{"id":109446,"date":"2026-09-24T04:57:00","date_gmt":"2026-09-23T20:57:00","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/109446.html"},"modified":"2026-09-24T04:57:00","modified_gmt":"2026-09-23T20:57:00","slug":"android-measurespec-%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/109446.html","title":{"rendered":"Android MeasureSpec \u8be6\u89e3"},"content":{"rendered":"

MeasureSpec \u662f\u7236\u5bb9\u5668\u5411\u5b50 View \u4f20\u9012\u5c3a\u5bf8\u7ea6\u675f\u7684\u552f\u4e00\u8f7d\u4f53\uff1a\u4e00\u4e2a 32 \u4f4d int\uff0c\u9ad8 2 \u4f4d\u662f\u6d4b\u91cf\u6a21\u5f0f\uff0c\u4f4e 30 \u4f4d\u662f\u6d4b\u91cf\u5c3a\u5bf8\u3002<\/p>\n

\n

1. \u4e3a\u4ec0\u4e48\u9700\u8981 MeasureSpec<\/h3>\n

Android \u7684 View \u662f\\”\u7236\u7ba1\u5b50\\”\u7684\u6811\u5f62\u7ed3\u6784\uff1a\u5b50 View \u77e5\u9053\u81ea\u5df1\u5185\u5bb9\u9700\u8981\u591a\u5927\uff0c\u7236\u5bb9\u5668\u77e5\u9053\u8fd9\u5757\u5730\u76d8\u8fd8\u5269\u591a\u5927\u3002\u4e24\u8005\u4fe1\u606f\u4e0d\u5bf9\u79f0\uff0c\u5c31\u9700\u8981\u4e00\u4efd\u534f\u5546\u534f\u8bae\u2014\u2014\u53ea\u4f20\u4e00\u4e2a int size \u65e0\u6cd5\u533a\u5206\\”\u786c\u6027\u8981\u6c42\\”\u548c\\”\u4e0a\u9650\\”\uff0c\u6240\u4ee5\u6709\u4e86 MeasureSpec\uff1a\u5c3a\u5bf8 + \u610f\u56fe\u3002<\/p>\n

\u6574\u6761\u94fe\u8def\u5206\u56db\u6b65\uff1a<\/p>\n

\u2460 \u7236\u5bb9\u5668\uff08\u6bd4\u5982 LinearLayout\uff09
\n \u2502 \u7528\u81ea\u5df1\u7684 MeasureSpec + \u5b50\u7684 LayoutParams\uff0c\u7b97\u51fa\u5b50\u8be5\u9075\u5b88\u7684 spec
\n \u25bc
\n\u2461 \u5b50 View.measure(childWidthSpec, childHeightSpec)
\n \u2502 measure() \u5185\u90e8\u56de\u8c03 onMeasure()\uff0c\u5b50\u5728\u8fd9\u91cc\u7b97\u51fa\u300c\u6211\u8981\u591a\u5bbd\u591a\u9ad8\u300d
\n \u25bc
\n\u2462 \u5b50 setMeasuredDimension(w, h)
\n \u2502 \u628a\u7b97\u51fa\u7684\u7ed3\u679c\u5206\u522b\u5199\u8fdb mMeasuredWidth \u548c mMeasuredHeight \u4e24\u4e2a\u5b57\u6bb5
\n \u25bc
\n\u2463 \u7236\u5bb9\u5668\u8bfb\u56de\u8fd9\u4e24\u4e2a\u503c\uff0c\u5728 onLayout() \u91cc\u6446\u653e\u5b50\u7684\u4f4d\u7f6e\uff08\u6d4b\u91cf\u9636\u6bb5\u81f3\u6b64\u7ed3\u675f\uff09<\/p>\n

\u4e00\u53e5\u8bdd\u6982\u62ec\uff1a\u7236\u51fa\u89c4\u5219 \u2192 \u5b50\u505a\u8ba1\u7b97 \u2192 \u7236\u6536\u7ed3\u679c\u3002\u89c4\u5219\u6765\u81ea\u300c\u7236\u7684 MeasureSpec + \u5b50\u7684 LayoutParams\u300d\uff0c\u8ba1\u7b97\u53d1\u751f\u5728 onMeasure()\uff0c\u7ed3\u679c\u88ab\u7236\u5bb9\u5668\u7528\u5728 onLayout() \u91cc\u3002<\/p>\n

\n

2. \u4e8c\u8fdb\u5236\u7ed3\u6784\uff1a\u4e00\u4e2a int \u88c5\u4e24\u6837\u4e1c\u897f<\/h3>\n

MeasureSpec \u672c\u8d28\u4e0a\u662f\u5bf9\u4e00\u4e2a int \u7684\u5c01\u88c5\uff08Java \u91cc\u662f View \u7684\u9759\u6001\u5185\u90e8\u7c7b\uff0cKotlin \u91cc\u53ef\u4ee5\u7406\u89e3\u4e3a\u4e00\u4e2a value class\uff09\u3002<\/p>\n

31 30 | 29 ……………………………. 0
\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2502 Mode \u2502 Size \u2502
\n\u2502 2 bit\u2502 30 bit \u2502
\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518
\n \u2191 \u9ad8 2 \u4f4d\u5b58\u6a21\u5f0f \u2191 \u4f4e 30 \u4f4d\u5b58\u5c3a\u5bf8<\/p>\n

\u6838\u5fc3\u5e38\u91cf\uff1a<\/p>\n

public<\/span> static<\/span> class<\/span> MeasureSpec<\/span> {<\/p>\n

<\/span>
\n private<\/span> static<\/span> final<\/span> int<\/span> MODE_SHIFT<\/span> =<\/span> 30<\/span>;<\/span>
\n private<\/span> static<\/span> final<\/span> int<\/span> MODE_MASK<\/span> =<\/span> 0x3<\/span> <<<\/span> MODE_SHIFT<\/span>;<\/span> \/\/ 0xC0000000<\/span><\/p>\n

public<\/span> static<\/span> final<\/span> int<\/span> UNSPECIFIED<\/span> =<\/span> 0<\/span> <<<\/span> MODE_SHIFT<\/span>;<\/span> \/\/ 0x00000000<\/span>
\n public<\/span> static<\/span> final<\/span> int<\/span> EXACTLY<\/span> =<\/span> 1<\/span> <<<\/span> MODE_SHIFT<\/span>;<\/span> \/\/ 0x40000000<\/span>
\n public<\/span> static<\/span> final<\/span> int<\/span> AT_MOST<\/span> =<\/span> 2<\/span> <<<\/span> MODE_SHIFT<\/span>;<\/span> \/\/ 0x80000000<\/span>
\n}<\/span><\/p>\n

\u6253\u5305\u4e0e\u89e3\u5305\uff1a<\/p>\n

\/\/ \u6253\u5305\uff1a\u628a size \u622a\u65ad\u5230 30 \u4f4d\uff0c\u548c mode \u6309\u4f4d\u6216<\/span>
\npublic<\/span> static<\/span> int<\/span> makeMeasureSpec<\/span>(<\/span>int<\/span> size,<\/span> int<\/span> mode)<\/span> {<\/p>\n

<\/span>
\n \/\/ \u4fdd\u8bc1 size \u4e0d\u4f1a\u6c61\u67d3\u9ad8 2 \u4f4d\u7684 mode<\/span>
\n return<\/span> (<\/span>size &<\/span> ~<\/span>MODE_MASK<\/span>)<\/span> |<\/span> (<\/span>mode &<\/span> MODE_MASK<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

\/\/ \u89e3\u5305<\/span>
\npublic<\/span> static<\/span> int<\/span> getMode<\/span>(<\/span>int<\/span> measureSpec)<\/span> {<\/p>\n

<\/span>
\n return<\/span> (<\/span>measureSpec &<\/span> MODE_MASK<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

public<\/span> static<\/span> int<\/span> getSize<\/span>(<\/span>int<\/span> measureSpec)<\/span> {<\/p>\n

<\/span>
\n return<\/span> (<\/span>measureSpec &<\/span> ~<\/span>MODE_MASK<\/span>)<\/span>;<\/span> \/\/ \u5373 0x3FFFFFFF\uff0c\u6700\u5927\u7ea6 1G<\/span>
\n}<\/span><\/p>\n

\u624b\u52a8\u6784\u9020 spec \u7684\u5e38\u89c1\u5199\u6cd5\uff1a<\/p>\n

int<\/span> spec =<\/span> View.<\/span>MeasureSpec<\/span>.<\/span>makeMeasureSpec<\/span>(<\/span>300<\/span>,<\/span> View.<\/span>MeasureSpec<\/span>.<\/span>EXACTLY<\/span>)<\/span>;<\/span>
\nview.<\/span>measure<\/span>(<\/span>spec,<\/span> spec)<\/span>;<\/span><\/p>\n

\n

3. \u4e09\u79cd\u6d4b\u91cf\u6a21\u5f0f<\/h3>\n\n\n \u6a21\u5f0f
\n \u5e38\u91cf
\n \u7236\u5bb9\u5668\u7684\u542b\u4e49
\n \u5b50 View \u5e94\u8be5\u600e\u4e48\u505a
\n <\/tr>\n\n\n\n\n
EXACTLY<\/td>\n1 << 30<\/td>\n\u4f60\u7684\u5c3a\u5bf8\u5df2\u7ecf\u5b9a\u4e86\uff0c\u5c31\u662f size<\/td>\n\u76f4\u63a5\u4f7f\u7528 specSize\uff0c\u4e0d\u8981\u518d\u4e89\u8fa9<\/td>\n<\/tr>\n
AT_MOST<\/td>\n2 << 30<\/td>\n\u4f60\u6700\u5927\u4e0d\u80fd\u8d85\u8fc7 size<\/td>\n\u53d6\u300c\u5185\u5bb9\u9700\u8981\u7684\u5927\u5c0f\u300d\u4e0e specSize \u7684\u8f83\u5c0f\u503c<\/td>\n<\/tr>\n
UNSPECIFIED<\/td>\n0<\/td>\n\u6211\u4e0d\u7ba1\u4f60\uff0c\u4f60\u81ea\u5df1\u968f\u610f<\/td>\n\u5b8c\u5168\u6309\u5185\u5bb9\u9700\u8981\u8fd4\u56de\uff08\u53ef\u6eda\u52a8\u5bb9\u5668\u5e38\u7528\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5bf9\u5e94\u5230 XML \u5c5e\u6027\uff0c\u76f4\u89c9\u4e0a\uff1a<\/p>\n\n\n LayoutParams
\n \u7236\u4e3a EXACTLY
\n \u7236\u4e3a AT_MOST
\n \u7236\u4e3a UNSPECIFIED
\n <\/tr>\n\n\n\n\n
match_parent<\/td>\nEXACTLY(\u7236\u53ef\u7528\u7a7a\u95f4)<\/td>\nAT_MOST(\u7236\u53ef\u7528\u7a7a\u95f4)<\/td>\nUNSPECIFIED(0 \u6216\u7236\u53ef\u7528\u7a7a\u95f4)<\/td>\n<\/tr>\n
wrap_content<\/td>\nAT_MOST(\u7236\u53ef\u7528\u7a7a\u95f4)<\/td>\nAT_MOST(\u7236\u53ef\u7528\u7a7a\u95f4)<\/td>\nUNSPECIFIED(0 \u6216\u7236\u53ef\u7528\u7a7a\u95f4)<\/td>\n<\/tr>\n
100dp<\/td>\nEXACTLY(100dp)<\/td>\nEXACTLY(100dp)<\/td>\nEXACTLY(100dp)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u53ef\u4ee5\u770b\u51fa\uff1a\u5177\u4f53\u6570\u503c\u6c38\u8fdc\u53d8\u6210 EXACTLY\uff0c\u8fd9\u662f\u6700\u7a33\u5b9a\u7684\u4e00\u6761\u89c4\u5219\u3002<\/p>\n

\u5178\u578b\u7684 UNSPECIFIED \u573a\u666f\uff1a<\/p>\n

    \n
  • ScrollView \u6d4b\u91cf\u552f\u4e00\u5b50 View \u7684\u9ad8\u5ea6\uff08\u53ea\u80fd\u6eda\u4e00\u5c4f\uff0c\u6240\u4ee5\u9ad8\u5ea6\u4e0d\u8bbe\u4e0a\u9650\uff09\u3002<\/li>\n
  • ListView \/ RecyclerView \u6d4b\u91cf item \u7684\u9ad8\u5ea6\u3002<\/li>\n
  • \u624b\u52a8\u8c03\u7528 view.measure(0, 0) \u6216 makeMeasureSpec(0, UNSPECIFIED) \u505a\u9884\u6d4b\u91cf\u3002<\/li>\n
  • PopupWindow \u5728 WRAP_CONTENT \u4e0b\u6d4b\u91cf\u5185\u5bb9\u3002<\/li>\n<\/ul>\n
    \n

    4. \u6838\u5fc3 API \u901f\u67e5<\/h3>\n

    \/\/ —- \u6253\u5305 \/ \u89e3\u5305 —-<\/span>
    \nView.<\/span>MeasureSpec<\/span>.<\/span>makeMeasureSpec<\/span>(<\/span>int<\/span> size,<\/span> int<\/span> mode)<\/span> \/\/ \u6784\u9020\u4e00\u4e2a measuicSpec<\/span>
    \nView.<\/span>MeasureSpec<\/span>.<\/span>getMode<\/span>(<\/span>int<\/span> measureSpec)<\/span> \/\/ \u53d6\u6a21\u5f0f<\/span>
    \nView.<\/span>MeasureSpec<\/span>.<\/span>getSize<\/span>(<\/span>int<\/span> measureSpec)<\/span> \/\/ \u53d6\u5c3a\u5bf8<\/span>
    \nView.<\/span>MeasureSpec<\/span>.<\/span>toString<\/span>(<\/span>int<\/span> measureSpec)<\/span> \/\/ \u8c03\u8bd5\u6253\u5370\uff0c\u5982 \\”EXACTLY 1080\\”<\/span><\/p>\n

    \/\/ —- \u7236\u5bb9\u5668\u7528\u5b83\u7ed9\u5b50 View \u751f\u6210 spec —-<\/span>
    \nViewGroup<\/span>.<\/span>getChildMeasureSpec<\/span>(<\/span>int<\/span> spec,<\/span> int<\/span> padding,<\/span> int<\/span> childDimension)<\/span><\/p>\n

    \/\/ —- \u5b50 View \u7528\u5b83\u88c1\u526a\u81ea\u5df1\u7684\u6d4b\u91cf\u7ed3\u679c —-<\/span>
    \nView<\/span>.<\/span>getDefaultSize<\/span>(<\/span>int<\/span> size,<\/span> int<\/span> measureSpec)<\/span>
    \nView<\/span>.<\/span>resolveSize<\/span>(<\/span>int<\/span> size,<\/span> int<\/span> measureSpec)<\/span> \/\/ \u8fd4\u56de\u7eaf\u5c3a\u5bf8<\/span>
    \nView<\/span>.<\/span>resolveSizeAndState<\/span>(<\/span>int<\/span> size,<\/span> int<\/span> ms,<\/span> int<\/span> childMeasuredState)<\/span> \/\/ \u5e26\u72b6\u6001\u4f4d<\/span><\/p>\n

    \/\/ —- \u5b50 View \u4e0a\u62a5\u7ed3\u679c —-<\/span>
    \nView<\/span>.<\/span>setMeasuredDimension<\/span>(<\/span>int<\/span> measuredWidth,<\/span> int<\/span> measuredHeight)<\/span>
    \nView<\/span>.<\/span>getMeasuredWidth<\/span>(<\/span>)<\/span> \/<\/span> getMeasuredHeight<\/span>(<\/span>)<\/span>
    \nView<\/span>.<\/span>getMeasuredState<\/span>(<\/span>)<\/span><\/p>\n

    \n

    5. MeasureSpec \u4ece\u54ea\u6765\uff1a\u6d4b\u91cf\u89c4\u5219\u7684\u5411\u4e0b\u4f20\u9012<\/h3>\n

    5.1 \u6811\u9876\uff1aDecorView \/ ViewRootImpl<\/h4>\n

    \u6d4b\u91cf\u4ece\u6839\u8282\u70b9\u5f00\u59cb\u3002ViewRootImpl.performMeasure() \u4f1a\u62ff\u5230\u7a97\u53e3\u53ef\u7528\u5c3a\u5bf8\uff0c\u7136\u540e\u8c03\u7528\uff1a<\/p>\n

    private<\/span> static<\/span> int<\/span> getRootMeasureSpec<\/span>(<\/span>int<\/span> windowSize,<\/span> int<\/span> measurement)<\/span> {<\/p>\n

    <\/span>
    \n int<\/span> measureSpec;<\/span>
    \n switch<\/span> (<\/span>measurement)<\/span> {<\/p>\n

    <\/span>
    \n case<\/span> ViewGroup.<\/span>LayoutParams<\/span>.<\/span>MATCH_PARENT<\/span>:<\/span>
    \n \/\/ \u6491\u6ee1\u7a97\u53e3 \u2192 \u786c\u6027\u8981\u6c42<\/span>
    \n measureSpec =<\/span> MeasureSpec<\/span>.<\/span>makeMeasureSpec<\/span>(<\/span>windowSize,<\/span> MeasureSpec<\/span>.<\/span>EXACTLY<\/span>)<\/span>;<\/span>
    \n break<\/span>;<\/span>
    \n case<\/span> ViewGroup.<\/span>LayoutParams<\/span>.<\/span>WRAP_CONTENT<\/span>:<\/span>
    \n \/\/ \u6700\u591a\u6491\u6ee1\u7a97\u53e3 \u2192 \u4e0a\u9650<\/span>
    \n measureSpec =<\/span> MeasureSpec<\/span>.<\/span>makeMeasureSpec<\/span>(<\/span>windowSize,<\/span> MeasureSpec<\/span>.<\/span>AT_MOST<\/span>)<\/span>;<\/span>
    \n break<\/span>;<\/span>
    \n default<\/span>:<\/span>
    \n \/\/ \u5177\u4f53\u6570\u503c \u2192 \u786c\u6027\u8981\u6c42<\/span>
    \n measureSpec =<\/span> MeasureSpec<\/span>.<\/span>makeMeasureSpec<\/span>(<\/span>measurement,<\/span> MeasureSpec<\/span>.<\/span>EXACTLY<\/span>)<\/span>;<\/span>
    \n break<\/span>;<\/span>
    \n }<\/span>
    \n return<\/span> measureSpec;<\/span>
    \n}<\/span><\/p>\n

    \u8fd9\u5c31\u662f\\”\u6839 MeasureSpec \u7684\u751f\u6210\u89c4\u5219\\”\uff0c\u4e5f\u662f\u6574\u4e2a\u6620\u5c04\u8868\u7684\u7b2c\u4e00\u884c\u539f\u578b\uff1aMATCH_PARENT \u2192 EXACTLY\u3001WRAP_CONTENT \u2192 AT_MOST\u3001\u56fa\u5b9a\u503c \u2192 EXACTLY\u3002<\/p>\n

    5.2 \u4e2d\u95f4\u5c42\uff1aViewGroup.getChildMeasureSpec<\/h4>\n

    \u6bcf\u4e00\u4e2a ViewGroup \u5728\u6d4b\u91cf\u81ea\u5df1\u7684\u5b69\u5b50\u65f6\uff0c\u90fd\u8981\u628a\u300c\u81ea\u5df1\u7684 spec\u300d\u548c\u300c\u5b69\u5b50\u7684 LayoutParams\u300d\u5408\u6210\u300c\u5b69\u5b50\u7684 spec\u300d\u3002\u8fd9\u6bb5\u903b\u8f91\u88ab\u62bd\u53d6\u6210\u4e86\u516c\u5171\u9759\u6001\u65b9\u6cd5\uff1a<\/p>\n

    public<\/span> static<\/span> int<\/span> getChildMeasureSpec<\/span>(<\/span>int<\/span> spec,<\/span> int<\/span> padding,<\/span> int<\/span> childDimension)<\/span> {<\/p>\n

    <\/span>
    \n int<\/span> specMode =<\/span> MeasureSpec<\/span>.<\/span>getMode<\/span>(<\/span>spec)<\/span>;<\/span>
    \n int<\/span> specSize =<\/span> MeasureSpec<\/span>.<\/span>getSize<\/span>(<\/span>spec)<\/span>;<\/span><\/p>\n

    \/\/ \u53ef\u7528\u7a7a\u95f4 = \u7236\u7ed9\u7684\u5c3a\u5bf8 – \u5df2\u5360\u7528\u7684 padding \/ margin<\/span>
    \n int<\/span> size =<\/span> Math<\/span>.<\/span>max<\/span>(<\/span>0<\/span>,<\/span> specSize –<\/span> padding)<\/span>;<\/span><\/p>\n

    int<\/span> resultSize =<\/span> 0<\/span>;<\/span>
    \n int<\/span> resultMode =<\/span> 0<\/span>;<\/span><\/p>\n

    switch<\/span> (<\/span>specMode)<\/span> {<\/p>\n

    <\/span>
    \n \/\/ \u7236\u5bb9\u5668\u81ea\u5df1\u88ab\u5f3a\u5236\u56fa\u5b9a\u5927\u5c0f<\/span>
    \n case<\/span> MeasureSpec<\/span>.<\/span>EXACTLY<\/span>:<\/span>
    \n if<\/span> (<\/span>childDimension >=<\/span> 0<\/span>)<\/span> {<\/p>\n

    <\/span>
    \n \/\/ \u5b50 View \u8981\u5177\u4f53\u6570\u503c\uff0c\u6ee1\u8db3\u5b83<\/span>
    \n resultSize =<\/span> childDimension;<\/span>
    \n resultMode =<\/span> MeasureSpec<\/span>.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

    MeasureSpec \u662f\u7236\u5bb9\u5668\u5411\u5b50 View \u4f20\u9012\u5c3a\u5bf8\u7ea6\u675f\u7684\u552f\u4e00\u8f7d\u4f53\uff1a\u4e00\u4e2a 32 \u4f4d int\uff0c\u9ad8 2 \u4f4d\u662f\u6d4b\u91cf\u6a21\u5f0f\uff0c\u4f4e 30 \u4f4d\u662f\u6d4b\u91cf\u5c3a\u5bf8\u3002 1. \u4e3a\u4ec0\u4e48\u9700\u8981 MeasureSpec
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