update README

README.md

@@ -2,9 +2,7 @@ Chinese grammar data manually copied and edited from <https://resources.allsetle
 
 ## How it works for Android
 
-Using Tauri, it runs on Android even with dev server down, with `tauri android run`. (while no hot-reloading)
-
-An extra CSS is needed for Android webview fix:-
+Using Tauri, an extra CSS is needed for Android webview fix:-
 
 ```css
 body {
@@ -14,3 +12,49 @@ body {
   padding-right: env(safe-area-inset-right);
 }
 ```
+
+### Android without hot-reload
+
+Tauri for Android target runs even with dev server down, with `tauri android run` (while no hot-reloading).
+
+APK will be generated at `src-tauri/gen/android/app/build/outputs/apk/arm64/debug/app-arm64-debug.apk` which can be installed with
+
+```sh
+adb install -r src-tauri/gen/android/app/build/outputs/apk/arm64/debug/app-arm64-debug.apk
+```
+
+### Android hot-reload
+
+When dev server is used, in addition to Android app won't work with dev server down, Firewall settings must also be allowed.
+
+For Windows PowerShell,
+
+```powershell
+New-NetFirewallRule -DisplayName "Vitepress Server" -Direction Inbound -Protocol TCP -LocalPort 5173 -Action Allow
+```
+
+In addition, dev server needs to bind to `0.0.0.0` or `TAURI_DEV_HOST` env var.
+
+```ts
+import { defineConfig, MarkdownOptions } from "vitepress";
+
+const host = process.env.TAURI_DEV_HOST;
+
+// https://vitepress.dev/reference/site-config
+export default defineConfig({
+  vite: {
+    server: {
+      port: 5173,
+      strictPort: true,
+      host: host || false,
+      hmr: host
+        ? {
+            protocol: "ws",
+            host,
+            port: 5174,
+          }
+        : undefined,
+    },
+  },
+});
+```