如何以编程方式设置 Android ActionBar 的下一个可聚焦控件

Question

我正在为谷歌电视开发一个应用程序，其中所有的导航都将使用D-Pad/键盘完成。

"我的活动"有一个ActionBar，下面有几个横向的Lists；C。列出B&C根据列表的选定项加载数据A。。因此它们可以/可以不加载数据。

问题是，当ActionBar有焦点并且我按下DOWN D-Pad键时，焦点会丢失，并且不会转移到ListC（或者B，如果C没有数据）。。y

为了实现这一点，我尝试用程序设置ActionBar的下一个可聚焦视图，就像下面的一样

getActionBar().getCustomView().setNextFocusDownId(R.Id.list_C_id);

但没有起作用。

我还尝试使用层次结构查看器检查布局层次结构。。。但坦率地说，我不明白该如何处理它的发现。

如何通过编程设置Android ActionBar的下一个可聚焦控件？？

非常感谢您的帮助。

活动的XML如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/mainContainer" style="@style/main" >
<!-- Splash Screen -->
<LinearLayout
    android:id="@+id/splash_screen"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/welcome"
    android:orientation="vertical" >
</LinearLayout> 
<!-- main content holder.. it is shown afetr some time of showing above splash screen -->
<LinearLayout
    android:id="@+id/main_content_screen"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    android:focusable="true"
    android:visibility="invisible">
    <!-- All Packages List -->
    <LinearLayout
        android:layout_width="205dp"
        android:layout_height="match_parent"
        android:background="@drawable/content_round_bg"
        android:focusable="true"
        android:orientation="vertical" >
        <!-- Header of Packages-->
        <RelativeLayout
            style="@style/marginLeft5"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"                
            android:background="@drawable/content_round_bg" >
            <ImageView
                android:id="@+id/packagesIcon"
                style="@style/titleIcon"
                android:src="@drawable/packages" >
            </ImageView>
            <TextView
                style="@style/title"
                android:layout_toRightOf="@+id/packagesIcon"
                android:text="Packages" >
            </TextView>
            <ProgressBar
                android:id="@+id/progressBarPackages"
                style="@style/progressBar" />
        </RelativeLayout>
        <!-- <View style="@style/horizontalSeperator" /> -->
        <ListView
            android:id="@+id/allPackagesList"
            style="@style/list"
            android:nextFocusRight="@+id/gridChannels">
        </ListView>
        <!-- Message which is hidden by default and is made visible if list has no data -->
        <LinearLayout
            android:id="@+id/packageNotFound"
            style="@style/emptyListIdentifier" >
            <ImageView
                style="@style/titleIcon"
                android:src="@drawable/info" >
            </ImageView>
            <TextView
                style="@style/emptyListIdentifierText"
                android:layout_marginLeft="5dp"
                android:text="Packages not available" >
            </TextView>
        </LinearLayout>
    </LinearLayout>
    <View style="@style/verticalSeperator" />
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:focusable="true"
        android:orientation="vertical" >
        <LinearLayout
            android:id="@+id/relativeLayout1"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:focusable="true"
            android:layout_below="@+id/titleContainer" >
            <LinearLayout
                android:id="@+id/channelsContainer"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="0.35"
                android:background="@drawable/content_round_bg"
                android:focusable="true"
                android:orientation="vertical" >
                <!-- Header of Channels-->
                <RelativeLayout
                    style="@style/marginLeft5"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@drawable/content_round_bg" >
                    <ImageView
                        android:id="@+id/channelsIcon"
                        style="@style/titleIcon"
                        android:src="@drawable/channels" >
                    </ImageView>
                    <TextView
                        style="@style/title"
                        android:layout_toRightOf="@+id/channelsIcon"
                        android:text="Channels" >
                    </TextView>
                    <ProgressBar
                        android:id="@+id/progressBarChannels"
                        style="@style/progressBar" />
                </RelativeLayout>
                <RelativeLayout style="@style/listsContiner" android:focusable="true" >
                    <GridView
                        android:id="@+id/gridChannels"
                        style="@style/grid"
                        android:divider="#10F1F1F1"
                        android:nextFocusLeft="@+id/allPackagesList"
                        android:nextFocusRight="@+id/gridAllVODs"
                        android:numColumns="2" />
                </RelativeLayout>
                <!-- Message which is hidden by default and is made visible if list has no data -->
                <RelativeLayout
                    android:id="@+id/channelsNotFound"
                    style="@style/emptyListIdentifier" >
                    <ImageView
                        android:id="@+id/NoChannelsIcon"
                        style="@style/titleIcon"
                        android:src="@drawable/info" >
                    </ImageView>
                    <TextView
                        style="@style/emptyListIdentifierText"
                        android:layout_toRightOf="@+id/NoChannelsIcon"
                        android:text="Channels are currently not available" >
                    </TextView>
                </RelativeLayout>
            </LinearLayout>
            <View style="@style/verticalSeperator" />
            <LinearLayout
                android:id="@+id/vodsContainer"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="0.65"                    
                android:background="@drawable/content_round_bg"
                android:orientation="vertical" >
                 <!-- Header of VODs-->
                <RelativeLayout
                    style="@style/marginLeft5"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@drawable/content_round_bg" >
                    <ImageView
                        android:id="@+id/VODsIcon"
                        style="@style/titleIcon"
                        android:src="@drawable/vod" >
                    </ImageView>
                    <TextView
                        style="@style/title"
                        android:layout_toRightOf="@+id/VODsIcon"
                        android:text="VOD" >
                    </TextView>
                    <ProgressBar
                        android:id="@+id/progressBarVODs"
                        style="@style/progressBar" />
                </RelativeLayout>                    
                <RelativeLayout style="@style/listsContiner" >
                    <GridView
                        android:id="@+id/gridAllVODs"
                        style="@style/grid"
                        android:divider="#10F1F1F1"
                        android:nextFocusLeft="@+id/gridChannels"
                        android:nextFocusRight="@+id/allPackagesList"
                        android:numColumns="1" />
                </RelativeLayout>
                <!-- Message which is hidden by default and is made visible if list has no data -->
                <RelativeLayout
                    android:id="@+id/videosNotFound"
                    style="@style/emptyListIdentifier" >
                    <ImageView
                        android:id="@+id/NoVODsIcon"
                        style="@style/titleIcon"
                        android:src="@drawable/info" >
                    </ImageView>
                    <TextView
                        style="@style/emptyListIdentifierText"
                        android:layout_centerInParent="true"
                        android:layout_toRightOf="@+id/NoVODsIcon"
                        android:text="Videos are currently not available" >
                    </TextView>
                </RelativeLayout>
            </LinearLayout>
        </LinearLayout>
    </RelativeLayout>
</LinearLayout>

每个列表/网格的所有容器都设置了android:focuable="true"直接或按其风格。

编辑：准确描述spp屏幕的示例应用程序可以从此处下载

请在第一个列表中包括。您可以通过main.xml文件中的idallPackagesList来搜索它。我忘了插入。对不起

此应用程序中的问题是：

1. 焦点不是来自ActionBar项的List/Grids
2. ActionBar项目之间的导航需要多次按下D-Pad"LEFT"或"RIGHT"才能移动

Answer 1

List是否封装在另一个容器中？尝试为您的列表及其容器添加android:focutable="true"。。