英文:
For a Wear Os watchface/app, how can I request focus for the current preference screen?
问题
我有一个 Wear OS 应用（表盘），用户可以打开一个首选项活动（基于 PreferenceFragment 的 PreferenceScreen），用于设置用户设置。我正在尝试启用手表旋钮或旋钮边框的旋转输入，但尚未成功。
到目前为止，我发现问题与缺少焦点有关。那么，在首选项屏幕创建时请求焦点的正确方式是什么？
英文:
I have a Wear OS app (watch face) where the user can open a preference activity (PreferenceScreen based on PreferenceFragment) for all the user settings. I am trying to enable rotary input for the watch knob or rotary bezel, but haven't been able to.
So far I found out that the issue is related with missing focus. So, what is the proper way to request focus when the preference screen is created?
答案1
得分: 0
最终我找到了解决方案：在我的PreferenceFragment中，我必须重写onActivityCreated并在当前视图上请求焦点。（似乎在使用PreferenceFragmentCompat时也有效）。
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if (getView() != null) getView().requestFocus(); // 启用旋钮输入
}
唯一的问题是，当打开首选屏幕中的嵌套子部分时，旋钮输入会停止。但在返回时会恢复。这似乎是正常的，如https://developer.android.com/training/wearables/user-input/rotary-input中所述：“如果您的活动包含多个可滚动视图，请选择一个视图使用<requestFocus />标记来进行焦点设置。不支持旋转侧按钮的嵌套滚动”。
英文:
Finally I found a solution: in my preferenceFragment I had to override onActivityCreated and request the focus on the current view. (Seems to also work when using preferenceFragmentCompat).
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if (getView() != null) getView().requestFocus(); // ENABLES ROTARY INPUT
}
The only thing is that rotary input stops when opening a nested subsection in the preference screen. But it reestablishes when coming back. This seems to be normal as described in https://developer.android.com/training/wearables/user-input/rotary-input: "If your activity contains multiple scrollable views, choose one to focus using the <requestFocus /> tag. Nested scrolling is not supported with the rotating side button."
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