禁用对片段的关注 [英] Disable focus on fragment

问题描述

我正在为电视平台开发应用程序，并使用RCU进行导航.

I'm working on application for TV platform and use RCU for navigation.

我有一个用例，我有两个彼此叠在一起的片段，并且同时在屏幕上可见.

I have use case where I have two fragments one above each other and visible on the screen at the same time.

是否有一种方法可以禁用下面的聚焦片段? 片段视图上的setFocusable(false)不起作用，我可以将元素集中在下面的片段中.

Is there a way to disable focusing fragment that is below? setFocusable(false) on fragments view doesnt work, and I'm able to focus elements in fragment below.

谢谢.

推荐答案

我最后提出的解决方案是:

The solution that I've come up with in the end is:

为片段添加了自定义生命周期侦听器，即: onFragmentResume 和 onFragmentPause 事件，这些事件在我需要显示/隐藏或切换时手动调用片段之间.

Added custom Lifecycle listeners for the fragment namely: onFragmentResume and onFragmentPause events which I call manually when I need to show/hide or switch between fragments.

@Override
public void onFragmentResume() {

    //Enable focus
    if (getView() != null) {

        //Enable focus
        setEnableView((ViewGroup) view, true);

        //Clear focusable elements
        focusableViews.clear();
    }

    //Restore previous focus
    if (previousFocus != null) {
        previousFocus.requestFocus();
    }
}

@Override
public void onFragmentPause() {

    //Disable focus and store previously focused
    if (getView() != null) {

        //Store last focused element
        previousFocus = getView().findFocus();

        //Clear current focus
        getView().clearFocus();

        //Disable focus
        setEnableView((ViewGroup) view, false);
    }
}

/**
 * Find focusable elements in view hierarchy
 *
 * @param viewGroup view
 */
private void findFocusableViews(ViewGroup viewGroup) {

    int childCount = viewGroup.getChildCount();
    for (int i = 0; i < childCount; i++) {
        View view = viewGroup.getChildAt(i);
        if (view.isFocusable()) {
            if (!focusableViews.contains(view)) {
                focusableViews.add(view);
            }
        }
        if (view instanceof ViewGroup) {
            findFocusableViews((ViewGroup) view);
        }
    }
}

/**
 * Enable view
 *
 * @param viewGroup
 * @param isEnabled
 */
private void setEnableView(ViewGroup viewGroup, boolean isEnabled) {

    //Find focusable elements
    findFocusableViews(viewGroup);

    for (View view : focusableViews) {
        view.setEnabled(isEnabled);
        view.setFocusable(isEnabled);
    }
}

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