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@@ -14,7 +14,7 @@
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{"zIndex":100}
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)
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});
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</script><script src="/react-native/js/scrollSpy.js"></script><link rel="stylesheet" href="/react-native/css/prism.css"/><link rel="stylesheet" href="/react-native/css/main.css"/><script src="/react-native/js/codetabs.js"></script></head><body class="sideNavVisible"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/react-native/"><img class="logo" src="/react-native/img/header_logo.png" alt="React Native"/><h2 class="headerTitleWithLogo">React Native</h2></a><a href="/react-native/versions"><h3>0.60</h3></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class="siteNavGroupActive"><a href="/react-native/docs/getting-started" target="_self">Docs</a></li><li class=""><a href="/react-native/docs/activityindicator" target="_self">API</a></li><li class=""><a href="/react-native/help" target="_self">Community</a></li><li class=""><a href="/react-native/blog/" target="_self">Blog</a></li><li class="navSearchWrapper reactNavSearchWrapper"><input type="text" id="search_input_react" placeholder="Search" title="Search"/></li><li class=""><a href="https://github.com/facebook/react-native" target="_self">GitHub</a></li></ul></nav></div></header></div></div><div class="navPusher"><div class="docMainWrapper wrapper"><div class="container docsNavContainer" id="docsNav"><nav class="toc"><div class="toggleNav"><section class="navWrapper wrapper"><div class="navBreadcrumb wrapper"><div class="navToggle" id="navToggler"><div class="hamburger-menu"><div class="line1"></div><div class="line2"></div><div class="line3"></div></div></div><h2><i>›</i><span>Guides (Android)</span></h2></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">The Basics<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/react-native/docs/getting-started">Getting Started</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/tutorial">Learn the Basics</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/props">Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/state">State</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/style">Style</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/height-and-width">Height and Width</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/flexbox">Layout with Flexbox</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/handling-text-input">Handling Text Input</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/handling-touches">Handling Touches</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/using-a-scrollview">Using a ScrollView</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/using-a-listview">Using List Views</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/network">Networking</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/more-resources">More Resources</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Guides<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/react-native/docs/components-and-apis">Components and APIs</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/platform-specific-code">Platform Specific Code</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/navigation">Navigating Between Screens</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/images">Images</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/animations">Animations</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/accessibility">Accessibility</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/improvingux">Improving User Experience</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/timers">Timers</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/debugging">Debugging</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/performance">Performance</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/gesture-responder-system">Gesture Responder System</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/javascript-environment">JavaScript Environment</a></li><lLine truncated
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</script><script src="/react-native/js/scrollSpy.js"></script><link rel="stylesheet" href="/react-native/css/prism.css"/><link rel="stylesheet" href="/react-native/css/main.css"/><script src="/react-native/js/codetabs.js"></script></head><body class="sideNavVisible"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/react-native/"><img class="logo" src="/react-native/img/header_logo.png" alt="React Native"/><h2 class="headerTitleWithLogo">React Native</h2></a><a href="/react-native/versions"><h3>0.60</h3></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class="siteNavGroupActive"><a href="/react-native/docs/getting-started" target="_self">Docs</a></li><li class=""><a href="/react-native/docs/activityindicator" target="_self">API</a></li><li class=""><a href="/react-native/help" target="_self">Community</a></li><li class=""><a href="/react-native/blog/" target="_self">Blog</a></li><li class="navSearchWrapper reactNavSearchWrapper"><input type="text" id="search_input_react" placeholder="Search" title="Search"/></li><li class=""><a href="https://github.com/facebook/react-native" target="_self">GitHub</a></li></ul></nav></div></header></div></div><div class="navPusher"><div class="docMainWrapper wrapper"><div class="container docsNavContainer" id="docsNav"><nav class="toc"><div class="toggleNav"><section class="navWrapper wrapper"><div class="navBreadcrumb wrapper"><div class="navToggle" id="navToggler"><div class="hamburger-menu"><div class="line1"></div><div class="line2"></div><div class="line3"></div></div></div><h2><i>›</i><span>Guides (Android)</span></h2></div><div class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">The Basics<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/react-native/docs/getting-started">Getting Started</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/tutorial">Learn the Basics</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/props">Props</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/state">State</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/style">Style</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/height-and-width">Height and Width</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/flexbox">Layout with Flexbox</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/handling-text-input">Handling Text Input</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/handling-touches">Handling Touches</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/using-a-scrollview">Using a ScrollView</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/using-a-listview">Using List Views</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/network">Networking</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/more-resources">More Resources</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Guides<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/react-native/docs/optimizing-flatlist-configuration">Optimizing Flatlist Configuration</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/components-and-apis">Components and APIs</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/platform-specific-code">Platform Specific Code</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/navigation">Navigating Between Screens</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/images">Images</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/animations">Animations</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/accessibility">Accessibility</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/improvingux">Improving User Experience</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/timers">Timers</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/debugging">Debugging</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/performance">Performance</a></li><li class="navListItem"><a class="navItem" href="/react-native/docs/gesture-responder-system">Gesture RespoLine truncated
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var coll = document.getElementsByClassName('collapsible');
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var checkActiveCategory = true;
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for (var i = 0; i < coll.length; i++) {
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@@ -204,7 +204,7 @@ module<span class="token punctuation">.</span>exports <span class="token operato
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ToastExample<span class="token punctuation">.</span><span class="token function">show</span><span class="token punctuation">(</span><span class="token string">'Awesome'</span><span class="token punctuation">,</span> ToastExample<span class="token punctuation">.</span><span class="token constant">SHORT</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre>
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<p>Please make sure this JavasScript file to be the same hierarchy as <code>ToastExample.js</code>.</p>
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<p>Please make sure this JavaScript is in the same hierarchy as <code>ToastExample.js</code>.</p>
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<h2><a class="anchor" aria-hidden="true" id="beyond-toasts"></a><a href="#beyond-toasts" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Beyond Toasts</h2>
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<h3><a class="anchor" aria-hidden="true" id="callbacks"></a><a href="#callbacks" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Callbacks</h3>
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<p>Native modules also support a special kind of argument - a callback. In most cases it is used to provide the function call result to JavaScript.</p>
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@@ -249,7 +249,7 @@ ToastExample<span class="token punctuation">.</span><span class="token function"
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<p>A native module is supposed to invoke its callback only once. It can, however, store the callback and invoke it later.</p>
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<p>It is very important to highlight that the callback is not invoked immediately after the native function completes - remember that bridge communication is asynchronous, and this too is tied to the run loop.</p>
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<h3><a class="anchor" aria-hidden="true" id="promises"></a><a href="#promises" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Promises</h3>
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<p>Native modules can also fulfill a promise, which can simplify your code, especially when using ES2016's <code>async/await</code> syntax. When the last parameter of a bridged native method is a <code>Promise</code>, its corresponding JS method will return a JS Promise object.</p>
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<p>Native modules can also fulfill a promise, which can simplify your JavaScript, especially when using ES2016's <code>async/await</code> syntax. When the last parameter of a bridged native method is a <code>Promise</code>, its corresponding JS method will return a JS Promise object.</p>
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<p>Refactoring the above code to use a promise instead of callbacks looks like this:</p>
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<pre><code class="hljs css language-java"><span class="token keyword">import</span> <span class="token namespace">com<span class="token punctuation">.</span>facebook<span class="token punctuation">.</span>react<span class="token punctuation">.</span>bridge</span><span class="token punctuation">.</span><span class="token class-name">Promise</span><span class="token punctuation">;</span>
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@@ -301,6 +301,8 @@ ToastExample<span class="token punctuation">.</span><span class="token function"
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<h3><a class="anchor" aria-hidden="true" id="sending-events-to-javascript"></a><a href="#sending-events-to-javascript" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Sending Events to JavaScript</h3>
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<p>Native modules can signal events to JavaScript without being invoked directly. The easiest way to do this is to use the <code>RCTDeviceEventEmitter</code> which can be obtained from the <code>ReactContext</code> as in the code snippet below.</p>
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<pre><code class="hljs css language-java"><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>
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<span class="token keyword">import</span> <span class="token namespace">com<span class="token punctuation">.</span>facebook<span class="token punctuation">.</span>react<span class="token punctuation">.</span>modules<span class="token punctuation">.</span>core</span><span class="token punctuation">.</span><span class="token class-name">DeviceEventManagerModule</span><span class="token punctuation">;</span>
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<span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>
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<span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">sendEvent</span><span class="token punctuation">(</span><span class="token class-name">ReactContext</span> reactContext<span class="token punctuation">,</span>
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<span class="token class-name">String</span> eventName<span class="token punctuation">,</span>
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<span class="token annotation punctuation">@Nullable</span> <span class="token class-name">WritableMap</span> params<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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