我正在使用这个代码来更新Firebase上的数据,但它是新的.我尝试了很多代码,并且使用相同键的新的代码,除了最后一个字符.
我用这个作为Firebase网站推荐,但它不工作.我创建了一个新的下一次更新：
Map<String,Object> childUpdate = new HashMap<>();
childUpdate.put("/masjeds/" + masjed.getId(),masjed.toMap());
reference.updateChildren(childUpdate);
而这段代码也是一样的
final FirebaseDatabase database = FirebaseDatabase.getInstance();
masjeds = database.getReference("masjeds");
reference.child(masjed.getId()).setValue(masjed,new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError databaseError,DatabaseReference databaseReference) {
// Toast.makeText(MyMasjedsActivity.this,databaseError.getMessage(),Toast.LENGTH_SHORT).show();
}
});
Masjed类是纯java对象
public class Masjed {
private String userID;
private String id;
private String name;
private String address;
private String phone;
private boolean matloopEmam;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getUserID() {
return userID;
}
public void setUserID(String userID) {
this.userID = userID;
}
public boolean isMatloopEmam() {
return matloopEmam;
}
public void setMatloopEmam(boolean matloopEmam) {
this.matloopEmam = matloopEmam;
}
public Masjed(String name,String address,String phone) {
this.name = name;
this.address = address;
this.phone = phone;
}
public Masjed() {
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public Map<String,Object> toMap() {
Map<String,Object> map = new HashMap<>();
map.put("name",name);
map.put("address",address);
map.put("phone",phone);
map.put("id",id);
map.put("userID",userID);
return map;
}
}
id是我假设push.getkey并将其作为ID的问题
那么使用push.setValue(masjed)将使用相同的键
事实证明,当我使用它的dosnt存在时,它并不总是Case的改变,所以它创建了一个帮助我的答案是Chester Answer
解决方法
我希望这有助于,在我的宠物项目中使用它(这不是清洁的解决方案,但它的工作原理)：
masjeds = database.getReference("masjeds");
ValueEventListener listener = new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()) {
masjedKey = dataSnapshot1.getKey(); // This is a member variable
masjed = dataSnapshot1.getValue(Masjed.class); // This is a member variable
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
};
masjeds.orderByChild("id").equalTo(masjed.getId()).addValueEventListener(listener);
//Use your Map to update each value this is just an example
masjeds.child(masjedKey).child("name").setValue("John"); //you can add event listener if you want to see if it's completed,but it works without the events
