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tabindex="0" href="/docs/0.62/signed-apk-android">Publishing to Google Play Store</a></li><li class="menu__list-item"><a class="menu__link" tabindex="0" href="/docs/0.62/removing-default-permissions">Removing Default Permissions</a></li></ul></li><li class="menu__list-item menu__list-item--collapsed"><a class="menu__link menu__link--sublist" href="#!">Guides (iOS)</a><ul class="menu__list"><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/docs/0.62/native-modules-ios">Native Modules</a></li><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/docs/0.62/native-components-ios">Native UI Components</a></li><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/docs/0.62/linking-libraries-ios">Linking Libraries</a></li><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/docs/0.62/running-on-simulator-ios">Running On Simulator</a></li><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/docs/0.62/communication-ios">Communication between native and React Native</a></li><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/docs/0.62/app-extensions">App Extensions</a></li></ul></li></ul></div></div></div><main class="docMainContainer_1rYT"><div class="container padding-vert--lg docItemWrapper_1Hme"><div class="row"><div class="col docItemCol_2AGf"><div class="alert alert--warning margin-bottom--md" role="alert"><div>This is documentation for React Native <strong>0.62</strong>, which is no longer actively maintained.</div><div class="margin-top--md">For up-to-date documentation, see the <strong><a href="/docs/native-components-android">latest version</a></strong> (0.63).</div></div><div class="docItemContainer_1tAC"><article><div><span class="badge badge--secondary">Version: 0.62</span></div><header><h1 class="docTitle_cWlf">Native UI Components</h1></header><div class="markdown"><p>There are tons of native UI widgets out there ready to be used in the latest apps - some of them are part of the platform, others are available as third-party libraries, and still more might be in use in your very own portfolio. React Native has several of the most critical platform components already wrapped, like <code>ScrollView</code> and <code>TextInput</code>, but not all of them, and certainly not ones you might have written yourself for a previous app. Fortunately, we can wrap up these existing components for seamless integration with your React Native application.</p><p>Like the native module guide, this too is a more advanced guide that assumes you are somewhat familiar with Android SDK programming. This guide will show you how to build a native UI component, walking you through the implementation of a subset of the existing <code>ImageView</code> component available in the core React Native library.</p><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="imageview-example"></a>ImageView example<a aria-hidden="true" tabindex="-1" class="hash-link" href="#imageview-example" title="Direct link to heading">#</a></h2><p>For this example we are going to walk through the implementation requirements to allow the use of ImageViews in JavaScript.</p><p>Native views are created and manipulated by extending <code>ViewManager</code> or more commonly <code>SimpleViewManager</code> . A <code>SimpleViewManager</code> is convenient in this case because it applies common properties such as background color, opacity, and Flexbox layout.</p><p>These subclasses are essentially singletons - only one instance of each is created by the bridge. They vend native views to the <code>NativeViewHierarchyManager</code>, which delegates back to them to set and update the properties of the views as necessary. The <code>ViewManagers</code> are also typically the delegates for the views, sending events back to JavaScript via the bridge.</p><p>To vend a view:</p><ol><li>Create the ViewManager subclass.</li><li>Implement the <code>createViewInstance</code> method</li><li>Expose view property setters using <code>@ReactProp</code> (or <code>@ReactPropGroup</code>) annotation</li><li>Register the manager in <code>createViewManagers</code> of the applications package.</li><li>Implement the JavaScript module</li></ol><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="1-create-the-viewmanager-subclass"></a>1. Create the <code>ViewManager</code> subclass<a aria-hidden="true" tabindex="-1" class="hash-link" href="#1-create-the-viewmanager-subclass" title="Direct link to heading">#</a></h2><p>In this example we create view manager class <code>ReactImageManager</code> that extends <code>SimpleViewManager</code> of type <code>ReactImageView</code>. <code>ReactImageView</code> is the type of object managed by the manager, this will be the custom native view. Name returned by <code>getName</code> is used to reference the native view type from JavaScript.</p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-java codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token punctuation" style="color:#657b83">.</span><span class="token punctuation" style="color:#657b83">.</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token keyword" style="color:#c5a5c5">public</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">class</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">ReactImageManager</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">extends</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">SimpleViewManager</span><span class="token generics punctuation" style="color:#657b83">&lt;</span><span class="token generics class-name" style="color:#fac863">ReactImageView</span><span class="token generics punctuation" style="color:#657b83">&gt;</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">public</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">final</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">String</span><span class="token plain"> REACT_CLASS </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> </span><span class="token string" style="color:#8dc891">&quot;RCTImageView&quot;</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token class-name" style="color:#fac863">ReactApplicationContext</span><span class="token plain"> mCallerContext</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">public</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">ReactImageManager</span><span class="token punctuation" style="color:#657b83">(</span><span class="token class-name" style="color:#fac863">ReactApplicationContext</span><span class="token plain"> reactContext</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> mCallerContext </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> reactContext</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">}</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token annotation punctuation" style="color:#657b83">@Override</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">public</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">String</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">getName</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">return</span><span class="token plain"> REACT_CLASS</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">}</span></div></div></div></div></div><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="2-implement-method-createviewinstance"></a>2. Implement method <code>createViewInstance</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#2-implement-method-createviewinstance" title="Direct link to heading">#</a></h2><p>Views are created in the <code>createViewInstance</code> method, the view should initialize itself in its default state, any properties will be set via a follow up call to <code>updateView.</code></p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-java codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token annotation punctuation" style="color:#657b83">@Override</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">public</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">ReactImageView</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">createViewInstance</span><span class="token punctuation" style="color:#657b83">(</span><span class="token class-name" style="color:#fac863">ThemedReactContext</span><span class="token plain"> context</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">return</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">new</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">ReactImageView</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">context</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">Fresco</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">newDraweeControllerBuilder</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">null</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> mCallerContext</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">}</span></div></div></div></div></div><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="3-expose-view-property-setters-using-reactprop-or-reactpropgroup-annotation"></a>3. Expose view property setters using <code>@ReactProp</code> (or <code>@ReactPropGroup</code>) annotation<a aria-hidden="true" tabindex="-1" class="hash-link" href="#3-expose-view-property-setters-using-reactprop-or-reactpropgroup-annotation" title="Direct link to heading">#</a></h2><p>Properties that are to be reflected in JavaScript needs to be exposed as setter method annotated with <code>@ReactProp</code> (or <code>@ReactPropGroup</code>). Setter method should take view to be updated (of the current view type) as a first argument and property value as a second argument. Setter should be declared as a <code>void</code> method and should be <code>public</code>. Property type sent to JS is determined automatically based on the type of value argument of the setter. The following type of values are currently supported: <code>boolean</code>, <code>int</code>, <code>float</code>, <code>double</code>, <code>String</code>, <code>Boolean</code>, <code>Integer</code>, <code>ReadableArray</code>, <code>ReadableMap</code>.</p><p>Annotation <code>@ReactProp</code> has one obligatory argument <code>name</code> of type <code>String</code>. Name assigned to the <code>@ReactProp</code> annotation linked to the setter method is used to reference the property on JS side.</p><p>Except from <code>name</code>, <code>@ReactProp</code> annotation may take following optional arguments: <code>defaultBoolean</code>, <code>defaultInt</code>, <code>defaultFloat</code>. Those arguments should be of the corresponding type (accordingly <code>boolean</code>, <code>int</code>, <code>float</code>) and the value provided will be passed to the setter method in case when the property that the setter is referencing has been removed from the component. Note that &quot;default&quot; values are only provided for primitive types, in case when setter is of some complex type, <code>null</code> will be provided as a default value in case when corresponding property gets removed.</p><p>Setter declaration requirements for methods annotated with <code>@ReactPropGroup</code> are different than for <code>@ReactProp</code>, please refer to the <code>@ReactPropGroup</code> annotation class docs for more information about it. <strong>IMPORTANT!</strong> in ReactJS updating the property value will result in setter method call. Note that one of the ways we can update component is by removing properties that have been set before. In that case setter method will be called as well to notify view manager that property has changed. In that case &quot;default&quot; value will be provided (for primitive types &quot;default&quot; can value can be specified using <code>defaultBoolean</code>, <code>defaultFloat</code>, etc. arguments of <code>@ReactProp</code> annotation, for complex types setter will be called with value set to <code>null</code>).</p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-java codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token annotation punctuation" style="color:#657b83">@ReactProp</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">name </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> </span><span class="token string" style="color:#8dc891">&quot;src&quot;</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">public</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">void</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">setSrc</span><span class="token punctuation" style="color:#657b83">(</span><span class="token class-name" style="color:#fac863">ReactImageView</span><span class="token plain"> view</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> </span><span class="token annotation punctuation" style="color:#657b83">@Nullable</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">ReadableArray</span><span class="token plain"> sources</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> view</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">setSource</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">sources</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">}</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token annotation punctuation" style="color:#657b83">@ReactProp</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">name </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> </span><span class="token string" style="color:#8dc891">&quot;borderRadius&quot;</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> defaultFloat </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> </span><span class="token number" style="color:#5a9bcf">0f</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">public</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">void</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">setBorderRadius</span><span class="token punctuation" style="color:#657b83">(</span><span class="token class-name" style="color:#fac863">ReactImageView</span><span class="token plain"> view</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">float</span><span class="token plain"> borderRadius</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> view</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">setBorderRadius</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">borderRadius</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">}</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token annotation punctuation" style="color:#657b83">@ReactProp</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">name </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">ViewProps</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">RESIZE_MODE</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">public</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">void</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">setResizeMode</span><span class="token punctuation" style="color:#657b83">(</span><span class="token class-name" style="color:#fac863">ReactImageView</span><span class="token plain"> view</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> </span><span class="token annotation punctuation" style="color:#657b83">@Nullable</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">String</span><span class="token plain"> resizeMode</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> view</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">setScaleType</span><span class="token punctuation" style="color:#657b83">(</span><span class="token class-name" style="color:#fac863">ImageResizeMode</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">toScaleType</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">resizeMode</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">}</span></div></div></div></div></div><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="4-register-the-viewmanager"></a>4. Register the <code>ViewManager</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#4-register-the-viewmanager" title="Direct link to heading">#</a></h2><p>The final Java step is to register the ViewManager to the application, this happens in a similar way to <a href="/docs/0.62/native-modules-android">Native Modules</a>, via the applications package member function <code>createViewManagers.</code></p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-java codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token annotation punctuation" style="color:#657b83">@Override</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">public</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">List</span><span class="token generics punctuation" style="color:#657b83">&lt;</span><span class="token generics class-name" style="color:#fac863">ViewManager</span><span class="token generics punctuation" style="color:#657b83">&gt;</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">createViewManagers</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token class-name" style="color:#fac863">ReactApplicationContext</span><span class="token plain"> reactContext</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">return</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">Arrays</span><span class="token punctuation" style="color:#657b83">.</span><span class="token generics punctuation" style="color:#657b83">&lt;</span><span class="token generics class-name" style="color:#fac863">ViewManager</span><span class="token generics punctuation" style="color:#657b83">&gt;</span><span class="token function" style="color:#79b6f2">asList</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">new</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">ReactImageManager</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">}</span></div></div></div></div></div><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="5-implement-the-javascript-module"></a>5. Implement the JavaScript module<a aria-hidden="true" tabindex="-1" class="hash-link" href="#5-implement-the-javascript-module" title="Direct link to heading">#</a></h2><p>The very final step is to create the JavaScript module that defines the interface layer between Java and JavaScript for the users of your new view. It is recommended for you to document the component interface in this module (e.g. using Flow, TypeScript, or plain old comments).</p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token comment" style="color:#93a1a1">// ImageView.js</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token keyword" style="color:#c5a5c5">import</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"> requireNativeComponent </span><span class="token punctuation" style="color:#657b83">}</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">from</span><span class="token plain"> </span><span class="token string" style="color:#8dc891">&#x27;react-native&#x27;</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token comment" style="color:#93a1a1">/**</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token comment" style="color:#93a1a1"> * Composes `View`.</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token comment" style="color:#93a1a1"> *</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token comment" style="color:#93a1a1"> * - src: string</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token comment" style="color:#93a1a1"> * - borderRadius: number</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token comment" style="color:#93a1a1"> * - resizeMode: &#x27;cover&#x27; | &#x27;contain&#x27; | &#x27;stretch&#x27;</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token comment" style="color:#93a1a1"> */</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain">module</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">exports </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">requireNativeComponent</span><span class="token punctuation" style="color:#657b83">(</span><span class="token string" style="color:#8dc891">&#x27;RCTImageView&#x27;</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span></div></div></div></div></div><p>The <code>requireNativeComponent</code> function takes the name of the native view. Note that if your component needs to do anything more sophisticated (e.g. custom event handling), you should wrap the native component in another React component. This is illustrated in the <code>MyCustomView</code> example below.</p><h1><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="events"></a>Events<a aria-hidden="true" tabindex="-1" class="hash-link" href="#events" title="Direct link to heading">#</a></h1><p>So now we know how to expose native view components that we can control freely from JS, but how do we deal with events from the user, like pinch-zooms or panning? When a native event occurs the native code should issue an event to the JavaScript representation of the View, and the two views are linked with the value returned from the <code>getId()</code> method.</p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-java codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">class</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">MyCustomView</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">extends</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">View</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">.</span><span class="token punctuation" style="color:#657b83">.</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">public</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">void</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">onReceiveNativeEvent</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token class-name" style="color:#fac863">WritableMap</span><span class="token plain"> event </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">Arguments</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">createMap</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> event</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">putString</span><span class="token punctuation" style="color:#657b83">(</span><span class="token string" style="color:#8dc891">&quot;message&quot;</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> </span><span class="token string" style="color:#8dc891">&quot;MyMessage&quot;</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token class-name" style="color:#fac863">ReactContext</span><span class="token plain"> reactContext </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">(</span><span class="token class-name" style="color:#fac863">ReactContext</span><span class="token punctuation" style="color:#657b83">)</span><span class="token function" style="color:#79b6f2">getContext</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> reactContext</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">getJSModule</span><span class="token punctuation" style="color:#657b83">(</span><span class="token class-name" style="color:#fac863">RCTEventEmitter</span><span class="token punctuation" style="color:#657b83">.</span><span class="token keyword" style="color:#c5a5c5">class</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">receiveEvent</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token function" style="color:#79b6f2">getId</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token string" style="color:#8dc891">&quot;topChange&quot;</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> event</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">}</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token punctuation" style="color:#657b83">}</span></div></div></div></div></div><p>To map the <code>topChange</code> event name to the <code>onChange</code> callback prop in JavaScript, register it by overriding the <code>getExportedCustomBubblingEventTypeConstants</code> method in your <code>ViewManager</code>:</p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-java codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">public</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">class</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">ReactImageManager</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">extends</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">SimpleViewManager</span><span class="token generics punctuation" style="color:#657b83">&lt;</span><span class="token generics class-name" style="color:#fac863">MyCustomView</span><span class="token generics punctuation" style="color:#657b83">&gt;</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">.</span><span class="token punctuation" style="color:#657b83">.</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">public</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">Map</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">getExportedCustomBubblingEventTypeConstants</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">return</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">MapBuilder</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">builder</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">put</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token string" style="color:#8dc891">&quot;topChange&quot;</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token class-name" style="color:#fac863">MapBuilder</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">of</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token string" style="color:#8dc891">&quot;phasedRegistrationNames&quot;</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token class-name" style="color:#fac863">MapBuilder</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">of</span><span class="token punctuation" style="color:#657b83">(</span><span class="token string" style="color:#8dc891">&quot;bubbled&quot;</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> </span><span class="token string" style="color:#8dc891">&quot;onChange&quot;</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">build</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">}</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token punctuation" style="color:#657b83">}</span></div></div></div></div></div><p>This callback is invoked with the raw event, which we typically process in the wrapper component to make a simpler API:</p><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token comment" style="color:#93a1a1">// MyCustomView.js</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token keyword" style="color:#c5a5c5">class</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">MyCustomView</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">extends</span><span class="token plain"> </span><span class="token class-name" style="color:#fac863">React</span><span class="token class-name punctuation" style="color:#657b83">.</span><span class="token class-name" style="color:#fac863">Component</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token function" style="color:#79b6f2">constructor</span><span class="token punctuation" style="color:#657b83">(</span><span class="token parameter">props</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">super</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">props</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">this</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">_onChange </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">this</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">_onChange</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">bind</span><span class="token punctuation" style="color:#657b83">(</span><span class="token keyword" style="color:#c5a5c5">this</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">}</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token function" style="color:#79b6f2">_onChange</span><span class="token punctuation" style="color:#657b83">(</span><span class="token parameter">event</span><span class="token parameter punctuation" style="color:#657b83">:</span><span class="token parameter"> Event</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">if</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">(</span><span class="token operator" style="color:#fc929e">!</span><span class="token keyword" style="color:#c5a5c5">this</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">props</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">onChangeMessage</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">return</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">}</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">this</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">props</span><span class="token punctuation" style="color:#657b83">.</span><span class="token function" style="color:#79b6f2">onChangeMessage</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">event</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">nativeEvent</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">message</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">}</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token function" style="color:#79b6f2">render</span><span class="token punctuation" style="color:#657b83">(</span><span class="token punctuation" style="color:#657b83">)</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">return</span><span class="token plain"> </span><span class="token tag punctuation" style="color:#657b83">&lt;</span><span class="token tag class-name" style="color:#fac863">RCTMyCustomView</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag spread punctuation" style="color:#657b83">{</span><span class="token tag spread punctuation" style="color:#657b83">...</span><span class="token tag spread attr-value" style="color:#8dc891">this</span><span class="token tag spread punctuation" style="color:#657b83">.</span><span class="token tag spread attr-value" style="color:#8dc891">props</span><span class="token tag spread punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag attr-name" style="color:#c5a5c5">onChange</span><span class="token tag script language-javascript script-punctuation punctuation" style="color:#657b83">=</span><span class="token tag script language-javascript punctuation" style="color:#657b83">{</span><span class="token tag script language-javascript keyword" style="color:#c5a5c5">this</span><span class="token tag script language-javascript punctuation" style="color:#657b83">.</span><span class="token tag script language-javascript" style="color:#fc929e">_onChange</span><span class="token tag script language-javascript punctuation" style="color:#657b83">}</span><span class="token tag" style="color:#fc929e"> </span><span class="token tag punctuation" style="color:#657b83">/&gt;</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">}</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token punctuation" style="color:#657b83">}</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain">MyCustomView</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">propTypes </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> </span><span class="token punctuation" style="color:#657b83">{</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token comment" style="color:#93a1a1">/**</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token comment" style="color:#93a1a1"> * Callback that is called continuously when the user is dragging the map.</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token comment" style="color:#93a1a1"> */</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> onChangeMessage</span><span class="token punctuation" style="color:#657b83">:</span><span class="token plain"> PropTypes</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">func</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"> </span><span class="token operator" style="color:#fc929e">...</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token punctuation" style="color:#657b83">}</span><span class="token punctuation" style="color:#657b83">;</span><span class="token plain"></span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain" style="display:inline-block">
</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token plain"></span><span class="token keyword" style="color:#c5a5c5">var</span><span class="token plain"> RCTMyCustomView </span><span class="token operator" style="color:#fc929e">=</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">requireNativeComponent</span><span class="token punctuation" style="color:#657b83">(</span><span class="token template-string template-punctuation string" style="color:#8dc891">`</span><span class="token template-string string" style="color:#8dc891">RCTMyCustomView</span><span class="token template-string template-punctuation string" style="color:#8dc891">`</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span></div></div></div></div></div></div></article><div class="docMetadata margin-vert--xl"><div class="row"><div class="col"><a href="https://github.com/facebook/react-native-website/blob/master/website/versioned_docs/version-0.62/native-components-android.md" target="_blank" rel="noreferrer noopener"><svg fill="currentColor" height="1.2em" width="1.2em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 40 40" style="margin-right:0.3em;vertical-align:sub"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col text--right"><em><small class="docMetadata-updated">Last updated on <time datetime="2020-10-29T04:19:29.000Z" class="docLastUpdatedAt_1gIo">10/29/2020</time></small></em></div></div></div><div class="margin-vert--lg"><nav class="pagination-nav" aria-label="Blog list page navigation"><div class="pagination-nav__item"><a class="pagination-nav__link" href="/docs/0.62/native-modules-android"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">« Native Modules</div></a></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/docs/0.62/headless-js-android"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Headless JS »</div></a></div></nav></div></div></div><div class="col col--3"><div class="tableOfContents_3iuQ"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#imageview-example" class="table-of-contents__link">ImageView example</a></li><li><a href="#1-create-the-viewmanager-subclass" class="table-of-contents__link">1. Create the <code>ViewManager</code> subclass</a></li><li><a href="#2-implement-method-createviewinstance" class="table-of-contents__link">2. Implement method <code>createViewInstance</code></a></li><li><a href="#3-expose-view-property-setters-using-reactprop-or-reactpropgroup-annotation" class="table-of-contents__link">3. Expose view property setters using <code>@ReactProp</code> (or <code>@ReactPropGroup</code>) annotation</a></li><li><a href="#4-register-the-viewmanager" class="table-of-contents__link">4. Register the <code>ViewManager</code></a></li><li><a href="#5-implement-the-javascript-module" class="table-of-contents__link">5. Implement the JavaScript module</a></li></ul></div></div></div></div></main></div></div><footer class="footer footer--dark"><div class="container"><div class="row footer__links"><div class="col footer__col"><h4 class="footer__title">Docs</h4><ul class="footer__items"><li class="footer__item"><a class="footer__link-item" href="/docs/getting-started">Getting Started</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/tutorial">Tutorial</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/components-and-apis">Components and APIs</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/more-resources">More Resources</a></li></ul></div><div class="col footer__col"><h4 class="footer__title">Community</h4><ul class="footer__items"><li class="footer__item"><a class="footer__link-item" href="/help">The React Native Community</a></li><li class="footer__item"><a class="footer__link-item" href="/showcase">Who&#x27;s using React Native?</a></li><li class="footer__item"><a href="https://stackoverflow.com/questions/tagged/react-native" target="_blank" rel="noopener noreferrer" class="footer__link-item">Ask Questions on Stack Overflow</a></li><li class="footer__item"><a href="https://github.com/facebook/react-native/blob/master/CONTRIBUTING.md" target="_blank" rel="noopener noreferrer" class="footer__link-item">Contributor Guide</a></li><li class="footer__item"><a href="https://dev.to/t/reactnative" target="_blank" rel="noopener noreferrer" class="footer__link-item">DEV Community</a></li></ul></div><div class="col footer__col"><h4 class="footer__title">Find us</h4><ul class="footer__items"><li class="footer__item"><a class="footer__link-item" href="/blog">Blog</a></li><li class="footer__item"><a href="https://twitter.com/reactnative" target="_blank" rel="noopener noreferrer" class="footer__link-item">Twitter</a></li><li class="footer__item"><a href="https://github.com/facebook/react-native" target="_blank" rel="noopener noreferrer" class="footer__link-item">GitHub</a></li></ul></div><div class="col footer__col"><h4 class="footer__title">More</h4><ul class="footer__items"><li class="footer__item"><a href="https://reactjs.org/" target="_blank" rel="noopener noreferrer" class="footer__link-item">React</a></li><li class="footer__item"><a href="https://opensource.facebook.com/legal/privacy" target="_blank" rel="noopener noreferrer" class="footer__link-item">Privacy Policy</a></li><li class="footer__item"><a href="https://opensource.facebook.com/legal/terms" target="_blank" rel="noopener noreferrer" class="footer__link-item">Terms of Service</a></li></ul></div></div><div class="text--center"><div class="margin-bottom--sm"><a href="https://opensource.facebook.com" target="_blank" rel="noopener noreferrer" class="footerLogoLink_19Ac"><img class="footer__logo" alt="Facebook Open Source Logo" src="/img/oss_logo.png"></a></div><div>Copyright © 2020 Facebook, Inc.</div></div></div></footer></div>
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