Android 在以编程方式创建的视图上设置 NextFocusDown

Question

我的布局包含一个 LinearLayout，其中在展开时包含一个按钮。

在 inflation 之后，又以编程方式添加了 3 个视图，我希望能够做的是将初始按钮的 nextFocusDown 设置为循环中第一个创建的视图，就像这样:

ImageButton btnBack = (ImageButton) this.findViewById(btnBack);

forV(x=0;x<=45;x++) {

    LayoutInflater inflater = (LayoutInflater) _c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    LinearLayout l = (LinearLayout) inflater.inflate(R.layout.my_great_item, null);

    // what I really want to be able to do here is something like
    // if(x==0) btnBack.setNextFocusDown(l);
    // but here there only exists the method setNextFocusDownId - I can't pass a view directly to the function.

    l.setFocusable(true);
    l.setClickable(true);

    ...

    l.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        ...
    });

    l.setOnClickListener(new View.OnClickListener() {
       ...
    });

   mybaseview.addView(l)
}

问题是，根据评论，似乎没有方法 setNextFocusDown(View) - 所以除了将以编程方式创建的视图嵌套在虚拟父布局 - 但我想尽可能避免这种情况。

Answer 1

创建文件values/ids.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <item name="your_custom_id" type="id"/>
</resources>

比这样更改代码：

ImageButton btnBack = (ImageButton) this.findViewById(btnBack);

for(x=0;x<=45;x++) {
    LayoutInflater inflater = (LayoutInflater) _c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    LinearLayout l = (LinearLayout) inflater.inflate(R.layout.my_great_item, null);

    if (x==0) {
        l.setId(R.id.your_custom_id);
        btnBack.setNextFocusDown(R.id.your_custom_id);
    }

    l.setFocusable(true);
    l.setClickable(true);

    ...

    l.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        ...
    });

    l.setOnClickListener(new View.OnClickListener() {
       ...
    });

   mybaseview.addView(l)
}

Android 在以编程方式创建的视图上设置 NextFocusDown

Android setNextFocusDown on programatically created view

layout

android

focus