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, 27 insertions, 5 deletions

diff --git a/android/app/src/webview/java/io/coinos/app/MainActivity.java b/android/app/src/webview/java/io/coinos/app/MainActivity.java
index d88a969..b26d6c5 100644
--- a/android/app/src/webview/java/io/coinos/app/MainActivity.java
+++ b/android/app/src/webview/java/io/coinos/app/MainActivity.java
@@ -77,6 +77,11 @@ public class MainActivity extends Activity {
       }
 
       @Override
+      public void onPageFinished(WebView v, String url) {
+        endpointToPage();
+      }
+
+      @Override
       public boolean shouldOverrideUrlLoading(WebView v, WebResourceRequest r) {
         Uri u = r.getUrl();
         String host = u.getHost();
@@ -118,9 +123,11 @@ public class MainActivity extends Activity {
       }
     });
 
-    // Notifications only ever come from UnifiedPush, so the permission is
-    // asked for only when a distributor is installed to deliver them.
-    if (Build.VERSION.SDK_INT >= 33 && !Push.distributors(this).isEmpty()
+    // Notifications come from Firebase (the fcm build, with Play Services)
+    // or a UnifiedPush distributor, so the permission is asked for only when
+    // one of them is there to deliver them.
+    boolean fcm = Fcm.available(this);
+    if (Build.VERSION.SDK_INT >= 33 && (fcm || !Push.distributors(this).isEmpty())
         && checkSelfPermission(Manifest.permission.POST_NOTIFICATIONS) != PackageManager.PERMISSION_GRANTED) {
       try { requestPermissions(new String[] { Manifest.permission.POST_NOTIFICATIONS }, REQ_PERMS); } catch (Exception ignored) {}
     }
@@ -128,10 +135,25 @@ public class MainActivity extends Activity {
     // can deliver a push — the advice it gives is useless otherwise ("use
     // Firefox" makes no sense inside a WebView that IS the app).
     web.addJavascriptInterface(new Host(), "CoinosHost");
-    Push.register(this);
+    // Firebase when it can; otherwise a distributor. A Firebase token
+    // arrives after the page has started loading, so it goes straight into
+    // the page rather than waiting for the next launch's ?up=.
+    if (!Fcm.register(this, () -> runOnUiThread(this::endpointToPage))) Push.register(this);
     web.loadUrl(urlFor(getIntent()));
   }
 
+  /**
+   * The push endpoint, put where the page keeps it (messages.js and nwc.js
+   * read 'coinos-unifiedpush') — once the page is ours to write into.
+   */
+  private void endpointToPage() {
+    String endpoint = Push.endpoint(this);
+    String url = web == null ? null : web.getUrl();
+    if (endpoint == null || Push.endpointDelivered(this) || url == null || !url.startsWith(BASE)) return;
+    web.evaluateJavascript("try{localStorage.setItem('coinos-unifiedpush'," + org.json.JSONObject.quote(endpoint) + ")}catch(e){}", null);
+    Push.markEndpointDelivered(this);
+  }
+
   /** What the page is allowed to ask about its surroundings. */
   private class Host {
     @android.webkit.JavascriptInterface
@@ -139,7 +161,7 @@ public class MainActivity extends Activity {
       String dist = Push.distributor(MainActivity.this);
       List<String> all = Push.distributors(MainActivity.this);
       String endpoint = Push.endpoint(MainActivity.this);
-      return "{\"app\":\"graphene\",\"distributors\":" + all.size()
+      return "{\"app\":\"" + (Fcm.available(MainActivity.this) ? "fcm" : "graphene") + "\",\"distributors\":" + all.size()
           + ",\"distributor\":" + (dist == null ? "null" : "\"" + dist + "\"")
           + ",\"endpoint\":" + (endpoint != null) + "}";
     }