Android 8.1 桌面上的不能拖动卸载/删除，只能在后台系统—应用那里进行卸载

— a/packages/apps/Launcher3/res/layout/drop_target_bar_horz.xml
+++ b/packages/apps/Launcher3/res/layout/drop_target_bar_horz.xml
@@ -37,6 +37,7 @@
android:layout_height=“match_parent”
android:layout_gravity=“center”
android:gravity=“center”

•                   android:visibility="gone"
         android:id="@+id/delete_target_text"
         style="@style/DropTargetButton"
         android:text="@string/remove_drop_target_label" />
  

@@ -72,6 +73,7 @@
android:layout_width=“wrap_content”
android:layout_height=“match_parent”
android:layout_gravity=“center”

•                   android:visibility="gone"
         android:gravity="center"
         android:id="@+id/uninstall_target_text"
         style="@style/DropTargetButton"