Android TV在RecyclerView之间移动焦点 [英] Android TV move focus between RecyclerViews

问题描述

我使用以下布局构建Android TV应用程序：

左边和右边是带有垂直LinearLayoutManagers的RecyclerView，Header视图是静态的。使用D-PAD进行导航可以在一个列表中正常工作，但是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的项目5移动到列表2的项目5.当列表2很短时，有少于5个项目，它只是失去了焦点。

我想要最后聚焦项目索引保存，当用户导航list1-list2-list1时，使用该索引的项目再次获得焦点，并防止视图失去焦点。有没有什么好的解决方案？

所需的行为：
用户导航到列表的顶部，并按下向上 - 焦点停留在原来的位置，什么都没发生。
用户导航到列表的底部并按下下 - 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 - 以前有焦点在列表2中的项目获得焦点或item0获得焦点，如果以前没有焦点的话。

主布局：

 <？xml version =1.0encoding =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
> 
 
  android：id =@ + id / iv_background
 android：layout_width =match_parent
 android：layout_height =match_parent
 android：focusable =false
 /> 
 $ b $< 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 =horizo​​ntal
> 
 $ b $< 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 =horizo​​ntal
> 
 
  android：id =@ + id / iv_poster
 android：layout_width =@ dimen / episodes_list_item_height
 android：layout_height =@ dimen / episodes_list_image_width
 /> 
 $ b $< 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 $ b $ android android：layout_height =wrap_content $ b 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，用于这两个列表：

 <？xml version =1.0encoding =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 =horizo​​ntal
 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> 
  

解决方案

通过Google Leanback图书馆来源挖掘回答了我的付款人。
如果您面临同样的麻烦，只需将您的RecyclerViews与这个，不要忘记设置

pre $ private $ boolean mPersistFocusVertical = false;

如果您希望焦点在水平搜索时保持不变，就像在我的布局中一样。

I am building an Android TV app with the following layout:

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.

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?

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.

main layout:

<?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>

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>

解决方案

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;

if you want the focus to be persisted when searching horizontally, like in my layout.

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