以编程方式在“百分比相对布局”中设置纵横比

Question

我想以编程方式在PercentRelativeLayout内为我的FrameLayout设置纵横比。

我已经在xml中尝试过，它正在工作：

<android.support.percent.PercentRelativeLayout 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:background="#000"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <FrameLayout
        app:layout_widthPercent="100%"
        app:layout_aspectRatio="178%" //aspect ratio
        android:orientation="vertical"
        android:id="@+id/liveTV_frame"
        android:layout_marginBottom="50dp"
        android:layout_centerInParent="true"
        android:background="@android:color/background_dark"
        android:keepScreenOn="true">
    </FrameLayout>
</android.support.percent.PercentRelativeLayout>

但我需要以编程方式设置它。

我该怎么做？

Answer 1

PercentRelativeLayout layout = ...;
PercentRelativeLayout.LayoutParams layoutParams 
           = (PercentRelativeLayout.LayoutParams) layout.getLayoutParams();
layoutParams.getPercentLayoutInfo().aspectRatio = ...; // float value
layout.requestLayout();

Answer 2

从 @azizbekian 答案 只是 我详细说明了我的答案，

不使用分数，设置百分比的浮点值：

 PercentRelativeLayout.LayoutParams params = (PercentRelativeLayout.LayoutParams) mFlPromoVideoContainer.getLayoutParams();
        PercentLayoutHelper.PercentLayoutInfo info = params.getPercentLayoutInfo();
        info.widthPercent = 1f;
        info.aspectRatio = 1.78f;//178%
        mFlPromoVideoContainer.requestLayout();

您可以在 XML 中指定分数，如下所示：

<item name="aspect_ratio" type="fraction">178%</item>

在爪哇，

 PercentRelativeLayout.LayoutParams params = (PercentRelativeLayout.LayoutParams) mFlPromoVideoContainer.getLayoutParams();
        PercentLayoutHelper.PercentLayoutInfo info = params.getPercentLayoutInfo();
        info.widthPercent = 1f;
        info.aspectRatio = getResources().getFraction(R.fraction.aspect_ratio, 1, 1);
        mFlPromoVideoContainer.requestLayout();