Why would layout_width=“wrap_content” take up the entire width of the screen?

问题

With this xml:

<TableRow >
    <Button
        android:id="@+id/buttonNext"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Next"
        android:textAppearance="?android:attr/textAppearanceMedium" />
</TableRow>

I would expect "wrap_content" to only be as wide as necessary to display the text on the button, but the button monopolizes the entire width of the screen...?

回答1:

Your problem is that the width specification in your xml is ignored. From the docs for TableRow:

The children of a TableRow do not need to specify the layout_width and layout_height attributes in the XML file. TableRow always enforces those values to be respectively MATCH_PARENT and WRAP_CONTENT.

P.S. Did you have a compelling reason to use absolute pixels? That's generally considered bad practice.

P.P.S. Double-posting my answer to go with the double-posting of your question. :)

回答2:

Have you looked at this question?

Button width in Android TableLayout

The issue could be caused by using android:stretchColumns="*" in your TableLayout, but it is difficult to tell without the rest of your XML.

回答3:

Dont understand....
Cant see layout_width attribute,layout_height attribute for TableRow.no Elements can be without these attributes.

来源：https://stackoverflow.com/questions/8369254/why-would-layout-width-wrap-content-take-up-the-entire-width-of-the-screen