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<div id="app" data-server-rendered="true"><div class="theme-container vuepress-theme-fast"><header class="navbar"><div class="sidebar-button"><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" role="img" viewBox="0 0 448 512" class="icon"><path fill="currentColor" d="M436 124H12c-6.627 0-12-5.373-12-12V80c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12z"></path></svg></div><a href="/zh/" class="home-link router-link-active"><img src="/logo@2x.svg" alt="WEEX" class="logo"></a><span class="version"><a href="/download/download.html" class="version-bg"><img src="/assets/img/version-bg.ab65ded9.svg" alt="v0.28"><span class="version-no">v0.28</span></a></span><div class="links"><form id="search-form" class="algolia-search-wrapper 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router-link-active">简体中文</a></li></ul></div></div></nav><a href="https://github.com/apache/incubator-weex" target="_blank" rel="noopener noreferrer" class="repo-link"><img src="/assets/img/github.7cb484a9.svg" alt="github" class="github-icon"></a></div></header><div class="sidebar-mask"></div><div class="sidebar"><nav class="nav-links"><div class="nav-item"><a href="/zh/guide/" class="nav-link">指南</a></div><div class="nav-item"><a href="/zh/docs/" class="nav-link router-link-active">文档</a></div><div class="nav-item"><a href="/zh/tools/" class="nav-link">第三方工具</a></div><div class="nav-item"><a href="/zh/download/" class="nav-link">下载</a></div><div class="nav-item"><a href="/zh/community/" class="nav-link">社区</a></div><div class="nav-item"><a href="/zh/blog/" class="nav-link">博客</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">选择语言</span><span class="arrow right"></span></a><ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----><a href="/docs/api/android-apis.html" class="nav-link">English</a></li><li class="dropdown-item"><!----><a href="/zh/docs/api/android-apis.html" class="nav-link router-link-exact-active router-link-active">简体中文</a></li></ul></div></div></nav><ul class="sidebar-links"><li><div class="sidebar-group first"><p class="sidebar-heading open"><span>API</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/docs/api/weex-variable.html" class="sidebar-link">Weex 环境变量</a></li><li><a href="/zh/docs/api/android-apis.html" class="active sidebar-link">Android 接口</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/zh/docs/api/android-apis.html#自定义发送事件" class="sidebar-link">自定义发送事件</a></li><li class="sidebar-sub-header"><a href="/zh/docs/api/android-apis.html#结果回调" class="sidebar-link">结果回调</a></li><li class="sidebar-sub-header"><a href="/zh/docs/api/android-apis.html#onwxscrolllistener" class="sidebar-link">OnWXScrollListener</a></li><li class="sidebar-sub-header"><a href="/zh/docs/api/android-apis.html#其它的一些接口介绍" class="sidebar-link">其它的一些接口介绍</a></li></ul></li><li><a href="/zh/docs/api/ios-apis.html" class="sidebar-link">iOS 接口</a></li><li><a href="/zh/docs/api/js-service.html" class="sidebar-link">JS 服务</a></li><li><a href="/zh/docs/api/broadcast-channel.html" class="sidebar-link">跨页面通信</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>内置组件</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/docs/components/a.html" class="sidebar-link">&lt;a&gt;</a></li><li><a href="/zh/docs/components/div.html" class="sidebar-link">&lt;div&gt;</a></li><li><a href="/zh/docs/components/text.html" class="sidebar-link">&lt;text&gt;</a></li><li><a href="/zh/docs/components/image.html" class="sidebar-link">&lt;image&gt;</a></li><li><a href="/zh/docs/components/list.html" class="sidebar-link">&lt;list&gt;</a></li><li><a href="/zh/docs/components/cell.html" class="sidebar-link">&lt;cell&gt;</a></li><li><a href="/zh/docs/components/loading.html" class="sidebar-link">&lt;loading&gt;</a></li><li><a href="/zh/docs/components/refresh.html" class="sidebar-link">&lt;refresh&gt;</a></li><li><a href="/zh/docs/components/recycle-list.html" class="sidebar-link">&lt;recycle-list&gt;</a></li><li><a href="/zh/docs/components/scroller.html" class="sidebar-link">&lt;scroller&gt;</a></li><li><a href="/zh/docs/components/slider.html" class="sidebar-link">&lt;slider&gt;</a></li><li><a href="/zh/docs/components/indicator.html" class="sidebar-link">&lt;indicator&gt;</a></li><li><a href="/zh/docs/components/textarea.html" class="sidebar-link">&lt;textarea&gt;</a></li><li><a href="/zh/docs/components/input.html" class="sidebar-link">&lt;input&gt;</a></li><li><a href="/zh/docs/components/waterfall.html" class="sidebar-link">&lt;waterfall&gt;</a></li><li><a href="/zh/docs/components/video.html" class="sidebar-link">&lt;video&gt;</a></li><li><a href="/zh/docs/components/web.html" class="sidebar-link">&lt;web&gt;</a></li><li><a href="/zh/docs/components/richtext.html" class="sidebar-link">&lt;richtext&gt;</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>内置模块</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/docs/modules/animation.html" class="sidebar-link">animation</a></li><li><a href="/zh/docs/modules/clipboard.html" class="sidebar-link">clipboard</a></li><li><a href="/zh/docs/modules/dom.html" class="sidebar-link">dom</a></li><li><a href="/zh/docs/modules/globalEvent.html" class="sidebar-link">globalEvent</a></li><li><a href="/zh/docs/modules/meta.html" class="sidebar-link">meta</a></li><li><a href="/zh/docs/modules/modal.html" class="sidebar-link">modal</a></li><li><a href="/zh/docs/modules/navigator.html" class="sidebar-link">navigator</a></li><li><a href="/zh/docs/modules/picker.html" class="sidebar-link">picker</a></li><li><a href="/zh/docs/modules/storage.html" class="sidebar-link">storage</a></li><li><a href="/zh/docs/modules/stream.html" class="sidebar-link">stream</a></li><li><a href="/zh/docs/modules/webview.html" class="sidebar-link">webview</a></li><li><a href="/zh/docs/modules/websockets.html" class="sidebar-link">webSockets</a></li><li><a href="/zh/docs/modules/deviceInfo.html" class="sidebar-link">deviceInfo</a></li><li><a href="/zh/docs/modules/console-log.html" class="sidebar-link">console-log</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>样式</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/docs/styles/common-styles.html" class="sidebar-link">通用样式</a></li><li><a href="/zh/docs/styles/text-styles.html" class="sidebar-link">文本样式</a></li><li><a href="/zh/docs/styles/css-units.html" class="sidebar-link">CSS 单位</a></li><li><a href="/zh/docs/styles/color-name.html" class="sidebar-link">颜色值</a></li></ul></div></li><li><div class="sidebar-group"><p class="sidebar-heading"><span>事件</span><!----></p><ul class="sidebar-group-items"><li><a href="/zh/docs/events/common-events.html" class="sidebar-link">通用事件</a></li><li><a href="/zh/docs/events/event-bubbling.html" class="sidebar-link">事件冒泡</a></li><li><a href="/zh/docs/events/gesture.html" class="sidebar-link">手势</a></li></ul></div></li></ul></div><div class="page"><div class="content"><h1 id="wxsdkinstance"><a href="#wxsdkinstance" class="header-anchor">#</a> WXSDKInstance</h1><p>Weex Native 和 JavaScript 交互通信.</p><h2 id="自定义发送事件"><a href="#自定义发送事件" class="header-anchor">#</a> 自定义发送事件</h2><p>向JS环境发送一些事件,比如<code>click</code>事件</p><div class="language- extra-class"><pre class="language-text"><code>void fireEvent(elementRef,type)
void fireEvent(elementRef,type, data)
void fireEvent(elementRef,type,data,domChanges)
</code></pre></div><ul><li><p><code>elementRef</code>(<em>String</em>):产生事件的组件id</p></li><li><p><code>type</code>(<em>String</em>): 事件名称,weex默认事件名称格式为&quot;onXXX&quot;,比如<code>OnPullDown</code></p></li><li><p><code>data</code>(<em>Map&lt;String, Object&gt;</em>): 需要发送的一些额外数据,比如<code>click</code>时,view大小,点击坐标等等。</p></li><li><p><code>domChanges</code>(<em>Map&lt;String, Object&gt;</em>): 目标组件的属性和样式发生的修改内容</p></li></ul><h2 id="结果回调"><a href="#结果回调" class="header-anchor">#</a> 结果回调</h2><p>JS调用时,有的场景需要返回一些数,比如以下例子,返回x、y坐标</p><div class="language- extra-class"><pre class="language-text"><code>public class WXLocation extends WXModule {
@JSMethod
public void getLocation(JSCallback callback){
//Get the code for the location information .....
Map&lt;String,String&gt; data=new HashMap&lt;&gt;();
data.put(&quot;x&quot;,&quot;x&quot;);
data.put(&quot;y&quot;,&quot;y&quot;);
//notify once
callback.invoke(data);
//Continuous connection
callback.invokeAndKeepAlive(data);
//Invoke method and invokeAndKeepAlive two methods of choice }
}
</code></pre></div><h2 id="onwxscrolllistener"><a href="#onwxscrolllistener" class="header-anchor">#</a> OnWXScrollListener</h2><p>如果想要拿到instance滚动的信息,需要在<code>WXSDKInstance</code>上注册<code>registerOnWXScrollListener</code> ,详细参数见<code>OnWXScrollListener</code></p><h2 id="其它的一些接口介绍"><a href="#其它的一些接口介绍" class="header-anchor">#</a> 其它的一些接口介绍</h2><h3 id="设置instance显示的大小"><a href="#设置instance显示的大小" class="header-anchor">#</a> 设置instance显示的大小</h3><p>使用<code>mWXSDKInstance.setSize()</code>来改变instance容器显示的大小</p><h3 id="降级"><a href="#降级" class="header-anchor">#</a> 降级</h3><p>Weex在开发过程中,会不断增加新的feature,但是这些feature可能在老版本上不兼容。这种情况下,native可以在<code>IWXRenderListener</code><code>onException</code>中进行判断,如果错误信息是 &quot;|&quot;格式. 并且分割后,&quot;|&quot;前第一个字符串等于1,这时候native可以直接降级到h5页面或者提示用户当前版本不支持。</p></div><div class="page-nav"><p class="inner"><span class="prev">
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