fix(native): enable Android media projection foreground service

native-app/android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,33 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+  <uses-permission android:name="android.permission.INTERNET"/>
+  <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
+  <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MEDIA_PROJECTION"/>
+  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
+  <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
+  <uses-permission android:name="android.permission.VIBRATE"/>
+  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+  <queries>
+    <intent>
+      <action android:name="android.intent.action.VIEW"/>
+      <category android:name="android.intent.category.BROWSABLE"/>
+      <data android:scheme="https"/>
+    </intent>
+  </queries>
+  <application android:name=".MainApplication" android:label="@string/app_name" android:icon="@mipmap/ic_launcher" android:roundIcon="@mipmap/ic_launcher_round" android:allowBackup="true" android:theme="@style/AppTheme" android:supportsRtl="true" android:enableOnBackInvokedCallback="false" android:fullBackupContent="@xml/secure_store_backup_rules" android:dataExtractionRules="@xml/secure_store_data_extraction_rules">
+    <meta-data android:name="expo.modules.updates.ENABLED" android:value="false"/>
+    <meta-data android:name="expo.modules.updates.EXPO_UPDATES_CHECK_ON_LAUNCH" android:value="ALWAYS"/>
+    <meta-data android:name="expo.modules.updates.EXPO_UPDATES_LAUNCH_WAIT_MS" android:value="0"/>
+    <activity android:name=".MainActivity" android:configChanges="keyboard|keyboardHidden|orientation|screenSize|screenLayout|uiMode" android:launchMode="singleTask" android:windowSoftInputMode="adjustResize" android:theme="@style/Theme.App.SplashScreen" android:exported="true" android:screenOrientation="portrait">
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN"/>
+        <category android:name="android.intent.category.LAUNCHER"/>
+      </intent-filter>
+      <intent-filter>
+        <action android:name="android.intent.action.VIEW"/>
+        <category android:name="android.intent.category.DEFAULT"/>
+        <category android:name="android.intent.category.BROWSABLE"/>
+        <data android:scheme="heliumnative"/>
+      </intent-filter>
+    </activity>
+  </application>
+</manifest>

native-app/android/app/src/main/java/dev/srizan/helium/viewer/MainActivity.kt

@@ -0,0 +1,66 @@
+package dev.srizan.helium.viewer
+
+import android.os.Build
+import android.os.Bundle
+
+import com.facebook.react.ReactActivity
+import com.facebook.react.ReactActivityDelegate
+import com.facebook.react.defaults.DefaultNewArchitectureEntryPoint.fabricEnabled
+import com.facebook.react.defaults.DefaultReactActivityDelegate
+import com.oney.WebRTCModule.WebRTCModuleOptions
+
+import expo.modules.ReactActivityDelegateWrapper
+
+class MainActivity : ReactActivity() {
+  override fun onCreate(savedInstanceState: Bundle?) {
+    // Set the theme to AppTheme BEFORE onCreate to support
+    // coloring the background, status bar, and navigation bar.
+    // This is required for expo-splash-screen.
+    setTheme(R.style.AppTheme);
+
+    val webrtcOptions = WebRTCModuleOptions.getInstance()
+    webrtcOptions.enableMediaProjectionService = true
+
+    super.onCreate(null)
+  }
+
+  /**
+   * Returns the name of the main component registered from JavaScript. This is used to schedule
+   * rendering of the component.
+   */
+  override fun getMainComponentName(): String = "main"
+
+  /**
+   * Returns the instance of the [ReactActivityDelegate]. We use [DefaultReactActivityDelegate]
+   * which allows you to enable New Architecture with a single boolean flags [fabricEnabled]
+   */
+  override fun createReactActivityDelegate(): ReactActivityDelegate {
+    return ReactActivityDelegateWrapper(
+          this,
+          BuildConfig.IS_NEW_ARCHITECTURE_ENABLED,
+          object : DefaultReactActivityDelegate(
+              this,
+              mainComponentName,
+              fabricEnabled
+          ){})
+  }
+
+  /**
+    * Align the back button behavior with Android S
+    * where moving root activities to background instead of finishing activities.
+    * @see <a href="https://developer.android.com/reference/android/app/Activity#onBackPressed()">onBackPressed</a>
+    */
+  override fun invokeDefaultOnBackPressed() {
+      if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.R) {
+          if (!moveTaskToBack(false)) {
+              // For non-root activities, use the default implementation to finish them.
+              super.invokeDefaultOnBackPressed()
+          }
+          return
+      }
+
+      // Use the default back button implementation on Android S
+      // because it's doing more than [Activity.moveTaskToBack] in fact.
+      super.invokeDefaultOnBackPressed()
+  }
+}

native-app/src/hooks/useHeliumStreamer.ts

@@ -239,6 +239,13 @@ export function useHeliumStreamer(
 
     const videoTrackCount = stream.getVideoTracks().length;
     const audioTrackCount = stream.getAudioTracks().length;
+
+    if (!videoTrackCount) {
+      setStatus("screen capture started without video track");
+      stopSharing();
+      return;
+    }
+
     setStatus(`capturing ${videoTrackCount} video / ${audioTrackCount} audio tracks`);
 
     stream.getTracks().forEach((track) => {

native-app/src/screens/StreamerScreen.tsx

@@ -151,7 +151,13 @@ export function StreamerScreen() {
 
         <View style={styles.preview}>
           {isSharing && streamUrl ? (
-            <RTCView mirror={false} objectFit="contain" streamURL={streamUrl} style={styles.video} />
+            <RTCView
+              mirror={false}
+              objectFit="cover"
+              streamURL={streamUrl}
+              style={styles.video}
+              zOrder={0}
+            />
           ) : (
             <Text style={styles.previewPlaceholder}>Screen preview appears after sharing starts</Text>
           )}