Recyclerview设置间距

Posted 2022-01-02 hyhy904

首先自定义一个RecyclerViewDivider 继承 RecyclerView.ItemDecoration，实现自定义。

public class RecyclerViewDivider extends RecyclerView.ItemDecoration
private Paint mPaint;
private Drawable mDivider;
private int mDividerSize = 2;//分割线高度，默认为1px
private int mOffsetStart = 0;
private int mOffsetEnd = 0;
private int mOrientation;//列表的方向：LinearLayoutManager.VERTICAL或LinearLayoutManager.HORIZONTAL
private static final int[] ATTRS = new int[]android.R.attr.listDivider;

/**
* 默认分割线：高度为2px，颜色为灰色
*
* @param context
* @param orientation 列表方向
*/
private RecyclerViewDivider(Context context, int orientation)
if (orientation != LinearLayoutManager.VERTICAL && orientation != LinearLayoutManager.HORIZONTAL)
throw new IllegalArgumentException("请输入正确的参数！");

mOrientation = orientation;

final TypedArray a = context.obtainStyledAttributes(ATTRS);
mDivider = a.getDrawable(0);
a.recycle();

/**
* 自定义分割线
*
* @param context
* @param orientation 列表方向
* @param drawableId 分割线图片
*/
public RecyclerViewDivider(Context context, int orientation, int drawableId)
this(context, orientation);
mDivider = ContextCompat.getDrawable(context, drawableId);
mDividerSize = mDivider.getIntrinsicHeight();

/**
* 自定义分割线
*
* @param context
* @param orientation 列表方向
* @param dividerSize 分割线高度
* @param dividerColor 分割线颜色
*/
public RecyclerViewDivider(Context context, int orientation, int dividerSize, @ColorRes int dividerColor)
this(context, orientation);
mDividerSize = dividerSize;
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);

mPaint.setColor(context.getResources().getColor(dividerColor));
mPaint.setStyle(Paint.Style.FILL);

/**
* 自定义分割线
*
* @param context context
* @param orientation 列表方向
* @param dividerHeight 分割线高度
* @param dividerColor 分割线颜色
* @param offsetStart 起始偏移量
* @param offsetEnd 结束偏移量
*/
public RecyclerViewDivider(Context context, int orientation, int dividerHeight, @ColorRes int dividerColor, int offsetStart, int offsetEnd)
this(context, orientation);
mDividerSize = dividerHeight;
mOffsetStart = Util.dp2px(context, offsetStart);
mOffsetEnd = Util.dp2px(context, offsetEnd);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
if (dividerColor == 0)
dividerColor = R.color.lightGray;

mPaint.setColor(context.getResources().getColor(dividerColor));
mPaint.setStyle(Paint.Style.FILL);

//重写此方法，防止设置的波纹背景把分隔线覆盖掉。
@Override
public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state)
RecyclerView.ViewHolder childViewHolder = parent.getChildViewHolder(view);
if (childViewHolder.getItemViewType() != 0)
outRect.set(0, 0, 0, 0);
return;

if (mOrientation == LinearLayoutManager.HORIZONTAL)
outRect.set(0, 0, 0, mDividerSize);
else
outRect.set(0, 0, mDividerSize, 0);

//绘制分割线
@Override
public void onDraw(@NonNull Canvas c, @NonNull RecyclerView parent, @NonNull RecyclerView.State state)
if (mOrientation == LinearLayoutManager.VERTICAL)
drawVertical(c, parent);
else
drawHorizontal(c, parent);

//绘制横向 item 分割线
private void drawHorizontal(Canvas canvas, RecyclerView parent)
final int left = parent.getPaddingLeft() + mOffsetStart;
final int right = parent.getMeasuredWidth() - (parent.getPaddingRight() + mOffsetEnd);
final int childSize = parent.getChildCount();
for (int i = 0; i < childSize - 1; i++)
final View child = parent.getChildAt(http://www.my516.com);

RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams();
final int top = child.getBottom() + layoutParams.bottomMargin;
final int bottom = top + mDividerSize;
if (mDivider != null)
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(canvas);

if (mPaint != null)
canvas.drawRect(left, top, right, bottom, mPaint);

//绘制纵向 item 分割线
private void drawVertical(Canvas canvas, RecyclerView parent)
final int top = parent.getPaddingTop() + mDividerSize;
final int bottom = parent.getMeasuredHeight() - parent.getPaddingBottom() + mDividerSize;
final int childSize = parent.getChildCount();
for (int i = 0; i < childSize; i++)
final View child = parent.getChildAt(i);
RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams();
final int left = child.getRight() + layoutParams.rightMargin;
final int right = left + mDividerSize;
if (mDivider != null)
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(canvas);

if (mPaint != null)
canvas.drawRect(left, top, right, bottom, mPaint);




1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
举个例子：

rcyDetailsDelegation.addItemDecoration(new RecyclerViewDivider(getContext(), LinearLayoutManager.HORIZONTAL,
5, R.color.white, 8, 8));
1
2
其中提供一个 RecyclerViewDivider：
---------------------