Android TV 在 RecyclerViews 之间移动焦点 [英] Android TV move focus between RecyclerViews
问题描述
我正在构建一个具有以下布局的 Android TV 应用:
I am building an Android TV app with the following layout:
左右两个列表都是带有垂直LinearLayoutManagers的RecyclerViews，Header视图是静态的.使用 D-PAD 导航在一个列表中工作正常，但从一个列表切换到另一个列表时会出现问题.焦点从列表 1 的第 5 项移动到列表 2 的第 5 项.当列表 2 少于 5 项时，它就会失去焦点.
Both lists on the left and on the right are RecyclerViews with vertical LinearLayoutManagers, Header view is static. Navigation with D-PAD works fine within one list, but when switching from one list to another there are issues. Focus moves from, say list1's item 5 to list2' item 5. When list 2 is short has less than 5 items, it just loses focus.
我希望保存最后一个聚焦的项目索引，并且当用户导航 list1-list2-list1 时，具有该索引的项目再次获得焦点并防止视图失去焦点.有什么好的解决办法吗?
I want the last focused item index saved and when the user navigates list1-list2-list1 the item with that index to gain focus again and also prevent the views from losing focus. Is there any good solution to this?
要求的行为:用户导航到列表顶部并按向上" - 焦点停留在原来的位置，没有任何反应.用户导航到列表底部并按向下" - 焦点停留在原来的位置，没有任何反应.用户从列表 1 导航到列表 2 - 之前在列表 2 中获得焦点的项目获得焦点，如果之前没有获得焦点，则项目 0 获得焦点.
Required behaviour: user navigates to the top of the list and presses "UP" - focus stays where it was, nothing happens. user navigates to the bottom of the list and presses "DOWN" - focus stays where it was, nothing happens. user navigates from list1 to list2 - the item, that previously had focus in list2, gains focus or item0 gains focus if none was focused previously.
主要布局:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<ImageView
android:id="@+id/iv_background"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:focusable="false"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="27dp"
android:layout_marginLeft="48dp"
android:layout_marginRight="48dp"
android:layout_marginTop="27dp"
android:orientation="horizontal"
>
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="2"
android:orientation="vertical"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:focusable="false"
android:orientation="horizontal"
>
<ImageView
android:id="@+id/iv_poster"
android:layout_width="@dimen/episodes_list_item_height"
android:layout_height="@dimen/episodes_list_image_width"
/>
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical"
>
<TextView
android:id="@+id/tv_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<TextView
android:id="@+id/tv_release_date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
/>
<TextView
android:id="@+id/tv_rating"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:drawableLeft="@drawable/ic_star_white_24dp"
android:drawablePadding="@dimen/view_padding_small"
/>
</FrameLayout>
<TextView
android:id="@+id/tv_description"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
/>
</LinearLayout>
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/rv_seasons_list"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:focusable="false"
/>
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/rv_episodes_list"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="3"
android:focusable="false"
/>
</LinearLayout>
</FrameLayout>
项目布局，用于两个列表:
item layout, used for both lists:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="@dimen/seasons_list_item_height"
android:orientation="horizontal"
android:focusable="true"
>
<TextView
android:id="@+id/tv_title"
android:layout_width="0dp"
android:layout_height="match_parent"
android:gravity="center_vertical"
android:layout_weight="1"
/>
<TextView
android:id="@+id/tv_episodes_count"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center_vertical"
android:ems="10"
/>
</LinearLayout>
推荐答案
挖掘 Google 的 Leanback 库资源回答了我的付款人.如果你遇到同样的问题，只需用 this 并且不要忘记设置
Digging through Google's Leanback library sources answered my payers. If you face the same trouble, just wrap your RecyclerViews with this and don't forget to set
private boolean mPersistFocusVertical = false;
如果您希望在水平搜索时保持焦点，就像在我的布局中一样.
if you want the focus to be persisted when searching horizontally, like in my layout.
这篇关于Android TV 在 RecyclerViews 之间移动焦点的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
