在Android配置更改中保存模型的最佳方法是什么？

Question

In my application, I have a fragment which renders a model object fetched from the server. The model class implements Parcelable so when the device is rotated, I save the model in onSaveInstanceState() and then I load the model in onCreate() . If the savedInstanceState bundle does not contain the model in onCreate() , I make the network request again.

My question is: Is it better to preserve the state of the model by having it implement Parcelable and saving it in onSaveInstanceState() OR is it better to simply set the Fragment 's setRetainInstanceState(true) .

Answer 1

In my opinion setInstanceState should be used only in special cases, while onSaveInstanceState() should be used as standard approach to keep fragment's state. This is common way for keeping state of all Android's components. Keeping fragment in memory can lead to situations like strange views behavior and memory leaks.

Answer 2

API指南建议使用保留的无头数据片段。