在新版本中需求变更导致布局需要变化，RecyclerView外需要一层ScrollView来处理滑动。发布前夕发现在API 23 & 24上RecyclerView显示不完整。

  光速冷静下来，马上去stackoverflow翻了一下，有人说ScrollView加上 android:fillViewport="true" ，但是我加上并没有解决问题。后来在RecyclerView外面加了一层RelativeLayout，问题解决。如果你在API 23 & 24上也遇到这个问题，可以参考一下。

<android.support.v4.widget.NestedScrollViewandroid:layout_width="match_parent"android:layout_height="match_parent"><!-- DEV NOTE: Outer wrapper relative layout is added intentionally to address issuethat only happens on Marshmallow & Nougat devices (API 23 & 24).On marshmallow API 23, the "RecyclerView" `layout_height="wrap_content"` does NOToccupy the height of all the elements added to it via adapter. The result is cut outitems that is outside of device viewport when it loads initially.Wrapping "RecyclerView" with "RelativeLayout" fixes the issue on Marshmallow devices.--><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"><com.jcodecraeer.xrecyclerview.XRecyclerViewandroid:id="@+id/rv_fragment_find_tips_list"android:layout_width="match_parent"android:layout_height="wrap_content" /></RelativeLayout></android.support.v4.widget.NestedScrollView>

1. import android.content.Context;
2. import android.support.v7.widget.LinearLayoutManager;
3. import android.support.v7.widget.RecyclerView;
4. import android.util.Log;
5. import android.view.View;
6. import android.view.ViewGroup;
7. /**
8. * Created by k on 2016/8/13.
9. */
10. public class FullyLinearLayoutManager extends LinearLayoutManager {
11. private static final String TAG = FullyLinearLayoutManager.class.getSimpleName();
12. public FullyLinearLayoutManager(Context context) {
13. super(context);
14. }
15. public FullyLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {
16. super(context, orientation, reverseLayout);
17. }
18. private int[] mMeasuredDimension = new int[2];
19. @Override
20. public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state,
21. int widthSpec, int heightSpec) {
22. final int widthMode = View.MeasureSpec.getMode(widthSpec);
23. final int heightMode = View.MeasureSpec.getMode(heightSpec);
24. final int widthSize = View.MeasureSpec.getSize(widthSpec);
25. final int heightSize = View.MeasureSpec.getSize(heightSpec);
26. Log.i(TAG, "onMeasure called. \nwidthMode " + widthMode
27. + " \nheightMode " + heightSpec
28. + " \nwidthSize " + widthSize
29. + " \nheightSize " + heightSize
30. + " \ngetItemCount() " + getItemCount());
31. int width = 0;
32. int height = 0;
33. for (int i = 0; i < getItemCount(); i++) {
34. measureScrapChild(recycler, i,
35. View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
36. View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
37. mMeasuredDimension);
38. if (getOrientation() == HORIZONTAL) {
39. width = width + mMeasuredDimension[0];
40. if (i == 0) {
41. height = mMeasuredDimension[1];
42. }
43. } else {
44. height = height + mMeasuredDimension[1];
45. if (i == 0) {
46. width = mMeasuredDimension[0];
47. }
48. }
49. }
50. switch (widthMode) {
51. case View.MeasureSpec.EXACTLY:
52. width = widthSize;
53. case View.MeasureSpec.AT_MOST:
54. case View.MeasureSpec.UNSPECIFIED:
55. }
56. switch (heightMode) {
57. case View.MeasureSpec.EXACTLY:
58. height = heightSize;
59. case View.MeasureSpec.AT_MOST:
60. case View.MeasureSpec.UNSPECIFIED:
61. }
62. setMeasuredDimension(width, height);
63. }
64. private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,
65. int heightSpec, int[] measuredDimension) {
66. try {
67. View view = recycler.getViewForPosition(0);//fix 动态添加时报IndexOutOfBoundsException
68. if (view != null) {
69. RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();
70. int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec,
71. getPaddingLeft() + getPaddingRight(), p.width);
72. int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec,
73. getPaddingTop() + getPaddingBottom(), p.height);
74. view.measure(childWidthSpec, childHeightSpec);
75. measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin;
76. measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin;
77. recycler.recycleView(view);
78. }
79. } catch (Exception e) {
80. e.printStackTrace();
81. } finally {
82. }
83. }
84. }

1. FullyLinearLayoutManager linearLayoutManager = new FullyLinearLayoutManager(this);
2. recyclerView.setNestedScrollingEnabled(false);
3. //设置布局管理器
4. recyclerView.setLayoutManager(linearLayoutManager);