feat: page preload, card grid span, wallpaper into webview for glass blur

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

@@ -1,12 +1,16 @@
 package top.yeij.hearth
 
 import android.app.Activity
+import android.app.WallpaperManager
 import android.content.Intent
 import android.content.res.Configuration
+import android.graphics.Bitmap
+import android.graphics.Canvas
 import android.net.Uri
 import android.os.Bundle
 import android.provider.Settings
 import android.text.TextUtils
+import android.util.Base64
 import android.util.Log
 import android.view.View
 import android.view.ViewGroup
@@ -30,8 +34,10 @@ import top.yeij.hearth.webview.BrightnessProvider
 import top.yeij.hearth.webview.JsBridge
 import top.yeij.hearth.webview.NotificationAccessProvider
 import top.yeij.hearth.webview.ServerUrlProvider
+import top.yeij.hearth.webview.WallpaperProvider
 import top.yeij.hearth.webview.WebAppHost
 import top.yeij.hearth.webview.WebViewManager
+import java.io.ByteArrayOutputStream
 import java.io.File
 
 // HOME 桌面 activity，接线各能力层：Repository、媒体监听、多 WebView webAPP 管理
@@ -106,6 +112,35 @@ class MainActivity : Activity() {
         }
     }
 
+    // 壁纸提供实现：WallpaperManager 取当前壁纸转 base64，供 H5 body 背景使用
+    // Wallpaper implementation: WallpaperManager -> base64 for the H5 body background
+    private val wallpaperProvider = object : WallpaperProvider {
+        override fun getWallpaperBase64(): String {
+            return try {
+                val wm = WallpaperManager.getInstance(this@MainActivity)
+                // 动态壁纸（Live Wallpaper）是实时渲染、无静态 Drawable，返回空让 H5 保持
+                // 透明透出动态壁纸；此时玻璃模糊降级为普通半透明（backdrop-filter 无内容可模糊）
+                // Live wallpapers render in real time with no static drawable; return empty
+                // so H5 stays transparent and shows the live wallpaper, with the glass blur
+                // degrading to plain translucency (backdrop-filter has nothing to blur)
+                if (wm.wallpaperInfo != null) return ""
+                val d = wm.drawable ?: return ""
+                val dm = resources.displayMetrics
+                val bmp = Bitmap.createBitmap(dm.widthPixels, dm.heightPixels, Bitmap.Config.ARGB_8888)
+                val canvas = Canvas(bmp)
+                d.setBounds(0, 0, dm.widthPixels, dm.heightPixels)
+                d.draw(canvas)
+                val out = ByteArrayOutputStream()
+                bmp.compress(Bitmap.CompressFormat.JPEG, 80, out)
+                bmp.recycle()
+                "data:image/jpeg;base64," + Base64.encodeToString(out.toByteArray(), Base64.NO_WRAP)
+            } catch (e: Exception) {
+                Log.w(TAG, "getWallpaper: ${e.message}")
+                ""
+            }
+        }
+    }
+
     private lateinit var webAppRepository: WebAppRepository
     private lateinit var mediaSource: MediaSessionSource
     private lateinit var root: FrameLayout
@@ -155,6 +190,7 @@ class MainActivity : Activity() {
             notificationAccess = notificationAccess,
             brightness = brightnessProvider,
             serverUrl = serverUrlProvider,
+            wallpaper = wallpaperProvider,
         )
         root = FrameLayout(this)
         setContentView(root)

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

@@ -36,6 +36,14 @@ interface ServerUrlProvider {
     fun setServerUrl(url: String)
 }
 
+// 壁纸提供接口：由 MainActivity 实现（WallpaperManager 转 base64），
+// 让壁纸进入 WebView 内部，backdrop-filter 玻璃才能模糊到壁纸
+// Wallpaper provider implemented by MainActivity (WallpaperManager -> base64), so the
+// wallpaper lives inside the WebView and the glass backdrop-filter can blur it
+interface WallpaperProvider {
+    fun getWallpaperBase64(): String
+}
+
 class JsBridge(
     private val deviceWidthPx: Int,
     private val deviceHeightPx: Int,
@@ -58,6 +66,9 @@ class JsBridge(
     // 服务器地址存储接口
     // Server URL storage provider
     private val serverUrl: ServerUrlProvider? = null,
+    // 壁纸提供接口（base64）
+    // Wallpaper provider (base64)
+    private val wallpaper: WallpaperProvider? = null,
 ) {
     private val gson = com.google.gson.Gson()
 
@@ -270,6 +281,11 @@ class JsBridge(
         serverUrl?.setServerUrl(url)
     }
 
+    // 返回壁纸 base64（data URI，未接入返回空字符串）
+    // Return the wallpaper base64 (data URI; empty string when not wired)
+    @android.webkit.JavascriptInterface
+    fun getWallpaper(): String = wallpaper?.getWallpaperBase64() ?: ""
+
     // 重新拉取 webAPP 清单 + 卡片目录，返回 { count }
     // Re-fetch the webAPP manifest + card catalog, return { count }
     @android.webkit.JavascriptInterface