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class="sidebar-item-children"><!--[--><li><a aria-current="page" href="/KavaRef/zh-cn/library/kavaref-extension.html#配置依赖" class="router-link-active router-link-exact-active sidebar-item" aria-label="配置依赖"><!--[--><!--]--> 配置依赖 <!--[--><!--]--></a><ul style="" class="sidebar-item-children"><!--[--><li><a aria-current="page" href="/KavaRef/zh-cn/library/kavaref-extension.html#sweetdependency-推荐" class="router-link-active router-link-exact-active sidebar-item" aria-label="SweetDependency (推荐)"><!--[--><!--]--> SweetDependency (推荐) <!--[--><!--]--></a><!----></li><li><a aria-current="page" href="/KavaRef/zh-cn/library/kavaref-extension.html#version-catalog" class="router-link-active router-link-exact-active sidebar-item" aria-label="Version Catalog"><!--[--><!--]--> Version Catalog <!--[--><!--]--></a><!----></li><li><a aria-current="page" href="/KavaRef/zh-cn/library/kavaref-extension.html#传统方式" class="router-link-active router-link-exact-active sidebar-item" aria-label="传统方式"><!--[--><!--]--> 传统方式 <!--[--><!--]--></a><!----></li><!--]--></ul></li><li><a aria-current="page" href="/KavaRef/zh-cn/library/kavaref-extension.html#功能介绍" class="router-link-active router-link-exact-active sidebar-item" aria-label="功能介绍"><!--[--><!--]--> 功能介绍 <!--[--><!--]--></a><ul style="" class="sidebar-item-children"><!--[--><li><a aria-current="page" href="/KavaRef/zh-cn/library/kavaref-extension.html#class-扩展" class="router-link-active router-link-exact-active sidebar-item" aria-label="Class 扩展"><!--[--><!--]--> Class 扩展 <!--[--><!--]--></a><!----></li><li><a aria-current="page" href="/KavaRef/zh-cn/library/kavaref-extension.html#数组-class-扩展" class="router-link-active router-link-exact-active sidebar-item" aria-label="数组 Class 扩展"><!--[--><!--]--> 数组 Class 扩展 <!--[--><!--]--></a><!----></li><li><a aria-current="page" href="/KavaRef/zh-cn/library/kavaref-extension.html#member-扩展" class="router-link-active router-link-exact-active sidebar-item" aria-label="Member 扩展"><!--[--><!--]--> Member 扩展 <!--[--><!--]--></a><!----></li><li><a aria-current="page" href="/KavaRef/zh-cn/library/kavaref-extension.html#type-扩展" class="router-link-active router-link-exact-active sidebar-item" aria-label="Type 扩展"><!--[--><!--]--> Type 扩展 <!--[--><!--]--></a><!----></li><li><a aria-current="page" href="/KavaRef/zh-cn/library/kavaref-extension.html#java-包装类扩展" class="router-link-active router-link-exact-active sidebar-item" aria-label="Java 包装类扩展"><!--[--><!--]--> Java 包装类扩展 <!--[--><!--]--></a><!----></li><!--]--></ul></li><!--]--></ul></li><!--]--></ul></li><li><p tabindex="0" class="sidebar-item sidebar-heading collapsible">配置 <span class="right arrow"></span></p><ul style="display:none;" class="sidebar-item-children"><!--[--><li><a href="/KavaRef/zh-cn/config/r8-proguard.html" class="sidebar-item" aria-label="R8 与 Proguard 混淆"><!--[--><!--]--> R8 与 Proguard 混淆 <!--[--><!--]--></a><!----></li><li><a href="/KavaRef/zh-cn/config/processor-resolvers.html" class="sidebar-item" aria-label="第三方 Member 解析器"><!--[--><!--]--> 第三方 Member 解析器 <!--[--><!--]--></a><!----></li><li><a href="/KavaRef/zh-cn/config/migration.html" class="sidebar-item" aria-label="迁移至 KavaRef"><!--[--><!--]--> 迁移至 KavaRef <!--[--><!--]--></a><!----></li><!--]--></ul></li><li><p tabindex="0" class="sidebar-item sidebar-heading collapsible">关于 <span class="right arrow"></span></p><ul style="display:none;" class="sidebar-item-children"><!--[--><li><a href="/KavaRef/zh-cn/about/changelog.html" class="sidebar-item" aria-label="更新日志"><!--[--><!--]--> 更新日志 <!--[--><!--]--></a><!----></li><li><a href="/KavaRef/zh-cn/about/future.html" class="sidebar-item" aria-label="展望未来"><!--[--><!--]--> 展望未来 <!--[--><!--]--></a><!----></li><li><a href="/KavaRef/zh-cn/about/contacts.html" class="sidebar-item" aria-label="联系我们"><!--[--><!--]--> 联系我们 <!--[--><!--]--></a><!----></li><li><a href="/KavaRef/zh-cn/about/about.html" class="sidebar-item" aria-label="关于此文档"><!--[--><!--]--> 关于此文档 <!--[--><!--]--></a><!----></li><!--]--></ul></li><!--]--></ul><!--[--><!--]--></aside><!--]--><!--[--><main class="page"><!--[--><!--]--><div class="theme-default-content"><!--[--><!--]--><div><h1 id="kavaref-extension" tabindex="-1"><a class="header-anchor" href="#kavaref-extension" aria-hidden="true">#</a> kavaref-extension</h1><p><img src="https://img.shields.io/maven-central/v/com.highcapable.kavaref/kavaref-extension?logo=apachemaven&logoColor=orange&style=flat-square" alt="Maven Central"><span style="margin-left:5px;"></span><img src="https://img.shields.io/maven-metadata/v?metadataUrl=https%3A%2F%2Fraw.githubusercontent.com%2FHighCapable%2Fmaven-repository%2Frefs%2Fheads%2Fmain%2Frepository%2Freleases%2Fcom%2Fhighcapable%2Fkavaref%2Fkavaref-extension%2Fmaven-metadata.xml&logo=apachemaven&logoColor=orange&label=highcapable-maven-releases&style=flat-square" alt="Maven metadata URL"></p><p>这是 KavaRef 相关功能的扩展依赖。</p><h2 id="配置依赖" tabindex="-1"><a class="header-anchor" href="#配置依赖" aria-hidden="true">#</a> 配置依赖</h2><p>你可以使用如下方式将此模块添加到你的项目中。</p><h3 id="sweetdependency-推荐" tabindex="-1"><a class="header-anchor" href="#sweetdependency-推荐" aria-hidden="true">#</a> SweetDependency (推荐)</h3><p>在你的项目 <code>SweetDependency</code> 配置文件中添加依赖。</p><div class="language-yaml line-numbers-mode" data-ext="yml"><pre class="shiki github-dark-dimmed" style="background-color:#22272e;" tabindex="0"><code><span class="line"><span style="color:#8DDB8C;">libraries</span><span style="color:#ADBAC7;">:</span></span>
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||
<span class="line"><span style="color:#ADBAC7;"> </span><span style="color:#8DDB8C;">com.highcapable.kavaref</span><span style="color:#ADBAC7;">:</span></span>
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||
<span class="line"><span style="color:#ADBAC7;"> </span><span style="color:#8DDB8C;">kavaref-extension</span><span style="color:#ADBAC7;">:</span></span>
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||
<span class="line"><span style="color:#ADBAC7;"> </span><span style="color:#8DDB8C;">version</span><span style="color:#ADBAC7;">: </span><span style="color:#96D0FF;">+</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>在你的项目 <code>build.gradle.kts</code> 中配置依赖。</p><div class="language-kotlin line-numbers-mode" data-ext="kt"><pre class="shiki github-dark-dimmed" style="background-color:#22272e;" tabindex="0"><code><span class="line"><span style="color:#DCBDFB;">implementation</span><span style="color:#ADBAC7;">(com.highcapable.kavaref.kavaref.extension)</span></span>
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||
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="version-catalog" tabindex="-1"><a class="header-anchor" href="#version-catalog" aria-hidden="true">#</a> Version Catalog</h3><p>在你的项目 <code>gradle/libs.versions.toml</code> 中添加依赖。</p><div class="language-toml line-numbers-mode" data-ext="toml"><pre class="shiki github-dark-dimmed" style="background-color:#22272e;" tabindex="0"><code><span class="line"><span style="color:#ADBAC7;">[</span><span style="color:#F69D50;">versions</span><span style="color:#ADBAC7;">]</span></span>
|
||
<span class="line"><span style="color:#ADBAC7;">kavaref-extension = </span><span style="color:#96D0FF;">"<version>"</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="color:#ADBAC7;">[</span><span style="color:#F69D50;">libraries</span><span style="color:#ADBAC7;">]</span></span>
|
||
<span class="line"><span style="color:#ADBAC7;">kavaref-extension = { module = </span><span style="color:#96D0FF;">"com.highcapable.kavaref:kavaref-extension"</span><span style="color:#ADBAC7;">, version.ref = </span><span style="color:#96D0FF;">"kavaref-extension"</span><span style="color:#ADBAC7;"> }</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>在你的项目 <code>build.gradle.kts</code> 中配置依赖。</p><div class="language-kotlin line-numbers-mode" data-ext="kt"><pre class="shiki github-dark-dimmed" style="background-color:#22272e;" tabindex="0"><code><span class="line"><span style="color:#DCBDFB;">implementation</span><span style="color:#ADBAC7;">(libs.kavaref.extension)</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>请将 <code><version></code> 修改为此文档顶部显示的版本。</p><h3 id="传统方式" tabindex="-1"><a class="header-anchor" href="#传统方式" aria-hidden="true">#</a> 传统方式</h3><p>在你的项目 <code>build.gradle.kts</code> 中配置依赖。</p><div class="language-kotlin line-numbers-mode" data-ext="kt"><pre class="shiki github-dark-dimmed" style="background-color:#22272e;" tabindex="0"><code><span class="line"><span style="color:#DCBDFB;">implementation</span><span style="color:#ADBAC7;">(</span><span style="color:#96D0FF;">"com.highcapable.kavaref:kavaref-extension:<version>"</span><span style="color:#ADBAC7;">)</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>请将 <code><version></code> 修改为此文档顶部显示的版本。</p><h2 id="功能介绍" tabindex="-1"><a class="header-anchor" href="#功能介绍" aria-hidden="true">#</a> 功能介绍</h2><p>你可以 <a href="https://highcapable.github.io/KavaRef/KDoc/kavaref-extension" target="_blank" rel="noopener noreferrer">点击这里<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口中打开</span></span></a> 查看 KDoc。</p><h3 id="class-扩展" tabindex="-1"><a class="header-anchor" href="#class-扩展" aria-hidden="true">#</a> Class 扩展</h3><p>KavaRef 提供了一些扩展，在处理 <code>Class</code> 对象时会更加方便。</p><p>KavaRef 对 <code>Class</code> 的扩展同样添加了 <code>KClass</code> 扩展，作用是调用 <code>KClass.java</code>，写法上比直接使用 <code>Some::class.java</code> 更加简洁。</p><h4 id="创建-class-对象" tabindex="-1"><a class="header-anchor" href="#创建-class-对象" aria-hidden="true">#</a> 创建 Class 对象</h4><p>例如我们需要使用字符串类名创建一个 <code>Class</code> 对象。</p><blockquote><p>示例如下</p></blockquote><div class="language-kotlin line-numbers-mode" data-ext="kt"><pre class="shiki github-dark-dimmed" style="background-color:#22272e;" tabindex="0"><code><span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> myClass </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> </span><span style="color:#96D0FF;">"com.example.MyClass"</span><span style="color:#ADBAC7;">.</span><span style="color:#DCBDFB;">toClass</span><span style="color:#ADBAC7;">()</span></span>
|
||
<span class="line"><span style="color:#768390;">// 你可以使用带有 OrNull 后缀的方法在找不到 Class 时返回 null 而不是抛出异常</span></span>
|
||
<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> myClassOrNull </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> </span><span style="color:#96D0FF;">"com.example.MyClass"</span><span style="color:#ADBAC7;">.</span><span style="color:#DCBDFB;">toClassOrNull</span><span style="color:#ADBAC7;">()</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>这些方法统一使用 <code>ClassLoaderProvider</code> 来获取默认的 <code>ClassLoader</code>，你可以设置默认的 <code>ClassLoader</code> 以影响全局功能。</p><blockquote><p>示例如下</p></blockquote><div class="language-kotlin line-numbers-mode" data-ext="kt"><pre class="shiki github-dark-dimmed" style="background-color:#22272e;" tabindex="0"><code><span class="line"><span style="color:#ADBAC7;">ClassLoaderProvider.classLoader </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> </span><span style="color:#DCBDFB;">MyCustomClassLoader</span><span style="color:#ADBAC7;">()</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>你也可以手动向 <code>toClass</code> 方法传入一个 <code>ClassLoader</code> 参数来指定使用哪个 <code>ClassLoader</code>。</p><h4 id="class-对象引用" tabindex="-1"><a class="header-anchor" href="#class-对象引用" aria-hidden="true">#</a> Class 对象引用</h4><p>在 Kotlin 中引用 Java Class 需要写很长的声明，例如 <code>MyClass::class.java</code>，此时你可以用以下方式来简化。</p><blockquote><p>示例如下</p></blockquote><div class="language-kotlin line-numbers-mode" data-ext="kt"><pre class="shiki github-dark-dimmed" style="background-color:#22272e;" tabindex="0"><code><span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> myClass </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> </span><span style="color:#DCBDFB;">classOf</span><span style="color:#ADBAC7;"><</span><span style="color:#F69D50;">MyClass</span><span style="color:#ADBAC7;">>()</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>你可以使用 <code>isSubclassOf</code> 方法来判断一个 <code>Class</code> 是否是另一个 <code>Class</code> 的子类。</p><blockquote><p>示例如下</p></blockquote><div class="language-kotlin line-numbers-mode" data-ext="kt"><pre class="shiki github-dark-dimmed" style="background-color:#22272e;" tabindex="0"><code><span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> isSubclass </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> MyClass::</span><span style="color:#DCBDFB;">class</span><span style="color:#ADBAC7;"> isSubclassOf MySuperClass::</span><span style="color:#DCBDFB;">class</span></span>
|
||
<span class="line"><span style="color:#768390;">// 当然，它也有一个对应的反义判断方法</span></span>
|
||
<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> isNotSubclass </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> MyClass::</span><span style="color:#DCBDFB;">class</span><span style="color:#ADBAC7;"> isNotSubclassOf MySuperClass::</span><span style="color:#DCBDFB;">class</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>你还可以使用 <code>hasSuperclass</code> 和 <code>hasInterfaces</code> 方法来判断一个 <code>Class</code> 是否有超类或接口。</p><div class="custom-container danger"><p class="custom-container-title">特别注意</p><p><code>classOf</code> 方法传入的 <code>Class</code> 默认会进行 Java 包装类的拆箱操作，无论你传入的是类似 <code>kotlin.Boolean</code> 还是 <code>java.lang.Boolean</code> (参考下方的 <a href="#java-%E5%8C%85%E8%A3%85%E7%B1%BB%E6%89%A9%E5%B1%95">Java 包装类扩展</a>)， 如果你需要避免传入的 <code>Class</code> 被拆箱变为原始类型，你需要明确设置 <code>primitiveType = false</code> 参数。</p></div><h4 id="创建新的实例" tabindex="-1"><a class="header-anchor" href="#创建新的实例" aria-hidden="true">#</a> 创建新的实例</h4><p>KavaRef 为 <code>Class</code> 提供了一个方法来方便地创建一个新的实例，你不需要考虑构造参数的类型，你只需要传入对应的参数即可立即创建一个新的实例。</p><blockquote><p>示例如下</p></blockquote><div class="language-kotlin line-numbers-mode" data-ext="kt"><pre class="shiki github-dark-dimmed" style="background-color:#22272e;" tabindex="0"><code><span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> myClass </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> MyClass::</span><span style="color:#DCBDFB;">class</span><span style="color:#ADBAC7;">.</span><span style="color:#DCBDFB;">createInstance</span><span style="color:#ADBAC7;">(</span><span style="color:#96D0FF;">"Hello"</span><span style="color:#ADBAC7;">, </span><span style="color:#6CB6FF;">123</span><span style="color:#ADBAC7;">)</span></span>
|
||
<span class="line"><span style="color:#768390;">// 你也可以使用带有 OrNull 后缀的方法在创建失败时返回 null 而不是抛出异常</span></span>
|
||
<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> myClassOrNull </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> MyClass::</span><span style="color:#DCBDFB;">class</span><span style="color:#ADBAC7;">.</span><span style="color:#DCBDFB;">createInstanceOrNull</span><span style="color:#ADBAC7;">(</span><span style="color:#96D0FF;">"Hello"</span><span style="color:#ADBAC7;">, </span><span style="color:#6CB6FF;">123</span><span style="color:#ADBAC7;">)</span></span>
|
||
<span class="line"><span style="color:#768390;">// createInstance 方法默认仅过滤公开的构造方法，如果你需要调用非公有构造方法，请设置 isPublic = false</span></span>
|
||
<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> myClassWithPrivateConstructor </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> MyClass::</span><span style="color:#DCBDFB;">class</span><span style="color:#ADBAC7;">.</span><span style="color:#DCBDFB;">createInstance</span><span style="color:#ADBAC7;">(</span><span style="color:#96D0FF;">"Private!"</span><span style="color:#ADBAC7;">, isPublic </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> </span><span style="color:#6CB6FF;">false</span><span style="color:#ADBAC7;">)</span></span>
|
||
<span class="line"><span style="color:#768390;">// 如果你想指定创建实例的类型使用另一个类型，可以使用以下方法</span></span>
|
||
<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> mySuperClass </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> MyClas::</span><span style="color:#DCBDFB;">class</span><span style="color:#ADBAC7;">.</span><span style="color:#DCBDFB;">createInstanceAsType</span><span style="color:#ADBAC7;"><</span><span style="color:#F69D50;">MySuperClass</span><span style="color:#ADBAC7;">>(</span><span style="color:#96D0FF;">"Hello"</span><span style="color:#ADBAC7;">, </span><span style="color:#6CB6FF;">123</span><span style="color:#ADBAC7;">)</span></span>
|
||
<span class="line"><span style="color:#768390;">// 同样地，你也可以使用带有 OrNull 后缀的方法在创建失败时返回 null 而不是抛出异常</span></span>
|
||
<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> mySuperClassOrNull </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> MyClass::</span><span style="color:#DCBDFB;">class</span><span style="color:#ADBAC7;">.</span><span style="color:#DCBDFB;">createInstanceAsTypeOrNull</span><span style="color:#ADBAC7;"><</span><span style="color:#F69D50;">MySuperClass</span><span style="color:#ADBAC7;">>(</span><span style="color:#96D0FF;">"Hello"</span><span style="color:#ADBAC7;">, </span><span style="color:#6CB6FF;">123</span><span style="color:#ADBAC7;">)</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><div class="custom-container tip"><p class="custom-container-title">小提示</p><p><code>createInstance</code> 方法在成功匹配一次后，会将结果进行缓存防止重复反射造成的性能损耗，它是线程安全的，你可以放心在任何标准场景下使用。</p></div><div class="custom-container danger"><p class="custom-container-title">特别注意</p><p>当你传入带有 <code>null</code> 的参数时，KavaRef 会尝试将其作为可匹配到条件的一部分 (模糊条件)，准确性可能会下降。</p><p><code>createInstance</code> 方法不允许所有参数均为 <code>null</code> 的情况 (条件完全模糊)，会直接抛出异常，因为这种情况无法确定要创建哪个实例。</p></div><h4 id="class-修饰符" tabindex="-1"><a class="header-anchor" href="#class-修饰符" aria-hidden="true">#</a> Class 修饰符</h4><p>KavaRef 也对 <code>Modifier</code> 进行了扩展，你可以直接使用 <code>Class.isPublic</code> 等方法来判断一个 <code>Class</code> 的修饰符。</p><h4 id="variousclass" tabindex="-1"><a class="header-anchor" href="#variousclass" aria-hidden="true">#</a> VariousClass</h4><p>KavaRef 提供了 <code>VariousClass</code> 类来装载不确定完整类名的 <code>Class</code> 对象，并返回成功匹配到的第一个。</p><p>此功能通常可用于 Android 应用中那些被 R8 混淆后的类名。</p><blockquote><p>示例如下</p></blockquote><div class="language-kotlin line-numbers-mode" data-ext="kt"><pre class="shiki github-dark-dimmed" style="background-color:#22272e;" tabindex="0"><code><span class="line"><span style="color:#768390;">// 假设在 A 版本中，这个类为 com.example.a，</span></span>
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<span class="line"><span style="color:#768390;">// 在 B 版本中，这个类为 com.example.b</span></span>
|
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<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> myClass </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> </span><span style="color:#DCBDFB;">VariousClass</span><span style="color:#ADBAC7;">(</span><span style="color:#96D0FF;">"com.example.a"</span><span style="color:#ADBAC7;">, </span><span style="color:#96D0FF;">"com.example.b"</span><span style="color:#ADBAC7;">).</span><span style="color:#DCBDFB;">load</span><span style="color:#ADBAC7;">()</span></span>
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<span class="line"><span style="color:#768390;">// 你也可以使用后缀名为 OrNull 的方法在找不到 Class 时返回 null 而不是抛出异常</span></span>
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<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> myClassOrNull </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> </span><span style="color:#DCBDFB;">VariousClass</span><span style="color:#ADBAC7;">(</span><span style="color:#96D0FF;">"com.example.a"</span><span style="color:#ADBAC7;">, </span><span style="color:#96D0FF;">"com.example.b"</span><span style="color:#ADBAC7;">).</span><span style="color:#DCBDFB;">loadOrNull</span><span style="color:#ADBAC7;">()</span></span>
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<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h4 id="延迟装载-class-对象" tabindex="-1"><a class="header-anchor" href="#延迟装载-class-对象" aria-hidden="true">#</a> 延迟装载 Class 对象</h4><p>KavaRef 提供了 <code>LazyClass</code> 类来延迟装载 <code>Class</code> 对象。</p><p>你可以在需要时再装载 <code>Class</code>，而不是在创建时就立即装载，这可以解决一些需要运行时或运行到特定条件下才需要装载的 <code>Class</code>。</p><blockquote><p>示例如下</p></blockquote><div class="language-kotlin line-numbers-mode" data-ext="kt"><pre class="shiki github-dark-dimmed" style="background-color:#22272e;" tabindex="0"><code><span class="line"><span style="color:#768390;">// 定义一个不可为空延迟装载的 Class 并托管给 myClass</span></span>
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<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> myClass </span><span style="color:#F47067;">by</span><span style="color:#ADBAC7;"> </span><span style="color:#DCBDFB;">lazyClass</span><span style="color:#ADBAC7;">(</span><span style="color:#96D0FF;">"com.example.MyClass"</span><span style="color:#ADBAC7;">)</span></span>
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<span class="line"><span style="color:#768390;">// 定义一个可为空延迟装载的 Class 并托管给 myClassOrNull</span></span>
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<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> myClassOrNull </span><span style="color:#F47067;">by</span><span style="color:#ADBAC7;"> </span><span style="color:#DCBDFB;">lazyClassOrNull</span><span style="color:#ADBAC7;">(</span><span style="color:#96D0FF;">"com.example.MyClass"</span><span style="color:#ADBAC7;">)</span></span>
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||
<span class="line"><span style="color:#768390;">// 它亦可支持传入 VariousClass</span></span>
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||
<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> otherClassOrNull </span><span style="color:#F47067;">by</span><span style="color:#ADBAC7;"> </span><span style="color:#DCBDFB;">lazyClassOrNull</span><span style="color:#ADBAC7;">(</span><span style="color:#DCBDFB;">VariousClass</span><span style="color:#ADBAC7;">(</span><span style="color:#96D0FF;">"com.example.a"</span><span style="color:#ADBAC7;">, </span><span style="color:#96D0FF;">"com.example.b"</span><span style="color:#ADBAC7;">))</span></span>
|
||
<span class="line"><span style="color:#768390;">// 在需要时调用即装载</span></span>
|
||
<span class="line"><span style="color:#ADBAC7;">myClass.</span><span style="color:#DCBDFB;">resolve</span><span style="color:#ADBAC7;">()</span></span>
|
||
<span class="line"><span style="color:#ADBAC7;">myClassOrNull?.</span><span style="color:#DCBDFB;">resolve</span><span style="color:#ADBAC7;">()</span></span>
|
||
<span class="line"><span style="color:#ADBAC7;">otherClassOrNull?.</span><span style="color:#DCBDFB;">resolve</span><span style="color:#ADBAC7;">()</span></span>
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||
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h4 id="classloader-扩展" tabindex="-1"><a class="header-anchor" href="#classloader-扩展" aria-hidden="true">#</a> ClassLoader 扩展</h4><p>KavaRef 还为 <code>ClassLoader</code> 提供了一些实用的扩展方法。</p><blockquote><p>示例如下</p></blockquote><div class="language-kotlin line-numbers-mode" data-ext="kt"><pre class="shiki github-dark-dimmed" style="background-color:#22272e;" tabindex="0"><code><span class="line"><span style="color:#768390;">// 假设这就是你的 ClassLoader</span></span>
|
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<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> classLoader: </span><span style="color:#F69D50;">ClassLoader</span></span>
|
||
<span class="line"><span style="color:#768390;">// 装载一个 Class，在装载失败时返回 null</span></span>
|
||
<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> myClassOrNull </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> classLoader.</span><span style="color:#DCBDFB;">loadClassOrNull</span><span style="color:#ADBAC7;">(</span><span style="color:#96D0FF;">"com.example.MyClass"</span><span style="color:#ADBAC7;">)</span></span>
|
||
<span class="line"><span style="color:#768390;">// 判断这个 Class 是否存在于当前 ClassLoader 中</span></span>
|
||
<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> isClassExists </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> classLoader.</span><span style="color:#DCBDFB;">hasClass</span><span style="color:#ADBAC7;">(</span><span style="color:#96D0FF;">"com.example.MyClass"</span><span style="color:#ADBAC7;">)</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="数组-class-扩展" tabindex="-1"><a class="header-anchor" href="#数组-class-扩展" aria-hidden="true">#</a> 数组 Class 扩展</h3><p>在 Java 中，数组的 <code>Class</code> 对象是一个特殊的 <code>Class</code> 对象，通常，我们创建它的方式如下。</p><p>例如创建一个 <code>java.lang.String[]</code> 的 <code>Class</code> 对象。</p><blockquote><p>示例如下</p></blockquote><div class="language-kotlin line-numbers-mode" data-ext="kt"><pre class="shiki github-dark-dimmed" style="background-color:#22272e;" tabindex="0"><code><span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> arrayClass </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> java.lang.reflect.Array.</span><span style="color:#DCBDFB;">newInstance</span><span style="color:#ADBAC7;">(String::</span><span style="color:#DCBDFB;">class</span><span style="color:#ADBAC7;">.java, </span><span style="color:#6CB6FF;">0</span><span style="color:#ADBAC7;">).javaClass</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>这样写起来非常长，而且不方便维护，所以 KavaRef 提供了一个方法来简化这个过程。</p><p>现在，创建 <code>java.lang.String[]</code> 的 <code>Class</code> 对象可以这样写。</p><blockquote><p>示例如下</p></blockquote><div class="language-kotlin line-numbers-mode" data-ext="kt"><pre class="shiki github-dark-dimmed" style="background-color:#22272e;" tabindex="0"><code><span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> arrayClass </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> </span><span style="color:#DCBDFB;">ArrayClass</span><span style="color:#ADBAC7;">(String::</span><span style="color:#DCBDFB;">class</span><span style="color:#ADBAC7;">)</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><h3 id="member-扩展" tabindex="-1"><a class="header-anchor" href="#member-扩展" aria-hidden="true">#</a> Member 扩展</h3><p>KavaRef 提供了一些扩展方法来简化对 <code>Member</code> 的操作。</p><p>你可以在任何 <code>Member</code> 对象上使用 <code>makeAccessible</code> 方法来设置其可访问性。</p><p>如果 <code>Member</code> 是 <code>AccessibleObject</code> 类型即可生效。</p><blockquote><p>示例如下</p></blockquote><div class="language-kotlin line-numbers-mode" data-ext="kt"><pre class="shiki github-dark-dimmed" style="background-color:#22272e;" tabindex="0"><code><span class="line"><span style="color:#768390;">// 假设这个是你当前的 Member 对象</span></span>
|
||
<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> method: </span><span style="color:#F69D50;">Method</span></span>
|
||
<span class="line"><span style="color:#768390;">// 设置方法可访问</span></span>
|
||
<span class="line"><span style="color:#ADBAC7;">method.</span><span style="color:#DCBDFB;">makeAccessible</span><span style="color:#ADBAC7;">()</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>同样地，KavaRef 也对 <code>Modifier</code> 进行了扩展，你可以直接使用 <code>Member.isPublic</code> 等方法来判断一个 <code>Member</code> 的修饰符。</p><h3 id="type-扩展" tabindex="-1"><a class="header-anchor" href="#type-扩展" aria-hidden="true">#</a> Type 扩展</h3><p>在 Java 中操作类型或泛型类型时，通常需要使用 <code>Type</code> 接口及其子接口来处理。</p><p>KavaRef 提供了一些扩展方法来简化对 <code>Type</code> 的操作。</p><p>例如，你可以将一个符合要求的 <code>Type</code> 转换为 <code>Class</code> 对象。</p><blockquote><p>示例如下</p></blockquote><div class="language-kotlin line-numbers-mode" data-ext="kt"><pre class="shiki github-dark-dimmed" style="background-color:#22272e;" tabindex="0"><code><span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> type: </span><span style="color:#F69D50;">Type</span></span>
|
||
<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> clazz </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> type.</span><span style="color:#DCBDFB;">toClass</span><span style="color:#ADBAC7;">()</span></span>
|
||
<span class="line"><span style="color:#768390;">// 你也可以使用后缀名为 OrNull 的方法在转换失败时返回 null 而不是抛出异常</span></span>
|
||
<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> clazzOrNull </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> type.</span><span style="color:#DCBDFB;">toClassOrNull</span><span style="color:#ADBAC7;">()</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>你也可以将符合要求的 <code>Type</code> 转换为 <code>ParameterizedType</code> 对象。</p><blockquote><p>示例如下</p></blockquote><div class="language-kotlin line-numbers-mode" data-ext="kt"><pre class="shiki github-dark-dimmed" style="background-color:#22272e;" tabindex="0"><code><span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> type: </span><span style="color:#F69D50;">Type</span></span>
|
||
<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> parameterizedType </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> type.</span><span style="color:#DCBDFB;">asParameterizedType</span><span style="color:#ADBAC7;">()</span></span>
|
||
<span class="line"><span style="color:#768390;">// 你也可以使用后缀名为 OrNull 的方法在转换失败时返回 null 而不是抛出异常</span></span>
|
||
<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> parameterizedTypeOrNull </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> type.</span><span style="color:#DCBDFB;">asParameterizedTypeOrNull</span><span style="color:#ADBAC7;">()</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>你还可以使用以下方式获取超类中的泛型参数数组，这在一些超类与子类的封装操作中会经常用到。</p><blockquote><p>示例如下</p></blockquote><div class="language-kotlin line-numbers-mode" data-ext="kt"><pre class="shiki github-dark-dimmed" style="background-color:#22272e;" tabindex="0"><code><span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> myClass: </span><span style="color:#F69D50;">Class</span><span style="color:#ADBAC7;"><*></span></span>
|
||
<span class="line"><span style="color:#768390;">// 获取 myClass 的超类的泛型参数数组，获取失败或无法获取时将返回空数组</span></span>
|
||
<span class="line"><span style="color:#F47067;">val</span><span style="color:#ADBAC7;"> arguments </span><span style="color:#F47067;">=</span><span style="color:#ADBAC7;"> myClass.</span><span style="color:#DCBDFB;">genericSuperclassTypeArguments</span><span style="color:#ADBAC7;">()</span></span>
|
||
<span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="java-包装类扩展" tabindex="-1"><a class="header-anchor" href="#java-包装类扩展" aria-hidden="true">#</a> Java 包装类扩展</h3><p>在 Kotlin 中直接使用 <code>Boolean::class</code>、<code>Byte::class</code> 等方式获取到的是 Java 的原始类型 <code>boolean</code>、<code>byte</code> 而不是它们的包装类。</p><p>如果你需要获取 Java 的包装类，你需要使用完整的 <code>java.lang.Boolean::class</code>、<code>java.lang.Byte::class</code> 等方式或使用 <code>Boolean::class.javaObjectType</code>、<code>Byte::class.javaObjectType</code>。</p><p>所以，KavaRef 提供了一些类型别名来处理 Java 的包装类，现在你只需要在这些类型加上 <code>J</code> 前缀即可，例如 <code>JBoolean::class</code>， 它等价于 <code>java.lang.Boolean::class</code>，部分类型需要填写全称，例如 <code>JInteger::class</code>。</p></div><!--[--><!--]--></div><footer class="page-meta"><div class="meta-item edit-link"><a class="external-link meta-item-label" href="https://github.com/HighCapable/KavaRef/edit/main/docs-source/src/zh-cn/library/kavaref-extension.md" rel="noopener noreferrer" target="_blank" aria-label="在 GitHub 上编辑此页"><!--[--><!--]--> 在 GitHub 上编辑此页 <span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">在新窗口中打开</span></span><!--[--><!--]--></a></div><div class="meta-item last-updated"><span class="meta-item-label">上次更新: </span><!----></div><div class="meta-item contributors"><span class="meta-item-label">贡献者: </span><span class="meta-item-info"><!--[--><!--[--><span class="contributor" title="email: qzmmcn@163.com">fankesyooni</span><!----><!--]--><!--]--></span></div></footer><nav class="page-nav"><p class="inner"><span class="prev"><a href="/KavaRef/zh-cn/library/kavaref-core.html" class="" aria-label="kavaref-core"><!--[--><!--]--> kavaref-core <!--[--><!--]--></a></span><!----></p></nav><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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