{"id":2781,"date":"2023-08-14T14:52:43","date_gmt":"2023-08-14T06:52:43","guid":{"rendered":"https:\/\/www.yimenyun.cn\/emen\/?p=2781"},"modified":"2023-08-14T14:52:43","modified_gmt":"2023-08-14T06:52:43","slug":"app%e5%bc%80%e5%8f%91view%e5%92%8ctext%e7%bb%84%e4%bb%b6%e4%bb%8b%e7%bb%8d","status":"publish","type":"post","link":"https:\/\/www.yimenyun.cn\/emen\/2781\/","title":{"rendered":"app\u5f00\u53d1view\u548ctext\u7ec4\u4ef6\u4ecb\u7ecd"},"content":{"rendered":"

\u5728App\u5f00\u53d1\u4e2d\uff0cView\u548cText\u662f\u6700\u4e3a\u5e38\u7528\u7684\u4e24\u4e2a\u7ec4\u4ef6\u4e4b\u4e00\u3002View\u662fAndroid\u7cfb\u7edf\u4e2d\u6240\u6709\u7ec4\u4ef6\u7684\u57fa\u7c7b\uff0c\u662f\u5e03\u5c40\u5bb9\u5668\u7684\u57fa\u7840\uff0c\u800cText\u5219\u662f\u5728View\u7684\u57fa\u7840\u4e0a\u5c01\u88c5\u4e86\u6587\u5b57\u663e\u793a\u7684\u529f\u80fd\u3002<\/p>\n

View\u7684\u539f\u7406<\/p>\n

View\u662fAndroid\u7cfb\u7edf\u4e2d\u6240\u6709\u7ec4\u4ef6\u7684\u57fa\u7c7b\uff0c\u4e5f\u662f\u5e03\u5c40\u5bb9\u5668\u7684\u57fa\u7840\u3002\u5b83\u662f\u4e00\u4e2a\u77e9\u5f62\u533a\u57df\uff0c\u7528\u6765\u5c55\u793a\u6216\u8005\u653e\u7f6e\u5176\u4ed6\u7ec4\u4ef6\u3002\u6bcf\u4e00\u4e2aView\u90fd\u6709\u81ea\u5df1\u7684\u5750\u6807\uff08left,top\uff09\u548c\uff08right,bottom\uff09\uff0c\u8fd9\u4e9b\u5750\u6807\u662f\u76f8\u5bf9\u4e8e\u5b83\u7684\u7236\u5bb9\u5668\uff08\u5373\u5305\u542b\u5b83\u7684\u5bb9\u5668\uff09\u6765\u8bf4\u7684\u3002View\u7684\u5927\u5c0f\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6eWidth\u548cHeight\u6765\u786e\u5b9a\uff0c\u4e5f\u53ef\u4ee5\u6839\u636e\u5185\u5bb9\u81ea\u52a8\u9002\u914d\u5927\u5c0f\u3002<\/p>\n

View\u7684\u7ed8\u5236\u8fc7\u7a0b\u53ef\u4ee5\u5206\u4e3a\u4e09\u4e2a\u9636\u6bb5\uff1aMeasure\uff0cLayout\u548cDraw\u3002<\/p>\n

1. Measure\u9636\u6bb5\uff1a\u6d4b\u91cfView\u7684\u5927\u5c0f\u3002<\/p>\n

\u5728\u8fd9\u4e2a\u9636\u6bb5\uff0c\u7cfb\u7edf\u4f1a\u8c03\u7528View\u7684`onMeasure`\u65b9\u6cd5\u6765\u6d4b\u91cfView\u7684\u5927\u5c0f\u3002\u5728`onMeasure`\u65b9\u6cd5\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u7ed9View\u8bbe\u7f6e\u4e00\u4e2a\u56fa\u5b9a\u7684\u5927\u5c0f\u6216\u8005\u6839\u636e\u5176\u5185\u5bb9\u81ea\u9002\u5e94\u5927\u5c0f\u3002\u5927\u5c0f\u7684\u8bbe\u7f6e\u53ef\u4ee5\u901a\u8fc7MeasureSpec\u6765\u5b9e\u73b0\u3002<\/p>\n

MeasureSpec\u662f\u4e00\u4e2a32\u4f4d\u7684int\u578b\u6570\uff0c\u5176\u4e2d\u6700\u9ad8\u76842\u4f4d\u8868\u793aSpec\u7684mode\uff0c\u5269\u4e0b\u768430\u4f4d\u8868\u793aSpec\u7684size\u3002<\/p>\n

Spec\u7684mode\u6709\u4e09\u79cd\uff1aEXACTLY\uff0cAT_MOST\u548cUNSPECIFIED\u3002<\/p>\n

– EXACTLY\uff1a\u8868\u793aView\u7684\u5927\u5c0f\u5df2\u7ecf\u88ab\u56fa\u5b9a\u4e86\uff0c\u6211\u4eec\u53ea\u9700\u8981\u6839\u636e\u7ed9\u5b9a\u7684\u5927\u5c0f\u6765\u8bbe\u7f6eView\u7684\u5927\u5c0f\u5373\u53ef\u3002<\/p>\n

– AT_MOST\uff1a\u8868\u793aView\u7684\u5927\u5c0f\u4e0d\u80fd\u8d85\u8fc7\u7ed9\u5b9a\u7684\u503c\uff0c\u6211\u4eec\u9700\u8981\u7ed3\u5408View\u7684\u5185\u5bb9\u8ba1\u7b97\u51fa\u4e00\u4e2a\u5408\u9002\u7684\u5927\u5c0f\u3002<\/p>\n

– UNSPECIFIED\uff1a\u8868\u793aView\u5927\u5c0f\u4e0d\u53d7\u9650\u5236\uff0c\u6211\u4eec\u53ef\u4ee5\u8bbe\u7f6eView\u7684\u5927\u5c0f\u4e3a\u4efb\u610f\u503c\u3002<\/p>\n

2. Layout\u9636\u6bb5\uff1a\u786e\u5b9aView\u7684\u4f4d\u7f6e\u3002<\/p>\n

\u5728\u8fd9\u4e2a\u9636\u6bb5\uff0c\u7cfb\u7edf\u4f1a\u8c03\u7528ViewGroup\u7684`onLayout`\u65b9\u6cd5\uff0c\u6839\u636eView\u7684\u4f4d\u7f6e\u548c\u5927\u5c0f\u6765\u786e\u5b9aViewGroup\u4e2d\u6240\u6709\u5b50View\u7684\u4f4d\u7f6e\u3002<\/p>\n

3. Draw\u9636\u6bb5\uff1a\u5c06View\u7ed8\u5236\u5728\u5c4f\u5e55\u4e0a\u3002<\/p>\n

\u5728\u8fd9\u4e2a\u9636\u6bb5\uff0c\u7cfb\u7edf\u4f1a\u8c03\u7528View\u7684`onDraw`\u65b9\u6cd5\uff0c\u5c06View\u7ed8\u5236\u5728\u5c4f\u5e55\u4e0a\u3002<\/p>\n

Text\u7684\u539f\u7406<\/p>\n

Text\u662f\u5728View\u7684\u57fa\u7840\u4e0a\u5c01\u88c5\u4e86\u6587\u5b57\u663e\u793a\u7684\u529f\u80fd\u3002TextView\u662fText\u7ec4\u4ef6\u7684\u4e3b\u8981\u5b9e\u73b0\u7c7b\uff0c\u5b83\u53ef\u4ee5\u663e\u793a\u7b80\u5355\u7684\u6587\u672c\u5185\u5bb9\uff0c\u4e5f\u53ef\u4ee5\u663e\u793aHTML\u3001Markdown\u683c\u5f0f\u7684\u5185\u5bb9APP<\/a>\u3002TextView\u5c06\u6587\u672c\u5185\u5bb9\u5206\u6210\u591a\u884c\uff0c\u5e76\u6839\u636e\u5185\u5bb9\u548c\u8bbe\u7f6e\u7684\u683c\u5f0f\u6765\u786e\u5b9a\u6bcf\u4e00\u884c\u7684\u5bbd\u5ea6\u548c\u9ad8\u5ea6\uff0c\u7136\u540e\u5c06\u6bcf\u4e00\u884c\u7684\u6587\u5b57\u7ed8\u5236\u51fa\u6765\u3002<\/p>\n

TextView\u7684\u7ed8\u5236\u8fc7\u7a0b\u4e5f\u53ef\u4ee5\u5206\u4e3a\u4e09\u4e2a\u9636\u6bb5\uff1aMeasure\uff0cLayout\u548cDraw\u3002<\/p>\n

1. Measure\u9636\u6bb5\uff1a\u6d4b\u91cfTextView\u7684\u5927\u5c0f\u3002<\/p>\n

\u5728\u8fd9\u4e2a\u9636\u6bb5\uff0c\u901a\u8fc7\u8c03\u7528TextView\u7684`onMeasure`\u65b9\u6cd5\u6765\u6d4b\u91cfTextView\u7684\u5927\u5c0f\u3002\u5728TextView\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u6839\u636e\u6587\u5b57\u5185\u5bb9\u548c\u8bbe\u7f6e\u7684\u5b57\u4f53\u3001\u5b57\u53f7\u7b49\u53c2\u6570\u6765\u8ba1\u7b97TextView\u7684\u5927\u5c0f\u3002<\/p>\n

2. Layout\u9636\u6bb5\uff1a\u786e\u5b9aTextView\u7684\u4f4d\u7f6e\u3002<\/p>\n

\u5728\u8fd9\u4e2a\u9636\u6bb5\uff0c\u7cfb\u7edf\u4f1a\u8c03\u7528TextView\u7684`onLayout`\u65b9\u6cd5\uff0c\u6839\u636eTextView\u7684\u4f4d\u7f6e\u548c\u5927\u5c0f\u6765\u786e\u5b9aTextView\u5728\u5176\u7236\u5bb9\u5668\u4e2d\u7684\u4f4d\u7f6e\u3002<\/p>\n

3. Draw\u9636\u6bb5\uff1a\u5c06TextView\u7ed8\u5236\u5728\u5c4f\u5e55\u4e0a\u3002<\/p>\n

\u5728\u8fd9\u4e2a\u9636\u6bb5\uff0c\u7cfb\u7edf\u4f1a\u8c03\u7528TextView\u7684`onDraw`\u65b9\u6cd5\uff0c\u5c06TextView<\/p>\n

<\/figure>\n<\/p>\n

\u7ed8\u5236\u5728\u5c4f\u5e55\u4e0a\u3002\u5728\u7ed8\u5236TextView\u65f6\uff0c\u9700\u8981\u5148\u5c06\u6587\u5b57\u5206\u6210\u591a\u884c\uff0c\u5e76\u8ba1\u7b97\u51fa\u6bcf\u4e00\u884c\u7684\u5bbd\u5ea6\u548c\u9ad8\u5ea6\u3002\u7136\u540e\u5728\u786e\u5b9a\u6bcf\u4e00\u884c\u7684\u8d77\u59cb\u4f4d\u7f6e\u540e\uff0c\u6839\u636e\u8bbe\u7f6e\u7684\u5b57\u4f53\u3001\u5b57\u53f7\u7b49\u53c2\u6570\u548c\u6587\u5b57\u5185\u5bb9\uff0c\u5c06\u6bcf\u4e00\u884c\u7684\u6587\u5b57\u7ed8\u5236\u51fa\u6765\u3002<\/p>\n

\u603b\u7ed3<\/p>\n

View\u548cText\u662fAndroid\u5f00\u53d1\u4e2d\u6700\u4e3a\u5e38\u7528\u7684\u4e24\u4e2a\u7ec4\u4ef6\u4e4b\u4e00\u3002View\u662f\u6240\u6709\u7ec4\u4ef6\u7684\u57fa\u7c7b\uff0c\u7528\u6765\u5c55\u793a\u6216\u8005\u653e\u7f6e\u5176\u4ed6\u7ec4\u4ef6\uff1bText\u662f\u5728View\u7684\u57fa\u7840\u4e0a\u5c01\u88c5\u4e86\u6587\u5b57\u663e\u793a\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u663e\u793a\u7b80\u5355\u7684\u6587\u672c\u5185\u5bb9APP\u5f00\u53d1<\/a>\uff0c\u4e5f\u53ef\u4ee5\u663e\u793aHTML\u3001Markdown\u683c\u5f0f\u7684\u5185\u5bb9\u3002\u4e24\u8005\u90fd\u6709\u7740\u76f8\u4f3c\u7684\u7ed8\u5236\u8fc7\u7a0b\uff0c\u5373Measure\uff0cLayout\u548cDraw\u4e09\u4e2a\u9636\u6bb5\u3002\u5728\u5f00\u53d1App\u65f6\uff0c\u6211\u4eec\u9700\u8981\u6839\u636e\u5b9e\u9645\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u7ec4\u4ef6\u6765\u642d\u5efa\u754c\u9762\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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