安卓基础之按比例布局layout_weight和weightSum / 憋错料

再看开发文档中对layout_weight属性的描述：

“定义weight总和的最大值。如果未指定该值，以所有子视图的layout_weight属性的累加值作为总和的最大值。一个典型的案例是：通过指定子视图的layout_weight属性为0.5，并设置LinearLayout的weightSum属性为1.0，实现子视图占据可用宽度的50。”

XML文件仅仅包含一个Button，它的宽度占据整个屏幕的一半，代码如下：

[html] view
plain copy

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ffffff"
android:gravity="center"
android:orientation="horizontal"
android:weightSum="1" >
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.5"
android:text="@string/activity_main_click_me" />
</LinearLayout>

在上面的xml中，指定Button的android:layout_width属性为0dp，因此需要根据android:weightSum属性决定Button的width。

假设有一个宽度是200dp，android:weightSum属性是1.0的LinearLayout。

在这个LinearLayout中的Button宽度的计算公式如下：

[plain] view
plain copy

Button‘s width + Button‘s weight * 200 / sum(weight)

指定Button的width为0dp，weight为0.5，sum(weight)等于1，那么结果如下。

0 + 0.5 * 200 / 1 = 100

当需要根据比例分配布局可用空间的时候，使用LinearLayout的weight属性是很有必要的，这避免了使用硬编码的方式带来的副作用。

如果目标平台是Honeycomb并且使用Fragment，那么大多数案例中都是使用weight在布局文件中为Fragment分配空间。

深入理解如何使用weight会为开发者增添一项重要技能。

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时间： 2024-10-05 05:02:07

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