PercentRelativeLayout，如何以编程方式设置高度

Question

我使用的是android %支持包中的PercentRelativeLayout。这是我的布局。

<android.support.percent.PercentRelativeLayout
    android:id="@+id/view_parent"
    app:layout_heightPercent="68%" android:visibility="invisible"
    android:layout_width="match_parent"
    android:background="@color/mountain_meadow" android:layout_alignParentTop="true"
    android:layout_height="wrap_content">

    <View android:id="@+id/view_child" android:layout_width="match_parent" app:layout_heightPercent="30%"
        android:layout_alignParentBottom="true"
        />
</android.support.percent.PercentRelativeLayout>

我想以编程方式改变view_child的高度。我如何使用PercentRelativeLayout.LayoutParams或任何其他方式做到这一点

Answer 1

是否要设置一个新的百分比值?如果是，则需要:

View view = findViewById(R.id.view_child);
PercentRelativeLayout.LayoutParams params = (PercentRelativeLayout.LayoutParams) view.getLayoutParams();
// This will currently return null, if it was not constructed from XML.
PercentLayoutHelper.PercentLayoutInfo info = params.getPercentLayoutInfo();
info.heightPercent = 0.60f;
view.requestLayout();