feat: webapp multi-tab JS bridge and multi-WebView management

app/src/main/assets/h5/js/webapp/topbar.js

@@ -34,6 +34,11 @@ window.showTopbar = function (tabs) {
   document.getElementById('tb-tabs').textContent = `标签 (${tabs.length})`;
   const active = tabs.find(t => t.active);
   document.getElementById('tb-title').textContent = active ? active.name : '';
+  // 无标签时隐藏顶栏与标签面板（回到桌面）
+  // Hide the topbar and tab panel when no tabs remain (back to desktop)
+  bar.style.display = tabs.length ? 'flex' : 'none';
+  const panel = document.getElementById('tab-panel');
+  if (panel && !tabs.length) panel.style.display = 'none';
 };
 
 // 标签面板：列出所有标签，点击切换，× 关闭

app/src/main/java/top/yeij/hearth/MainActivity.kt

@@ -5,26 +5,32 @@ import android.content.res.Configuration
 import android.os.Bundle
 import android.text.TextUtils
 import android.util.Log
+import android.view.View
+import android.view.ViewGroup
 import android.view.WindowInsets
 import android.view.WindowInsetsController
 import android.webkit.WebView
 import android.webkit.WebViewClient
+import android.widget.FrameLayout
 import androidx.core.app.NotificationManagerCompat
+import com.google.gson.Gson
 import top.yeij.hearth.app.AndroidAppSource
 import top.yeij.hearth.app.AppRepository
 import top.yeij.hearth.cache.CacheManager
 import top.yeij.hearth.card.CardRepository
 import top.yeij.hearth.media.MediaSessionSource
 import top.yeij.hearth.webapp.OkHttpHttpClient
+import top.yeij.hearth.webapp.Tab
 import top.yeij.hearth.webapp.WebAppContainer
 import top.yeij.hearth.webapp.WebAppRepository
 import top.yeij.hearth.webview.JsBridge
+import top.yeij.hearth.webview.WebAppHost
 import top.yeij.hearth.webview.WebViewManager
 import java.io.File
 
-// HOME 桌面 activity，接线各能力层：Repository、媒体监听、WebView 错误页与 Back 键
+// HOME 桌面 activity，接线各能力层：Repository、媒体监听、多 WebView webAPP 管理
 // HOME launcher activity, wiring all capability layers: repositories, media listener,
-// WebView error page, and Back key handling
+// and multi-WebView webapp management
 class MainActivity : Activity() {
 
     companion object {
@@ -33,10 +39,18 @@ class MainActivity : Activity() {
         // Placeholder manifest/catalog URLs; replace with the real server on device
         private const val MANIFEST_URL = "https://example.com/hearth/manifest.json"
         private const val CATALOG_URL = "https://example.com/hearth/catalog.json"
+        // 内容 WebView 顶栏预留高度（dp）
+        // Topbar reserved height for content WebViews (dp)
+        private const val TOPBAR_HEIGHT_DP = 44
     }
 
     private val webAppContainer = WebAppContainer()
+    private val gson = Gson()
+    private val webAppHost = WebAppHostImpl()
     private lateinit var mediaSource: MediaSessionSource
+    private lateinit var root: FrameLayout
+    private lateinit var desktopWebView: WebView
+    private lateinit var bridge: JsBridge
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -48,12 +62,13 @@ class MainActivity : Activity() {
 
     override fun onDestroy() {
         mediaSource.stop()
+        webAppHost.destroyAll()
         super.onDestroy()
     }
 
-    // 创建 JsBridge 并挂载 WebView 桌面层，接线所有 Repository 与媒体监听
+    // 创建 JsBridge 并挂载桌面 WebView（底层），接线所有 Repository 与媒体监听
-    // Create JsBridge and mount the WebView launcher layer, wiring all repositories
+    // Create JsBridge and mount the desktop WebView (bottom layer), wiring all
-    // and the media session listener
+    // repositories and the media session listener
     private fun setupWebView() {
         val dm = resources.displayMetrics
         val darkMode =
@@ -61,7 +76,7 @@ class MainActivity : Activity() {
                 Configuration.UI_MODE_NIGHT_YES
         val cache = CacheManager(File(filesDir, "cache"))
         val http = OkHttpHttpClient()
-        val bridge = JsBridge(
+        bridge = JsBridge(
             deviceWidthPx = dm.widthPixels,
             deviceHeightPx = dm.heightPixels,
             density = dm.density,
@@ -69,9 +84,13 @@ class MainActivity : Activity() {
             appRepository = AppRepository(AndroidAppSource(this)),
             webAppRepository = WebAppRepository(http, cache, MANIFEST_URL),
             cardRepository = CardRepository(http, cache, CATALOG_URL),
+            webAppContainer = webAppContainer,
+            webAppHost = webAppHost,
         )
-        val webView = WebViewManager(this).attach(bridge)
+        root = FrameLayout(this)
-        webView.webViewClient = object : WebViewClient() {
+        setContentView(root)
+        desktopWebView = WebViewManager(this).attach(bridge, root)
+        desktopWebView.webViewClient = object : WebViewClient() {
             // 主帧加载失败时展示错误页，避免白屏
             // Show an error page on main-frame load failure to avoid a blank screen
             @Suppress("DEPRECATION", "OVERRIDE_DEPRECATION")
@@ -86,7 +105,7 @@ class MainActivity : Activity() {
             }
         }
         mediaSource = MediaSessionSource(this)
-        bridge.setMediaListener(mediaSource, webView)
+        bridge.setMediaListener(mediaSource, desktopWebView)
         Log.d(
             TAG,
             "setupWebView: attached WebView ${dm.widthPixels}x${dm.heightPixels}" +
@@ -94,6 +113,109 @@ class MainActivity : Activity() {
         )
     }
 
+    // webAPP 内容 WebView 宿主实现：管理 id → WebView 映射、可见性、导航、顶栏同步
+    // Webapp content WebView host implementation: manage id -> WebView mapping,
+    // visibility, navigation, and topbar sync
+    private inner class WebAppHostImpl : WebAppHost {
+        private val contentWebViews = mutableMapOf<String, WebView>()
+        private var currentVisibleId: String? = null
+        private val topBarHeightPx by lazy {
+            (TOPBAR_HEIGHT_DP * resources.displayMetrics.density).toInt()
+        }
+
+        override fun openWebView(id: String, url: String) {
+            if (contentWebViews.containsKey(id)) {
+                switchWebView(id)
+                return
+            }
+            val webView = WebViewManager(this@MainActivity).createContentWebView()
+            webView.webViewClient = object : WebViewClient() {
+                @Suppress("DEPRECATION", "OVERRIDE_DEPRECATION")
+                override fun onReceivedError(
+                    view: WebView?,
+                    code: Int,
+                    description: String?,
+                    failingUrl: String?,
+                ) {
+                    Log.d(TAG, "content onReceivedError: code=$code desc=$description url=$failingUrl")
+                    view?.loadDataWithBaseURL(null, errorPage(description ?: "未知错误"), "text/html", "utf-8", null)
+                }
+            }
+            val params = FrameLayout.LayoutParams(
+                ViewGroup.LayoutParams.MATCH_PARENT,
+                ViewGroup.LayoutParams.MATCH_PARENT
+            )
+            params.topMargin = topBarHeightPx
+            contentWebViews[id] = webView
+            root.addView(webView, params)
+            webView.loadUrl(url)
+            switchWebView(id)
+            Log.d(TAG, "openWebView: id=$id url=$url topMargin=$topBarHeightPx")
+        }
+
+        override fun closeWebView(id: String) {
+            val webView = contentWebViews.remove(id) ?: return
+            root.removeView(webView)
+            webView.stopLoading()
+            webView.destroy()
+            if (currentVisibleId == id) currentVisibleId = null
+            Log.d(TAG, "closeWebView: id=$id remaining=${contentWebViews.size}")
+        }
+
+        override fun switchWebView(id: String) {
+            currentVisibleId = id
+            contentWebViews.forEach { (tabId, webView) ->
+                webView.visibility = if (tabId == id) View.VISIBLE else View.GONE
+            }
+            Log.d(TAG, "switchWebView: id=$id")
+        }
+
+        override fun goBack(): Boolean {
+            val webView = currentVisibleId?.let { contentWebViews[it] }
+            return if (webView != null && webView.canGoBack()) {
+                webView.goBack()
+                true
+            } else {
+                false
+            }
+        }
+
+        override fun goForward(): Boolean {
+            val webView = currentVisibleId?.let { contentWebViews[it] }
+            return if (webView != null && webView.canGoForward()) {
+                webView.goForward()
+                true
+            } else {
+                false
+            }
+        }
+
+        override fun reload() {
+            currentVisibleId?.let { contentWebViews[it] }?.reload()
+        }
+
+        override fun syncTabs(tabs: List<Tab>) {
+            val json = gson.toJson(
+                tabs.map { mapOf("id" to it.id, "name" to it.name, "active" to it.active) }
+            )
+            desktopWebView.post {
+                desktopWebView.evaluateJavascript(
+                    "window.showTopbar && window.showTopbar($json);",
+                    null
+                )
+            }
+            Log.d(TAG, "syncTabs: ${tabs.size} tabs")
+        }
+
+        // 销毁全部内容 WebView（Activity 退出时释放资源）
+        // Destroy all content WebViews (release resources on activity teardown)
+        fun destroyAll() {
+            contentWebViews.values.forEach { it.stopLoading(); it.destroy() }
+            contentWebViews.clear()
+            currentVisibleId = null
+        }
+    }
+
     // 检测通知使用权是否已授予，未授予时打日志提示（UI 引导入口留后续）
     // Check whether notification access is granted; log a hint when not
     // (the settings UI entry is deferred to a later task)
@@ -139,15 +261,10 @@ class MainActivity : Activity() {
     // no history; consume the event on desktop state
     @Suppress("DEPRECATION")
     override fun onBackPressed() {
-        val tabs = webAppContainer.tabs()
+        val active = webAppContainer.tabs().firstOrNull { it.active }
-        if (tabs.isNotEmpty()) {
-            val active = tabs.firstOrNull { it.active }
         if (active != null) {
-                // goBack() 当前为占位 false，实际回退逻辑留 WebView 导航接入
+            if (!webAppHost.goBack()) {
-                // goBack() is a placeholder returning false; real navigation lands later
+                bridge.closeWebApp(active.id)
-                if (!webAppContainer.goBack()) {
-                    webAppContainer.close(active.id)
-                }
             }
             Log.d(TAG, "onBackPressed: webAPP back/close, remaining tabs=${webAppContainer.tabs().size}")
             return

app/src/main/java/top/yeij/hearth/webapp/WebAppContainer.kt

@@ -1,8 +1,9 @@
 package top.yeij.hearth.webapp
 
-// 单个 WebView 标签：id 唯一标识，active 表示是否为当前激活标签
+// 单个 WebView 标签：id 唯一标识，active 表示是否为当前激活标签，name 为展示名
-// Single WebView tab: id is the unique key, active marks the currently-focused tab
+// Single WebView tab: id is the unique key, active marks the currently-focused tab,
-data class Tab(val id: String, val url: String, val active: Boolean = false)
+// name is the display title (from the web app manifest)
+data class Tab(val id: String, val url: String, val active: Boolean = false, val name: String = "")
 
 // 多标签状态管理（纯 Kotlin 数据层，不依赖 WebView，可 JVM 单测）
 // 真实 WebView 导航（goBack/goForward/reload）留待 Task 13 集成时接入
@@ -11,16 +12,17 @@ data class Tab(val id: String, val url: String, val active: Boolean = false)
 class WebAppContainer {
     private val tabs = mutableListOf<Tab>()
 
-    // 打开标签：已存在则激活它（不重复添加），否则新增并激活
+    // 打开标签：已存在则激活它（不重复添加），否则新增并激活；name 记录展示名
-    // Open a tab: if it already exists just activate it, otherwise add and activate
+    // Open a tab: if it already exists just activate it, otherwise add and activate;
-    fun open(id: String, url: String) {
+    // name records the display title from the manifest
+    fun open(id: String, url: String, name: String = "") {
         val existing = tabs.find { it.id == id }
         if (existing != null) {
             setActive(id)
             return
         }
         for (i in tabs.indices) tabs[i] = tabs[i].copy(active = false)
-        tabs.add(Tab(id, url, active = true))
+        tabs.add(Tab(id, url, active = true, name = name))
     }
 
     // 关闭标签：若关闭后没有激活标签则激活第一个
@@ -42,6 +44,10 @@ class WebAppContainer {
     // Return a defensive copy of the tab list
     fun tabs(): List<Tab> = tabs.toList()
 
+    // 返回当前激活标签 id，无标签或未激活返回 null
+    // Return the active tab id, or null when empty/none active
+    fun activeTabId(): String? = tabs.firstOrNull { it.active }?.id
+
     private fun setActive(id: String) {
         for (i in tabs.indices) tabs[i] = tabs[i].copy(active = tabs[i].id == id)
     }

app/src/main/java/top/yeij/hearth/webview/JsBridge.kt

@@ -5,7 +5,9 @@ import top.yeij.hearth.app.AppRepository
 import top.yeij.hearth.card.Card
 import top.yeij.hearth.card.CardRepository
 import top.yeij.hearth.media.MediaSessionSource
+import top.yeij.hearth.webapp.Tab
 import top.yeij.hearth.webapp.WebApp
+import top.yeij.hearth.webapp.WebAppContainer
 import top.yeij.hearth.webapp.WebAppRepository
 
 class JsBridge(
@@ -16,6 +18,8 @@ class JsBridge(
     private val appRepository: AppRepository? = null,
     private val webAppRepository: WebAppRepository? = null,
     private val cardRepository: CardRepository? = null,
+    private val webAppContainer: WebAppContainer? = null,
+    private val webAppHost: WebAppHost? = null,
 ) {
     private val gson = com.google.gson.Gson()
 
@@ -47,6 +51,94 @@ class JsBridge(
     @android.webkit.JavascriptInterface
     fun fetchWebApps(): String = gson.toJson(webAppRepository?.fetchManifest() ?: emptyList<WebApp>())
 
+    // 打开指定 id 的 webAPP：从清单找 url/name → 创建内容 WebView → 记录标签 → 同步顶栏
+    // Open a web app by id: look up url/name from the manifest -> create content WebView
+    // -> record the tab -> sync the topbar
+    @android.webkit.JavascriptInterface
+    fun openWebApp(id: String) {
+        val repo = webAppRepository ?: return
+        val container = webAppContainer ?: return
+        val host = webAppHost ?: return
+        val app = repo.fetchManifest().firstOrNull { it.id == id }
+        if (app == null) {
+            Log.d("HearthBridge", "openWebApp: unknown id=$id")
+            return
+        }
+        host.openWebView(id, app.url)
+        container.open(id, app.url, app.name)
+        syncTabs()
+        Log.d("HearthBridge", "openWebApp: id=$id name=${app.name} url=${app.url}")
+    }
+
+    // 关闭指定 id 的标签：销毁 WebView → 移除标签 → 若剩标签激活第一个 → 同步顶栏
+    // Close a tab by id: destroy WebView -> remove tab -> activate first if any remain
+    // -> sync the topbar
+    @android.webkit.JavascriptInterface
+    fun closeWebApp(id: String) {
+        val container = webAppContainer ?: return
+        val host = webAppHost ?: return
+        host.closeWebView(id)
+        container.close(id)
+        container.activeTabId()?.let { host.switchWebView(it) }
+        syncTabs()
+        Log.d("HearthBridge", "closeWebApp: id=$id remaining=${container.tabs().size}")
+    }
+
+    // 切换激活标签并显示对应 WebView
+    // Switch the active tab and show its WebView
+    @android.webkit.JavascriptInterface
+    fun switchTab(id: String) {
+        val container = webAppContainer ?: return
+        val host = webAppHost ?: return
+        container.switchTo(id)
+        host.switchWebView(id)
+        syncTabs()
+        Log.d("HearthBridge", "switchTab: id=$id")
+    }
+
+    // 返回已打开标签列表 JSON（id/name/active）
+    // Return the open tab list JSON (id/name/active)
+    @android.webkit.JavascriptInterface
+    fun listTabs(): String {
+        val container = webAppContainer ?: return "[]"
+        val tabs = container.tabs().map { tab ->
+            mapOf("id" to tab.id, "name" to tab.name, "active" to tab.active)
+        }
+        return gson.toJson(tabs)
+    }
+
+    // 当前激活标签回退
+    // Go back on the active tab
+    @android.webkit.JavascriptInterface
+    fun webGoBack() {
+        webAppHost?.goBack()
+        Log.d("HearthBridge", "webGoBack called")
+    }
+
+    // 当前激活标签前进
+    // Go forward on the active tab
+    @android.webkit.JavascriptInterface
+    fun webGoForward() {
+        webAppHost?.goForward()
+        Log.d("HearthBridge", "webGoForward called")
+    }
+
+    // 当前激活标签重载
+    // Reload the active tab
+    @android.webkit.JavascriptInterface
+    fun webReload() {
+        webAppHost?.reload()
+        Log.d("HearthBridge", "webReload called")
+    }
+
+    // 将容器标签状态推送给宿主（同步桌面 H5 顶栏）
+    // Push the container tab state to the host (sync the desktop H5 topbar)
+    private fun syncTabs() {
+        val container = webAppContainer ?: return
+        val host = webAppHost ?: return
+        host.syncTabs(container.tabs())
+    }
+
     // 返回首页卡片目录 JSON（无仓库时返回空数组；有仓库时由 fetchCatalog 保证内置 time 卡）
     // Return the home card catalog JSON (empty array when no repository wired;
     // fetchCatalog guarantees the builtin time card when wired)

app/src/main/java/top/yeij/hearth/webview/WebAppHost.kt

@@ -0,0 +1,38 @@
+package top.yeij.hearth.webview
+
+import top.yeij.hearth.webapp.Tab
+
+// webAPP 内容 WebView 宿主接口：由 MainActivity 实现，管理多 WebView 的生命周期、
+// 可见性、导航，并把标签状态同步回桌面 H5 顶栏
+// Web app content WebView host interface: implemented by MainActivity, managing
+// multi-WebView lifecycle, visibility, and navigation, and syncing tab state
+// back to the desktop H5 topbar
+interface WebAppHost {
+    // 创建内容 WebView 加载 url 并显示（已存在则切换到该标签）
+    // Create a content WebView loading url and show it (switch if already open)
+    fun openWebView(id: String, url: String)
+
+    // 销毁对应内容 WebView
+    // Destroy the corresponding content WebView
+    fun closeWebView(id: String)
+
+    // 切换可见内容 WebView（其它内容 WebView GONE）
+    // Switch the visible content WebView (hide the others with GONE)
+    fun switchWebView(id: String)
+
+    // 当前可见 WebView 回退，无历史返回 false
+    // Go back on the visible WebView, false when no history
+    fun goBack(): Boolean
+
+    // 当前可见 WebView 前进，无历史返回 false
+    // Go forward on the visible WebView, false when no history
+    fun goForward(): Boolean
+
+    // 当前可见 WebView 重载
+    // Reload the visible WebView
+    fun reload()
+
+    // 将标签状态推送到桌面 H5 顶栏
+    // Push the tab state to the desktop H5 topbar
+    fun syncTabs(tabs: List<Tab>)
+}

app/src/main/java/top/yeij/hearth/webview/WebViewManager.kt

@@ -2,17 +2,44 @@ package top.yeij.hearth.webview
 
 import android.annotation.SuppressLint
 import android.app.Activity
+import android.graphics.Color
+import android.view.ViewGroup
 import android.webkit.WebView
-import android.webkit.WebSettings
 import android.webkit.WebViewClient
 
+// WebView 工厂：统一内核配置，桌面层挂到指定父容器，内容层按需创建
+// WebView factory: unified kernel config; the desktop layer attaches to a given
+// parent container, content layers are created on demand
 class WebViewManager(private val activity: Activity) {
+    // 创建桌面 WebView（底层 H5）挂到 parent，加载内置 index.html
+    // Create the desktop WebView (bottom H5 layer) under parent, load bundled index.html
     @SuppressLint("SetJavaScriptEnabled")
-    fun attach(bridge: JsBridge): WebView {
+    fun attach(bridge: JsBridge, parent: ViewGroup): WebView {
         val webView = WebView(activity)
-        // 透明背景，露出原生壁纸
+        webView.setBackgroundColor(Color.TRANSPARENT)
-        // Transparent background to reveal native wallpaper
+        configure(webView)
-        webView.setBackgroundColor(android.graphics.Color.TRANSPARENT)
+        webView.addJavascriptInterface(bridge, "HearthBridge")
+        webView.webViewClient = WebViewClient()
+        webView.loadUrl("file:///android_asset/h5/index.html")
+        parent.addView(webView, ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT))
+        return webView
+    }
+
+    // 创建内容 WebView（webAPP 标签页），仅配置不加载、不挂载（由宿主管理）
+    // Create a content WebView (webapp tab), configured but not loaded/attached
+    // (lifecycle is managed by the host)
+    @SuppressLint("SetJavaScriptEnabled")
+    fun createContentWebView(): WebView {
+        val webView = WebView(activity)
+        webView.setBackgroundColor(Color.WHITE)
+        configure(webView)
+        return webView
+    }
+
+    // 统一内核配置：JS、宽视口、DOM 存储，禁用缩放
+    // Common kernel config: JS, wide viewport, DOM storage, zoom disabled
+    @SuppressLint("SetJavaScriptEnabled")
+    private fun configure(webView: WebView) {
         webView.settings.apply {
             javaScriptEnabled = true
             useWideViewPort = true
@@ -20,10 +47,5 @@ class WebViewManager(private val activity: Activity) {
             setSupportZoom(false)
             domStorageEnabled = true
         }
-        webView.addJavascriptInterface(bridge, "HearthBridge")
-        webView.webViewClient = WebViewClient()
-        webView.loadUrl("file:///android_asset/h5/index.html")
-        activity.setContentView(webView)
-        return webView
     }
 }

app/src/test/java/top/yeij/hearth/webapp/WebAppContainerTest.kt

@@ -58,4 +58,20 @@ class WebAppContainerTest {
         c.close("b")
         assertEquals("a", c.tabs().first { it.active }.id)
     }
+
+    @Test
+    fun open_withName_recordsDisplayName() {
+        val c = WebAppContainer()
+        c.open("a", "http://x/a", "云音乐")
+        assertEquals("云音乐", c.tabs()[0].name)
+    }
+
+    @Test
+    fun activeTabId_returnsActiveId_orNullWhenEmpty() {
+        val c = WebAppContainer()
+        assertEquals(null, c.activeTabId())
+        c.open("a", "http://x/a")
+        c.open("b", "http://x/b")
+        assertEquals("b", c.activeTabId())
+    }
 }

app/src/test/java/top/yeij/hearth/webview/JsBridgeTest.kt

@@ -1,12 +1,35 @@
 package top.yeij.hearth.webview
 
+import org.junit.Assert.assertEquals
 import org.junit.Assert.assertTrue
 import org.junit.Test
 import top.yeij.hearth.card.CardRepository
 import top.yeij.hearth.cache.CacheManager
 import top.yeij.hearth.webapp.HttpClient
+import top.yeij.hearth.webapp.Tab
+import top.yeij.hearth.webapp.WebAppContainer
+import top.yeij.hearth.webapp.WebAppRepository
 import java.io.File
 
+// 记录宿主方法调用，用于验证 JsBridge → WebAppHost 的接线
+// Record host method calls to verify JsBridge -> WebAppHost wiring
+private class FakeHost : WebAppHost {
+    var openedId: String? = null
+    var openedUrl: String? = null
+    val closedIds = mutableListOf<String>()
+    var switchedId: String? = null
+    var syncedTabs: List<Tab>? = null
+    var backCalls = 0
+
+    override fun openWebView(id: String, url: String) { openedId = id; openedUrl = url }
+    override fun closeWebView(id: String) { closedIds.add(id) }
+    override fun switchWebView(id: String) { switchedId = id }
+    override fun goBack(): Boolean { backCalls++; return false }
+    override fun goForward(): Boolean = false
+    override fun reload() {}
+    override fun syncTabs(tabs: List<Tab>) { syncedTabs = tabs }
+}
+
 class JsBridgeTest {
     @Test
     fun getDeviceInfo_returnsJsonWithDarkMode() {
@@ -38,4 +61,69 @@ class JsBridgeTest {
         assertTrue(json.contains("\"id\":\"time\""))
         dir.deleteRecursively()
     }
+
+    @Test
+    fun listTabs_withContainer_returnsJsonWithNameAndActive() {
+        val container = WebAppContainer()
+        container.open("a", "http://x/a", "云音乐")
+        val bridge = JsBridge(deviceWidthPx = 800, deviceHeightPx = 480, density = 2.0f, darkMode = true, webAppContainer = container)
+        val json = bridge.listTabs()
+        assertTrue(json.contains("\"id\":\"a\""))
+        assertTrue(json.contains("\"name\":\"云音乐\""))
+        assertTrue(json.contains("\"active\":true"))
+    }
+
+    @Test
+    fun listTabs_withoutContainer_returnsEmptyArray() {
+        val bridge = JsBridge(deviceWidthPx = 800, deviceHeightPx = 480, density = 2.0f, darkMode = true)
+        assertTrue(bridge.listTabs() == "[]")
+    }
+
+    @Test
+    fun openWebApp_findsUrlAndName_opensTabAndSyncs() {
+        val dir = File(System.getProperty("java.io.tmpdir"), "jb-open")
+        val http = object : HttpClient {
+            override fun get(url: String) = """{"apps":[{"id":"a","name":"云音乐","icon":"i","url":"http://x/a"}]}"""
+        }
+        val repo = WebAppRepository(http, CacheManager(dir), "http://fake")
+        val container = WebAppContainer()
+        val host = FakeHost()
+        val bridge = JsBridge(
+            deviceWidthPx = 800, deviceHeightPx = 480, density = 2.0f, darkMode = true,
+            webAppRepository = repo, webAppContainer = container, webAppHost = host,
+        )
+        bridge.openWebApp("a")
+        assertEquals("a", host.openedId)
+        assertEquals("http://x/a", host.openedUrl)
+        assertEquals(1, container.tabs().size)
+        assertEquals("云音乐", container.tabs()[0].name)
+        assertEquals(1, host.syncedTabs?.size)
+        dir.deleteRecursively()
+    }
+
+    @Test
+    fun closeWebApp_destroysWebView_removesTab_andSyncs() {
+        val container = WebAppContainer()
+        container.open("a", "http://x/a", "云音乐")
+        val host = FakeHost()
+        val bridge = JsBridge(
+            deviceWidthPx = 800, deviceHeightPx = 480, density = 2.0f, darkMode = true,
+            webAppContainer = container, webAppHost = host,
+        )
+        bridge.closeWebApp("a")
+        assertTrue(host.closedIds.contains("a"))
+        assertTrue(container.tabs().isEmpty())
+        assertEquals(0, host.syncedTabs?.size)
+    }
+
+    @Test
+    fun webGoBack_delegatesToHost() {
+        val host = FakeHost()
+        val bridge = JsBridge(
+            deviceWidthPx = 800, deviceHeightPx = 480, density = 2.0f, darkMode = true,
+            webAppContainer = WebAppContainer(), webAppHost = host,
+        )
+        bridge.webGoBack()
+        assertEquals(1, host.backCalls)
+    }
 }