我正在尝试为我的应用程序的各个组件添加高程,以使其具有更多材料外观。在给我带来问题的布局正下方,我有一个 LinearLayout,它在其兄弟上投射阴影,但这个元素不会显示阴影,我不知道为什么。
<LinearLayout
android:id="@+id/input_control_block"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:color="@color/white"
android:elevation="8dp">
<Button
android:id="@+id/inputModeSelector"
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="3"
android:background="@color/cyan"
android:clickable="true"
android:drawableRight="@drawable/ic_assignment_white_18dp"
android:gravity="center_vertical|left"
android:padding="16dp"
android:text=" Text"
android:textColor="@color/white" />
<ImageButton
android:id="@+id/addNoteButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="2"
android:background="@color/cyan"
android:clickable="true"
android:gravity="center"
android:padding="8dp"
android:src="@drawable/ic_add_circle_outline_white_18dp" />
<Button
android:id="@+id/alarmEnableButton"
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="3"
android:background="@color/cyan"
android:clickable="true"
android:drawableLeft="@drawable/ic_notifications_off_white_18dp"
android:gravity="center_vertical|right"
android:padding="16dp"
android:text="None"
android:textColor="#ffffff" />
</LinearLayout>
<LinearLayout
android:id="@+id/edit_text_block"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:animateLayoutChanges="true"
android:background="@color/white"
android:orientation="vertical"
android:padding="16dp">
//sibling element shadow should be cast on