LiveData的ViewModel SavedStateHandler.get无法根据文档设置默认值吗？

问题描述

在引用

 String defaultValue = ...; // nullable
 LiveData<String> liveData;
 if (defaultValue != null) {
     liveData = savedStateHandle.get(KEY, defaultValue);
 } else {
     liveData = savedStateHandle.get(KEY);
 }

但是，我注意到在尝试编译代码时，下面的语句是

However, I notice that when tried to compile the code, the statement below is not compilable.

savedStateHandle.get(KEY, defaultValue);

错误指出

get(String) in SavedStateHandle cannot be applied to (String, java.lang.String).

我跟踪代码，看起来像 savedStatehandle 没有使用默认值的 get 。我错过了什么吗？

I trace into the code, and seems like savedStatehandle doesn't have a get that takes in a default value. Did I miss anything?

推荐答案

显然Google文档有错字。

Apparently the Google Document has typo. It supposed to be

 String defaultValue = ...; // nullable
 LiveData<String> liveData;
 if (defaultValue != null) {
     liveData = savedStateHandle.getLiveData(KEY, defaultValue);
 } else {
     liveData = savedStateHandle.getLiveData(KEY);
 }

即 getLiveData 而不只是 get 。

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