android-为RecyclerView创建可变列大小的布局管理器

概述我试图创建一个布局管理器,将其水平放置,直到遇到回收站视图的宽度为止.如果到达边缘,则应在下一行中布置子代.例如,假设在回收者视图中有4个项目-item1,item2,item3和item4.item1和item2的视图彼此相邻放置.还剩下一些空间.但是item3的视图无法适应该宽度.因此item3转到下一行.但

我试图创建一个布局管理器,将其水平放置,直到遇到回收站视图的宽度为止.如果到达边缘,则应在下一行中布置子代.
例如,假设在回收者视图中有4个项目-item1,item2,item3和item4.
item1和item2的视图彼此相邻放置.还剩下一些空间.但是item3的视图无法适应该宽度.因此item3转到下一行.但是现在剩下的差距应在项目1和项目2之间平均分配.

| <item1><item2><--gap-->||<-----item3---->        |

这应该成为

| <--item1--> <--item2-->||<-----item3---->        |

如果item4的视图适合在item3之后的空间内,则应将其放置在该位置.

| <--item1--> <--item2--> ||<-----item3----><-item4->|

这不能通过GrIDLayoutManager或StaggeredGrIDLayoutManager来实现,因为它们不考虑单个项目的宽度变化.
要编写自定义布局管理器,我有一种感觉,我应该重写布局管理器的onLayoutChildren方法.但是我有点卡住了.我不确定该怎么做.任何帮助,将不胜感激.
谢谢.

解决方法:

我遇到过类似的问题,但是使用GrIDLayout解决了这个问题.应当从一开始就创建所有视图的缺点：

<ScrollVIEw xmlns:androID="http://schemas.androID.com/apk/res/androID"                xmlns:app="http://schemas.androID.com/apk/res-auto"                androID:layout_wIDth="match_parent"                androID:layout_height="wrap_content">        <androID.support.v7.Widget.GrIDLayout            androID:ID="@+ID/bubble_grID"            androID:layout_wIDth="match_parent"            androID:layout_height="wrap_content"            androID:scrollbars="vertical"            androID:scrollbarStyle="outsIDeOverlay"            androID:layout_gravity="top|left"            app:orIEntation="vertical"            app:columnCount="@integer/grID_cells">        </androID.support.v7.Widget.GrIDLayout>    </ScrollVIEw>

这是一个适配器：

public class GrIDAdapter {    /**     * Indicates maximum filled row in current column, column is the index of arr, row is the value     * [224444555550000000]     * It equals to:     * [***********-------]     * [***********-------]     * [--*********-------]     * [--*********-------]     * [------*****-------]     * [------------------]     */    private final int[] mRowMatrix;    public GrIDAdapter(GrIDLayout grIDLayout) {        mGrIDLayout = grIDLayout;        mPlacedList = new ArrayList<>(10);        mUnplacedList = new linkedList<>();        mNumColumns = ResHelper.getInteger(R.integer.grID_cells);        mMinCells = ResHelper.getInteger(R.integer.min_cells);        mMaxCells = ResHelper.getInteger(R.integer.max_cells);        mRowMatrix = new int[mNumColumns];    }    public voID notifyDataSetChanged() {        while (mUnplacedList.size() > 0) {            final int toCol = findColWithMinRow();            final int gapSize = findGapSizeforCol(toCol);            final CustomVIEw vIEw = findAppropriate(gapSize);            if (vIEw == null) {                final int filledRow = toCol > 0                        ? (toCol + gapSize < mRowMatrix.length ? Math.min(mRowMatrix[toCol - 1], mRowMatrix[toCol + gapSize]) : mRowMatrix[toCol - 1])                        : mRowMatrix[gapSize];                for (int j = toCol, jCount = toCol + gapSize; j < jCount; j++) {                    mRowMatrix[j] = filledRow;                }            } else {                placeVIEw(vIEw, toCol, mRowMatrix[toCol]);            }        }    }    /**     * Put vIEw in certain column and row in the grIDlayout     */    private voID placeVIEw(CustomVIEw vIEw, int toCol, int toRow) {        final int grIDSize = vIEw.getGrIDSize();        final GrIDLayout.LayoutParams params = new GrIDLayout.LayoutParams();        params.wIDth = params.height = grIDSize * mCellSize;        params.columnspec = GrIDLayout.spec(toCol, grIDSize);        params.rowSpec = GrIDLayout.spec(toRow, grIDSize);        mPlacedList.add(vIEw);        mUnplacedList.remove(vIEw);        mGrIDLayout.addVIEw(vIEw, params);        final int filledRow = toRow + grIDSize;        for (int j = toCol, count = toCol + grIDSize; j < count; j++) {            mRowMap[j] = filledRow;        }    }    /**     * Find empty gap which starts from toCol     * [*********************]     * [******------*****----] here col = 6, size = 3     * [******------*****----]     * [******------*****----]     * [*****************----]     * @param toCol     * @return     */    private int findGapSizeforCol(int toCol) {        final int fromrow = mRowMatrix[toCol];        int i = toCol;        for (; i < mNumColumns; i++) {            if (fromrow != mRowMatrix[i]) {                break;            }        }        return i - toCol;    }    /**     * Find column with minimum filled row     * [*********************]     * [*****************----] here col = 17     * [******------*****----]     * [******------*****----]     * @return     */    private int findColWithMinRow() {        int minRow = Integer.MAX_VALUE, minCol = 0;        for (int i = 0, count = mRowMatrix.length; i < count; i++) {            if (minRow > mRowMatrix[i]) {                minRow = mRowMatrix[i];                minCol = i;            }        }        return minCol;    }    /**     * Find customVIEw with appropriate size for the empty gap     */    private CustomVIEw findAppropriate(int size) {        for (int j = mUnplacedList.size() - 1; j >= 0; j--) {            if (mUnplacedList.get(j).getGrIDSize() <= size) {                return mUnplacedList.get(j);            }        }        return null;    }}

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