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docs/backhandler.html

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 <script src="https://snack.expo.io/embed.js" defer="defer"></script><title data-react-helmet="true">BackHandler · 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="BackHandler · React Native"><meta data-react-helmet="true" name="description" content="The Backhandler API detects hardware button presses for back navigation, lets you register event listeners for the system&#x27;s back action, and lets you control how your application responds. It is Android-only."><meta data-react-helmet="true" property="og:description" content="The Backhandler API detects hardware button presses for back navigation, lets you register event listeners for the system&#x27;s back action, and lets you control how your application responds. It is Android-only."><meta data-react-helmet="true" property="og:url" content="https://reactnative.dev/docs/backhandler"><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/backhandler"><link rel="stylesheet" href="/styles.fccefeba.css">
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 </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 function" style="color:#79b6f2">onMainScreen</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 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 function" style="color:#79b6f2">goBack</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 comment" style="color:#93a1a1">/**</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token comment" style="color:#93a1a1">     * When true is returned the event will not be bubbled up</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token comment" style="color:#93a1a1">     * &amp; no other back action will execute</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">    </span><span class="token keyword" style="color:#c5a5c5">return</span><span class="token plain"> </span><span class="token boolean" style="color:#ff8b50">true</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 comment" style="color:#93a1a1">/**</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token comment" style="color:#93a1a1">   * Returning false will let the event to bubble up &amp; let other event listeners</span></div><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token comment" style="color:#93a1a1">   * or the system&#x27;s default back action to be executed.</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">  </span><span class="token keyword" style="color:#c5a5c5">return</span><span class="token plain"> </span><span class="token boolean" style="color:#ff8b50">false</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></div></div></div></div></div><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="example"></a>Example<a aria-hidden="true" tabindex="-1" class="hash-link" href="#example" title="Direct link to heading">#</a></h2><p>The following example implements a scenario where you confirm if the user wants to exit the app:</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="BackHandler" data-snack-description="Example usage" data-snack-code="import%20React%2C%20%7B%20useEffect%20%7D%20from%20%22react%22%3B%0Aimport%20%7B%20Text%2C%20View%2C%20StyleSheet%2C%20BackHandler%2C%20Alert%20%7D%20from%20%22reLine truncated
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