材料卡中的子视图视图缩小和消失

android.support.design.card.MaterialCardView 已在本机中使用 axml 布局并具有子视图,如下所示,我的目标是不断切换边框,即在发生某些事件时进行笔画,例如:按钮单击并还原它,但 strokeWidth 子视图逐渐缩小,最后宽度和高度变为0,使内部视图完全消失。

材料卡视图布局代码:

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.card.MaterialCardView  
              xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:app="http://schemas.android.com/apk/res-auto"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent"
              android:layout_margin="10dp"
              app:cardCornerRadius="10dp"
              app:strokeColor="#123456"
              app:strokeWidth="3dp"
              android:id="@+id/material_card"
              android:padding="5dp"
              android:layout_gravity="center_horizontal">
              <LinearLayout android:layout_width="fill_parent"
                              android:layout_height="240dp"
                              android:orientation="vertical"
                            android:padding="8dp"
                            android:id="@+id/linearLayoutCard">
                <Button android:id="@+id/button"
                        android:text="Click me"
                        android:layout_width="fill_parent"
                        android:layout_height="wrap_content"/>
                <TextView android:id="@+id/textview"
                          android:text ="Border in"
                          android:layout_below="@id/button"
                          android:layout_width="fill_parent"
                          android:layout_height="wrap_content"/>
              </LinearLayout>
</android.support.design.card.MaterialCardView>

页面呈现程序代码

  public void OnClick(Android.Views.View v)
        {
            // throw new NotImplementedException();
            if (_yes)
            {
                material_card.StrokeColor = Android.Graphics.Color.ParseColor("#FFFFFF");
                material_card.StrokeWidth = 0;
                //material_card.LayoutParameters.LayoutAnimationParameters
                linearLayoutCard?.SetMinimumHeight(material_card.Height+20);
                linearLayoutCard?.SetMinimumWidth(material_card.Width+20);
                linearLayoutCard.SetPadding(0, 0, 0, 0);
                textview.Text = "Border out";
                _yes = false;
               // return true;
            }
            else
            {
                material_card.StrokeColor = Android.Graphics.Color.ParseColor("#123456");
                material_card.StrokeWidth = 20;
                linearLayoutCard?.SetMinimumHeight(material_card.Height);
                linearLayoutCard?.SetMinimumWidth(material_card.Width);
                linearLayoutCard.SetPadding(0, 0, 0, 0);
                textview.Text = "Border in";
                _yes = true;
                //return true;
            }
        }

点击几下后:

我尝试使用其他布局 RelativeLayout 它起作用,还尝试增加线性布局的高度和宽度,并将填充设置为0到min,如上所述,这也不起作用,当调试时,我注意到填充会触发 MaterialCardView 这可能导致它收缩。 还尝试将cardview的padding设置为0,但仍然没有运气。

material_card.SetPadding(0, 0, 0, 0);
linearLayoutCard.LayoutParameters.Width = material_card.Width;
linearLayoutCard.LayoutParameters.Height =material_card.Height;

为什么内部视图自映射到 match_parent / fill_parent ?

Github的完整代码: github.com/pmahend1/TestMaterialCardView