Android 忽略POJO中没有的内容
我正在尝试使用Firebase对我的应用程序执行一些请求。我可以保存数据,但当我试图检索数据时,会出现此错误Android 忽略POJO中没有的内容,android,firebase,firebase-realtime-database,Android,Firebase,Firebase Realtime Database,我正在尝试使用Firebase对我的应用程序执行一些请求。我可以保存数据,但当我试图检索数据时,会出现此错误 06-20 12:07:15.151 28158-28158/sgk.com.br.sgk E/AndroidRuntime: FATAL EXCEPTION: main Process: sgk.com.br.sgk, PID: 28158 com.firebase.client.FirebaseException: Failed to bounce to type at
06-20 12:07:15.151 28158-28158/sgk.com.br.sgk E/AndroidRuntime: FATAL EXCEPTION: main
Process: sgk.com.br.sgk, PID: 28158
com.firebase.client.FirebaseException: Failed to bounce to type
at com.firebase.client.DataSnapshot.getValue(DataSnapshot.java:183)
at sgk.com.br.sgk.Activity.GreatTrainsActivity$1.onDataChange(GreatTrainsActivity.java:65)
at com.firebase.client.core.ValueEventRegistration.fireEvent(ValueEventRegistration.java:45)
at com.firebase.client.core.view.DataEvent.fire(DataEvent.java:45)
at com.firebase.client.core.view.EventRaiser$1.run(EventRaiser.java:38)
at android.os.Handler.handleCallback(Handler.java:746)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
Caused by: com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "vdsrXOFXRZbAfmoEQ3WEVB1GDDa2" (class sgk.com.br.sgk.Others.Train), not marked as ignorable (2 known properties: , "description", "local"])
at [Source: java.io.StringReader@ab8ad7; line: 1, column: 34] (through reference chain: sgk.com.br.sgk.Others.Train["vdsrXOFXRZbAfmoEQ3WEVB1GDDa2"])
at com.fasterxml.jackson.databind.DeserializationContext.reportUnknownProperty(DeserializationContext.java:555)
at com.fasterxml.jackson.databind.deser.std.StdDeserializer.handleUnknownProperty(StdDeserializer.java:708)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownProperty(BeanDeserializerBase.java:1160)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:315)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:121)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2888)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2034)
at com.firebase.client.DataSnapshot.getValue(DataSnapshot.java:181)
at sgk.com.br.sgk.Activity.GreatTrainsActivity$1.onDataChange(GreatTrainsActivity.java:65)
at com.firebase.client.core.ValueEventRegistration.fireEvent(ValueEventRegistration.java:45)
at com.firebase.client.core.view.DataEvent.fire(DataEvent.java:45)
at com.firebase.client.core.view.EventRaiser$1.run(EventRaiser.java:38)
at android.os.Handler.handleCallback(Handler.java:746)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at java.lang.reflect.Method.invoke(Native Method)
我已经知道问题出在哪里了
我的数据库就是这样
{
"Train" : {
"description" : "dbdjem",
"local" : "shsusn"
},
"users" : {
"f01dfa18-54ac-41ea-97ff-97d0e40b872b" : {
"email" : "gui@email.com"
},
"vdsrXOFXRZbAfmoEQ3WEVB1GDDa2" : {
"email" : "leo@email.com"
}
}
}
如果我删除了POJO中除此之外的所有内容,那么它工作得非常好
因此,我的问题是:除了POJO上的内容之外,还有什么方法可以忽略数据库中的其他内容吗
编辑
这是我的POJO
public class Train {
private String local;
private String description;
public String data;
public Train() {
}
public String getLocal() {
return local;
}
public void setLocal(String local) {
this.local = local;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
@Exclude
public String getData(){return data;}
}
这是电话
Firebase ref = new Firebase(Constants.FIREBASE_URL);
ref.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
for (DataSnapshot postSnapshot: snapshot.getChildren()) {
//Getting the data from snapshot
Train train = postSnapshot.getValue(Train.class);
//Adding it to a string
String string = "Local: " + train.getLocal() + "\nDescrição: " + train.getDescription() + "\n\n";
//Displaying it on textview
textViewPersons.setText(string);
}
}
@Override
public void onCancelled(FirebaseError firebaseError) {
System.out.println("The read failed: " + firebaseError.getMessage());
}
});
您正在将一个
ChildEventListener
附加到数据库的根目录。该根下的子项是:
Train
users
这两种方法都不适合您创建的JavaTrain
类
解决方案是通过以下方式将侦听器连接到Trains
节点:
Firebase ref = new Firebase(Constants.FIREBASE_URL);
ref.child("Trains").addValueEventListener(new ValueEventListener() {
...
您能否显示正在读取数据的代码(即调用
DataSnapshot.getValue()
)和您的POJO?Frank,我按照您的要求进行了编辑。Thanks@FrankvanPuffelen对不起,看来我们几乎同时打了一次。(dale grêmio@LeonardoAssunção):PYou似乎正在使用Firebase 3.x SDK(@Exclude
)中的注释,而您的代码正在使用Firebase 2.x SDK(新Firebase(Constants.Firebase_URL)
)。这肯定会引起问题,所以我建议选择一个并坚持下去。下一个问题:FIREBASE\u URL
指向什么?谢谢Frank!工作得很好