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AdMob Configuration Fix

Issue Detected ✅ FIXED

When starting the Metro bundler, you saw this error:

No 'androidAppId' was provided. The native Google Mobile Ads SDK will crash on Android without it.

Root Cause

The AdMob plugin configuration in app.config.js was using the wrong key name:

  • ❌ Wrong: android_app_id (snake_case)
  • ✅ Correct: androidAppId (camelCase)

Fix Applied

Updated app.config.js

Before (Incorrect):

plugins: [
  [
    "react-native-google-mobile-ads",
    {
      android_app_id: "ca-app-pub-3940256099942544~3347511713", // ❌ Wrong key
    }
  ]
]

After (Correct):

plugins: [
  [
    "react-native-google-mobile-ads",
    {
      androidAppId: "ca-app-pub-3940256099942544~3347511713", // ✅ Correct key
    }
  ]
]

Verification

The configuration is now correct and the error should no longer appear when you:

  1. Restart Metro bundler
  2. Build the app
  3. Run the app

Next Steps

1. Restart Metro (if still running)

# Press Ctrl+C to stop current Metro
# Then restart:
npm start

2. Build the App

# For testing (recommended)
eas build --profile development --platform android

# OR for preview
eas build --profile preview --platform android

3. Verify Fix

When you build/run the app, you should see:

  • ✅ No "androidAppId was not provided" error
  • ✅ Metro bundler starts without warnings
  • ✅ AdMob initializes successfully on device

What This Fixes

Before Fix:

  • ⚠️ Warning on Metro start
  • ⚠️ App would crash when trying to load ads
  • ⚠️ AdMob SDK wouldn't initialize properly

After Fix:

  • ✅ No warnings on Metro start
  • ✅ AdMob SDK initializes correctly
  • ✅ Ads will load and display properly
  • ✅ Ready for testing

Documentation Updated

The following documentation files have been updated with the correct key name:

  • ✅ ADMOB_IMPLEMENTATION.md - Production deployment section
  • ✅ app.config.js - Live configuration file

Testing Checklist

After this fix, test the following:

Build Test

# Stop any running Metro
# Build app
eas build --profile development --platform android

Expected result:

  • ✅ Build completes without AdMob warnings
  • ✅ No "androidAppId" errors in build logs

Runtime Test

Install the built APK and verify:

  • ✅ App launches without crash
  • ✅ Banner ads load on all screens (Home, Market, Stats, About)
  • ✅ Interstitial ads show when switching tabs
  • ✅ Console shows "AdMob initialized" message

Console Logs to Look For

✅ "AdMob initialized: [adapter statuses]"
✅ "Banner ad loaded successfully"
✅ "Interstitial ad loaded successfully"

Common Related Issues

If you still see the error:

  1. Clear Metro cache:

    npx expo start --clear

  2. Reinstall dependencies:

    rm -rf node_modules
npm install

  3. Rebuild the app:

    eas build --profile development --platform android --clear-cache

If iOS also needs AdMob:

Add iosAppId to the same configuration:

plugins: [
  [
    "react-native-google-mobile-ads",
    {
      androidAppId: "ca-app-pub-3940256099942544~3347511713", // Android Test ID
      iosAppId: "ca-app-pub-3940256099942544~1458002511",     // iOS Test ID
    }
  ]
]

Note: For now, we're only implementing Android ads, so iosAppId is not required.

Summary

✅ Issue: Wrong configuration key name prevented AdMob from initializing ✅ Fix: Changed android_app_id to androidAppId ✅ Status: Configuration corrected and ready for testing ✅ Next: Rebuild app and test ads on device

Fix Applied: 2025-10-18 Status: ✅ RESOLVED Ready for: Building and testing