可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试):
问题:
I'm trying to horizontally center several views in a RelativeLayout that is a base.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="center_horizontal" android:background="@android:color/transparent" >
This isn't working. I have set centerInParent to true for one of the views and that did work. However, I can't use this solution because I have 2 views side by side that need to be centered together. Trying to optimize this so I want to avoid nesting layouts, especially Linear, inside of each other.
Is there something obvious that I'm missing? I thought this attribute is made for this situation.
回答1:
I answered a similar issue involving three views without using nested ViewGroups.
https://stackoverflow.com/a/13279846/1011746
This is tested in API 11.
For the two view horizontal case:
<RelativeLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="center" android:background="@android:color/black" > <Button android:id="@+id/apply" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="APPLY" android:textSize="20sp" /> <Button android:id="@+id/undo" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="UNDO" android:textSize="20sp" android:layout_toRightOf="@id/apply" /> </RelativeLayout>
For the two view vertical case:
<RelativeLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="center" android:background="@android:color/black" > <Button android:id="@+id/apply" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="APPLY" android:textSize="20sp" /> <Button android:id="@+id/undo" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="UNDO" android:textSize="20sp" android:layout_below="@id/apply" /> </RelativeLayout>
回答2:
You'll need to nest several layouts together. To center something in a RelativeLayout, you use android:layout_centerInParent="true" on the child. If you try to center several childs, they'll end up under/over each other.
Therefore, for example, you could use a LinearLayout with two views as a child to the RelativeLayout, with the LinearLayout having android:orientation="horizontal" and android:layout_centerInParent="true". The LinearLayout should now be centered in the RelativeLayout, with the two children next to each other.
回答3:
Wrap the two views in a LinearLayout and then center the LinearLayout in the RelativeLayout like you did for the single TextView.
回答4:
So my fix for this issue turn out just to leverage the compound drawable feature of textview. I just trashed the button and used drawableRight to show the search icon.
