Android Firebase:区分大小写的名称无效

Question

我正在尝试将一个跟踪类型对象添加到Firebase DB中，该数据库具有检查点类型对象的ArrayList。

ssDB.child("tracks").child(trackKey).setValue(newTrack)

但是我收到一个错误：

03-25 09:35:38.293 9189-9189/com.illbirdstudios.illbird.streetsend E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.illbirdstudios.illbird.streetsend, PID: 9189
com.google.firebase.database.DatabaseException: Found setter with invalid case-sensitive name: setCheckpoints
at com.google.android.gms.internal.zzelx.<init>(Unknown Source:403)
at com.google.android.gms.internal.zzelw.zzf(Unknown Source:12)
at com.google.android.gms.internal.zzelw.zzb(Unknown Source:756)
at com.google.android.gms.internal.zzelw.zza(Unknown Source:0)
at com.google.firebase.database.DataSnapshot.getValue(Unknown Source:10)
at com.illbirdstudios.illbird.streetsend.CreateTrackActivity2$1$1.onDataChange(CreateTrackActivity2.java:174)
at com.google.firebase.database.zzp.onDataChange(Unknown Source:7)
at com.google.android.gms.internal.zzegf.zza(Unknown Source:13)
at com.google.android.gms.internal.zzeia.zzbyc(Unknown Source:2)
at com.google.android.gms.internal.zzeig.run(Unknown Source:65)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)

这是我的田径课

public class Track {
private String trackOwner;
private String trackName;
public final static String POINTTOPOINT = "POINTTOPOINT";
public final static String CIRCUIT = "CIRCUIT";
private String trackType;
private ArrayList<Checkpoint> checkpoints;
public Track(String trackOwner, String trackName, String trackType){
this.trackOwner = trackOwner;
this.trackName = trackName;
this.trackType = trackType;
checkpoints = new ArrayList<Checkpoint>();
}
public Track(){
}
public String getTrackOwner(){
return this.trackOwner;
}
public String getTrackName(){
return this.trackName;
}
public String getTrackType(){
return this.trackType;
}
public void setCheckpoints(ArrayList<Checkpoint> checkpoints){
this.checkpoints = checkpoints;
}
public void addCheckPoint(Checkpoint checkpoint){
checkpoints.add(checkpoint);
}
public ArrayList<Checkpoint> getCheckPoints(){
return this.checkpoints;
}
}

当我尝试通过子调用将每个 Track 项目单独添加到数据库时，它有效：

Log.d("Saving Track", "Track Name");
ssDB.child("tracks").child(trackKey).child("trackName").setValue(newTrack.getTrackName());
Log.d("Saving Track", "Track Owner");
ssDB.child("tracks").child(trackKey).child("trackOwner").setValue(newTrack.getTrackOwner());
Log.d("Saving Track", "Track Type");
ssDB.child("tracks").child(trackKey).child("trackType").setValue(newTrack.getTrackType());
Log.d("Saving Track", "Track Checkpoints");
ssDB.child("tracks").child(trackKey).child("checkpoints").setValue(newTrack.getCheckPoints());

但当我将值设置为对象本身时，情况并非如此。

ssDB.child("tracks").child(trackKey).setValue(newTrack)

Answer 1

由于以下字段，您会收到此错误：

private ArrayList<Checkpoint> checkpoints;

正确的吸气剂和二传手应该是：

public ArrayList<Checkpoint> getCheckpoints() {
return checkpoints;
}
public void setCheckpoints(ArrayList<Checkpoint> checkpoints) {
this.checkpoints = checkpoints;
}

你的 getter 应该是getCheckpoints()的，而不是像代码中那样getCheckPoints()。请参阅小写p与大写字母P。

Answer 2

你的 setter 和 getter 应该遵循 Java Bean 的原则。目前，您的吸气手和二传手不匹配。

此外，请考虑不要使用 ArrayList 来存储数据列表，而是使用 Maps。在 Firebase 文档中，您可以在此处找到一些存储列表的最佳做法。