Android 用 TalkBack 迭代 RecycleView 的隐藏项

Question

我有一个回收 View ，里面有超过 10 个项目。因为它有超过 10 个项目，所以一次只显示 4 个项目。 TalkBack 出现问题，我想通过向左/向右拖动操作来迭代列表，但在 4. 项目焦点转到布局上的另一个 View 组件上后。如何使用 Talkback 迭代 recycleview 的所有项目？

编辑: 我像这样使用我自己的辅助功能委托(delegate):

mRecyclerView.setAccessibilityDelegate(mAccessibilityDelegate);


public class AccessibilityDelegate extends View.AccessibilityDelegate {

private Assistant mAssistant;

public AccessibilityDelegate(Assistant assistant)
{
    mAssistant = assistant;
}

@Override
public void sendAccessibilityEvent(View host, int eventType) {
    if(!mAssistant.isSpeaking() && mAssistant.isRecognizerAvailable())
    {
        super.sendAccessibilityEvent(host, eventType);
    }
}

@Override
public boolean performAccessibilityAction(View host, int action, Bundle args) {
    if(!mAssistant.isSpeaking() && mAssistant.isRecognizerAvailable())
    {
        return super.performAccessibilityAction(host, action, args);
    }

    return false;
}

@Override
public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) {
    super.sendAccessibilityEventUnchecked(host, event);
}

@Override
public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) {
    return super.dispatchPopulateAccessibilityEvent(host, event);
}

@Override
public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) {
    super.onPopulateAccessibilityEvent(host, event);
}

@Override
public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) {
    super.onInitializeAccessibilityEvent(host, event);
}

@Override
public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) {
    super.onInitializeAccessibilityNodeInfo(host, info);
}

@Override
public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, AccessibilityEvent event) {
    return super.onRequestSendAccessibilityEvent(host, child, event);
}

@Override
public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) {
    return super.getAccessibilityNodeProvider(host);
}

}

Answer 1

经过几次尝试，我发现了问题。

要覆盖 RecycleView 的辅助功能，请扩展 RecyclerViewAccessibilityDelegate。

    //mRecyclerView.setAccessibilityDelegate(mAccessibilityDelegate);
    RVAccessibilityDelegate rvAccessibilityDelegate = new RVAccessibilityDelegate(mRecyclerView, mAssistant);
    mRecyclerView.setAccessibilityDelegateCompat(rvAccessibilityDelegate);

此外，如果您想禁用“显示第 1 项(共 6 项)”之类的公告，只需注释掉 super.sendAccessibilityEventUnchecked(host, event)

public class RVAccessibilityDelegate extends RecyclerViewAccessibilityDelegate {

private Assistant mAssistant;

public RVAccessibilityDelegate(RecyclerView recyclerView, Assistant assistant) {
    super(recyclerView);
    mAssistant = assistant;
}

@Override
public boolean performAccessibilityAction(View host, int action, Bundle args) {
    if(!mAssistant.isSpeaking() && mAssistant.isRecognizerAvailable())
    {
        return super.performAccessibilityAction(host, action, args);
    }

    return false;
}

@Override
public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) {
    super.onInitializeAccessibilityNodeInfo(host, info);
}

@Override
public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) {
    super.onInitializeAccessibilityEvent(host, event);
}

@Override
public void sendAccessibilityEvent(View host, int eventType) {
    if(!mAssistant.isSpeaking() && mAssistant.isRecognizerAvailable())
    {
        super.sendAccessibilityEvent(host, eventType);
    }
}

@Override
public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) {
    //super.sendAccessibilityEventUnchecked(host, event);
}

@Override
public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) {
    return super.dispatchPopulateAccessibilityEvent(host, event);
}

@Override
public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) {
    super.onPopulateAccessibilityEvent(host, event);
}

@Override
public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, AccessibilityEvent event) {
    return super.onRequestSendAccessibilityEvent(host, child, event);
}

@Override
public AccessibilityNodeProviderCompat getAccessibilityNodeProvider(View host) {
    return super.getAccessibilityNodeProvider(host);
}

}