attrs.xml中android:gravity的正确格式? [英] Correct format for android:gravity in attrs.xml?
问题描述
我有以下情况:
在styles.xml
中:
<style name="fooStyle">
<item name="android:padding">?fooView.padding</item>
<item name="android:background">?fooView.background</item>
<item name="android:gravity">?fooView.gravity</item>
</style>
attrs.xml
中:
<attr name="fooView.padding" format="dimension" />
<attr name="fooView.background" format="color|reference" />
<attr name="fooView.gravity" format="????"/>
themes.xml
中:
<style name="fooViewTheme" parent="android:Theme">
<item name="fooView.padding" >2dip</item>
<item name="fooView.background" >#AA000000</item>
<item name="fooView.gravity">right|bottom</item>
</style>
问题是我无法弄清楚fooView.gravity
的格式是什么.我已经尝试过string
,enum
和flag
,但是似乎都没有用:只要加载了使用该主题的视图,我总是会得到一个java.lang.NumberFormatException: unable to parse 'right|bottom' as integer
.
The problem is that I cannot figure out what the format for the fooView.gravity
should be. I've already tried with string
, enum
and flag
but none seem to work: I always get a java.lang.NumberFormatException: unable to parse 'right|bottom' as integer
as soon as the view that uses this theme gets loaded.
感谢所有答案.
推荐答案
这些是Android使用的重力值.您可以在attrs.xml
中使用它:
Those are the gravity values used by Android. You can use that in your attrs.xml
:
<resources>
<declare-styleable name="MyCustomView">
<attr name="gravity">
<flag name="bottom" value="80" />
<flag name="center" value="17" />
<flag name="center_horizontal" value="1" />
<flag name="center_vertical" value="16" />
<flag name="clip_horizontal" value="8" />
<flag name="clip_vertical" value="128" />
<flag name="end" value="8388613" />
<flag name="fill" value="119" />
<flag name="fill_horizontal" value="7" />
<flag name="fill_vertical" value="112" />
<flag name="left" value="3" />
<flag name="right" value="5" />
<flag name="start" value="8388611" />
<flag name="top" value="48" />
</attr>
</declare-styleable>
</resources>
在布局XML中,您可以通过以下方式使用它:
In your layout XML you can use it this way:
<MyCustomView
custom:gravity="center|bottom"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
在Java代码中,您可以使用以下代码读取值:
And in Java code you can read the value using this:
int gravity = a.getInt(R.styleable.MyCustomView_gravity, Gravity.NO_GRAVITY);
并直接将其设置为子视图(如果您认为合适的话):
and directly set it to a sub view, if that makes sense for you:
someSubView.setGravity(gravity);
您可以在android.view.Gravity
或这里
这篇关于attrs.xml中android:gravity的正确格式?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!