[No-QA] feat: Report time to full display when NewDot's splash hides

android/app/src/main/java/com/expensify/chat/AppStateTrackerModule.kt

@@ -4,6 +4,7 @@ import com.facebook.react.bridge.Promise
 import com.facebook.react.bridge.ReactApplicationContext
 import com.facebook.react.bridge.ReactContextBaseJavaModule
 import com.facebook.react.bridge.ReactMethod
+import com.facebook.react.bridge.UiThreadUtil
 
 import com.expensify.chat.MainActivity
 
@@ -25,4 +26,14 @@ class AppStateTrackerModule(reactContext: ReactApplicationContext) : ReactContex
             promise.resolve(false)
         }
     }
+
+    /**
+     * Tells Android that NewDot finished its first screen, which records time to full display for this launch.
+     */
+    @ReactMethod
+    fun reportFullyDrawn() {
+        UiThreadUtil.runOnUiThread {
+            reactApplicationContext.getCurrentActivity()?.reportFullyDrawn()
+        }
+    }
 }

src/Expensify.tsx

@@ -38,6 +38,7 @@ import PushNotification from './libs/Notification/PushNotification';
 import {endSpan, getSpan, startSpan} from './libs/telemetry/activeSpans';
 import {startBootsplashMonitor} from './libs/telemetry/bootsplashTelemetry';
 import {scheduleInitialDatabaseSizeMeasurement} from './libs/telemetry/databaseSizeTracker';
+import reportFullyDrawn from './libs/telemetry/reportFullyDrawn';
 import {cleanupTelemetryTrackers, initializeTelemetryTrackers} from './libs/telemetry/TelemetrySynchronizer';
 import Visibility from './libs/Visibility';
 import ONYXKEYS from './ONYXKEYS';
@@ -209,6 +210,7 @@ function Expensify() {
         setSplashScreenState(CONST.BOOT_SPLASH_STATE.HIDDEN);
         endSpan(CONST.TELEMETRY.SPAN_OD_ND_TRANSITION);
         endSpan(CONST.TELEMETRY.SPAN_APP_STARTUP);
+        reportFullyDrawn();
         endSpan(CONST.TELEMETRY.SPAN_BOOTSPLASH.ROOT);
         endSpan(CONST.TELEMETRY.SPAN_BOOTSPLASH.SPLASH_HIDER);
         scheduleInitialDatabaseSizeMeasurement();

src/libs/telemetry/reportFullyDrawn/index.android.ts

@@ -0,0 +1,9 @@
+import {NativeModules} from 'react-native';
+
+import type ReportFullyDrawn from './types';
+
+const reportFullyDrawn: ReportFullyDrawn = () => {
+    NativeModules.AppStateTracker.reportFullyDrawn?.();
+};
+
+export default reportFullyDrawn;

src/libs/telemetry/reportFullyDrawn/index.ts

@@ -0,0 +1,6 @@
+import type ReportFullyDrawn from './types';
+
+// Time to full display is an Android startup metric, so the other platforms have nothing to report.
+const reportFullyDrawn: ReportFullyDrawn = () => {};
+
+export default reportFullyDrawn;

src/libs/telemetry/reportFullyDrawn/types.ts

@@ -0,0 +1,3 @@
+type ReportFullyDrawn = () => void;
+
+export default ReportFullyDrawn;

src/types/modules/react-native.d.ts

@@ -9,6 +9,8 @@ import type {TargetedEvent} from 'react-native';
 
 type AppStateTrackerModule = {
     getWasAppRelaunchedFromIcon: () => Promise<boolean>;
+    // Missing on binaries built before this method was added.
+    reportFullyDrawn?: () => void;
 };
 
 type RNTextInputResetModule = {