如何从android中的firebase获取对象？

我有这样的用户类

public class User{
int id;
String description;
String shortDescription;
String photo;

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getDescription() {
    return description;
}

public void setDescription(String description) {
    this.description = description;
}

public String getShortDescription() {
    return shortDescription;
}

public void setShortDescription(String shortDescription) {
    this.shortDescription = shortDescription;
}

public String getPhoto() {
    return photo;
}

public void setPhoto(String photo) {
    this.photo = photo;
}
}

我使用FirebaseRecyclerAdapter获取存储在我的Firebase中的用户，如下所示

 FirebaseRecyclerAdapter<User, UserHolder> adapter =
            new FirebaseRecyclerAdapter<User, UserHolder>(
                    User.class,
                    android.R.layout.two_line_list_item,
                    UserHolder.class,
                    mRef) {
                @Override
                protected void populateViewHolder(UserHolder userHolder, User u, int i) {
                    userHolder.mText.setText(u.getDescription());
                }
            };

但问题在于用户对象的Firebase关键字是什么时候

 > -KDY9Pna7XqgFkyCHKFJ

这然后它的工作正常，但如果火力点钥匙是

 > c5755a68-69a7-4464-956e-c2f94d9b387d

这个唯一的ID然后它给出了一个错误

> com.firebase.client.FirebaseException: Failed to bounce to type

致命异常：主进程：in.rofr，PID：12399 com.firebase.client.FirebaseException：无法退出以在com.firebase.ui上的com.firebase.client.DataSnapshot.getValue（DataSnapshot.java:183）上键入。 FirebaseRecyclerAdapter.parseSnapshot（FirebaseRecyclerAdapter.java:161）at com.firebase.ui.FirebaseRecyclerAdapter.getItem（FirebaseRecyclerAdapter.java:150）at com.firebase.ui.FirebaseRecyclerAdapter.onBindViewHolder（FirebaseRecyclerAdapter.java:190）at android.support.v7 .widget.RecyclerView $ Adapter.onBindViewHolder（RecyclerView.java:5465）at android.support.v7.widget.RecyclerView $ Adapter.bindViewHolder（RecyclerView.java:5498）at android.support.v7.widget.RecyclerView $ Recycler.getViewForPosition （RecyclerView.java:4735）在android.support.v7.widget.RecyclerView $ Recycler.getViewForPosition（RecyclerView.java:4611）在android.support.v7.widget.LinearLayoutManager $ LayoutState.next（LinearLayoutManager.java:1988）在android.support.v7.widget.LinearLayoutManager.layoutChunk（LinearLayoutManager.j AVA：1384）在android.support.v7.widget.LinearLayoutManager.fill（LinearLayoutManager.java:1347）在android.support.v7.widget.LinearLayoutManager.onLayoutChildren（LinearLayoutManager.java:574）在android.support.v7.widget .RecyclerView.dispatchLayoutStep2（RecyclerView.java:3026）at android.support.v7.widget.RecyclerView.dispatchLayout（RecyclerView.java:2903）at android.support.v7.widget.RecyclerView.onLayout（RecyclerView.java:3277）at在android.widget.FrameLayout的android.widget.FrameLayout.layoutChildren（FrameLayout.java:579）处的android.view.ViewGroup.layout（ViewGroup.java:5040）处的android.view.View.layout（View.java:15689） .onLayout（FrameLayout.java:514）at android.view.View.layout（View.java:15689）at android.view.ViewGroup.layout（ViewGroup.java:5040）at android.widget.LinearLayout.setChildFrame（LinearLayout。在Android.widget.Lineout.layoutVertical（LinearLayout.java:1557）在android.widget.LinearLayout.onLayout（LinearLayout.java:1466）在android.view.View.layout（View.java： 15689）在android.view.View.layout（View.java:15689）处的android.support.v4.widget.DrawerLayout.onLayout（DrawerLayout.java:1183）处的android.view.ViewGroup.layout（ViewGroup.java:5040） ）在android.view.ViewGroup.layout（ViewGroup.java:5040）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:579）在android.widget.FrameLayout.onLayout（FrameLayout.java:514）在android.view .View.layout（View.java:15689）在android.view.ViewGroup.layout（ViewGroup.java:5040）在android.widget.LinearLayout.setChildFrame（LinearLayout.java:1703）在android.widget.LinearLayout.layoutVertical（ LinearLayout.java:1557）在android.view.View.layout（View.java:15689）android.view.ViewGroup.layout（ViewGroup.java:5040）android.widget.LinearLayout.onLayout（LinearLayout.java:1466） ）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:579）在android.widget.FrameLayout.onLayout（FrameLayout.java:514）在android.view.View.layout（View.java:15689）在android.view .Group.layout（ViewGroup.java:5040）atroi d.widget.LinearLayout.setChildFrame（LinearLayout.java:1703）在android.widget.LinearLayout.layoutVertical（LinearLayout.java:1557）在android.widget.LinearLayout.onLayout（LinearLayout.java:1466）在android.view.View .layout（View.java:15689）在android.view.ViewGroup.layout（ViewGroup.java:5040）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:579）在android.widget.FrameLayout.onLayout（的FrameLayout。在android.view.View.layout（View.java:15689）在android.view.ViewGroup.layout（ViewGroup.java:5040）在android.view.ViewRootImpl.performLayout（ViewRootImpl.java:2116）在android.view.ViewRootImpl.performTraversals（ViewRootImpl.java:1873）at android.view.ViewRootImpl.doTraversal（ViewRootImpl.java:1084）at android.view.ViewRootImpl $ TraversalRunnable.run（ViewRootImpl.java:5990）at android.view编辑$ CallbackRecord.run（Choreographer.java:767）在android.view.Choreographer.doCallbacks（Choreographer.java:580）at android.view.Choreographer.doFrame（Choreographer.java:550）

什么是确切的问题 ，我没有得到任何人都可以帮助我？

提前致谢 ！！！

---

尝试把@JsonIgnoreProperties（ignoreUnknown = true）放在类的顶部

@JsonIgnoreProperties(ignoreUnknown = true)
public class UserModel {

}

这可能会起作用，因为Firebase使用Jackson库来序列化/反序列化JSON，并且使用@JsonIgnoreProperties（ignoreUnknown = true）将忽略新的属性（未在类中声明的属性），如https://stackoverflow.com/所述一个/二百三十三万一千七百零五分之五百四十五万五千五百六十三

链接地址: http://www.djcxy.com/p/93149.html

上一篇: how to get the object from firebase in android?

下一篇: java.lang.ClassCastException: com.parse.ParseObject cannot be cast to