相关疑难解决方法(0)

How can I force a MaterialButtonToggleGroup to act like a RadioGroup as in having at least one selected item always? Setting setSingleSelection(true) also adds the possibility to have nothing selected if you click twice on a Button in the group.

Here is my code:

<com.google.android.material.button.MaterialButtonToggleGroup
            android:id="@id/BottomSheetDialog_fromFragmentBottomSheetSort_Sort_ToggleButtonGroup"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:singleSelection="true"
            app:checkedButton="@+id/BottomSheetDialog_fromFragmentBottomSheetSort_Sort_ToggleButtonGroup_Ascending">

        <com.google.android.material.button.MaterialButton
                android:id="@id/BottomSheetDialog_fromFragmentBottomSheetSort_Sort_ToggleButtonGroup_Ascending"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/Fragment_BottomSheetDialog_Sort_ToggleButton_Ascending"
                app:backgroundTint="@color/custom_button_background_states"
                style="@style/Widget.MaterialComponents.Button.OutlinedButton"/>

        <com.google.android.material.button.MaterialButton
                android:id="@id/BottomSheetDialog_fromFragmentBottomSheetSort_Sort_ToggleButtonGroup_Descending"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/Fragment_BottomSheetDialog_Sort_ToggleButton_Descending"
                app:backgroundTint="@color/custom_button_background_states"
                style="@style/Widget.MaterialComponents.Button.OutlinedButton"/>
    </com.google.android.material.button.MaterialButtonToggleGroup>

As you can see, even while using app:singleSelection="true" if i click on an already checked …