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

news2024/11/22 21:40:34

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:

99fdd6f2bacc40e586ebec33272195eb.gif

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

@Override
    public 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 start
            final 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 start
            final 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 internally
                boolean 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 (createUserFolderIfNecessary(cell, container,
                        dropTargetLayout, mTargetCell, distance, false, d)
                        || addToExistingFolderIfNecessary(cell, dropTargetLayout, mTargetCell,
                                distance, d, false)) {
                    mLauncher.getStateManager().goToState(NORMAL, SPRING_LOADED_EXIT_DELAY);
                    return;
                }

                // Aside from the special case where we're dropping a shortcut onto a shortcut,
                // we need to find the nearest cell location that is vacant
                ItemInfo item = d.dragInfo;
                int minSpanX = item.spanX;
                int minSpanY = item.spanY;
                if (item.minSpanX > 0 && item.minSpanY > 0) {
                    minSpanX = item.minSpanX;
                    minSpanY = item.minSpanY;
                }

                droppedOnOriginalCell = item.screenId == screenId && item.container == container
                        && item.cellX == mTargetCell[0] && item.cellY == mTargetCell[1];
                droppedOnOriginalCellDuringTransition = droppedOnOriginalCell && mIsSwitchingState;

                // When quickly moving an item, a user may accidentally rearrange their
                // workspace. So instead we move the icon back safely to its original position.
                boolean returnToOriginalCellToPreventShuffling = !isFinishedSwitchingState()
                        && !droppedOnOriginalCellDuringTransition && !dropTargetLayout
                        .isRegionVacant(mTargetCell[0], mTargetCell[1], spanX, spanY);
                int[] resultSpan = new int[2];
                if (returnToOriginalCellToPreventShuffling) {
                    mTargetCell[0] = mTargetCell[1] = -1;
                } else {
                    //让目的地Layout重新布局一下顺序,腾出drop的位置
                    mTargetCell = dropTargetLayout.performReorder((int) mDragViewVisualCenter[0],
                            (int) mDragViewVisualCenter[1], minSpanX, minSpanY, spanX, spanY, cell,
                            mTargetCell, resultSpan, CellLayout.MODE_ON_DROP);
                }

                boolean foundCell = mTargetCell[0] >= 0 && mTargetCell[1] >= 0;

                // if the widget resizes on drop
                if (foundCell && (cell instanceof AppWidgetHostView) &&
                        (resultSpan[0] != item.spanX || resultSpan[1] != item.spanY)) {
                    resizeOnDrop = true;
                    item.spanX = resultSpan[0];
                    item.spanY = resultSpan[1];
                    AppWidgetHostView awhv = (AppWidgetHostView) cell;
                    WidgetSizes.updateWidgetSizeRanges(awhv, mLauncher, resultSpan[0],
                            resultSpan[1]);
                }

                if (foundCell) {//目的地有空出位置 start
                    int targetScreenIndex = getPageIndexForScreenId(screenId);
                    int snapScreen = getLeftmostVisiblePageForIndex(targetScreenIndex);
                    // On large screen devices two pages can be shown at the same time, and snap
                    // isn't needed if the source and target screens appear at the same time
                    if (snapScreen != mCurrentPage && !hasMovedIntoHotseat) {
                        snapToPage(snapScreen);
                        snappedToNewPage = true;
                    }
                    final ItemInfo info = (ItemInfo) cell.getTag();
                    /*这一段实现把cell从原来的父View中remove掉,添加到目的layout里去 start*/
                    if (hasMovedLayouts) {
                        // Reparent the view  这段非常关键,重新安排父View start
                        Log.d("drop","drop to different layout!!");//表示放在了不同的layout里

                        CellLayout parentCell = getParentCellLayoutForView(cell);
                        if (parentCell != null) {
                            parentCell.removeView(cell);//如果注释这句,就会报错,说明view不能有两个parent
                        } else if (mDragInfo.cell instanceof LauncherAppWidgetHostView) {
                            d.dragView.detachContentView(/* reattachToPreviousParent= */ false);
                        } else if (FeatureFlags.IS_STUDIO_BUILD) {
                            throw new NullPointerException("mDragInfo.cell has null parent");
                        }

                        addInScreen(cell, container, screenId, mTargetCell[0], mTargetCell[1],
                                info.spanX, info.spanY);
                        //假如我们在此调用getParentCellLayoutForView(cell);得到的parentCell就是目的layout了
                        // Reparent the view  这段非常关键,重新安排父View end
                        //added by Kevin.Ye for create keep dragObject when dropped to Hotseat
                        if(hasMovedIntoHotseat)
                            onDropToHotseat(d);
                        //end
                    }
                    /*这一段实现把cell从原来的父View中remove掉,添加到目的layout里去 end*/
                    // update the item's position after drop
                    /*把目的地位置,作为这个cell的位置 start*/
                    CellLayout.LayoutParams lp = (CellLayout.LayoutParams) cell.getLayoutParams();
                    lp.cellX = lp.tmpCellX = mTargetCell[0];
                    lp.cellY = lp.tmpCellY = mTargetCell[1];
                    lp.cellHSpan = item.spanX;
                    lp.cellVSpan = item.spanY;
                    lp.isLockedToGrid = true;
                    /*把目的地位置,作为这个cell的位置 end*/
                    if (container != LauncherSettings.Favorites.CONTAINER_HOTSEAT &&
                            cell instanceof LauncherAppWidgetHostView) {//这段处理的是widget
                        final CellLayout cellLayout = dropTargetLayout;
                        // We post this call so that the widget has a chance to be placed
                        // in its final location

                        final LauncherAppWidgetHostView hostView = (LauncherAppWidgetHostView) cell;
                        AppWidgetProviderInfo pInfo = hostView.getAppWidgetInfo();
                        if (pInfo != null && pInfo.resizeMode != AppWidgetProviderInfo.RESIZE_NONE
                                && !options.isAccessibleDrag) {
                            onCompleteRunnable = () -> {
                                if (!isPageInTransition()) {
                                    AppWidgetResizeFrame.showForWidget(hostView, cellLayout);
                                }
                            };
                        }
                    }
                    //更新到数据库里去
                    mLauncher.getModelWriter().modifyItemInDatabase(info, container, screenId,
                            lp.cellX, lp.cellY, item.spanX, item.spanY);


                } else {//没有找到位置drop start

                    if (!returnToOriginalCellToPreventShuffling) {
                        onNoCellFound(dropTargetLayout, d.dragInfo, d.logInstanceId);
                    }
                    if (mDragInfo.cell instanceof LauncherAppWidgetHostView) {
                        d.dragView.detachContentView(/* reattachToPreviousParent= */ true);
                    }

                    // If we can't find a drop location, we return the item to its original position
                    CellLayout.LayoutParams lp = (CellLayout.LayoutParams) cell.getLayoutParams();
                    mTargetCell[0] = lp.cellX;
                    mTargetCell[1] = lp.cellY;
                    CellLayout layout = (CellLayout) cell.getParent().getParent();
                    layout.markCellsAsOccupiedForView(cell);
                }//没有找到位置 end
            } else {//处理取消drag start
                // When drag is cancelled, reattach content view back to its original parent.
                if (mDragInfo.cell instanceof LauncherAppWidgetHostView) {
                    d.dragView.detachContentView(/* reattachToPreviousParent= */ true);
                }
                //处理取消drag end
            }

            final CellLayout parent = (CellLayout) cell.getParent().getParent();
            if (d.dragView.hasDrawn()) {//拖动View已经绘图 stat
                if (droppedOnOriginalCellDuringTransition) {//过渡的过程中拖到原来的位置 start
                    // Animate the item to its original position, while simultaneously exiting
                    // spring-loaded mode so the page meets the icon where it was picked up.
                    final RunnableList callbackList = new RunnableList();
                    final Runnable onCompleteCallback = onCompleteRunnable;
                    mLauncher.getDragController().animateDragViewToOriginalPosition(
                            /* onComplete= */ callbackList::executeAllAndDestroy, cell,
                            SPRING_LOADED.getTransitionDuration(mLauncher, true /* isToState */));
                    mLauncher.getStateManager().goToState(NORMAL, /* delay= */ 0,
                            onCompleteCallback == null
                                    ? null
                                    : forSuccessCallback(
                                            () -> callbackList.add(onCompleteCallback)));
                    mLauncher.getDropTargetBar().onDragEnd();
                    parent.onDropChild(cell);
                    return;
                }//过渡的过程中拖到原来的位置 end
                final ItemInfo info = (ItemInfo) cell.getTag();
                boolean isWidget = info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET
                        || info.itemType == LauncherSettings.Favorites.ITEM_TYPE_CUSTOM_APPWIDGET;
                if (isWidget) {//桌面小组件drop到新位置
                    int animationType = resizeOnDrop ? ANIMATE_INTO_POSITION_AND_RESIZE :
                            ANIMATE_INTO_POSITION_AND_DISAPPEAR;
                    animateWidgetDrop(info, parent, d.dragView, null, animationType, cell, false);
                } else {//图标动画移动到新位置,但如果没有drop到目的地,则会回到原来的位置
                    int duration = snappedToNewPage ? ADJACENT_SCREEN_DROP_DURATION : -1;
                    mLauncher.getDragLayer().animateViewIntoPosition(d.dragView, cell, duration,
                            this);
                }
            } else {
                d.deferDragViewCleanupPostAnimation = false;
                cell.setVisibility(VISIBLE);
            }
            parent.onDropChild(cell);

            mLauncher.getStateManager().goToState(NORMAL, SPRING_LOADED_EXIT_DELAY,
                    onCompleteRunnable == null ? null : forSuccessCallback(onCompleteRunnable));
            mStatsLogManager.logger().withItemInfo(d.dragInfo).withInstanceId(d.logInstanceId)
                    .log(LauncherEvent.LAUNCHER_ITEM_DROP_COMPLETED);
        }

        if (d.stateAnnouncer != null && !droppedOnOriginalCell) {
            d.stateAnnouncer.completeAction(R.string.item_moved);
        }
    }

step2:同样在Workspace.java中添加增加的接口 onDropToHotseat(DragObject d)

 

/*
    * Added by Kevin.Ye
    * when a shortcut was dropped to Hotseat,we create a new one in original position
    * */
    private void onDropToHotseat(DragObject d){
        ItemInfo info = d.dragInfo;
        WorkspaceItemInfo newItemInfo = null;
        View view;
        switch (info.itemType) {
            case ITEM_TYPE_APPLICATION:
            case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:
            case LauncherSettings.Favorites.ITEM_TYPE_DEEP_SHORTCUT:
            case LauncherSettings.Favorites.ITEM_TYPE_SEARCH_ACTION:
                if (info instanceof WorkspaceItemFactory) {
                    // Came from all apps -- make a copy
                    newItemInfo = ((WorkspaceItemFactory) info).makeWorkspaceItem(mLauncher);
                    //d.dragInfo = info;
                }
                if (info instanceof WorkspaceItemInfo) {
                    // Came from all apps prediction row -- make a copy
                    newItemInfo = new WorkspaceItemInfo((WorkspaceItemInfo) info);
                    //d.dragInfo = info;
                }
                view = mLauncher.createShortcut((WorkspaceItemInfo) info);
                break;
            case LauncherSettings.Favorites.ITEM_TYPE_FOLDER:
                view = FolderIcon.inflateFolderAndIcon(R.layout.folder_icon, mLauncher, (ViewGroup) getChildAt(0),
                        (FolderInfo) info);
                break;
            default:
                throw new IllegalStateException("Unknown item type: " + info.itemType);
        }

        //final ContentResolver cr = getContext().getContentResolver();
        //newItemInfo.id = LauncherSettings.Settings.call(cr, LauncherSettings.Settings.METHOD_NEW_ITEM_ID).getInt(LauncherSettings.Settings.EXTRA_VALUE);
        if(newItemInfo == null)
            return;
        newItemInfo.id = ItemInfo.NO_ID;//this is very important,otherwise it won't be add new shortcut in database marked by Kevin.Ye
        Log.d("drop","info.id:"+info.id+" newItemInfo.id:"+newItemInfo.id);
        // Add the item to DB before adding to screen ensures that the container and other// values of the info is properly updated.
        Log.d("drop","new shortcut container:"+newItemInfo.container+" screenId:"+newItemInfo.screenId+" cellX:"+newItemInfo.cellX
                +" cellY:"+newItemInfo.cellY);
        //info.id = ItemInfo.NO_ID;//it is very important as we need to add new one to database not move
        mLauncher.getModelWriter().addOrMoveItemInDatabase(newItemInfo, newItemInfo.container, newItemInfo.screenId, newItemInfo.cellX, newItemInfo.cellY);
        addInScreen(view, newItemInfo.container, newItemInfo.screenId, newItemInfo.cellX, newItemInfo.cellY,newItemInfo.spanX, newItemInfo.spanY);
    }

 

 

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