14 | * 透明间隔的网格Decoration,可以通过构造方法来设置相应位置的间隔 15 | * {@link #GridSpaceDecoration(int, int, int, int, int, int) 16 | *
17 | *
18 | * 可以通过继承该类来实现一些特殊的分割线效果 19 | * 由于此类已经写好{@link #getItemOffsets(Rect, View, RecyclerView, RecyclerView.State)}方法，所以只需 20 | * 继承构造方法并重写{@link #onDraw(Canvas, RecyclerView, RecyclerView.State)}即可实现特殊的分割线效果 21 | *
22 | * 该Decoration目前只支持{@link GridLayoutManager } 23 | */ 24 | public class GridSpaceDecoration extends RecyclerView.ItemDecoration { 25 | 26 | private int mHorizontal, mVertical, mLeft, mRight, mTop, mBottom; 27 | private boolean isFirst = true; 28 | protected GridLayoutManager mManager; 29 | protected int mSpanCount; 30 | protected int mChildCount; 31 | 32 | /** 33 | * @see #GridSpaceDecoration(int, int, int, int) 34 | */ 35 | public GridSpaceDecoration(int horizontal, int vertical) { 36 | this(horizontal, vertical, 0, 0); 37 | } 38 | 39 | /** 40 | * @see #GridSpaceDecoration(int, int, int, int, int, int) 41 | */ 42 | public GridSpaceDecoration(int horizontal, int vertical, int left, int right) { 43 | this(horizontal, vertical, left, right, 0, 0); 44 | } 45 | 46 | /** 47 | * @param horizontal 内部水平距离(px) 48 | * @param vertical 内部竖直距离(px) 49 | * @param left 最左边距离(px)，默认为0 50 | * @param right 最右边距离(px),默认为0 51 | * @param top 最顶端距离(px),默认为0 52 | * @param bottom 最底端距离(px),默认为0 53 | */ 54 | public GridSpaceDecoration(int horizontal, int vertical, int left, int right, int top, int bottom) { 55 | mHorizontal = horizontal; 56 | mVertical = vertical; 57 | mLeft = left; 58 | mRight = right; 59 | mTop = top; 60 | mBottom = bottom; 61 | } 62 | 63 | @Override 64 | public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, 65 | @NonNull RecyclerView parent, @NonNull RecyclerView.State state) { 66 | if (isFirst) { 67 | init(parent); 68 | isFirst = false; 69 | } 70 | if (mManager.getOrientation() == LinearLayoutManager.VERTICAL) { 71 | handleVertical(outRect, view, parent, state); 72 | } else { 73 | handleHorizontal(outRect, view, parent, state); 74 | } 75 | } 76 | 77 | /** 78 | * 计算Item的左边Decoration(outRect.left)尺寸,当orientation为Vertical时调用 79 | * @param spanIndex 需要计算的Item对应的spanIndex 80 | * @param sizeAvg 每个Item需要填充的尺寸 81 | * @return outRect.left 82 | */ 83 | private int computeLeft(int spanIndex, int sizeAvg) { 84 | if (spanIndex == 0) { 85 | return mLeft; 86 | } else if (spanIndex >= mSpanCount / 2) { 87 | //从右边算起 88 | return sizeAvg - computeRight(spanIndex, sizeAvg); 89 | } else { 90 | //从左边算起 91 | return mHorizontal - computeRight(spanIndex - 1, sizeAvg); 92 | } 93 | } 94 | 95 | /** 96 | * 计算Item的右边Decoration(outRect.right)尺寸,当orientation为Vertical时调用 97 | * @param spanIndex 需要计算的Item对应的spanIndex 98 | * @param sizeAvg 每个Item需要填充的尺寸 99 | * @return outRect.right 100 | */ 101 | private int computeRight(int spanIndex, int sizeAvg) { 102 | if (spanIndex == mSpanCount - 1) { 103 | return mRight; 104 | } else if (spanIndex >= mSpanCount / 2) { 105 | //从右边算起 106 | return mHorizontal - computeLeft(spanIndex + 1, sizeAvg); 107 | } else { 108 | //从左边算起 109 | return sizeAvg - computeLeft(spanIndex, sizeAvg); 110 | } 111 | } 112 | 113 | /** 114 | * 计算Item的顶部边Decoration(outRect.Top)尺寸,当orientation为Horizontal时调用 115 | * @param spanIndex 需要计算的Item对应的spanIndex 116 | * @param sizeAvg 每个Item需要填充的尺寸 117 | * @return outRect.top 118 | */ 119 | private int computeTop(int spanIndex, int sizeAvg) { 120 | if (spanIndex == 0) { 121 | return mTop; 122 | } else if (spanIndex >= mSpanCount / 2) { 123 | //从底部算起 124 | return sizeAvg - computeBottom(spanIndex, sizeAvg); 125 | } else { 126 | //从顶端算起 127 | return mVertical - computeBottom(spanIndex - 1, sizeAvg); 128 | } 129 | } 130 | 131 | /** 132 | * 计算Item的底部Decoration(outRect.bottom)尺寸,当orientation为Horizontal时调用 133 | * @param spanIndex 需要计算的Item对应的spanIndex 134 | * @param sizeAvg 每个Item需要填充的尺寸 135 | * @return outRect.bottom 136 | */ 137 | private int computeBottom(int spanIndex, int sizeAvg) { 138 | if (spanIndex == mSpanCount - 1) { 139 | return mBottom; 140 | } else if (spanIndex >= mSpanCount / 2) { 141 | //从底部算起 142 | return mVertical - computeTop(spanIndex + 1, sizeAvg); 143 | } else { 144 | //从顶端算起 145 | return sizeAvg - computeTop(spanIndex, sizeAvg); 146 | } 147 | } 148 | 149 | /** 150 | * orientation为Vertical时调用，处理Vertical下的Offset 151 | * {@link #getItemOffsets(Rect, View, RecyclerView, RecyclerView.State)} 152 | */ 153 | private void handleVertical(Rect outRect, View view, RecyclerView parent, 154 | RecyclerView.State state) { 155 | GridLayoutManager.LayoutParams lp = (GridLayoutManager.LayoutParams) view.getLayoutParams(); 156 | int childPos = parent.getChildAdapterPosition(view); 157 | int sizeAvg = (int) ((mHorizontal * (mSpanCount - 1) + mLeft + mRight) * 1f / mSpanCount); 158 | int spanSize = lp.getSpanSize(); 159 | int spanIndex = lp.getSpanIndex(); 160 | outRect.left = computeLeft(spanIndex, sizeAvg); 161 | if (spanSize == 0 || spanSize == mSpanCount) { 162 | outRect.right = sizeAvg - outRect.left; 163 | } else { 164 | outRect.right = computeRight(spanIndex + spanSize - 1, sizeAvg); 165 | } 166 | outRect.top = mVertical / 2; 167 | outRect.bottom = mVertical / 2; 168 | if (isFirstRaw(childPos)) { 169 | outRect.top = mTop; 170 | } 171 | if (isLastRaw(childPos)) { 172 | outRect.bottom = mBottom; 173 | } 174 | } 175 | 176 | /** 177 | * orientation为Horizontal时调用，处理Horizontal下的Offset 178 | * {@link #getItemOffsets(Rect, View, RecyclerView, RecyclerView.State)} 179 | */ 180 | private void handleHorizontal(Rect outRect, View view, RecyclerView parent, 181 | RecyclerView.State state) { 182 | GridLayoutManager.LayoutParams lp = (GridLayoutManager.LayoutParams) view.getLayoutParams(); 183 | int childPos = parent.getChildAdapterPosition(view); 184 | int spanSize = lp.getSpanSize(); 185 | int spanIndex = lp.getSpanIndex(); 186 | int sizeAvg = (int) ((mVertical * (mSpanCount - 1) + mTop + mBottom) * 1f / mSpanCount); 187 | outRect.top = computeTop(spanIndex,sizeAvg); 188 | if (spanSize == 0 || spanSize == mSpanCount) { 189 | outRect.bottom = sizeAvg - outRect.top; 190 | } else { 191 | outRect.bottom = computeBottom(spanIndex + spanSize - 1, sizeAvg); 192 | } 193 | outRect.left = mHorizontal/2; 194 | outRect.right = mHorizontal/2; 195 | if (isFirstRaw(childPos)){ 196 | outRect.left = mLeft; 197 | } 198 | if (isLastRaw(childPos)){ 199 | outRect.right = mRight; 200 | } 201 | } 202 | 203 | /** 204 | * 初始化 205 | */ 206 | private void init(RecyclerView parent) { 207 | RecyclerView.LayoutManager manager = parent.getLayoutManager(); 208 | if (!(manager instanceof GridLayoutManager)) { 209 | throw new IllegalArgumentException("LayoutManger must instance of GridLayoutManager " + 210 | "while using GridSpaceDecoration"); 211 | } 212 | mManager = (GridLayoutManager) manager; 213 | mSpanCount = getSpanCount(); 214 | mChildCount = parent.getAdapter().getItemCount(); 215 | } 216 | 217 | protected int getSpanIndex(int pos) { 218 | int spanIndex; 219 | GridLayoutManager.SpanSizeLookup lookup = mManager.getSpanSizeLookup(); 220 | lookup.setSpanIndexCacheEnabled(true); 221 | spanIndex = lookup.getSpanIndex(pos, mSpanCount); 222 | return spanIndex; 223 | } 224 | 225 | protected int getSpanCount() { 226 | return mManager.getSpanCount(); 227 | } 228 | 229 | protected boolean isFirstColumn(GridLayoutManager.LayoutParams params, int pos) { 230 | return params.getSpanIndex() == 0; 231 | } 232 | 233 | protected boolean isFirstRaw(int pos) { 234 | if (mChildCount <= 0) { 235 | return false; 236 | } 237 | GridLayoutManager.SpanSizeLookup lookup = mManager.getSpanSizeLookup(); 238 | return lookup.getSpanGroupIndex(pos, mSpanCount) == lookup.getSpanGroupIndex(0, mSpanCount); 239 | } 240 | 241 | protected boolean isLastRaw(int pos) { 242 | if (mChildCount <= 0) { 243 | return false; 244 | } 245 | GridLayoutManager.SpanSizeLookup lookup = mManager.getSpanSizeLookup(); 246 | return lookup.getSpanGroupIndex(pos, mSpanCount) == lookup.getSpanGroupIndex(mChildCount - 1, mSpanCount); 247 | } 248 | 249 | protected boolean isLastColumn(GridLayoutManager.LayoutParams params, int pos) { 250 | int index = params.getSpanIndex(); 251 | int size = params.getSpanSize(); 252 | return index + size == mSpanCount; 253 | } 254 | 255 | 256 | public int getHorizontal() { 257 | return mHorizontal; 258 | } 259 | 260 | public void setHorizontal(int mHorizontal) { 261 | this.mHorizontal = mHorizontal; 262 | } 263 | 264 | public int getVertical() { 265 | return mVertical; 266 | } 267 | 268 | public void setVertical(int mVertical) { 269 | this.mVertical = mVertical; 270 | } 271 | 272 | public int getLeft() { 273 | return mLeft; 274 | } 275 | 276 | public void setLeft(int mLeft) { 277 | this.mLeft = mLeft; 278 | } 279 | 280 | public int getRight() { 281 | return mRight; 282 | } 283 | 284 | public void setRight(int mRight) { 285 | this.mRight = mRight; 286 | } 287 | 288 | public int getTop() { 289 | return mTop; 290 | } 291 | 292 | public void setmTop(int mTop) { 293 | this.mTop = mTop; 294 | } 295 | 296 | public int getmBottom() { 297 | return mBottom; 298 | } 299 | 300 | public void setmBottom(int mBottom) { 301 | this.mBottom = mBottom; 302 | } 303 | } 304 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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