A third Android build, fcm (io.coinos.beta, "Coinos Beta"): the wallet in its own WebView, as the webview build, with Firebase Cloud Messaging for push on phones with Google Play Services — no distributor app to install. A user on the TWA APK found launching slow next to Minibits (2026-11-05); measured on a Pixel 9, a WebView paints ~0.7 s sooner than a cold Chrome. This build installs beside the TWA for a side-by-side trial before deciding whether it replaces it. Fcm asks for the token and stores "fcm:<token>" as the push endpoint, which reaches the page down the UnifiedPush road (?up= on the next launch, or written straight into the page's localStorage once it has loaded, since the token arrives after the first load starts); nwcpush (coinosv3-server 0c50417) sends an fcm: endpoint through Firebase. FcmService hands a message's "body" to the same handler UnifiedPush messages use (PushReceiver.onPush: wake the wallet off-screen, notify unless it answered a silent request). Firebase is set up in code (CoinosApp → Fcm.init) from values build.gradle reads out of app/google-services.json (gitignored) — without it the build still builds and falls back to UnifiedPush. The webview and fdroid builds get a stub Fcm (src/nofcm) and carry no Google code; the notification permission is asked when Firebase or a distributor can deliver; CoinosHost.env reports app "fcm"

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01VMan6Ts5Tktega8VbLg31q

1 files changed, 46 insertions, 1 deletions

diff --git a/android/app/build.gradle b/android/app/build.gradle
index 0119e93..046358d 100644
--- a/android/app/build.gradle
+++ b/android/app/build.gradle
@@ -22,6 +22,24 @@ tasks.register('copyWeb', Copy) {
   into layout.buildDirectory.dir('www')
 }
 
+// Firebase settings for the fcm build, read from app/google-services.json
+// (downloaded from the Firebase console; gitignored). Without it the fcm
+// build still builds, and pushes through UnifiedPush like the webview one.
+def firebase = [appId: '', apiKey: '', projectId: '', senderId: '']
+def gsFile = file('google-services.json')
+if (gsFile.exists()) {
+  def gs = new groovy.json.JsonSlurper().parse(gsFile)
+  def client = gs.client.find { it.client_info?.android_client_info?.package_name == 'io.coinos.beta' }
+  if (client) {
+    firebase = [
+      appId: client.client_info.mobilesdk_app_id,
+      apiKey: client.api_key[0].current_key,
+      projectId: gs.project_info.project_id,
+      senderId: gs.project_info.project_number,
+    ]
+  }
+}
+
 android {
   namespace 'io.coinos.app'
   compileSdk 35
@@ -66,6 +84,21 @@ android {
       resValue 'string', 'app_name', 'Coinos (UnifiedPush)'
       buildConfigField 'boolean', 'BUNDLED', 'false'
     }
+    // fcm — the webview shell plus Firebase Cloud Messaging: push without a
+    //          distributor app on phones with Google Play Services (see
+    //          src/fcm/java/io/coinos/app/Fcm.java). Its own app id, so it
+    //          installs beside the TWA for a side-by-side trial.
+    fcm {
+      dimension 'shell'
+      applicationId 'io.coinos.beta'
+      versionNameSuffix '-beta'
+      resValue 'string', 'app_name', 'Coinos Beta'
+      buildConfigField 'boolean', 'BUNDLED', 'false'
+      buildConfigField 'String', 'FCM_APP_ID', "\"${firebase.appId}\""
+      buildConfigField 'String', 'FCM_API_KEY', "\"${firebase.apiKey}\""
+      buildConfigField 'String', 'FCM_PROJECT_ID', "\"${firebase.projectId}\""
+      buildConfigField 'String', 'FCM_SENDER_ID', "\"${firebase.senderId}\""
+    }
     fdroid {
       dimension 'shell'
       applicationId 'io.coinos.fdroid'
@@ -74,9 +107,19 @@ android {
     }
   }
   sourceSets {
+    // the webview shell has no Firebase: its Fcm is a stub
+    webview {
+      java.srcDirs += 'src/nofcm/java'
+    }
+    // the webview shell with Firebase (the manifest is webview's plus FCM)
+    fcm {
+      java.srcDirs = ['src/webview/java', 'src/fcm/java']
+      res.srcDirs = ['src/webview/res']
+      manifest.srcFile 'src/fcm/AndroidManifest.xml'
+    }
     // the same shell as webview, plus the bundled web app
     fdroid {
-      java.srcDirs = ['src/webview/java']
+      java.srcDirs = ['src/webview/java', 'src/nofcm/java']
       res.srcDirs = ['src/webview/res']
       manifest.srcFile 'src/webview/AndroidManifest.xml'
       assets.srcDirs += layout.buildDirectory.dir('www').get().asFile
@@ -102,6 +145,8 @@ android {
 dependencies {
   // only the TWA shell needs Chrome's helper; the WebView build carries none
   twaImplementation 'com.google.androidbrowserhelper:androidbrowserhelper:2.5.0'
+  // only the fcm build carries Google's push client
+  fcmImplementation 'com.google.firebase:firebase-messaging:24.1.0'
 }
 
 preBuild.dependsOn copyWeb