Question

我的布局包含一个LinearLayout，其中包含一个按钮时。

通货膨胀之后，还会以编程方式添加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，如下所示：

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，似乎不是一个方法setNextFocusDown(View) - 所以我无法找到实现这一目标的方法，除了嵌套以编程方式创建虚拟父布局中的视图 - 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)
}

以编程方式创建的视图中的Android setNextFocusDown

1 个答案: