我将一个json文件从parse导入到firebase，json文件有一个项目数组：
{ "results": [
{
"Bids": ".................",
"Instrument": ".................",
"InstrumentCompany": ".................",
"InstrumentModel": ".................",
"InstrumentUrl": "http://.................",
"LastUpdatedPrice": "3,790.00",
"TitleTag": ".................",
"Type": ".................",
"UrlForImg": "http://.................861680.jpg",
"createdAt": "2015-12-01T09:42:23.994Z",
"objectId": "0IT7.................",
"updatedAt": "2016-02-04T11:01:37.159Z"
},
{
"Bids": ".................",
"Instrument": ".................",
"InstrumentCompany": ".................",
"InstrumentModel": ".................",
"InstrumentUrl": "http://.................",
"LastUpdatedPrice": ".................",
"TitleTag": ".................",
"Type": ".................",
"UrlForImg": "http://.................jpeg",
"createdAt": "2015-12-01T09:43:29.138Z",
"objectId": "0QNyY.................",
"updatedAt": "2016-02-04T11:04:03.561Z"
}
] }
火基地的网址是： https://console.firebase.google.com/project/abcdefghijk/database/data/ClassicGuitars
我创建了一个用于检索对象的java类：
public class ClassicGuitar {
private String Bids;
private String Instrument;
private String InstrumentCompany;
private String InstrumentModel;
private String InstrumentUrl;
private String LastUpdatedPrice;
private String TitleTag;
private String Type;
private String UrlForImg;
String createdAt;
String objectId;
String updatedAt;
public ClassicGuitar (){};
public String getBids() {
return Bids;
}
public void setBids(String bids) {
Bids = bids;
}
public String getInstrument() {
return Instrument;
}
public void setInstrument(String instrument) {
Instrument = instrument;
}
public String getInstrumentCompany() {
return InstrumentCompany;
}
public void setInstrumentCompany(String instrumentCompany) {
InstrumentCompany = instrumentCompany;
}
public String getInstrumentModel() {
return InstrumentModel;
}
public void setInstrumentModel(String instrumentModel) {
InstrumentModel = instrumentModel;
}
public String getInstrumentUrl() {
return InstrumentUrl;
}
public void setInstrumentUrl(String instrumentUrl) {
InstrumentUrl = instrumentUrl;
}
public String getLastUpdatedPrice() {
return LastUpdatedPrice;
}
public void setLastUpdatedPrice(String lastUpdatedPrice) {
LastUpdatedPrice = lastUpdatedPrice;
}
public String getTitleTag() {
return TitleTag;
}
public void setTitleTag(String titleTag) {
TitleTag = titleTag;
}
public String getType() {
return Type;
}
public void setType(String type) {
Type = type;
}
public String getUrlForImg() {
return UrlForImg;
}
public void setUrlForImg(String urlForImg) {
UrlForImg = urlForImg;
}
public String getCreatedAt() {
return createdAt;
}
public void setCreatedAt(String createdAt) {
this.createdAt = createdAt;
}
public String getObjectId() {
return objectId;
}
public void setObjectId(String objectId) {
this.objectId = objectId;
}
public String getUpdatedAt() {
return updatedAt;
}
public void setUpdatedAt(String updatedAt) {
this.updatedAt = updatedAt;
}
}
按照firebase指南的说明我这样做了：
Firebase.setAndroidContext(this);
Firebase ref = new Firebase("https://abcdefghijk.firebaseio.com/");
Firebase classicGuitarsRef = ref.child("ClassicGuitars").child("results");
classicGuitarsRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapShot) {
Log.i("firebase","There are " + snapShot.getChildrenCount() + " classic guitars");
for (DataSnapshot classicSnapShot : snapShot.getChildren()) {
ClassicGuitar classic = classicSnapShot.getValue(ClassicGuitar.class);
Log.i("firebase","InstrumentCompany: " + classic.getInstrumentCompany());
Log.i("firebase","InstrumentModel: " + classic.getInstrumentModel());
}
}
让chiildren计数有效，但其余的dosn't.i得到无法反弹以输入异常。这是logcat：
07-05 08:25:50.310: E/AndroidRuntime(32195): com.firebase.client.FirebaseException: Failed to bounce to type
07-05 08:25:50.310: E/AndroidRuntime(32195): at com.firebase.client.DataSnapshot.getValue(DataSnapshot.java:185)
07-05 08:25:50.310: E/AndroidRuntime(32195): at com.bobby.abcdefghijk.FireBaseTest$Bg$1.onDataChange(FireBaseTest.java:44)
07-05 08:25:50.310: E/AndroidRuntime(32195): at com.firebase.client.core.ValueEventRegistration.fireEvent(ValueEventRegistration.java:56)
07-05 08:25:50.310: E/AndroidRuntime(32195): at com.firebase.client.core.view.DataEvent.fire(DataEvent.java:45)
07-05 08:25:50.310: E/AndroidRuntime(32195): at com.firebase.client.core.view.EventRaiser$1.run(EventRaiser.java:38)
07-05 08:25:50.310: E/AndroidRuntime(32195): at android.os.Handler.handleCallback(Handler.java:739)
07-05 08:25:50.310: E/AndroidRuntime(32195): at android.os.Handler.dispatchMessage(Handler.java:95)
07-05 08:25:50.310: E/AndroidRuntime(32195): at android.os.Looper.loop(Looper.java:158)
07-05 08:25:50.310: E/AndroidRuntime(32195): at android.app.ActivityThread.main(ActivityThread.java:7224)
07-05 08:25:50.310: E/AndroidRuntime(32195): at java.lang.reflect.Method.invoke(Native Method)
07-05 08:25:50.310: E/AndroidRuntime(32195): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
07-05 08:25:50.310: E/AndroidRuntime(32195): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
07-05 08:25:50.310: E/AndroidRuntime(32195): Caused by: com.shaded.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "InstrumentCompany" (class com.bobby.abcdefghijk.ClassicGuitar), not marked as ignorable (12 known properties: , "instrumentModel", "titleTag", "lastUpdatedPrice", "instrument", "instrumentUrl", "urlForImg", "updatedAt", "bids", "instrumentCompany", "objectId", "type", "createdAt"])
07-05 08:25:50.310: E/AndroidRuntime(32195): at [Source: java.io.StringReader@4cefeee; line: 1, column: 23] (through reference chain: com.bobby.abcdefghijk.ClassicGuitar["InstrumentCompany"])
07-05 08:25:50.310: E/AndroidRuntime(32195): at com.shaded.fasterxml.jackson.databind.DeserializationContext.reportUnknownProperty(DeserializationContext.java:555)
07-05 08:25:50.310: E/AndroidRuntime(32195): at com.shaded.fasterxml.jackson.databind.deser.std.StdDeserializer.handleUnknownProperty(StdDeserializer.java:708)
07-05 08:25:50.310: E/AndroidRuntime(32195): at com.shaded.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownProperty(BeanDeserializerBase.java:1160)
07-05 08:25:50.310: E/AndroidRuntime(32195): at com.shaded.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:315)
07-05 08:25:50.310: E/AndroidRuntime(32195): at com.shaded.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:121)
07-05 08:25:50.310: E/AndroidRuntime(32195): at com.shaded.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2888)
07-05 08:25:50.310: E/AndroidRuntime(32195): at com.shaded.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2034)
07-05 08:25:50.310: E/AndroidRuntime(32195): at com.firebase.client.DataSnapshot.getValue(DataSnapshot.java:183)
07-05 08:25:50.310: E/AndroidRuntime(32195): ... 11 more