{"id":747,"date":"2023-02-26T15:54:18","date_gmt":"2023-02-26T07:54:18","guid":{"rendered":"https:\/\/www.appblog.cn\/?p=747"},"modified":"2023-04-29T17:02:08","modified_gmt":"2023-04-29T09:02:08","slug":"android-obtain-physical-size-of-screen","status":"publish","type":"post","link":"https:\/\/www.appblog.cn\/index.php\/2023\/02\/26\/android-obtain-physical-size-of-screen\/","title":{"rendered":"Android\u83b7\u53d6\u5c4f\u5e55\u7684\u7269\u7406\u5c3a\u5bf8"},"content":{"rendered":"<h2>\u5c4f\u5e55\u82f1\u5bf8\u503c<\/h2>\n<p>\u8ba1\u7b97\u65b9\u6cd5\uff1a\u83b7\u53d6\u5230\u5c4f\u5e55\u7684\u5206\u8fa8\u7387<code>point.x<\/code>\u548c<code>point.y<\/code>\uff0c\u518d\u53d6\u51fa\u5c4f\u5e55\u7684DPI\uff08\u6bcf\u82f1\u5bf8\u7684\u50cf\u7d20\u6570\u91cf\uff09\uff0c\u8ba1\u7b97\u957f\u548c\u5bbd\u6709\u591a\u5c11\u82f1\u5bf8\uff0c\u5373\uff1a<code>point.x \/ dm.xdpi<\/code>\uff0c<code>point.y \/ dm.ydpi<\/code>\uff0c\u5c4f\u5e55\u7684\u957f\u548c\u5bbd\u7b97\u51fa\u6765\u4e86\uff0c\u518d\u7528\u52fe\u80a1\u5b9a\u7406\uff0c\u8ba1\u7b97\u51fa\u659c\u89d2\u8fb9\u7684\u957f\u5ea6\uff0c\u5373\u5c4f\u5e55\u5c3a\u5bf8\u3002<\/p>\n<p><!-- more --><\/p>\n<pre><code class=\"language-java\">\/**\n * \u5f97\u5230\u5c4f\u5e55\u7684\u7269\u7406\u5c3a\u5bf8\uff0c\u7531\u4e8e\u8be5\u5c3a\u5bf8\u662f\u5728\u51fa\u5382\u65f6\uff0c\u5382\u5546\u5199\u6b7b\u7684\uff0c\u6240\u4ee5\u4ec5\u4f9b\u53c2\u8003\n * \u8ba1\u7b97\u65b9\u6cd5\uff1a\u83b7\u53d6\u5230\u5c4f\u5e55\u7684\u5206\u8fa8\u7387:point.x\u548cpoint.y\uff0c\u518d\u53d6\u51fa\u5c4f\u5e55\u7684DPI\uff08\u6bcf\u82f1\u5bf8\u7684\u50cf\u7d20\u6570\u91cf\uff09\uff0c\n * \u8ba1\u7b97\u957f\u548c\u5bbd\u6709\u591a\u5c11\u82f1\u5bf8\uff0c\u5373\uff1apoint.x \/ dm.xdpi\uff0cpoint.y \/ dm.ydpi\uff0c\u5c4f\u5e55\u7684\u957f\u548c\u5bbd\u7b97\u51fa\u6765\u4e86\uff0c\n * \u518d\u7528\u52fe\u80a1\u5b9a\u7406\uff0c\u8ba1\u7b97\u51fa\u659c\u89d2\u8fb9\u7684\u957f\u5ea6\uff0c\u5373\u5c4f\u5e55\u5c3a\u5bf8\u3002\n * @param context\n * @return\n *\/\npublic static double getPhysicsScreenSize(Context context){\n    WindowManager manager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);\n    Point point = new Point();\n    manager.getDefaultDisplay().getRealSize(point);\n    DisplayMetrics dm = context.getResources().getDisplayMetrics();\n    int densityDpi = dm.densityDpi; \/\/\u5f97\u5230\u5c4f\u5e55\u7684\u5bc6\u5ea6\u503c\uff0c\u4f46\u662f\u8be5\u5bc6\u5ea6\u503c\u53ea\u80fd\u4f5c\u4e3a\u53c2\u8003\uff0c\u56e0\u4e3a\u4ed6\u662f\u56fa\u5b9a\u7684\u51e0\u4e2a\u5bc6\u5ea6\u503c\n    double x = Math.pow(point.x \/ dm.xdpi, 2); \/\/dm.xdpi\u662f\u5c4f\u5e55x\u65b9\u5411\u7684\u771f\u5b9e\u5bc6\u5ea6\u503c\uff0c\u6bd4\u4e0a\u9762\u7684densityDpi\u771f\u5b9e\n    double y = Math.pow(point.y \/ dm.ydpi, 2); \/\/dm.xdpi\u662f\u5c4f\u5e55y\u65b9\u5411\u7684\u771f\u5b9e\u5bc6\u5ea6\u503c\uff0c\u6bd4\u4e0a\u9762\u7684densityDpi\u771f\u5b9e\n    double screenInches = Math.sqrt(x + y);\n    return screenInches;\n}\n\nprivate double getScreenInches(Context context) {\n    WindowManager manager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);\n    Point point = new Point();\n    manager.getDefaultDisplay().getRealSize(point);\n    DisplayMetrics dm = context.getResources().getDisplayMetrics();\n    int densityDpi = dm.densityDpi; \/\/\u5f97\u5230\u5c4f\u5e55\u7684\u5bc6\u5ea6\u503c\uff0c\u4f46\u662f\u8be5\u5bc6\u5ea6\u503c\u53ea\u80fd\u4f5c\u4e3a\u53c2\u8003\uff0c\u56e0\u4e3a\u4ed6\u662f\u56fa\u5b9a\u7684\u51e0\u4e2a\u5bc6\u5ea6\u503c\n    double x = Math.pow(point.x \/ dm.xdpi, 2); \/\/dm.xdpi\u662f\u5c4f\u5e55x\u65b9\u5411\u7684\u771f\u5b9e\u5bc6\u5ea6\u503c\uff0c\u6bd4\u4e0a\u9762\u7684densityDpi\u771f\u5b9e\n    double y = Math.pow(point.y \/ dm.ydpi, 2); \/\/dm.xdpi\u662f\u5c4f\u5e55y\u65b9\u5411\u7684\u771f\u5b9e\u5bc6\u5ea6\u503c\uff0c\u6bd4\u4e0a\u9762\u7684densityDpi\u771f\u5b9e\n    double screenInches = Math.sqrt(x + y);\n    return screenInches;\n}\n\nprivate double getScreenXInches(Context context) {\n    WindowManager manager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);\n    Point point = new Point();\n    manager.getDefaultDisplay().getRealSize(point);\n    DisplayMetrics dm = context.getResources().getDisplayMetrics();\n    int densityDpi = dm.densityDpi; \/\/\u5f97\u5230\u5c4f\u5e55\u7684\u5bc6\u5ea6\u503c\uff0c\u4f46\u662f\u8be5\u5bc6\u5ea6\u503c\u53ea\u80fd\u4f5c\u4e3a\u53c2\u8003\uff0c\u56e0\u4e3a\u4ed6\u662f\u56fa\u5b9a\u7684\u51e0\u4e2a\u5bc6\u5ea6\u503c\u3002\n    double x = point.x \/ dm.xdpi; \/\/dm.xdpi\u662f\u5c4f\u5e55x\u65b9\u5411\u7684\u771f\u5b9e\u5bc6\u5ea6\u503c\uff0c\u6bd4\u4e0a\u9762\u7684densityDpi\u771f\u5b9e\u3002\n    return  x;\n}\n\nprivate double getScreenYInches(Context context) {\n    WindowManager manager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);\n    Point point = new Point();\n    manager.getDefaultDisplay().getRealSize(point);\n    DisplayMetrics dm = context.getResources().getDisplayMetrics();\n    int densityDpi = dm.densityDpi; \/\/\u5f97\u5230\u5c4f\u5e55\u7684\u5bc6\u5ea6\u503c\uff0c\u4f46\u662f\u8be5\u5bc6\u5ea6\u503c\u53ea\u80fd\u4f5c\u4e3a\u53c2\u8003\uff0c\u56e0\u4e3a\u4ed6\u662f\u56fa\u5b9a\u7684\u51e0\u4e2a\u5bc6\u5ea6\u503c\u3002\n    double y = point.y \/ dm.ydpi; \/\/dm.ydpi\u662f\u5c4f\u5e55y\u65b9\u5411\u7684\u771f\u5b9e\u5bc6\u5ea6\u503c\uff0c\u6bd4\u4e0a\u9762\u7684densityDpi\u771f\u5b9e\u3002\n    return  y;\n}<\/code><\/pre>\n<p>\u6ce8\u610f\uff1a\u6b64\u5904displayMetrics\u4e0d\u8981\u4f7f\u7528context.getApplicationContext().getResources().getDisplayMetrics()\u6765\u83b7\u53d6\u3002<br \/>\n\u4e0a\u9762\u8bf4\u5230\uff0cDPI\u662f\u7531\u8bbe\u5907\u51fa\u5382\u65f6\u5199\u6b7b\u5230\u8bbe\u5907\u91cc\u7684\uff0c\u5982\u679c\u5199\u5165\u7684DPI\u503c\u4e0d\u51c6\u786e\uff0c\u5f53\u7136\u8ba1\u7b97\u4e0d\u51fa\u51c6\u786e\u7684\u5c4f\u5e55\u5c3a\u5bf8\u3002\u8fd9\u4e5f\u662f\u53cb\u76df\u7edf\u8ba1\u91cc\u6ca1\u6709\u5c4f\u5e55\u5c3a\u5bf8\u8fd9\u4e00\u9879\u7684\u539f\u56e0\u5427\uff0c\u6240\u4ee5\u8ba1\u7b97\u51fa\u7684\u5c4f\u5e55\u5c3a\u5bf8\u53ea\u505a\u53c2\u8003\u3002<\/p>\n<h2>\u5c4f\u5e55\u5398\u7c73\u503c<\/h2>\n<pre><code class=\"language-java\">mScreenInches = getScreenInches(this);\nmScreenXInches = getScreenXInches(this);\nLog.i(TAG, &quot;mScreenInches: &quot; + mScreenInches + &quot;, mScreenXInches: &quot; + mScreenXInches);\n\/\/\u5c4f\u5e55\u5398\u7c73\u503c: 1\u82f1\u5bf8(in)=2.54\u5398\u7c73(cm)\nmScreenXCm = mScreenXInches * 2.5399999961392;\nLog.i(TAG, &quot;mScreenXCm: &quot; + mScreenXCm);\n\/\/\u6bcf\u5398\u7c73\u5305\u542b\u591a\u5c11\u50cf\u7d20\nmScreenPixelPerCm = (int) (ScreenUtil.getScreenWidth(this) \/ mScreenXCm);\nLog.i(TAG, &quot;mScreenPixelPerCm: &quot; + mScreenPixelPerCm);<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u5c4f\u5e55\u82f1\u5bf8\u503c \u8ba1\u7b97\u65b9\u6cd5\uff1a\u83b7\u53d6\u5230\u5c4f\u5e55\u7684\u5206\u8fa8\u7387point.x\u548cpoint.y\uff0c\u518d\u53d6\u51fa\u5c4f\u5e55\u7684DPI\uff08\u6bcf\u82f1\u5bf8\u7684\u50cf\u7d20\u6570\u91cf\uff09 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[61],"tags":[],"class_list":["post-747","post","type-post","status-publish","format-standard","hentry","category-android-basic"],"_links":{"self":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/747","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/comments?post=747"}],"version-history":[{"count":0,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/747\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/media?parent=747"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/categories?post=747"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/tags?post=747"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}