安卓公司。谷歌。火基。数据库DatabaseException:未能转换java类型的值。将字符串改为长字符串
我在尝试将数据检索到某个对象以供使用时,在遵循firebase数据库的文档时遇到了一个错误
这是我的对象模型
public class Cart {
private String pid, pname, price, discount, quantity;
public Cart() {
}
public Cart(String pid, String pname, String price, String discount, String quantity) {
this.pid = pid;
this.pname = pname;
this.price = price;
this.discount = discount;
this.quantity = quantity;
}
public String getPid() {
return pid;
}
public void setPid(String pid) {
this.pid = pid;
}
public String getPname() {
return pname;
}
public void setPname(String pname) {
this.pname = pname;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}
public String getDiscount() {
return discount;
}
public void setDiscount(String discount) {
this.discount = discount;
}
public String getQuantity() {
return quantity;
}
public void setQuantity(String quantity) {
this.quantity = quantity;
}
}
最后,守则及;我得到的错误行被注释了
FirebaseRecyclerOptions<Cart> options =
new FirebaseRecyclerOptions.Builder<Cart>()
.setQuery(cartListRef.child("User View")
.child(Prevalent.currentOnlineUser.getPhn_num())
.child("Products"), Cart.class)
.build();
FirebaseRecyclerAdapter<Cart, CartViewHolder> adapter =
new FirebaseRecyclerAdapter<Cart, CartViewHolder>(options) {
@Override
protected void onBindViewHolder(@NonNull CartViewHolder holder, int position, @NonNull Cart model)
{
holder.jProductName.setText(model.getPname());
holder.jProductPrice.setText("Price = Rs. " +model.getPrice());
holder.jProductQuantity.setText("Quantity = " +model.getQuantity());
}
@NonNull
@Override
public CartViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int i)
{
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.cart_items_layout, parent,false);
CartViewHolder holder = new CartViewHolder(view);
return holder;
}
};
recyclerView.setAdapter(adapter);
adapter.startListening();
这是我在Firebase中的数据库结构
来自logcat的完整Stacktrace在这里
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.dueaoinfo.shoppingapp, PID: 10511
com.google.firebase.database.DatabaseException: Failed to convert a value of type java.lang.String to long
at com.google.安卓.gms.internal.firebase_database.zzkt.zzb(Unknown Source:616)
at com.google.安卓.gms.internal.firebase_database.zzkt.zza(Unknown Source:301)
at com.google.安卓.gms.internal.firebase_database.zzkt.zzb(Unknown Source:0)
at com.google.安卓.gms.internal.firebase_database.zzku.zza(Unknown Source:71)
at com.google.安卓.gms.internal.firebase_database.zzkt.zzb(Unknown Source:146)
at com.google.安卓.gms.internal.firebase_database.zzkt.zza(Unknown Source:0)
at com.google.firebase.database.DataSnapshot.getValue(Unknown Source:10)
at com.firebase.ui.database.ClassSnapshotParser.parseSnapshot(ClassSnapshotParser.java:29)
at com.firebase.ui.database.ClassSnapshotParser.parseSnapshot(ClassSnapshotParser.java:15)
at com.firebase.ui.common.BaseCachingSnapshotParser.parseSnapshot(BaseCachingSnapshotParser.java:35)
at com.firebase.ui.common.BaseObservableSnapshotArray.get(BaseObservableSnapshotArray.java:52)
at com.firebase.ui.database.FirebaseRecyclerAdapter.getItem(FirebaseRecyclerAdapter.java:106)
at com.firebase.ui.database.FirebaseRecyclerAdapter.onBindViewHolder(FirebaseRecyclerAdapter.java:122)
at 安卓.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:6781)
at 安卓.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:6823)
at 安卓.support.v7.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:5752)
at 安卓.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6019)
at 安卓.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5858)
at 安卓.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5854)
at 安卓.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2230)
at 安卓.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1557)
at 安卓.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1517)
at 安卓.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:612)
at 安卓.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3924)
at 安卓.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3641)
at 安卓.support.v7.widget.RecyclerView.consumePendingUpdateOperations(RecyclerView.java:1888)
at 安卓.support.v7.widget.RecyclerView$1.run(RecyclerView.java:407)
at 安卓.view.Choreographer$CallbackRecord.run(Choreographer.java:1092)
at 安卓.view.Choreographer.doCallbacks(Choreographer.java:888)
at 安卓.view.Choreographer.doFrame(Choreographer.java:816)
at 安卓.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1078)
at 安卓.os.Handler.handleCallback(Handler.java:873)
at 安卓.os.Handler.dispatchMessage(Handler.java:99)
at 安卓.os.Looper.loop(Looper.java:201)
at 安卓.app.ActivityThread.main(ActivityThread.java:6823)
at java.lang.reflect.Method.invoke(Native Method)
at com.安卓.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:873)
# 1 楼答案
quantity
和discount
是firebase数据库中的Long
值,在Cart
类中声明为String
。这是抛出错误。声明Cart
类,如下所示希望这能解决你的问题