Update android startup doc per feedback and added note on --use-fully-drawn-time

Author: LoopedBard3

docs/android-startup-scenarios.md

@@ -3,7 +3,8 @@
 
 ## Prereqs
 
-- Ensure `dotnet` is installed and available with the `dotnet` command for easy xharness installation. Any supported .NET Core version should work. [Dotnet Download](https://dotnet.microsoft.com/en-us/download) or [Daily Dotnet Download](https://github.com/dotnet/sdk/blob/main/documentation/package-table.md)
+- Ensure `python` is installed and available. Any currently supported `python` 3.* version should work. Downloads are available at https://www.python.org/downloads/.
+- Ensure `dotnet` is installed and available with the `dotnet` command for easy xharness installation. Any supported .NET Core version should work. [Dotnet Download](https://dotnet.microsoft.com/en-us/download) or [Daily Dotnet Download](https://github.com/dotnet/sdk/blob/main/documentation/package-table.md).
 - Ensure `xharness` is installed and available with the `xharness` command. The current version in use can be found in the `eng/performance/maui_scenarios_android.proj` file at line 7 (under the tag `MicrosoftDotNetXHarnessCLIVersion`), although any recent version should work. [XHarness Install Instructions](https://github.com/dotnet/xharness?tab=readme-ov-file#installation-and-usage).
 - Have an Android app APK available for testing.
 - Have an Android Device (with developer mode enabled) or emulator connected to computer, and viewable with `xharness android device` or `xharness android adb -- devices -l`.
@@ -14,7 +15,7 @@
 
     ```sh
     cd src/scenarios
-    . ./init.sh  # or `.\init.ps1` on Windows
+    . ./init.sh  # or `.\init.ps1` on Windows. Can specify custom dotnet install with -dotnetdir <dir>, but dotnet install should not impact Android Startup testing itself.
     ```
 
 2. Navigate to the `helloandroid` scenario directory:
@@ -27,9 +28,35 @@
 4. Run the test:
 
     ```sh
-    python test.py devicestartup --device-type android --package-path <path to apk (e.g. .)>/<apkname>.apk --package-name <apk package name> [--disable-animations]
+    python/(py -3 on Linux) test.py devicestartup --device-type android --package-path <path to apk (e.g. .)>/<apkname>.apk --package-name <apk package name> [--disable-animations] [--use-fully-drawn-time --fully-drawn-extra-delay <delay in sec> (**see below for note**)]
     ```
 
+5. Read the output:
+
+    During the running of the test you will see the loop of the activity being started to get the startup times.
+    Once the testing is completed, you will see output similar to the following:
+
+    ```txt
+    [2025/01/29 11:15:44][INFO] Found Value (ms): 713
+    [2025/01/29 11:15:44][INFO] Found Value (ms): 715
+    [2025/01/29 11:15:44][INFO] Found Value (ms): 728
+    [2025/01/29 11:15:44][INFO] Found Value (ms): 716
+    [2025/01/29 11:15:44][INFO] Found Value (ms): 715
+    [2025/01/29 11:15:44][INFO] Found Value (ms): 734
+    [2025/01/29 11:15:44][INFO] Found Value (ms): 716
+    [2025/01/29 11:15:44][INFO] Found Value (ms): 718
+    [2025/01/29 11:15:44][INFO] Found Value (ms): 713
+    [2025/01/29 11:15:44][INFO] Found Value (ms): 706
+    [2025/01/29 11:15:44][INFO] Device Startup - Maui Android Default NoAnimation
+    [2025/01/29 11:15:44][INFO] Metric          |Average        |Min            |Max
+    [2025/01/29 11:15:44][INFO] ----------------|---------------|---------------|---------------
+    [2025/01/29 11:15:44][INFO] Generic Startup |717.400 ms     |706.000 ms     |734.000 ms
+    ```
+
+    The Found Value's are the individual test run startup times with the overall stats at the bottom. The stats provided include the following startup stats: average, minimum, and maximum times.
+
 ## Notes
 
-- Example commands and additional logic can be found in the `maui_scenarios_android.proj` and `runner.py` files in the `performance` repository.
+- Specific example command such as when using the runtime android example app: `python test.py devicestartup --device-type android --package-path HelloAndroid.apk --package-name net.dot.HelloAndroid`.
+- Other example commands and additional logic can be found in the `maui_scenarios_android.proj` and `runner.py` files in the `performance` repository.
+- If using `[--use-fully-drawn-time --fully-drawn-extra-delay <delay in sec>]` arguments, the Android app must have reportFullyDrawn() called on a ComponentActivity. Reference: https://developer.android.com/topic/performance/vitals/launch-time#retrieve-TTFD.