Update UpdateManager.kt

src/android/app/src/main/java/org/yuzu/yuzu_emu/UpdateManager.kt

@@ -85,3 +85,85 @@ object UpdateManager {
     }
 }
 
+private fun showNoUpdateAvailableMessage(context: Context) {
+    Toast.makeText(
+        context, 
+        "您的应用已经是最新版本。",
+        Toast.LENGTH_SHORT
+    ).show()
+}
+
+private fun downloadAndInstallUpdate(context: Context) {
+    val downloadUrl =
+        "https://your-server.com/api/downloadLatestVersion" // 替换为实际的下载链接
+
+    val request = DownloadManager.Request(Uri.parse(downloadUrl))
+    request.apply {
+        setTitle("App更新")
+        setDescription("正在下载新版本...")
+        setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
+        setDestinationInExternalPublicDir(
+            Environment.DIRECTORY_DOWNLOADS,
+            "YourAppName.apk"
+        ) // 替换为您的应用名称
+    }
+
+    val downloadManager =
+        context.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
+    val downloadId = downloadManager.enqueue(request)
+
+    // 您可以存储下载ID并用于检查下载状态或处理重试
+
+    // 当下载完成时安装下载的APK
+    val onCompleteReceiver = DownloadCompleteReceiver()
+    onCompleteReceiver.setDownloadId(downloadId)
+    context.registerReceiver(
+        onCompleteReceiver,
+        IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE)
+    )
+}
+
+class DownloadCompleteReceiver : BroadcastReceiver() {
+    private var downloadId: Long = -1
+
+    fun setDownloadId(id: Long) {
+        downloadId = id
+    }
+
+    override fun onReceive(context: Context?, intent: Intent?) {
+        if (context == null || intent == null) {
+            return
+        }
+
+        if (intent.action == DownloadManager.ACTION_DOWNLOAD_COMPLETE) {
+            val downloadManager =
+                context.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
+            val query = DownloadManager.Query().setFilterById(downloadId)
+            val cursor = downloadManager.query(query)
+
+            if (cursor.moveToFirst()) {
+                val status =
+                    cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS))
+                if (status == DownloadManager.STATUS_SUCCESSFUL) {
+                    val uri = Uri.parse(
+                        cursor.getString(
+                            cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI)
+                        )
+                    )
+                    installApk(context, uri)
+                } else {
+                    // 处理下载失败
+                }
+            }
+
+            cursor.close()
+        }
+    }
+
+    private fun installApk(context: Context, uri: Uri) {
+        val intent = Intent(Intent.ACTION_VIEW)
+        intent.setDataAndType(uri, "application/vnd.android.package-archive")
+        intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK
+        context.startActivity(intent)
+    }
+}