RecyclerView單界面實現多界面效果

1.前沿

我們的產品經常會出現這樣的界面：

 

public class OffsetLinearLayoutManager extends LinearLayoutManager {    public OffsetLinearLayoutManager(Context context) {        super(context);
    }    private Map<Integer, Integer> heightMap = new HashMap<>();    @Override
    public void onLayoutCompleted(RecyclerView.State state) {        super.onLayoutCompleted(state);        int count = getChildCount();        for (int i = 0; i < count ; i++) {
            View view = getChildAt(i);
            heightMap.put(i, view.getHeight());
        }
    }    @Override
    public int computeVerticalScrollOffset(RecyclerView.State state) {        if (getChildCount() == 0) {            return 0;
        }        try {            int firstVisiablePosition = findFirstVisibleItemPosition();
            View firstVisiableView = findViewByPosition(firstVisiablePosition);            int offsetY = -(int) (firstVisiableView.getY());            for (int i = 0; i < firstVisiablePosition; i++) {
                offsetY += heightMap.get(i) == null ? 0 : heightMap.get(i);
            }            return offsetY;
        } catch (Exception e) {            return 0;
        }
    }
}