使用D-PAD时列出视图焦点 [英] List view Focus while using D-PAD

问题描述

在我的图像中有一个侧边栏和ListView，我使用D-PAD访问每个Button. 当侧栏搜索按钮具有焦点并且我按向右D-PAD按钮时，我希望焦点移到ListView的第一项.但是，就我而言，它转到第二项.如果向下箭头具有焦点，并且我按向右按钮，它将转到第4个列表项.因此，我也需要防止这种情况.如何将焦点移至第一个?

In my Image there is a sidebar and ListView there, I access every Button by using D-PAD. When side bar search button has focus and I press right D-PAD button, I want the focus to go to the ListView's first item. But, in my case it goes to the second item. If Down arrow has focus and i press right button it goes to 4th list item.So , i need to prevent this also.How to move the focus to the 1st one?

if (Search != null && Search.hasFocus()) {
            // Search.setNextFocusRightId(R.id.listView);
//          listView.smoothScrollToPosition(0);
            listView.setChoiceMode(1);
            listView.setItemChecked(0, true);
        }

推荐答案

最好的方法是在Activity类中重写dispatchKeyevent，然后将焦点/选择设置为Listview中您想要的任何位置.

The best thing to do is Override the dispatchKeyevent in your Activity class then set the focus/selection to the place wherever you like in Listview .

    @Override
public boolean dispatchKeyEvent(KeyEvent event) {




    boolean handled  =  super.dispatchKeyEvent(event);

    if(!handled  &&  event.getAction() ==  KeyEvent.ACTION_UP)
    {
        if(yourParentViewGroup.getFocusedChild() is  your SearchView &&  event.getKeyCode() ==  KeyEvent.KEYCODE_DPAD_RIGHT )
        {

            yourListvIew.setSelction(0);
            handled = true;
        }

    }

    return handled;

但是如果要处理Focus或选择逻辑，请记住返回"true"，否则它将调用android focusfinder算法，并且焦点/选择将移至最近的View.

But remember to return "true" if you are going to handle the Focus or selection logic else it will invoke android focusfinder algorithm and focus/selection will shift to the nearest View.

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