androidandroid-linearlayoutandroid-cardviewclasscastexception
Android: CardView inside LinearLayout makes app to crash
Given the next xml:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:gravity="center"
android:orientation="vertical">
<ScrollView
android:id="@+id/llCommunityMain"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="70dp"
android:scrollbars="none">
<LinearLayout
android:id="@+id/llCommunity"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_gravity="center"
android:gravity="center">
<androidx.cardview.widget.CardView
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/cvFindCollege"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:layout_marginTop="20dp"
android:layout_margin="10dp"
app:cardCornerRadius="5dp"
app:cardElevation="10dp"
app:cardBackgroundColor="#f5f5f5"
android:theme="@style/Theme.MaterialComponents.Light">
<com.testmepracticetool.toeflsatactexamprep.component.view.TMButton
android:id="@+id/btnSuggestImprovements"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAlignment="center"
android:layout_gravity="center_horizontal"
android:theme="@style/Theme.MaterialComponents.Light"
android:background="@android:drawable/dialog_holo_light_frame"
style="@style/button_text_default"
android:text="@string/activitycommunity_button_suggestimprovements" />
</androidx.cardview.widget.CardView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:layout_marginTop="20dp">
<com.testmepracticetool.toeflsatactexamprep.component.view.TMButton
android:id="@+id/btnFindCollege"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAlignment="center"
android:layout_gravity="center_horizontal"
android:background="@android:drawable/dialog_holo_light_frame"
style="@style/button_text_default"
android:text="@string/community_button_findcollege" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/llCommunityKhan"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:layout_marginTop="20dp">
<com.testmepracticetool.toeflsatactexamprep.component.view.TMButton
android:id="@+id/btnKhan"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAlignment="center"
android:layout_gravity="center_horizontal"
android:background="@android:drawable/dialog_holo_light_frame"
style="@style/button_text_default"
android:text="@string/activitykhan_title" />
</LinearLayout>
</LinearLayout>
</ScrollView>
<include layout="@layout/footermenu_default" />
</RelativeLayout>
footer.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/llMainMenu"
android:baselineAligned="false"
android:layout_width="match_parent"
android:layout_height="70dp"
android:orientation="horizontal"
android:layout_gravity="center_vertical"
android:gravity="center_vertical"
android:layout_alignParentBottom="true"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:paddingBottom="10dp"
android:visibility="gone"
android:paddingTop="10dp"
android:background="@drawable/layout_border_top">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight=".20"
android:gravity="center_horizontal">
<ImageView
android:contentDescription="@string/pref_category_animations"
android:id="@+id/btnTests"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="3dp"
android:paddingStart="3dp"
android:paddingRight="3dp"
android:paddingEnd="3dp"
android:src="@drawable/button_main_tests" />
<TextView
android:id="@+id/tvMainMenuTests"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:paddingTop="5dp"
android:text="@string/mainmenu_button_tests"
android:textColor="#a8a8a8"
android:textSize="11sp" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight=".20"
android:gravity="center_horizontal">
<ImageView
android:contentDescription="@string/pref_category_animations"
android:id="@+id/btnRecords"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="3dp"
android:paddingStart="3dp"
android:paddingRight="3dp"
android:paddingEnd="3dp"
android:src="@drawable/button_main_records" />
<TextView
android:id="@+id/tvMainMenuRecords"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:paddingTop="5dp"
android:text="@string/mainmenu_button_records"
android:textColor="#a8a8a8"
android:textSize="11sp" />
</LinearLayout>
<LinearLayout
android:id="@+id/llMainMenuImportExport"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight=".20"
android:gravity="center_horizontal"
android:visibility="gone">
<ImageView
android:contentDescription="@string/pref_category_animations"
android:id="@+id/btnImportExport"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="3dp"
android:paddingStart="3dp"
android:paddingRight="3dp"
android:paddingEnd="3dp"
android:visibility="gone"
android:src="@drawable/button_records_importexport" />
<TextView
android:id="@+id/tvMainMenuImportExport"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="5dp"
android:text="@string/mainmenu_button_importexport"
android:textColor="#a8a8a8"
android:textSize="11sp"
android:visibility="gone"/>
</LinearLayout>
<LinearLayout
android:id="@+id/llMainMenuProgress"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight=".20"
android:gravity="center_horizontal"
android:visibility="gone">
<ImageView
android:contentDescription="@string/pref_category_animations"
android:id="@+id/btnProgress"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="3dp"
android:paddingStart="3dp"
android:paddingRight="3dp"
android:paddingEnd="3dp"
android:visibility="gone"
android:src="@drawable/button_records_progress" />
<TextView
android:id="@+id/tvMainMenuProgress"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:paddingTop="5dp"
android:text="@string/mainmenu_button_progress"
android:textColor="#a8a8a8"
android:textSize="11sp"
android:visibility="gone"/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight=".20"
android:gravity="center_horizontal">
<ImageView
android:contentDescription="@string/pref_category_animations"
android:id="@+id/btnCommunity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="3dp"
android:paddingStart="3dp"
android:paddingRight="3dp"
android:paddingEnd="3dp"
android:src="@drawable/button_main_community" />
<TextView
android:id="@+id/tvMainMenuCommunity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:paddingTop="5dp"
android:text="@string/mainmenu_button_community"
android:textColor="#a8a8a8"
android:textSize="11sp" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight=".20"
android:gravity="center_horizontal">
<ImageView
android:contentDescription="@string/pref_category_animations"
android:id="@+id/btnUser"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="3dp"
android:paddingStart="3dp"
android:paddingRight="3dp"
android:paddingEnd="3dp"
android:src="@drawable/button_main_user" />
<TextView
android:id="@+id/tvMainMenuUser"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:paddingTop="5dp"
android:text="@string/mainmenu_button_User"
android:textColor="#a8a8a8"
android:textSize="11sp" />
</LinearLayout>
</LinearLayout>
My app crashes as soon as it tries to set the layout with the following exception
android.widget.TableRow$LayoutParams cannot be cast to android.widget.FrameLayout$LayoutParams
What may be wrong?
Solution
I checked your Layout with the stuff I have from you. I don't have the footer (not tested) and Button implementation. I replaced your Buttons with the default onces. What I changed; You shouldn't use a ScrollView for such amount of Views and it should be on top as a rootView. I replaced your ScrollView with a NestedScrollView and swapped the places with the root RelativeLayout (changed the parameters also):
<?xml version="1.0" encoding="utf-8"?>
<androidx.core.widget.NestedScrollView
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:gravity="center"
android:orientation="vertical"
android:scrollbars="none">
<RelativeLayout
android:id="@+id/llCommunityMain"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:gravity="center"
android:paddingBottom="70dp">
<LinearLayout
android:id="@+id/llCommunity"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:orientation="vertical">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<androidx.cardview.widget.CardView
android:id="@+id/cvFindCollege"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:layout_marginTop="20dp"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:theme="@style/Theme.MaterialComponents.Light"
app:cardBackgroundColor="#f5f5f5"
app:cardCornerRadius="5dp"
app:cardElevation="10dp">
<Button
android:id="@+id/btnSuggestImprovements"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:background="@android:drawable/dialog_holo_light_frame"
android:text="Button 1"
android:textAlignment="center"
android:theme="@style/Theme.MaterialComponents.Light" />
</androidx.cardview.widget.CardView>
</RelativeLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:paddingLeft="15dp"
android:paddingRight="15dp">
<Button
android:id="@+id/btnFindCollege"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:background="@android:drawable/dialog_holo_light_frame"
android:text="Button 2"
android:textAlignment="center" />
</LinearLayout>
<LinearLayout
android:id="@+id/llCommunityKhan"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:paddingLeft="15dp"
android:paddingRight="15dp">
<Button
android:id="@+id/btnKhan"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:background="@android:drawable/dialog_holo_light_frame"
android:text="Button 3"
android:textAlignment="center" />
</LinearLayout>
</LinearLayout>
</RelativeLayout>
</androidx.core.widget.NestedScrollView>
Yet, if I run the app everything works fine. My guess is that the NestedScrollView served as a rootView solved the problem. If not there are only 2 things you need to check. Your Button implementation or the footer. Cheers :)
Result:
