Question

我遇到类似这个问题的问题findViewById returns null on a LinearLayout inside an <include>d view

我有类似的问题：

调用include块的xml：

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
            ...>
    <include  
                android:id="@+id/popupMenu"
                layout="@layout/mainmenu_popup" /> 
    </RelativeLayout>

和mainmenu_popup.xml包含所包含的代码：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:visibility="gone"
        android:layout_marginTop="@dimen/action_bar_height"
        android:layout_width="0dp"
        android:layout_height="0dp">
      <fragment
        android:id="@+id/mainmenupopup_fragment"
        class="RetailMobile.MainMenuFragment" />
    <TextView
            android:layout_width="fill_parent"
            android:layout_height="1dp"
            android:layout_below="@id/mainmenupopup_fragment" 
            android:background="@color/dark_blue"
            android:id="@+id/blueLine" />
    <RelativeLayout
        ...
    </RelativeLayout>
</RelativeLayout>

我遵循Luksprog的回答

RelativeLayout popupMenu = this.Activity.FindViewById<RelativeLayout>(Resource.Id.popupMenu);

但popupMenu == null

我还检查了这个帖子findViewById not working for an include?但没有给出正面结果。

Answer 1

将android:id添加到mainmenu_popup.xml中的RelativeLayout，然后按ID定义的视图查找

Answer 2

我找到了解决方案 mainmenu_popup.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/popup_mainmenu">
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/popup_mainmenu_inner"> ...

然后我引用popup_mainmenu_inner：

 this.Activity.FindViewById<RelativeLayout>(Resource.Id.popup_mainmenu_inner);

findViewById在include的内部视图上返回null

2 个答案: