chore(🤖): give the example app its own Android application id

.github/workflows/agent.yml

@@ -244,7 +244,7 @@ jobs:
       METRO_PORT: 8081
       ANDROID_AVD: webgpu-agent
       ANDROID_SYSTEM_IMAGE: system-images;android-35;default;x86_64
-      ANDROID_PACKAGE: com.microsoft.reacttestapp
+      ANDROID_PACKAGE: com.reactnativewebgpu.example
       AGENT_OUTPUT: ${{ github.workspace }}/agent-output
     steps:
       # The pull request's head when a number is given. The build then runs
@@ -389,7 +389,9 @@ jobs:
           ok=0; for i in 1 2 3 4 5; do adb wait-for-device install -r apps/example/android/app/build/outputs/apk/debug/app-debug.apk && ok=1 && break; echo "adb install failed (attempt $i)"; sleep 5; done; [ "$ok" = 1 ]
           curl -sf --max-time 900 -o /dev/null \
             "http://localhost:$METRO_PORT/index.bundle?platform=android&dev=true&lazy=true&minify=false"
-          adb shell am start -W -n "$ANDROID_PACKAGE/.MainActivity"
+          # The activity keeps react-native-test-app's own package name: the
+          # application id is the example's, the Java namespace is not.
+          adb shell am start -W -n "$ANDROID_PACKAGE/com.microsoft.reacttestapp.MainActivity"
           sleep 20
           adb exec-out screencap -p > "$AGENT_OUTPUT/launch.png"
 

.github/workflows/ci.yml

@@ -424,7 +424,7 @@ jobs:
             adb reverse tcp:8081 tcp:8081
             nohup adb logcat > logcat.txt 2>&1 &
             adb install -r apps/example/android/app/build/outputs/apk/debug/app-debug.apk
-            adb shell monkey -p com.microsoft.reacttestapp 1
+            adb shell monkey -p com.reactnativewebgpu.example 1
             cd packages/webgpu && yarn test
 
       # Same purpose as the iOS upload above: missing snapshots written on this

apps/example/app.json

@@ -34,6 +34,7 @@
     }
   },
   "android": {
+    "package": "com.reactnativewebgpu.example",
     "permissions": [
       { "android:name": "android.permission.INTERNET" },
       { "android:name": "android.permission.CAMERA" },

apps/example/react-native.config.js

@@ -4,6 +4,8 @@ const project = (() => {
     return configureProjects({
       android: {
         sourceDir: "android",
+        // The Java namespace of react-native-test-app's app module, where
+        // BuildConfig lives (the application id is set in app.json).
         packageName: "com.microsoft.reacttestapp"
       },
       ios: {