerOptions<TalesDetails> options = new FirestoreRecyclerOptions.Builder<TalesDetails>()
                .setQuery(query, TalesDetails.class)
                .build();

        adapter = new TalesAdapter(options);

        RecyclerView recyclerView = findViewById(R.id.recyclerview);

        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setAdapter(adapter);
    }

    @Override
    protected void onStart() {
        super.onStart();
        adapter.startListening();
    }

    @Override
    protected void onStop() {
        super.onStop();
        adapter.stopListening();
    }

}

Model Class

public class TalesDetails {

    public TalesDetails(String name) {
        Name = name;
       
    }

    public String Name;

    public String getName() {
        return Name;
    }

    public void setName(String name) {
        Name = name;
    }

    public TalesDetails() {}


   

}

適配器 Class

package com.example.rush;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.firebase.ui.firestore.FirestoreRecyclerAdapter;
import com.firebase.ui.firestore.FirestoreRecyclerOptions;

public class TalesAdapter extends FirestoreRecyclerAdapter<TalesDetails, TalesAdapter.TalesHolder> {

    public TalesAdapter(@NonNull FirestoreRecyclerOptions<TalesDetails> options) {

        super(options);
    }

    @Override
    protected void onBindViewHolder(@NonNull TalesHolder holder, int position, @NonNull TalesDetails talesDetails) {
        holder.textViewTitle.setText(talesDetails.getName());

    }

    @NonNull
    @Override
    public TalesHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.recyclerviewtales,
                parent, false);
        return new TalesHolder(v);

    }

    class TalesHolder extends RecyclerView.ViewHolder {
        TextView textViewTitle;


        public TalesHolder(View itemView) {
            super(itemView);
            textViewTitle = itemView.findViewById(R.id.tvName);

        }
    }
}

依賴關系

dependencies {
    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'androidx.recyclerview:recyclerview:1.1.0'
    implementation 'com.google.firebase:firebase-firestore:21.5.0'
    testImplementation 'junit:junit:4.12'
    implementation 'com.firebaseui:firebase-ui-firestore:6.3.0'
    implementation 'com.google.android.material:material:1.2.0'
    implementation 'com.google.firebase:firebase-firestore:21.5.0'
    implementation 'androidx.multidex:multidex:2.0.1'


    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

}

Answer 1

您的代碼中的問題在於您的TalesDetails class 中的name屬性設置為公共，並且名稱不正確。 如果要使用公共字段，則無需添加 getter 或 setter，否則，將其設為私有，如下所示：

public class TalesDetails {
    private String name; //Is set private and starting with a lowercase

    public TalesDetails() {}

    public TalesDetails(String name) {
        name = name; 
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        name = name;
    }
}

看， name屬性現在以小寫字母開頭。 除此之外，請注意在數據庫中將名稱設置為小寫。

您還可以查看以下三個答案， class中的小寫字母，數據庫中的大寫字母，class中的大寫字母，數據庫中的小寫字母和class中的大寫字母，數據庫中的大寫字母。