Add build config plugin to set .MainActivity launchMode

app.config.js

@@ -204,6 +204,7 @@ module.exports = function (config) {
         ],
         './plugins/withAndroidManifestPlugin.js',
         './plugins/withAndroidManifestFCMIconPlugin.js',
+        './plugins/withAndroidManifestLaunchModePlugin.js',
         './plugins/withAndroidStylesWindowBackgroundPlugin.js',
         './plugins/withAndroidStylesAccentColorPlugin.js',
         './plugins/withAndroidSplashScreenStatusBarTranslucentPlugin.js',

plugins/withAndroidManifestLaunchModePlugin.js

@@ -0,0 +1,18 @@
+const {withAndroidManifest} = require('expo/config-plugins')
+
+module.exports = function withAndroidManifestLaunchModePlugin(appConfig) {
+  return withAndroidManifest(appConfig, function (decoratedAppConfig) {
+    try {
+      const mainApplication =
+        decoratedAppConfig.modResults.manifest.application[0]
+      const mainActivity = mainApplication.activity.find(
+        elem => elem.$['android:name'] === '.MainActivity',
+      )
+
+      mainActivity.$['android:launchMode'] = 'singleTop'
+    } catch (e) {
+      console.error(`withAndroidManifestLaunchModePlugin failed`, e)
+    }
+    return decoratedAppConfig
+  })
+}