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1<!doctype html><html lang=en dir=ltr class="docs-wrapper plugin-docs plugin-id-default docs-version-0.79 docs-doc-page docs-doc-id-integration-with-android-fragment" data-has-hydrated=false><meta charset=UTF-8><meta name=generator content="Docusaurus v3.8.0"><title data-rh=true>Integration with an Android Fragment · React Native</title><meta data-rh=true name=viewport content="width=device-width, initial-scale=1.0"><meta data-rh=true property=og:url content=https://reactnative.dev/docs/integration-with-android-fragment><meta data-rh=true property=og:locale content=en><meta data-rh=true name=docusaurus_locale content=en><meta data-rh=true name=docsearch:language content=en><meta data-rh=true property=og:image content=https://reactnative.dev/img/logo-share.png><meta data-rh=true name=twitter:card content=summary_large_image><meta data-rh=true name=twitter:image content=https://reactnative.dev/img/logo-share.png><meta data-rh=true name=twitter:site content=@reactnative><meta data-rh=true 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href=/docs/legacy/native-modules-intro>Legacy Architecture</a></div></ul></nav></div></div></aside><main class=docMainContainer_a9sJ><div class="container padding-top--md padding-bottom--lg"><div class=row><div class="col docItemCol_Qr34"><div class=docItemContainer_tjFy><article><div class="tocCollapsible_wXna theme-doc-toc-mobile tocMobile_Ojys"><button type=button class="clean-btn tocCollapsibleButton_iI2p">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Integration with an Android Fragment</h1></header><p>The guide for <a href=https://reactnative.dev/docs/integration-with-existing-apps target=_blank rel="noopener noreferrer">Integration with Existing Apps</a> details how to integrate a full-screen React Native app into an existing Android app as an <strong>Activity</strong>.</p> 5<p>To use React Native components within <strong>Fragments</strong> in an existing app requires some additional setup.</p> 6<h3 class="anchor anchorWithStickyNavbar_JmGV" id=1-add-react-native-to-your-app>1. Add React Native to your app<a href=#1-add-react-native-to-your-app class=hash-link aria-label="Direct link to 1. Add React Native to your app" title="Direct link to 1. Add React Native to your app">​</a></h3> 7<p>Follow the guide for <a href=https://reactnative.dev/docs/integration-with-existing-apps target=_blank rel="noopener noreferrer">Integration with Existing Apps</a> until the end to make sure you can safely run your React Native app in a full screen Activity.</p> 8<h3 class="anchor anchorWithStickyNavbar_JmGV" id=2-add-a-framelayout-for-the-react-native-fragment>2. Add a FrameLayout for the React Native Fragment<a href=#2-add-a-framelayout-for-the-react-native-fragment class=hash-link aria-label="Direct link to 2. Add a FrameLayout for the React Native Fragment" title="Direct link to 2. Add a FrameLayout for the React Native Fragment">​</a></h3> 9<p>In this example, we're going to use a <code>FrameLayout</code> to add a React Native Fragment to an Activity. This approach is flexible enough and can be adapted to use React Native in other layouts such as Bottom Sheets or Tab Layouts.</p> 10<p>First add a <code>&lt;FrameLayout></code> with an id, width and height to your Activity's layout (e.g. <code>main_activity.xml</code> in the <code>res/layouts</code> folder). This is the layout you will find to render your React Native Fragment.</p> 11<div class="language-xml codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>xml</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-xml codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token tag punctuation" style=color:#657b83>&lt;</span><span class="token tag" style=color:#fc929e>FrameLayout</span><span class="token tag" style=color:#fc929e></span><br></span><span class=token-line style=color:#FFFFFF><span class="token tag" style=color:#fc929e> </span><span class="token tag attr-name namespace" style=color:#c5a5c5;opacity:0.7>android:</span><span class="token tag attr-name" style=color:#c5a5c5>id</span><span class="token tag attr-value punctuation attr-equals" style=color:#657b83>=</span><span class="token tag attr-value punctuation" style=color:#657b83>"</span><span class="token tag attr-value" style=color:#8dc891>@+id/react_native_fragment</span><span class="token tag attr-value punctuation" style=color:#657b83>"</span><span class="token tag" style=color:#fc929e></span><br></span><span class=token-line style=color:#FFFFFF><span class="token tag" style=color:#fc929e> </span><span class="token tag attr-name namespace" style=color:#c5a5c5;opacity:0.7>android:</span><span class="token tag attr-name" style=color:#c5a5c5>layout_width</span><span class="token tag attr-value punctuation attr-equals" style=color:#657b83>=</span><span class="token tag attr-value punctuation" style=color:#657b83>"</span><span class="token tag attr-value" style=color:#8dc891>match_parent</span><span class="token tag attr-value punctuation" style=color:#657b83>"</span><span class="token tag" style=color:#fc929e></span><br></span><span class=token-line style=color:#FFFFFF><span class="token tag" style=color:#fc929e> </span><span class="token tag attr-name namespace" style=color:#c5a5c5;opacity:0.7>android:</span><span class="token tag attr-name" style=color:#c5a5c5>layout_height</span><span class="token tag attr-value punctuation attr-equals" style=color:#657b83>=</span><span class="token tag attr-value punctuation" style=color:#657b83>"</span><span class="token tag attr-value" style=color:#8dc891>match_parent</span><span class="token tag attr-value punctuation" style=color:#657b83>"</span><span class="token tag" style=color:#fc929e> </span><span class="token tag punctuation" style=color:#657b83>/></span><br></span></code></pre></div></div> 12<h3 class="anchor anchorWithStickyNavbar_JmGV" id=3-make-your-host-activity-implement-defaulthardwarebackbtnhandler>3. Make your host Activity implement <code>DefaultHardwareBackBtnHandler</code><a href=#3-make-your-host-activity-implement-defaulthardwarebackbtnhandler class=hash-link aria-label="Direct link to 3-make-your-host-activity-implement-defaulthardwarebackbtnhandler" title="Direct link to 3-make-your-host-activity-implement-defaulthardwarebackbtnhandler">​</a></h3> 13<p>As your host activity is not a <code>ReactActivity</code>, you need to implement the <code>DefaultHardwareBackBtnHandler</code> interface to handle the back button press event. 14This is required by React Native to handle the back button press event.</p> 15<p>Go into your host activity and make sure it implements the <code>DefaultHardwareBackBtnHandler</code> interface:</p> 16<div class="tabs-container tabList_J5MA"><ul role=tablist aria-orientation=horizontal class=tabs><li role=tab tabindex=0 aria-selected=true class="tabs__item tabItem_l0OV tabs__item--active">Java<li role=tab tabindex=-1 aria-selected=false class="tabs__item tabItem_l0OV">Kotlin</ul><div class=margin-top--md><div role=tabpanel class=tabItem_wHwb hidden><div class="language-diff codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>diff</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-diff codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token plain">package &lt;your-package-here></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain" style=display:inline-block></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain">import android.os.Bundle</span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain">import androidx.appcompat.app.AppCompatActivity</span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900>import com.facebook.react.modules.core.DefaultHardwareBackBtnHandler</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900>class MainActivity : AppCompatActivity() {</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900>class MainActivity : AppCompatActivity(), DefaultHardwareBackBtnHandler {</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> override fun onCreate(savedInstanceState: Bundle?) {</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> super.onCreate(savedInstanceState)</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> setContentView(R.layout.main_activity)</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> findViewById&lt;Button>(R.id.sample_button).setOnClickListener {</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> // Handle button click</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> }</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> }</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> override fun invokeDefaultOnBackPressed() {</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> super.onBackPressed()</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> }</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token plain">}</span><br></span></code></pre></div></div></div><div role=tabpanel class=tabItem_wHwb><div class="language-diff codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>diff</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-diff codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token plain">package &lt;your-package-here>;</span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain" style=display:inline-block></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain">import android.os.Bundle;</span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain">import androidx.appcompat.app.AppCompatActivity;</span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900>import com.facebook.react.modules.core.DefaultHardwareBackBtnHandler;</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token deleted-sign deleted prefix deleted" style=color:#cb4b16>-</span><span class="token deleted-sign deleted line" style=color:#cb4b16>class MainActivity extends AppCompatActivity {</span><br></span><span class=token-line style=color:#FFFFFF><span class="token deleted-sign deleted line" style=color:#cb4b16></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900>class MainActivity extends AppCompatActivity implements DefaultHardwareBackBtnHandler {</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> @Override</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> protected void onCreate(@Nullable Bundle savedInstanceState) {</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> super.onCreate(savedInstanceState);</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> setContentView(R.layout.main_activity);</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> findViewById(R.id.button_appcompose).setOnClickListener(button -> {</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> // Handle button click</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> });</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> }</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> @Override</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> public void invokeDefaultOnBackPressed() {</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> super.onBackPressed();</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> }</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token plain">}</span><br></span></code></pre></div></div></div></div></div> 17<h3 class="anchor anchorWithStickyNavbar_JmGV" id=4-add-a-react-native-fragment-to-the-framelayout>4. Add a React Native Fragment to the FrameLayout<a href=#4-add-a-react-native-fragment-to-the-framelayout class=hash-link aria-label="Direct link to 4. Add a React Native Fragment to the FrameLayout" title="Direct link to 4. Add a React Native Fragment to the FrameLayout">​</a></h3> 18<p>Finally, we can update the Activity to add a React Native Fragment to the FrameLayout. 19In this specific example, we're going to assume that your Activity has a button with id <code>sample_button</code> that when clicked will render a React Native Fragment into the FrameLayout.</p> 20<p>Update your Activity's <code>onCreate</code> method as follows:</p> 21<div class="tabs-container tabList_J5MA"><ul role=tablist aria-orientation=horizontal class=tabs><li role=tab tabindex=0 aria-selected=true class="tabs__item tabItem_l0OV tabs__item--active">Java<li role=tab tabindex=-1 aria-selected=false class="tabs__item tabItem_l0OV">Kotlin</ul><div class=margin-top--md><div role=tabpanel class=tabItem_wHwb hidden><div class="language-diff codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>diff</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-diff codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token plain">package &lt;your-package-here></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain" style=display:inline-block></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain">import android.os.Bundle</span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain">import androidx.appcompat.app.AppCompatActivity</span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900>import com.facebook.react.ReactFragment</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token plain">import com.facebook.react.modules.core.DefaultHardwareBackBtnHandler</span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain" style=display:inline-block></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain">public class MainActivity : AppCompatActivity(), DefaultHardwareBackBtnHandler {</span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain" style=display:inline-block></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> override fun onCreate(savedInstanceState: Bundle?) {</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> super.onCreate(savedInstanceState)</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> setContentView(R.layout.main_activity)</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> findViewById&lt;Button>(R.id.sample_button).setOnClickListener {</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> val reactNativeFragment = ReactFragment.Builder()</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> .setComponentName("HelloWorld")</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> .setLaunchOptions(Bundle().apply { putString("message", "my value") })</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> .build()</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> supportFragmentManager</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> .beginTransaction()</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> .add(R.id.react_native_fragment, reactNativeFragment)</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> .commit()</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> }</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> }</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> override fun invokeDefaultOnBackPressed() {</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> super.onBackPressed()</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> }</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token plain">}</span><br></span></code></pre></div></div></div><div role=tabpanel class=tabItem_wHwb><div class="language-diff codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>diff</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-diff codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token plain">package &lt;your-package-here>;</span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain" style=display:inline-block></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain">import android.os.Bundle;</span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain">import androidx.appcompat.app.AppCompatActivity;</span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900>import com.facebook.react.ReactFragment;</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token plain">import com.facebook.react.modules.core.DefaultHardwareBackBtnHandler;</span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain" style=display:inline-block></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain">public class MainActivity extends AppCompatActivity implements DefaultHardwareBackBtnHandler {</span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain" style=display:inline-block></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> @Override</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> protected void onCreate(@Nullable Bundle savedInstanceState) {</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> super.onCreate(savedInstanceState);</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> setContentView(R.layout.main_activity);</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> findViewById(R.id.button_appcompose).setOnClickListener(button -> {</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> Bundle launchOptions = new Bundle();</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> launchOptions.putString("message", "my value");</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900></span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> ReactFragment fragment = new ReactFragment.Builder()</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> .setComponentName("HelloWorld")</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> .setLaunchOptions(launchOptions)</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> .build();</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> getSupportFragmentManager()</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> .beginTransaction()</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> .add(R.id.react_native_fragment, fragment)</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token inserted-sign inserted prefix inserted" style=color:#859900>+</span><span class="token inserted-sign inserted line" style=color:#859900> .commit();</span><br></span><span class=token-line style=color:#FFFFFF><span class="token inserted-sign inserted line" style=color:#859900></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> });</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> }</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> @Override</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> public void invokeDefaultOnBackPressed() {</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> super.onBackPressed();</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token unchanged prefix unchanged"> </span><span class="token unchanged line"> }</span><br></span><span class=token-line style=color:#FFFFFF><span class="token unchanged line"></span><span class="token plain">}</span><br></span></code></pre></div></div></div></div></div> 22<p>Let's look at the code above.</p> 23<p>The <code>ReactFragment.Builder()</code> is used to create a new <code>ReactFragment</code> and then we use the <code>supportFragmentManager</code> to add that Fragment to the <code>FrameLayout</code>.</p> 24<p>Inside the builder you can customize how the fragment is created:</p> 25<ul> 26<li><code>setComponentName</code> is the name of the component you want to render. It's the same string specified in your <code>index.js</code> inside the <code>registerComponent</code> method.</li> 27<li><code>setLaunchOptions</code> is an optional method to pass initial props to your component. This is optional and you can remove it if you don't use it.</li> 28</ul> 29<h3 class="anchor anchorWithStickyNavbar_JmGV" id=5-test-your-integration>5. Test your integration<a href=#5-test-your-integration class=hash-link aria-label="Direct link to 5. Test your integration" title="Direct link to 5. Test your integration">​</a></h3> 30<p>Make sure you run <code>yarn start</code> to run the bundler and then run your android app in Android Studio. The app should load the JavaScript/TypeScript code from the development server and display it in your React Native Fragment in the Activity.</p> 31<p>Your app should look like this one:</p> 32<p><img decoding=async loading=lazy alt=Screenshot src=/assets/images/EmbeddedAppAndroidFragmentVideo-82fb8da16f6e27f6ce948561c0185589.gif width=720 height=1280 class=img_SS3x></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class=editButtons_t0bR><a href=https://github.com/facebook/react-native-website/edit/main/docs/integration-with-android-fragment.md target=_blank rel="noopener noreferrer" class=theme-edit-this-page><svg fill=currentColor height=20 width=20 viewBox="0 0 40 40" class=iconEdit_bHB7 aria-hidden=true><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"/></g></svg>Edit page for next release</a><a href=https://github.com/facebook/react-native-website/edit/main/website/versioned_docs/version-0.79/integration-with-android-fragment.md target=_blank rel="noopener noreferrer" class=theme-edit-this-page><svg fill=currentColor height=20 width=20 viewBox="0 0 40 40" class=iconEdit_bHB7 aria-hidden=true><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"/></g></svg>Edit page for current release</a></div><div class=lastUpdated_VsjB><span class=theme-last-updated>Last updated<!-- --> on <b><time datetime=2025-04-14T14:14:17.000Z itemprop=dateModified>Apr 14, 2025</time></b></span></div></div></footer></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href=/docs/integration-with-existing-apps><div class=pagination-nav__sublabel>Previous</div><div class=pagination-nav__label>Integration with Existing Apps</div></a><a class="pagination-nav__link pagination-nav__link--next" href=/docs/building-for-tv><div class=pagination-nav__sublabel>Next</div><div class=pagination-nav__label>Building For TV Devices</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_XG6w thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href=#1-add-react-native-to-your-app class="table-of-contents__link toc-highlight">1. Add React Native to your app</a><li><a href=#2-add-a-framelayout-for-the-react-native-fragment class="table-of-contents__link toc-highlight">2. Add a FrameLayout for the React Native Fragment</a><li><a href=#3-make-your-host-activity-implement-defaulthardwarebackbtnhandler class="table-of-contents__link toc-highlight">3. Make your host Activity implement <code>DefaultHardwareBackBtnHandler</code></a><li><a href=#4-add-a-react-native-fragment-to-the-framelayout class="table-of-contents__link toc-highlight">4. Add a React Native Fragment to the FrameLayout</a><li><a href=#5-test-your-integration class="table-of-contents__link toc-highlight">5. 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