使用新的ref.updateChildren()的Android Firebase 2.4 IllegalStateException

Question

将Firebase 2.4 ref.updateChildren()与HashMap一起使用时,除了HashMap<String, Object>(例如HashMap<String, User>)获取IllegalStateException之外.

> 09-29 18:03:21.680: E/AndroidRuntime(6863): FATAL EXCEPTION: main
> 09-29 18:03:21.680: E/AndroidRuntime(6863): Process:
> com.xxx.xxx.xxx, PID: 6863 09-29
> 18:03:21.680: E/AndroidRuntime(6863): java.lang.IllegalStateException:
> Could not execute method of the activity 09-29 18:03:21.680:
> E/AndroidRuntime(6863):   at
> android.view.View$1.onClick(View.java:4035) 09-29 18:03:21.680:
> E/AndroidRuntime(6863):   at
> android.view.View.performClick(View.java:4881) 09-29 18:03:21.680:
> E/AndroidRuntime(6863):   at
> android.view.View$PerformClick.run(View.java:19592) 09-29
> 18:03:21.680: E/AndroidRuntime(6863):     at
> android.os.Handler.handleCallback(Handler.java:733) 09-29
> 18:03:21.680: E/AndroidRuntime(6863):     at
> android.os.Handler.dispatchMessage(Handler.java:95) 09-29
> 18:03:21.680: E/AndroidRuntime(6863):     at
> android.os.Looper.loop(Looper.java:146) 09-29 18:03:21.680:
> E/AndroidRuntime(6863):   at
> android.app.ActivityThread.main(ActivityThread.java:5756) 09-29
> 18:03:21.680: E/AndroidRuntime(6863):     at
> java.lang.reflect.Method.invokeNative(Native Method) 09-29
> 18:03:21.680: E/AndroidRuntime(6863):     at
> java.lang.reflect.Method.invoke(Method.java:515) 09-29 18:03:21.680:
> E/AndroidRuntime(6863):   at
> com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
> 09-29 18:03:21.680: E/AndroidRuntime(6863):   at
> com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107) 09-29
> 18:03:21.680: E/AndroidRuntime(6863):     at
> dalvik.system.NativeStart.main(Native Method) 09-29 18:03:21.680:
> E/AndroidRuntime(6863): Caused by:
> java.lang.reflect.InvocationTargetException 09-29 18:03:21.680:
> E/AndroidRuntime(6863):   at
> java.lang.reflect.Method.invokeNative(Native Method) 09-29
> 18:03:21.680: E/AndroidRuntime(6863):     at
> java.lang.reflect.Method.invoke(Method.java:515) 09-29 18:03:21.680:
> E/AndroidRuntime(6863):   at
> android.view.View$1.onClick(View.java:4030) 09-29 18:03:21.680:
> E/AndroidRuntime(6863):   ... 11 more 09-29 18:03:21.680:
> E/AndroidRuntime(6863): Caused by:
> com.firebase.client.FirebaseException: Failed to parse node with class
> class com.xxx.xxx.xxx.User 09-29
> 18:03:21.680: E/AndroidRuntime(6863):     at
> com.firebase.client.snapshot.NodeUtilities.NodeFromJSON(NodeUtilities.java:84)
> 09-29 18:03:21.680: E/AndroidRuntime(6863):   at
> com.firebase.client.snapshot.NodeUtilities.NodeFromJSON(NodeUtilities.java:12)
> 09-29 18:03:21.680: E/AndroidRuntime(6863):   at
> com.firebase.client.utilities.Validation.parseAndValidateUpdate(Validation.java:127)
> 09-29 18:03:21.680: E/AndroidRuntime(6863):   at
> com.firebase.client.Firebase.updateChildren(Firebase.java:438)

编辑:

有没有办法通过自定义HashMap的喜欢HashMap<String, User>来ref.updateChildren()？

Answer 1

关于你的上一个问题:

有没有办法将自定义HashMap像HashMap传递给ref.updateChildren()？

适用于Android/Java的Firebase SDK不支持直接将POJO(如您的User类)传递到updateChildren().

但你可以做的是将POJO转换为Map:

Map<String, Object> userMap = new ObjectMapper().convertValue(user, Map.class);

然后,您可以将值映射放入要传递到的值中updateChildren():

updates.put("users/"+uid, userMap);
updates.put("lists/"+uid+"/mine, "value");

ref.updateChildren(updates);

Answer 2

与官方Firebase博客的代码段一样要避免此问题,必须重新编写自定义结构,如下所示:

Map<String, String> newPost = new HashMap<String, String>();
newPost.put("title", "New Post");
newPost.put("content", "Here is my new post!");

然后把它代替自定义数据模型:

Map<String, Object> updatedUserData = new HashMap<String, Object>();
updatedUserData.put("users/posts/" + newPostKey, true);
updatedUserData.put("posts/" + newPostKey, newPost);

使用自定义数据模型而不是newPost导致IllegalStateException.