小红书水印去除技术实现详解<\/h1>

一、技术背景<\/h2>
小红书作为流行的社交平台，会在用户分享的图片上添加水印（文字或Logo）。本文详细讲解如何通过Frida脚本和Xposed模块实现小红书水印的去除。<\/p>

二、水印实现方式分析<\/h2>

通过逆向分析，小红书主要使用以下三种方式添加水印：<\/p>

Bitmap.compress<\/strong> - 用于保存图片到磁盘时添加水印<\/li>
Canvas.drawText<\/strong> - 添加文字水印（如"小红书"、"xhs"等）<\/li>

Canvas.drawBitmap<\/strong> - 添加图像Logo水印<\/li> <\/ol>
三、Frida脚本实现<\/h2>
1. 去除文字水印<\/h3>
通过Hook Canvas.drawText<\/code>方法，检测并替换包含特定关键词的文字内容：<\/p>
Canvas<\/span>.drawText<\/span>.overload<\/span>( <\/span><\/span> "java.lang.String"<\/span>, <\/span><\/span> "float"<\/span>, <\/span><\/span> "float"<\/span>, <\/span><\/span> "android.graphics.Paint"<\/span> <\/span><\/span>).implementation<\/span> =<\/span> function<\/span>(text<\/span>, x<\/span>, y<\/span>, paint<\/span>) { <\/span><\/span> if<\/span> (text<\/span>.toLowerCase<\/span>().includes<\/span>("小红书"<\/span>) ||<\/span> <\/span><\/span> text<\/span>.toLowerCase<\/span>().includes<\/span>("xhs"<\/span>)) { <\/span><\/span> return<\/span> this<\/span>.drawText<\/span>(''<\/span>, x<\/span>, y<\/span>, paint<\/span>); <\/span><\/span> } <\/span><\/span> return<\/span> this<\/span>.drawText<\/span>(text<\/span>, x<\/span>, y<\/span>, paint<\/span>); <\/span><\/span>} <\/span><\/span><\/code><\/pre>关键点：<\/strong><\/p> 使用overload<\/code>指定参数类型确保Hook正确方法<\/li> 检测文本内容是否包含"小红书"或"xhs"（不区分大小写）<\/li> 替换为空白字符串实现去水印效果<\/li> <\/ul> 2. 去除图片Logo水印<\/h3> 通过Hook Canvas.drawBitmap<\/code>方法，检测Bitmap尺寸判断是否为水印：<\/p> Canvas<\/span>.drawBitmap<\/span>.overload<\/span>( <\/span><\/span> "android.graphics.Bitmap"<\/span>, <\/span><\/span> "android.graphics.Rect"<\/span>, <\/span><\/span> "android.graphics.Rect"<\/span>, <\/span><\/span> "android.graphics.Paint"<\/span> <\/span><\/span>).implementation<\/span> =<\/span> function<\/span>(bitmap<\/span>, src<\/span>, dst<\/span>, paint<\/span>) { <\/span><\/span> if<\/span> (bitmap<\/span>.getWidth<\/span>() <<\/span> 400<\/span> &&<\/span> bitmap<\/span>.getHeight<\/span>() <<\/span> 150<\/span>) { <\/span><\/span> \/\/ 创建透明Bitmap替换水印 <\/span><\/span><\/span><\/span> var<\/span> transparent<\/span> =<\/span> Bitmap<\/span>.createBitmap<\/span>( <\/span><\/span> bitmap<\/span>.getWidth<\/span>(), <\/span><\/span> bitmap<\/span>.getHeight<\/span>(), <\/span><\/span> Bitmap<\/span>.Config<\/span>.ARGB_8888<\/span> <\/span><\/span> ); <\/span><\/span> return<\/span> this<\/span>.drawBitmap<\/span>(transparent<\/span>, src<\/span>, dst<\/span>, paint<\/span>); <\/span><\/span> } <\/span><\/span> return<\/span> this<\/span>.drawBitmap<\/span>(bitmap<\/span>, src<\/span>, dst<\/span>, paint<\/span>); <\/span><\/span>} <\/span><\/span><\/code><\/pre>关键点：<\/strong><\/p> 水印Logo通常尺寸较小（宽<400px，高<150px）<\/li> 创建透明Bitmap替换原水印Bitmap<\/li> 使用ARGB_8888配置确保透明效果<\/li> <\/ul> 四、Xposed模块实现<\/h2> 将Frida脚本转换为持久化的Xposed模块：<\/p> 1. 文字水印处理<\/h3> private<\/span> void<\/span> hookCanvasDrawText<\/span>()<\/span> {<\/span> <\/span><\/span> for<\/span> (<\/span>Method method :<\/span> Canvas.<\/span>class<\/span>.<\/span>getDeclaredMethods<\/span>())<\/span> {<\/span> <\/span><\/span> if<\/span> (<\/span>method.<\/span>getName<\/span>().<\/span>equals<\/span>(<\/span>"drawText"<\/span>)<\/span> &&<\/span> <\/span><\/span> method.<\/span>getParameterTypes<\/span>().<\/span>length<\/span> ==<\/span> 4<\/span>)<\/span> {<\/span> <\/span><\/span> XposedBridge.<\/span>hookMethod<\/span>(<\/span>method,<\/span> new<\/span> XC_MethodHook()<\/span> {<\/span> <\/span><\/span> @Override<\/span> <\/span><\/span> protected<\/span> void<\/span> beforeHookedMethod<\/span>(<\/span>MethodHookParam param)<\/span> {<\/span> <\/span><\/span> String text =<\/span> (<\/span>String)<\/span> param.<\/span>args<\/span>[<\/span>0<\/span>];<\/span> <\/span><\/span> if<\/span> (<\/span>text !=<\/span> null<\/span> &&<\/span> <\/span><\/span> (<\/span>text.<\/span>toLowerCase<\/span>().<\/span>contains<\/span>(<\/span>"小红书"<\/span>)<\/span> ||<\/span> <\/span><\/span> text.<\/span>toLowerCase<\/span>().<\/span>contains<\/span>(<\/span>"xhs"<\/span>)))<\/span> {<\/span> <\/span><\/span> param.<\/span>args<\/span>[<\/span>0<\/span>]<\/span> =<\/span> ""<\/span>;<\/span> <\/span><\/span> }<\/span> <\/span><\/span> }<\/span> <\/span><\/span> });<\/span> <\/span><\/span> }<\/span> <\/span><\/span> }<\/span> <\/span><\/span>}<\/span> <\/span><\/span><\/code><\/pre>2. 图片水印处理<\/h3> private<\/span> void<\/span> hookCanvasDrawBitmap<\/span>()<\/span> {<\/span> <\/span><\/span> for<\/span> (<\/span>Method method :<\/span> Canvas.<\/span>class<\/span>.<\/span>getDeclaredMethods<\/span>())<\/span> {<\/span> <\/span><\/span> if<\/span> (<\/span>method.<\/span>getName<\/span>().<\/span>equals<\/span>(<\/span>"drawBitmap"<\/span>)<\/span> &&<\/span> <\/span><\/span> method.<\/span>getParameterTypes<\/span>().<\/span>length<\/span> ==<\/span> 4<\/span>)<\/span> {<\/span> <\/span><\/span> XposedBridge.<\/span>hookMethod<\/span>(<\/span>method,<\/span> new<\/span> XC_MethodHook()<\/span> {<\/span> <\/span><\/span> @Override<\/span> <\/span><\/span> protected<\/span> void<\/span> beforeHookedMethod<\/span>(<\/span>MethodHookParam param)<\/span> {<\/span> <\/span><\/span> Bitmap bmp =<\/span> (<\/span>Bitmap)<\/span> param.<\/span>args<\/span>[<\/span>0<\/span>];<\/span> <\/span><\/span> if<\/span> (<\/span>bmp.<\/span>getWidth<\/span>()<\/span> <<\/span> 400<\/span> &&<\/span> bmp.<\/span>getHeight<\/span>()<\/span> <<\/span> 150<\/span>)<\/span> {<\/span> <\/span><\/span> Bitmap transparent =<\/span> Bitmap.<\/span>createBitmap<\/span>(<\/span> <\/span><\/span> bmp.<\/span>getWidth<\/span>(),<\/span> <\/span><\/span> bmp.<\/span>getHeight<\/span>(),<\/span> <\/span><\/span> Bitmap.<\/span>Config<\/span>.<\/span>ARGB_8888<\/span> <\/span><\/span> );<\/span> <\/span><\/span> param.<\/span>args<\/span>[<\/span>0<\/span>]<\/span> =<\/span> transparent;<\/span> <\/span><\/span> }<\/span> <\/span><\/span> }<\/span> <\/span><\/span> });<\/span> <\/span><\/span> }<\/span> <\/span><\/span> }<\/span> <\/span><\/span>}<\/span> <\/span><\/span><\/code><\/pre>Xposed模块关键点：<\/strong><\/p> 通过反射获取Canvas类的所有方法<\/li> 根据方法名和参数数量筛选目标方法<\/li> 在beforeHookedMethod<\/code>中修改参数实现水印去除<\/li> 模块需要声明Xposed相关配置（未在原文中展示）<\/li> <\/ul> 五、实现注意事项<\/h2> 兼容性问题<\/strong>：<\/p> 不同版本的小红书可能使用不同的水印实现方式<\/li> 需要根据实际情况调整尺寸判断阈值<\/li> <\/ul> <\/li> 性能考虑<\/strong>：<\/p> Bitmap操作较耗资源，应避免频繁创建Bitmap<\/li> 精确判断条件减少不必要的Hook处理<\/li> <\/ul> <\/li> 检测规避<\/strong>：<\/p> 小红书可能有反Hook机制，需考虑隐藏Xposed痕迹<\/li> 可结合其他技术（如Magisk Hide）增强隐蔽性<\/li> <\/ul> <\/li> <\/ol> 六、完整资源<\/h2> 完整代码和模块下载地址： https:\/\/github.com\/SimpsonGet\/XhsWatermarkRemove<\/a><\/p> 七、法律与道德提示<\/h2> 本技术文档仅用于学习Android逆向技术和安全研究目的。实际应用中请遵守相关法律法规和平台用户协议，尊重知识产权。<\/p>

小红书水印去除技术实现详解<\/h1>

一、技术背景<\/h2> 小红书作为流行的社交平台，会在用户分享的图片上添加水印（文字或Logo）。本文详细讲解如何通过Frida脚本和Xposed模块实现小红书水印的去除。<\/p>

三、Frida脚本实现<\/h2>

四、Xposed模块实现<\/h2> 将Frida脚本转换为持久化的Xposed模块：<\/p>

六、完整资源<\/h2> 完整代码和模块下载地址： https:\/\/github.com\/SimpsonGet\/XhsWatermarkRemove<\/a><\/p>

七、法律与道德提示<\/h2> 本技术文档仅用于学习Android逆向技术和安全研究目的。实际应用中请遵守相关法律法规和平台用户协议，尊重知识产权。<\/p>

一、技术背景<\/h2>
小红书作为流行的社交平台，会在用户分享的图片上添加水印（文字或Logo）。本文详细讲解如何通过Frida脚本和Xposed模块实现小红书水印的去除。<\/p>

四、Xposed模块实现<\/h2>
将Frida脚本转换为持久化的Xposed模块：<\/p>

六、完整资源<\/h2>
完整代码和模块下载地址：
https:\/\/github.com\/SimpsonGet\/XhsWatermarkRemove<\/a><\/p>

七、法律与道德提示<\/h2>
本技术文档仅用于学习Android逆向技术和安全研究目的。实际应用中请遵守相关法律法规和平台用户协议，尊重知识产权。<\/p>