当将Firebase 2.4 ref.updateChildren()与HashMap一起使用时，除了HashMap<String, Object>(例如HashMap<String, User>)之外，都会获得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)
编辑:
有没有办法将像
HashMap<String, User>这样的自定义HashMap传递给ref.updateChildren()？ 最佳答案
关于您的最后一个问题:
适用于Android/Java的Firebase SDK不支持将POJO(例如User类)直接传递到updateChildren()中。
但是您可以做的是使用以下命令将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给
updateChildren()的值中:updates.put("users/"+uid, userMap);
updates.put("lists/"+uid+"/mine, "value");
ref.updateChildren(updates);