android - 无法动态设置显示类转换异常的包含文件中存在的相对布局的布局参数

Question

     <?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/parentLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="">
    <include android:id="@+id/contentLayout" layout="@layout/content_our_story" />
</android.support.design.widget.CoordinatorLayout>

content_our_story.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context=""
    android:layout_margin="5dp"
    tools:showIn="@layout/activity_our_story">


</RelativeLayout>

设置布局参数代码：

contentLayout = (RelativeLayout) findViewById(R.id.contentLayout);
  RelativeLayout.LayoutParams param=new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT);
        param.setMargins(0,0,0,0);
        contentLayout.setLayoutParams(param);

当我尝试使用“contentLayout”的 id 设置 LayoutParams 时，它会显示类转换异常并期望它是协调器布局。但是，它包含如上所示的相对布局。请建议。

Answer 1

您需要使用要将参数设置为的视图的父布局的 LayoutParams：

CoordinatorLayout.LayoutParams param=new CoordinatorLayout.LayoutParams(CoordinatorLayout.LayoutParams.MATCH_PARENT, CoordinatorLayout.LayoutParams.MATCH_PARENT);