Question

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

> 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)

修改：

有没有办法将HashMap<String, User>之类的自定义HashMap传递给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一样传递给ref.updateChildren（）？

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

但您可以做的是将POJO转换为Map并使用：

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

然后，您可以将值地图放入您传入updateChildren()的值中：

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

ref.updateChildren(updates);

Answer 2

与Official Firebase Blog中的代码段一样，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!");

然后将其替换为自定义数据模型：

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会导致IllegalStateException。

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

2 个答案: