奇怪的（可能是愚蠢的）尝试将视图膨胀为扩展 View 对象的实例

发布于 2024-12-09 09:25:25 字数 688 浏览 0 评论 0原文

我创建了一个 TableRow 布局模型，将其用作扩展 TableRow 的自定义视图的模板。

我的愿望是膨胀扩展类中的行，并使该膨胀的实例成为扩展行。

用伪代码：

public class MyTableRow extends TableRow{
    if(conditionA)
       this = (TableRow)inflate(R.layout.myModelRowA);
    if(conditionB)
       this = (TableRow)inflate(R.layout.myModelRowB);
    etc...
}

然后，当我将这些行添加到表中时，我会像往常一样继续...

myTable.addView(new MyTableRow(this));

所以，问题是，显然我无法将事物分配给this，即使在逻辑上也是如此这是完全有道理的，因为在上面的示例中 this 是一个 TableRow。

还有其他方法可以做到这一点吗？我知道这看起来很愚蠢，但我当前的替代方案是将膨胀的 TableRow 作为 MyTableRow 的成员，这可以工作，但真的很难看（并且感觉不是很 OO）。

我错过了一些明显的事情吗？或者我应该满足于我所拥有的吗？

原文

I have created a TableRow layout model which I'm using as a template for a custom View that extends TableRow.

My desire is to inflate the row inside the extended class, AND have that inflated instance BE the extended row.

In pseudo code:

public class MyTableRow extends TableRow{
    if(conditionA)
       this = (TableRow)inflate(R.layout.myModelRowA);
    if(conditionB)
       this = (TableRow)inflate(R.layout.myModelRowB);
    etc...
}

And then when I'm adding these rows to the table I'd proceed as usual...

myTable.addView(new MyTableRow(this));

So, the issue is that obviously I can't assign things to this even if logically it makes perfect sense, since in the example above this is a TableRow.

Is there another way to do this? I know it looks stupid, but my current alternative is to house the inflated TableRow as a member of MyTableRow, which works, but is really ugly (and doesn't feel very OO).

Am I missing something obvious? Or should I just settle for what I have?

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ゞ花落谁相伴 2024-12-16 09:25:25

使用标签定义 A 行和 B 行布局（请参阅此处）而不是：

<merge xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Other component declarations here  -->
</merge>

然后在扩展行构造函数中膨胀这些布局之一：

public MyTableRow(Context context, AttributeSet attrs) {
    super(context, attrs);
    if (condA) {
        inflate(context, R.layout.RowA, this);
    } else {
        inflate(context, R.layout.RowB, this);
    } 
}

然后在表布局中使用扩展行而不是 TableRow：

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:stretchColumns="1">

    <your.package.name.MyTableRow>

    </your.package.name.MyTableRow>

</TableLayout>

Define your Row A and Row B layouts with tag <merge> (see here) instead of <TableRow>:

<merge xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Other component declarations here  -->
</merge>

then inflate one of these layouts in your extended row constructor:

public MyTableRow(Context context, AttributeSet attrs) {
    super(context, attrs);
    if (condA) {
        inflate(context, R.layout.RowA, this);
    } else {
        inflate(context, R.layout.RowB, this);
    } 
}

Then in your Table layout use your extended Row instead of TableRow:

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:stretchColumns="1">

    <your.package.name.MyTableRow>

    </your.package.name.MyTableRow>

</TableLayout>

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