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"),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[t._v("1")]),s("br"),s("span",{staticClass:"line-number"},[t._v("2")]),s("br"),s("span",{staticClass:"line-number"},[t._v("3")]),s("br"),s("span",{staticClass:"line-number"},[t._v("4")]),s("br"),s("span",{staticClass:"line-number"},[t._v("5")]),s("br"),s("span",{staticClass:"line-number"},[t._v("6")]),s("br"),s("span",{staticClass:"line-number"},[t._v("7")]),s("br"),s("span",{staticClass:"line-number"},[t._v("8")]),s("br"),s("span",{staticClass:"line-number"},[t._v("9")]),s("br"),s("span",{staticClass:"line-number"},[t._v("10")]),s("br"),s("span",{staticClass:"line-number"},[t._v("11")]),s("br"),s("span",{staticClass:"line-number"},[t._v("12")]),s("br"),s("span",{staticClass:"line-number"},[t._v("13")]),s("br"),s("span",{staticClass:"line-number"},[t._v("14")]),s("br"),s("span",{staticClass:"line-number"},[t._v("15")]),s("br"),s("span",{staticClass:"line-number"},[t._v("16")]),s("br"),s("span",{staticClass:"line-number"},[t._v("17")]),s("br"),s("span",{staticClass:"line-number"},[t._v("18")]),s("br"),s("span",{staticClass:"line-number"},[t._v("19")]),s("br"),s("span",{staticClass:"line-number"},[t._v("20")]),s("br"),s("span",{staticClass:"line-number"},[t._v("21")]),s("br"),s("span",{staticClass:"line-number"},[t._v("22")]),s("br"),s("span",{staticClass:"line-number"},[t._v("23")]),s("br"),s("span",{staticClass:"line-number"},[t._v("24")]),s("br")])]),s("h3",{attrs:{id:"_3-使用bitmapfactory-options进行解码"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#_3-使用bitmapfactory-options进行解码"}},[t._v("#")]),t._v(" 3. 使用BitmapFactory.Options进行解码")]),t._v(" "),s("p",[t._v("通过设置BitmapFactory.Options来控制解码过程中的内存使用。")]),t._v(" "),s("div",{staticClass:"language-java line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-java"}},[s("code",[s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("BitmapFactory"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("Options")]),t._v(" options "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("new")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("BitmapFactory"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("Options")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\noptions"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("inPurgeable 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"),s("div",{staticClass:"line-numbers-wrapper"},[s("span",{staticClass:"line-number"},[t._v("1")]),s("br"),s("span",{staticClass:"line-number"},[t._v("2")]),s("br"),s("span",{staticClass:"line-number"},[t._v("3")]),s("br"),s("span",{staticClass:"line-number"},[t._v("4")]),s("br")])]),s("h3",{attrs:{id:"_4-回收bitmap内存"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#_4-回收bitmap内存"}},[t._v("#")]),t._v(" 4. 回收Bitmap内存")]),t._v(" "),s("p",[t._v("在不再需要Bitmap时，及时调用bitmap.recycle()方法释放内存。")]),t._v(" "),s("div",{staticClass:"language-java line-numbers-mode"},[s("pre",{pre:!0,attrs:{class:"language-java"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("if")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("bitmap "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("null")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" 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\ No newline at end of file
diff --git a/assets/js/174.374b8ab4.js b/assets/js/174.374b8ab4.js
new file mode 100644
index 0000000000..2cc491f76d
--- /dev/null
+++ b/assets/js/174.374b8ab4.js
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diff --git a/assets/js/175.096a945e.js b/assets/js/175.096a945e.js
new file mode 100644
index 0000000000..128556b649
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diff --git a/assets/js/183.52a67e98.js b/assets/js/183.52a67e98.js
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diff --git a/assets/js/186.fff99cfa.js b/assets/js/186.fff99cfa.js
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+(window.webpackJsonp=window.webpackJsonp||[]).push([[190],{506:function(_,v,t){"use strict";t.r(v);var e=t(4),l=Object(e.a)({},(function(){var _=this,v=_._self._c;return v("ContentSlotsDistributor",{attrs:{"slot-key":_.$parent.slotKey}},[v("blockquote",[v("p",[_._v("本方法使用灰度值来辨别白屏")])]),_._v(" "),v("p",[_._v("白色的RGB值为(255, 255, 255), 在灰度转换的情况下, 根据给定的转换公式 "),v("code",[_._v("Gray = (Rx4 + Gx10 + Bx2) >> 8")]),_._v(", 计算得到的灰度值为: "),v("code",[_._v("Gray=(255x4+255x10+255x2)>>8=(1020+2550+510)>>8=4080>>8=15")])]),_._v(" "),v("h2",{attrs:{id:"方案"}},[v("a",{staticClass:"header-anchor",attrs:{href:"#方案"}},[_._v("#")]),_._v(" 方案")]),_._v(" "),v("ul",[v("li",[_._v("根据(x,y,w,h)取出指定区域的图像")]),_._v(" "),v("li",[_._v("将图片每个像素点的(R,G,B)转换为灰度值(0-15), 转换公式如下:\n"),v("code",[_._v("Gray = (Rx4 + Gx10 + Bx2) >> 8")])]),_._v(" "),v("li",[_._v("统计Gray的分布情况, 把各个灰度值的情况上报")]),_._v(" "),v("li",[_._v("为了避免过多上报, 我们会先计算一下白色的占比, 计算公式如下:\n"),v("code",[_._v("whiteRate = GrayArr[15] / TotalPixels")])]),_._v(" "),v("li",[_._v("当whiteRate大于0.9 (配置中心可配web.white_rate_threshold)我们才会上报")]),_._v(" "),v("li",[_._v("我们只能截屏幕可见区域的指定部分, 如果用户有滚动, 那么截取的可能就不是首屏的内容了")])]),_._v(" "),v("h2",{attrs:{id:"检测原理"}},[v("a",{staticClass:"header-anchor",attrs:{href:"#检测原理"}},[_._v("#")]),_._v(" 检测原理")]),_._v(" "),v("p",[_._v("这个白屏检测的原理基于对截取图像的灰度分布进行分析。具体步骤如下:")]),_._v(" "),v("ul",[v("li",[_._v("截取指定区域的图像: 根据给定的区域参数(x,y,w,h), 从屏幕截取指定位置的图像。")]),_._v(" "),v("li",[_._v("将图片每个像素点的(R,G,B)转换为灰度值: 对截取的图像进行灰度转换。"),v("RText",{attrs:{text:"灰度值是图像亮度的表示, 用一个数值表示整个像素的明暗程度"}}),_._v("。根据给定的转换公式 "),v("code",[_._v("Gray = (Rx4 + Gx10 + Bx2) >> 8")]),_._v(", 计算每个像素点的灰度值, 范围为0到15。")],1),_._v(" "),v("li",[_._v("统计灰度值的分布情况: 统计转换后的灰度值的分布情况, 得到每个灰度值出现的次数或比例。")]),_._v(" "),v("li",[_._v("计算白色占比: 根据灰度值的分布情况, 计算白色(灰度值为15)的占比, 即白色像素点在总像素点中的比例。")]),_._v(" "),v("li",[_._v("白屏检测: 当白色占比大于设定的阈值(例如0.9), 即白色像素点占据了大部分图像区域, 认为截取到的内容可能是白屏。")])]),_._v(" "),v("p",[_._v("这种方法的原理是基于白屏通常是整个屏幕大部分区域都是白色的特点。通过分析截取图像的灰度分布情况, 尤其是白色(灰度值最高)的占比, 可以判断当前页面是否呈现出白屏状态。这种方法可以有效避免截取到无效的白屏内容, 并且节省了上报的资源开销。")]),_._v(" "),v("h3",{attrs:{id:"灰度图像公式"}},[v("a",{staticClass:"header-anchor",attrs:{href:"#灰度图像公式"}},[_._v("#")]),_._v(" 灰度图像公式")]),_._v(" "),v("p",[v("code",[_._v("Gray = (Rx4 + Gx10 + Bx2) >> 8")]),_._v(" 是一个用于将彩色图像转换为灰度图像的公式。这个公式通过计算 RGB 三个通道的加权和来得到灰度值，其中绿色通道的权重较大，表明绿色对灰度值的影响最大。")]),_._v(" "),v("p",[_._v("让我们详细分析一下：")]),_._v(" "),v("RText",{attrs:{text:"公式含义："}}),_._v(" "),v("ul",[v("li",[_._v("R：表示红色通道的值。")]),_._v(" "),v("li",[_._v("G：表示绿色通道的值。")]),_._v(" "),v("li",[_._v("B：表示蓝色通道的值。")]),_._v(" "),v("li",[_._v("Gray：表示最终的灰度值。")]),_._v(" "),v("li",[v("code",[_._v(">> 8")]),_._v("：表示右移 8 位，相当于除以 256。")])]),_._v(" "),v("RText",{attrs:{text:"加权平均："}}),_._v(" "),v("p",[_._v("这个公式将红色、绿色、蓝色三个通道的值按照不同的权重加在一起：")]),_._v(" "),v("ul",[v("li",[_._v("红色的权重是 4。")]),_._v(" "),v("li",[_._v("绿色的权重是 10，比其他两个通道更高，反映了人眼对绿色更为敏感。")]),_._v(" "),v("li",[_._v("蓝色的权重是 2，相对较低。")])]),_._v(" "),v("p",[_._v("将它们加权后除以 256 来得到一个 0 到 15 的灰度值。")]),_._v(" "),v("RText",{attrs:{text:"具体步骤："}}),_._v(" "),v("ul",[v("li",[_._v("计算加权值："),v("code",[_._v("Rx4 + Gx10 + Bx2")]),_._v("。")]),_._v(" "),v("li",[_._v("红色的贡献是 "),v("code",[_._v("Rx4")])]),_._v(" "),v("li",[_._v("绿色的贡献是 "),v("code",[_._v("Gx10")])]),_._v(" "),v("li",[_._v("蓝色的贡献是 "),v("code",[_._v("Bx2")])]),_._v(" "),v("li",[_._v("右移 8 位："),v("code",[_._v(">> 8")]),_._v("，即将计算结果除以 256。右移操作可以快速实现这种整数除法。")])]),_._v(" "),v("RText",{attrs:{text:"理由："}}),_._v(" "),v("p",[_._v("使用加权平均是因为人眼对不同颜色的敏感度不同，通常对绿色最敏感，对红色次之，对蓝色最不敏感。这个公式中赋予了绿色较大的权重(10)，而红色和蓝色的权重较小(4 和 2)。")]),_._v(" "),v("RText",{attrs:{text:"总结："}}),_._v(" "),v("ul",[v("li",[_._v("红色、绿色 和 蓝色通道按照不同的权重加在一起，计算得到灰度值。")]),_._v(" "),v("li",[_._v("绿色的权重较高，符合人眼的感知特性。")]),_._v(" "),v("li",[_._v("通过位移操作快速实现除法来缩放结果到 0-255 范围内。")])])],1)}),[],!1,null,null,null);v.default=l.exports}}]);
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diff --git a/assets/js/191.e442adbb.js b/assets/js/191.e442adbb.js
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+++ b/assets/js/191.e442adbb.js
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+(window.webpackJsonp=window.webpackJsonp||[]).push([[191],{507:function(t,a,s){"use strict";s.r(a);var n=s(4),e=Object(n.a)({},(function(){var t=this,a=t._self._c;return a("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[a("h2",{attrs:{id:"getidentifier"}},[a("a",{staticClass:"header-anchor",attrs:{href:"#getidentifier"}},[t._v("#")]),t._v(" getIdentifier")]),t._v(" "),a("div",{staticClass:"language-java line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-java"}},[a("code",[t._v("val layoutID"),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v("resources"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("getIdentifier")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"activity_main"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"layout"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v("packageName"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("setContentView")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("layoutID"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n"),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("setContentView")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token class-name"}},[t._v("R")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("layout"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("activity_main"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])]),t._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[t._v("1")]),a("br"),a("span",{staticClass:"line-number"},[t._v("2")]),a("br"),a("span",{staticClass:"line-number"},[t._v("3")]),a("br"),a("span",{staticClass:"line-number"},[t._v("4")]),a("br")])]),a("blockquote",[a("p",[t._v("这两种形式在功能上都是设置一个活动(Activity)的布局(layout)，但它们在实现和使用场景上有一些区别。")])]),t._v(" "),a("p",[t._v("A. 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"),a("code",[t._v("setContentView(layoutID)")]),t._v(": 这种方式首先通过 resources.getIdentifier 方法在运行时动态获取资源 ID，然后再将其设置为内容视图。具体实现如下:")]),t._v(" "),a("div",{staticClass:"language-java line-numbers-mode"},[a("pre",{pre:!0,attrs:{class:"language-java"}},[a("code",[t._v("val layoutID "),a("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" resources"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("getIdentifier")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"activity_main"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),a("span",{pre:!0,attrs:{class:"token string"}},[t._v('"layout"')]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" packageName"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n"),a("span",{pre:!0,attrs:{class:"token function"}},[t._v("setContentView")]),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("layoutID"),a("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n")])]),t._v(" "),a("div",{staticClass:"line-numbers-wrapper"},[a("span",{staticClass:"line-number"},[t._v("1")]),a("br"),a("span",{staticClass:"line-number"},[t._v("2")]),a("br")])]),a("RText",{attrs:{text:"使用场景"}}),t._v(" "),a("ol",[a("li",[t._v("动态资源加载:")])]),t._v(" "),a("ul",[a("li",[t._v("多布局支持: 如果你的应用需要在运行时根据某些条件(例如设备类型、用户设置、语言环境等)动态选择布局文件，可以使用这种方法。例如，可以根据屏幕尺寸加载不同的布局文件。")]),t._v(" "),a("li",[t._v("模块化资源: 在一些复杂项目中，布局文件可能会被动态地添加或移除。在这种情况下，使用字符串资源名称可以提供更灵活的资源管理方式。")])]),t._v(" "),a("ol",{attrs:{start:"2"}},[a("li",[t._v("国际化和本地化:")])]),t._v(" "),a("ul",[a("li",[t._v("多语言支持: 通过 getIdentifier，可以更方便地在代码中处理不同语言环境下的资源。例如，不同语言环境可能有不同的布局文件命名。")])]),t._v(" "),a("ol",{attrs:{start:"3"}},[a("li",[t._v("插件化和动态更新:")])]),t._v(" "),a("ul",[a("li",[t._v("插件系统: 如果你的应用有插件系统，并且插件的布局文件是动态加载的，那么可以使用这种方法来动态解析和加载插件资源。")]),t._v(" "),a("li",[t._v("热更新: 对于需要从服务器动态获取并加载布局文件的应用，可以在下载新的布局文件后，通过资源名称动态获取其 ID 并设置内容视图。")])]),t._v(" "),a("RText",{attrs:{text:"注意事项:"}}),t._v(" "),a("ul",[a("li",[t._v("性能:resources.getIdentifier 是一个相对耗时的操作，因为它是在运行时解析资源 ID。对于频繁调用的场景，要注意性能开销。")]),t._v(" "),a("li",[t._v("安全性: 动态获取资源 ID 的方式可能会因为资源名称拼写错误或者资源不存在而导致 layoutID 返回 0，从而引发 NullPointerException 或其他错误。因此，需要添加适当的错误处理。")]),t._v(" "),a("li",[t._v("代码可读性: 这种方式的代码可读性较低，维护起来可能不如直接使用 R.layout.activity_main 方便。")])])],1)}),[],!1,null,null,null);a.default=e.exports}}]);
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diff --git a/assets/js/192.1d52114b.js b/assets/js/192.1d52114b.js
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