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<script src="https://snack.expo.io/embed.js" defer="defer"></script><title data-react-helmet="true">AppState · React Native</title><meta data-react-helmet="true" property="twitter:image" content="https://reactnative.dev/img/logo-og.png"><meta data-react-helmet="true" name="twitter:image:alt" content="Image for React Native"><meta data-react-helmet="true" name="docsearch:language" content="en"><meta data-react-helmet="true" name="docsearch:version" content="0.63"><meta data-react-helmet="true" name="docsearch:docusaurus_tag" content="docs-default-0.63"><meta data-react-helmet="true" property="og:image" content="https://reactnative.dev/img/logo-og.png"><meta data-react-helmet="true" name="twitter:card" content="summary"><meta data-react-helmet="true" name="twitter:image" content="https://reactnative.dev/img/logo-og.png"><meta data-react-helmet="true" property="og:title" content="AppState · React Native"><meta data-react-helmet="true" name="description" content="AppState can tell you if the app is in the foreground or background, and notify you when the state changes."><meta data-react-helmet="true" property="og:description" content="AppState can tell you if the app is in the foreground or background, and notify you when the state changes."><meta data-react-helmet="true" property="og:url" content="https://reactnative.dev/docs/appstate"><link data-react-helmet="true" rel="shortcut icon" href="/img/favicon.ico"><link data-react-helmet="true" rel="preconnect" href="https://BH4D9OD16A-dsn.algolia.net" crossorigin="anonymous"><link data-react-helmet="true" rel="canonical" href="https://reactnative.dev/docs/appstate"><link rel="stylesheet" href="/styles.fccefeba.css">
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class="menu__link menu__link--sublist" href="#!" tabindex="0">iOS APIs</a><ul class="menu__list"><li class="menu__list-item"><a class="menu__link" tabindex="0" href="/docs/actionsheetios">ActionSheetIOS</a></li><li class="menu__list-item"><a class="menu__link" tabindex="0" href="/docs/dynamiccolorios">DynamicColorIOS</a></li><li class="menu__list-item"><a class="menu__link" tabindex="0" href="/docs/settings">Settings</a></li></ul></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="docItemContainer_1tAC"><article><header><h1 class="docTitle_cWlf">AppState</h1></header><div class="markdown"><p><code>AppState</code> can tell you if the app is in the foreground or background, and notify you when the state changes.</p><p>AppState is frequently used to determine the intent and proper behavior when handling push notifications.</p><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="app-states"></a>App States<a aria-hidden="true" tabindex="-1" class="hash-link" href="#app-states" title="Direct link to heading">#</a></h3><ul><li><code>active</code> - The app is running in the foreground</li><li><code>background</code> - The app is running in the background. The user is either:<ul><li>in another app</li><li>on the home screen</li><li>[Android] on another <code>Activity</code> (even if it was launched by your app)</li></ul></li><li>[iOS] <code>inactive</code> - This is a state that occurs when transitioning between foreground & background, and during periods of inactivity such as entering the Multitasking view or in the event of an incoming call</li></ul><p>For more information, see <a href="https://developer.apple.com/documentation/uikit/app_and_scenes/managing_your_app_s_life_cycle" target="_blank" rel="noopener noreferrer">Apple's documentation</a></p><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="basic-usage"></a>Basic Usage<a aria-hidden="true" tabindex="-1" class="hash-link" href="#basic-usage" title="Direct link to heading">#</a></h2><p>To see the current state, you can check <code>AppState.currentState</code>, which will be kept up-to-date. However, <code>currentState</code> will be null at launch while <code>AppState</code> retrieves it over the bridge.</p><div><ul role="tablist" aria-orientation="horizontal" class="tabs"><li role="tab" tabindex="0" aria-selected="true" class="tabs__item tabItem_3gSF tabs__item--active" style="outline:none">Function Component</li><li role="tab" tabindex="0" aria-selected="false" class="tabs__item tabItem_3gSF" style="outline:none">Class Component</li></ul><div role="tabpanel" class="margin-vert--md"><div><div class="snack-player" data-snack-name="AppState Function Component Example" data-snack-description="Example usage" data-snack-code="import%20React%2C%20%7B%20useRef%2C%20useState%2C%20useEffect%20%7D%20from%20%22react%22%3B%0Aimport%20%7B%20AppState%2C%20StyleSheet%2C%20Text%2C%20View%20%7D%20from%20%22react-native%22%3B%0A%0Aconst%20AppStateExample%20%3D%20()%20%3D%3E%20%7B%0A%20%20const%20appState%20%3D%20useRef(AppState.currentState)%3B%0A%20%20const%20%5BappStateVisible%2C%20setAppStateVisible%5D%20%3D%20useState(appState.current)%3B%0A%0A%20%20useEffect(()%20%3D%3E%20%7B%0A%20%20%20%20AppState.addEventListener(%22change%22%2C%20_handleAppStateChange)%3B%0A%0A%20%20%20%20return%20()%20%3D%3E%20%7B%0A%20%20%20%20%20%20AppState.removeEventListener(%22change%22%2C%20_handleAppStateChange)%3B%0A%20%20%20%20%7D%3B%0A%20%20%7D%2C%20%5B%5D)%3B%0A%0A%20%20const%20_handleAppStateChange%20%3D%20(nextAppState)%20%3D%3E%20%7B%0A%20%20%20%20if%20(%0A%20%20%20%20%20%20appState.current.match(%2Finactive%7Cbackground%2F)%20%26%26%0A%20%20%20%20%20%20nextAppState%20%3D%3D%3D%20%22active%22%0A%20%20%20%20)%20%7B%0A%20%20%20%20%20%20console.log(%22App%20has%20come%20to%20the%20foreground!%22)%3B%0A%20%20%20%20%7D%0A%0A%20%20%20%20appState.current%20%3D%20nextAppState%3B%0A%20%20%20%20setAppStateVisible(appState.current)%3B%0A%20%20%20%20console.log(%22AppState%22%2C%20appState.current)%3B%0A%20%20%7D%3B%0A%0A%20%20return%20(%0A%20%20%20%20%3CView%20style%3D%7Bstyles.container%7D%3E%0A%20%20%20%20%20%20%3CText%3ECurrent%20state%20is%3A%20%7BappStateVisible%7D%3C%2FText%3E%0A%20%20%20%20%3C%2FView%3E%0A%20%20)%3B%0A%7D%3B%0A%0Aconst%20styles%20%3D%20StyleSheet.create(%7B%0A%20%20container%3A%20%7B%0A%20%20%20%20flex%3A%201%2C%0A%20%20%20%20justifyContent%3A%20%22center%22%2C%0A%20%20%20%20alignItems%3A%20%22center%22%2C%0A%20%20%7D%2C%0A%7D)%3B%0A%0Aexport%20default%20AppStateExample%3B" data-snack-platform="web" data-snack-supported-platforms="ios,android,web" data-snack-theme="light" data-snack-preview="true"></div><p>If you don't want to see the AppState update from <code>active</code> to <code>inactive</code> on iOS you can remove the state variable and use the <code>appState.current</code> value.</p></div></div></div><p>This example will only ever appear to say "Current state is: active" because the app is only visible to the user when in the <code>active</code> state, and the null state will happen only momentarily. If you want to experiment with the code we recommend to use your own device instead of embedded preview.</p><hr><h1><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="reference"></a>Reference<a aria-hidden="true" tabindex="-1" class="hash-link" href="#reference" title="Direct link to heading">#</a></h1><h2><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></h2><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="change"></a><code>change</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#change" title="Direct link to heading">#</a></h3><p>This event is received when the app state has changed. The listener is called with one of <a href="/docs/appstate#app-states">the current app state values</a>.</p><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="memorywarning"></a><code>memoryWarning</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#memorywarning" title="Direct link to heading">#</a></h3><p>This event is used in the need of throwing memory warning or releasing it.</p><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="focus"></a><code>focus</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#focus" title="Direct link to heading">#</a></h3><p>[Android only] Received when the app gains focus (the user is interacting with the app).</p><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="blur"></a><code>blur</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#blur" title="Direct link to heading">#</a></h3><p>[Android only] Received when the user is not actively interacting with the app. Useful in situations when the user pulls down the <a href="https://developer.android.com/guide/topics/ui/notifiers/notifications#bar-and-drawer" target="_blank" rel="noopener noreferrer">notification drawer</a>. <code>AppState</code> won't change but the <code>blur</code> event will get fired.</p><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="methods"></a>Methods<a aria-hidden="true" tabindex="-1" class="hash-link" href="#methods" title="Direct link to heading">#</a></h2><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="addeventlistener"></a><code>addEventListener()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#addeventlistener" title="Direct link to heading">#</a></h3><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 function" style="color:#79b6f2">addEventListener</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">type</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> handler</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span></div></div></div></div></div><p>Add a handler to AppState changes by listening to the <code>change</code> event type and providing the handler</p><p>TODO: now that AppState is a subclass of NativeEventEmitter, we could deprecate <code>addEventListener</code> and <code>removeEventListener</code> and use <code>addListener</code> and <code>listener.remove()</code> directly. That will be a breaking change though, as both the method and event names are different (addListener events are currently required to be globally unique).</p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="removeeventlistener"></a><code>removeEventListener()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#removeeventlistener" title="Direct link to heading">#</a></h3><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 function" style="color:#79b6f2">removeEventListener</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">type</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> handler</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span></div></div></div></div></div><p>Remove a handler by passing the <code>change</code> event type and the handler</p><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="properties"></a>Properties<a aria-hidden="true" tabindex="-1" class="hash-link" href="#properties" title="Direct link to heading">#</a></h2><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="currentstate"></a><code>currentState</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#currentstate" title="Direct link to heading">#</a></h3><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 plain">AppState</span><span class="token punctuation" style="color:#657b83">.</span><span class="token plain">currentState</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-0.63/appstate.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/appregistry"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">« AppRegistry</div></a></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/docs/devsettings"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">DevSettings »</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="#app-states" class="table-of-contents__link">App States</a></li><li><a href="#basic-usage" class="table-of-contents__link">Basic Usage</a></li><li><a href="#events" class="table-of-contents__link">Events</a><ul><li><a href="#change" class="table-of-contents__link"><code>change</code></a></li><li><a href="#memorywarning" class="table-of-contents__link"><code>memoryWarning</code></a></li><li><a href="#focus" class="table-of-contents__link"><code>focus</code></a></li><li><a href="#blur" class="table-of-contents__link"><code>blur</code></a></li></ul></li><li><a href="#methods" class="table-of-contents__link">Methods</a><ul><li><a href="#addeventlistener" class="table-of-contents__link"><code>addEventListener()</code></a></li><li><a href="#removeeventlistener" class="table-of-contents__link"><code>removeEventListener()</code></a></li></ul></li><li><a href="#properties" class="table-of-contents__link">Properties</a><ul><li><a href="#currentstate" class="table-of-contents__link"><code>currentState</code></a></li></ul></li></ul></div></div></div></div></main></div></div><footer 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