android - 在 leanback 的标题 View 中使用多个 Orb 按钮或其他按钮

Question

是否可以在 Leanback 展示应用的自定义标题 View 中使用多个 SearchOrb 按钮或其他可聚焦按钮？问题是我只能关注一个按钮...

更新:

我做了什么:

有自定义标题 View 类，其中包含搜索球、标题 TextView 、自定义球和模拟时钟。

问题是，当我尝试关注 Search Orb 时，焦点转到自定义 Orb 上......仅此而已。仅关注自定义 Orb。

主搜索 Orb 的点击监听器已设置。我不知道问题出在哪里。如果需要，我可以按需发布其他代码。

感谢您的帮助!

标题 View .xml:

<?xml version="1.0" encoding="utf-8"?>
    <com.olegmart.smart.base.CustomTitleView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/browse_title_group"
    android:padding="16dp"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

自定义标题 View .java:

package com.olegmart.smart.base;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.support.v17.leanback.widget.SearchOrbView;
import android.support.v17.leanback.widget.TitleViewAdapter;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.ImageView;

import com.olegmart.smart.R;

public class CustomTitleView extends RelativeLayout implements TitleViewAdapter.Provider {
    private final TextView mTitleView;
    private final View mAnalogClockView;
    private final View mGridOrbView;
    private final View mSearchOrbView;

private final TitleViewAdapter mTitleViewAdapter = new TitleViewAdapter() {
    @Override
    public View getSearchAffordanceView() {
        return mSearchOrbView;
    }

    @Override
    public void setTitle(CharSequence titleText) {
        CustomTitleView.this.setTitle(titleText);
    }

    @Override
    public void setBadgeDrawable(Drawable drawable) {
        //CustomTitleView.this.setBadgeDrawable(drawable);
    }

    @Override
    public void updateComponentsVisibility(int flags) {
        /*if ((flags & BRANDING_VIEW_VISIBLE) == BRANDING_VIEW_VISIBLE) {
            updateBadgeVisibility(true);
        } else {
            mAnalogClockView.setVisibility(View.GONE);
            mTitleView.setVisibility(View.GONE);
        }*/

        int visibility = (flags & SEARCH_VIEW_VISIBLE) == SEARCH_VIEW_VISIBLE
                ? View.VISIBLE : View.INVISIBLE;
        mSearchOrbView.setVisibility(visibility);
    }

    private void updateBadgeVisibility(boolean visible) {
        if (visible) {
            mAnalogClockView.setVisibility(View.VISIBLE);
            mGridOrbView.setVisibility(View.VISIBLE);
            mTitleView.setVisibility(View.VISIBLE);

        } else {
            mAnalogClockView.setVisibility(View.GONE);
            mGridOrbView.setVisibility(View.GONE);
            mTitleView.setVisibility(View.GONE);
        }
    }
};

public CustomTitleView(Context context) {
    this(context, null);
}

public CustomTitleView(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
}

public CustomTitleView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    View root  = LayoutInflater.from(context).inflate(R.layout.custom_titleview, this);
    mTitleView = (TextView) root.findViewById(R.id.title_tv);
    mAnalogClockView = root.findViewById(R.id.clock);
    mGridOrbView = root.findViewById(R.id.grid_orb);

    mSearchOrbView = root.findViewById(R.id.search_orb);
}

public void setTitle(CharSequence title) {
    if (title != null) {
        mTitleView.setText(title);
        mTitleView.setVisibility(View.VISIBLE);
        mGridOrbView.setVisibility(View.VISIBLE);
        mAnalogClockView.setVisibility(View.VISIBLE);
    }
}


public void setBadgeDrawable(Drawable drawable) {
    if (drawable != null) {
        mTitleView.setVisibility(View.GONE);
        mGridOrbView.setVisibility(View.VISIBLE);
        mAnalogClockView.setVisibility(View.VISIBLE);
    }
}

@Override
public TitleViewAdapter getTitleViewAdapter() {
    return mTitleViewAdapter;
}
}

custom_titleview.xml:

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

    <android.support.v17.leanback.widget.SearchOrbView
        android:id="@+id/search_orb"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:transitionGroup="true"
        android:layout_gravity="center_vertical|start"
        android:layout_marginTop="8dp"
        android:paddingStart="48dp"
        android:focusable="true"
        android:nextFocusRight="@+id/grid_orb"
        />

    <AnalogClock
            android:id="@+id/clock"
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:padding="6dp"
            android:layout_alignParentEnd="true"
            android:layout_gravity="center_vertical|end"
            android:layout_marginEnd="24dp" />

    <android.support.v17.leanback.widget.SearchOrbView
        android:id="@+id/grid_orb"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="24dp"
        android:layout_centerVertical="true"
        android:layout_toStartOf="@id/clock"
        android:nextFocusLeft="@+id/search_orb"
        android:focusable="true"
        />



    <TextView
            android:id="@+id/title_tv"
            android:textAppearance="@android:style/TextAppearance.Large"
            android:visibility="gone"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="24dp"
            android:layout_centerVertical="true"
            android:layout_toStartOf="@id/grid_orb" />

</merge>

Answer 1

Teng-pao Yu 是正确的....BrowseFragment 中的 OnFocusSearchListener 是焦点变化没有如您预期的那样发生的原因。

先介绍一下背景......

当发生焦点搜索时，它将首先调用当前 ViewGroup 中的 focusSearch 方法。在这种情况下，虽然搜索球体具有当前焦点，并且用户按下方向键将焦点放在不同的方向，但焦点搜索的第一个回调将在您的 CustomTitleView 类中。只有在 CustomTitleView 将 focusSearch 传播到 BrowseFragment 的 OnFocusSearchListener 的父级之后。

这里真正的问题是(在撰写本文时)，Leanback BrowseFragment 的 OnFocusSearchListener 已编码，因此您添加到 CustomTitleLayout 的其他 View 实际上永远无法获得焦点。

但是，有一种方法可以在您的 CustomTitleLayout 中聚焦其他 subview ....

如下面的代码示例所示，重写 CustomTitleLayout 中的 focusSearch 方法，并返回自定义标题布局中存在的可聚焦 View (与返回 super.focusSearch 相反)。

请注意，此代码取决于对 CustomTitleView 的 subview 设置 nextFocusLeft 和 nextFocusRight 属性。此外， subview 必须是可聚焦的 View (按钮等)。如果 subview 在默认情况下不可聚焦(类似于 TextView)，您将必须手动启用 View 以通过 XML 使用 android:focusable="true" 或在代码中使用 View.setFocusable(true).

public class CustomTitleView extends RelativeLayout implements TitleViewAdapter.Provider {

    .... all your custom view stuff....

    @Override
    public View focusSearch(View focused, int direction) {

        View nextFoundFocusableViewInLayout = null;

        // Only concerned about focusing left and right at the moment
        if (direction == View.FOCUS_LEFT || direction == View.FOCUS_RIGHT) {

            // Try to find the next focusable item in this layout for the supplied direction
            int nextFoundFocusableViewInLayoutId = -1;
            switch(direction) {
                case View.FOCUS_LEFT :
                    nextFoundFocusableViewInLayoutId = focused.getNextFocusLeftId();
                    break;
                case View.FOCUS_RIGHT :
                    nextFoundFocusableViewInLayoutId = focused.getNextFocusRightId();
                    break;
            }

            // View id for next focus direction found....get the View
            if (nextFoundFocusableViewInLayoutId != -1) {
                nextFoundFocusableViewInLayout = findViewById(nextFoundFocusableViewInLayoutId);
            }
        }

        //  Return the found View in the layout if it's focusable
        if (nextFoundFocusableViewInLayout != null && nextFoundFocusableViewInLayout.isFocusable()) {
            return nextFoundFocusableViewInLayout;
        } else {
            // No focusable view found in layout...propagate to super (should invoke the BrowseFrameLayout.OnFocusSearchListener
            return super.focusSearch(focused, direction);
        }
    }

    @Override
    protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
        // Gives focus to the SearchOrb first....if not...default to normal descendant focus search
        return getSearchAffordanceView().requestFocus() || super.onRequestFocusInDescendants(direction, previouslyFocusedRect);
    }
}