仿es文件浏览器的拖拽功能

仿es文件浏览器的拖拽功能

github的地址:https://github.com/originzyf/DragFileMessage

gif图录得不好 第一次搞

这段代码是recycleview内部拖拽的主要方法

 @Override
    public boolean onDrag(View v, DragEvent event) {
        if (!(event.getLocalState() instanceof DragState)) {
            return false;
        }
        final DragState dragState = (DragState) event.getLocalState();
        switch (event.getAction()) {
            case DragEvent.ACTION_DRAG_STARTED:
                dragListener.notifyItemChange(dragListener.getPosition(dragState.getItem()), dragState.getItemId());
                break;
            case DragEvent.ACTION_DRAG_ENTERED:
                break;
            case DragEvent.ACTION_DRAG_LOCATION:
                if (fromPosition == -1) {
                    //获取源文件的position
                    fromPosition = dragListener.getPosition(dragState.getItem());
                }
                //更新item背景
                dragListener.setItemColor(fromPosition, getToPosition(event));
                break;
            case DragEvent.ACTION_DRAG_EXITED:
                dragListener.setAllColor();
                break;
            case DragEvent.ACTION_DRAG_ENDED:
                //重置一些参数
                dragListener.notifyItemChange(dragListener.getPosition(dragState.getItem()), DragListener.NO_ID);
                fromPosition = -1;
                nextMoveTouchPoint.set(MIN_VALUE, MIN_VALUE);
                break;
            case DragEvent.ACTION_DROP:
                //删除源文件的item 并移动文件
                dragListener.onDragEnd(fromPosition, getToPosition(event));
                textListener.setTextVisibility(View.GONE, R.color.white);
                break;
        }
        return true;
    }

这段代码是拖拽目标超出recycleview范围的时候的监听

container.setOnDragListener(new View.OnDragListener() {
            @Override
            public boolean onDrag(View view, DragEvent dragEvent) {
                //获取view 的坐标
                int maxWidth = remove.getWidth();
                int maxHight = remove.getHeight();

                dragX = dragEvent.getX();
                dragY = dragEvent.getY();
                //选中了删除 改名等功能
                if ((dragX - x) < maxWidth && (dragY - y) > 0 && (dragY - y) < maxHight && dragX > 0) {
                    removeCount = 0;
                    remove.setBackgroundResource(R.color.blue);
                } else {
                    remove.setBackgroundResource(R.color.gray);
                    removeCount = -1;
                }
                if ((width - dragX) < maxWidth && (width - dragX) > 0 && dragY < 120) {
                    renameCount = 0;
                    rename.setBackgroundResource(R.color.blue);
                } else {
                    rename.setBackgroundResource(R.color.gray);
                    renameCount = -1;
                }
                if (dragY > 1000) {
                    View child1 = rv.findChildViewUnder(dragX, hight - dragY);
                    if (child1 != null) {
                        int toPosition = rv.getChildViewHolder(child1).getAdapterPosition();
                        if (lastPosition == -1)
                            lastPosition = toPosition;
                        else {
                            if (lastPosition != toPosition) {
                                setChildBackground(lastPosition, Color.WHITE, true);
                                lastPosition = toPosition;
                            }
                        }
                        setChildBackground(toPosition, Color.BLUE, false);
                        copyCount = 0;
                    }
                } else {
                    copyCount = -1;
                    if (lastPosition != -1)
                        setChildBackground(lastPosition, Color.WHITE, true);
                }
                if (dragEvent.getAction() == DragEvent.ACTION_DROP) {
                    if (onLongPosition == -1)
                        return true;
                    String absolutePath = contentAdapter.getData().get(onLongPosition).getFile().getAbsolutePath();
                    if (removeCount == 0)
                        showDeleteDialog(mActivity, absolutePath, onLongPosition, contentAdapter);
                    else if (renameCount == 0)
                        showRenameDialog(mActivity, absolutePath, contentAdapter, contentList);
                    else if (copyCount == 0) {
                        if (lastPosition == -1)
                            return true;
                        AlertDialog.Builder inputDialog = new AlertDialog.Builder(mActivity);
                        inputDialog.setTitle("是否复制").setPositiveButton("确定",
                                new DialogInterface.OnClickListener() {
                                    @Override
                                    public void onClick(DialogInterface dialog, int which) {
                                        File file1 = arrayList.get(lastPosition).getFile();
                                        entity entity = contentList.get(onLongPosition);
                                        File file2 = new File(file1.getAbsolutePath() + "/" + entity.getFile().getName());
                                        if (!file2.exists())
                                            file2.mkdirs();
                                        if (FileUtils.moveDirectory(entity.getFile().getAbsolutePath(), file2.getAbsolutePath())) {
                                            mPresenter.getPathDate(contentList, SDCarePath + path + "/", false);
                                            contentAdapter.notifyDataSetChanged();
                                            showToast("移动成功");
                                        } else
                                            showToast("移动失败");
                                        lastPosition = -1;
                                    }
                                }).show();
                    }
                    setTextVisibility(View.GONE, R.color.white);
                }
                return true;
            }
        });

实现思路是给最外层的布局添加监听 然后根据手指的选中坐标换算相对于最外层布局的xy坐标

根据xy轴获取recycleview 的item的holder

 View child = rv.getLayoutManager().findViewByPosition(pos);
        mData.get(pos).b = isColor;
        if (null != child) {
            BaseViewHolder holder = (BaseViewHolder) rv.getChildViewHolder(child);
            holder.setBackgroundColor(R.id.line, color);
            notifyItemChanged(pos);
        }