仿华为车机UI--图标从Workspace拖动到Hotseat同时保留图标在原来位置

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基于Android13 Launcher3,原生系统如果把图标从Workspace拖动到Hotseat里则Workspace就没有了，需求是执行拖拽动作后，图标同时保留在原位置。

实现效果如下：

实现思路：

1.如果在workspace中拖动，则保留原来“改变图标位置”的功能

2.如果拖拽到Hotseat，则添加到Hotseat的同时也在原来位置复制一个一样的View 

3.每次改变都要存到数据库以保存当前状态

思路非常简单，但是要找适当的位置添加适当的代码不简单。需要读懂原生代码。

分析了源代码后，发现应该参考Workspace.java的onDrop与onDropExternal代码来实现。

step1: 读懂代码后添加注释（中文为添加的注释）和添加onDropToHotseat()的调用

@Overridepublic void onDrop(final DragObject d, DragOptions options) {mDragViewVisualCenter = d.getVisualCenter(mDragViewVisualCenter);CellLayout dropTargetLayout = mDropToLayout;Log.d("drop","onDrop!");// We want the point to be mapped to the dragTarget.if (dropTargetLayout != null) {mapPointFromDropLayout(dropTargetLayout, mDragViewVisualCenter);}boolean droppedOnOriginalCell = false;boolean snappedToNewPage = false;boolean resizeOnDrop = false;Runnable onCompleteRunnable = null;if (d.dragSource != this || mDragInfo == null) {//从别的地方（AllApp等）拖到worksapce的 startfinal int[] touchXY = new int[] { (int) mDragViewVisualCenter[0],(int) mDragViewVisualCenter[1] };onDropExternal(touchXY, dropTargetLayout, d);Log.d("drop","onDropExternal!");//从别的地方（AllApp等）拖到worksapce的 end} else {//从workspace拖到workspace startfinal View cell = mDragInfo.cell;boolean droppedOnOriginalCellDuringTransition = false;if (dropTargetLayout != null && !d.cancelled) {//有地方可放且没有取消拖动 start// Move internallyboolean hasMovedLayouts = (getParentCellLayoutForView(cell) != dropTargetLayout);boolean hasMovedIntoHotseat = mLauncher.isHotseatLayout(dropTargetLayout);Log.d("drop","hasMovedIntoHotseat :"+hasMovedIntoHotseat);int container = hasMovedIntoHotseat ?LauncherSettings.Favorites.CONTAINER_HOTSEAT :LauncherSettings.Favorites.CONTAINER_DESKTOP;int screenId = (mTargetCell[0] < 0) ?mDragInfo.screenId : getIdForScreen(dropTargetLayout);int spanX = mDragInfo != null ? mDragInfo.spanX : 1;int spanY = mDragInfo != null ? mDragInfo.spanY : 1;// First we find the cell nearest to point at which the item is// dropped, without any consideration to whether there is an item there.mTargetCell = findNearestArea((int) mDragViewVisualCenter[0], (int)mDragViewVisualCenter[1], spanX, spanY, dropTargetLayout, mTargetCell);float distance = dropTargetLayout.getDistanceFromWorkspaceCellVisualCenter(mDragViewVisualCenter[0], mDragViewVisualCenter[1], mTargetCell);// If the item being dropped is a shortcut and the nearest drop// cell also contains a shortcut, then create a folder with the two shortcuts.if (createUs

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