优化

app/src/main/java/io/legado/app/help/storage/AppWebDav.kt

@@ -119,7 +119,7 @@ object AppWebDav {
     }
 
     @Throws(WebDavException::class)
-    private suspend fun restoreWebDav(name: String) {
+    suspend fun restoreWebDav(name: String) {
         authorization?.let {
             val webDav = WebDav(rootWebDavUrl + name, it)
             webDav.downloadTo(zipFilePath, true)
@@ -138,21 +138,22 @@ object AppWebDav {
         return false
     }
 
-    suspend fun lastBackUp(): WebDavFile? {
-        authorization?.let {
-            var lastBackupFile: WebDavFile? = null
-            WebDav(rootWebDavUrl, it).listFiles().forEach { webDavFile ->
-                if (webDavFile.displayName.startsWith("backup")) {
-                    if (lastBackupFile == null
-                        || webDavFile.lastModify > lastBackupFile!!.lastModify
-                    ) {
-                        lastBackupFile = webDavFile
+    suspend fun lastBackUp(): Result<WebDavFile?> {
+        return kotlin.runCatching {
+            authorization?.let {
+                var lastBackupFile: WebDavFile? = null
+                WebDav(rootWebDavUrl, it).listFiles().forEach { webDavFile ->
+                    if (webDavFile.displayName.startsWith("backup")) {
+                        if (lastBackupFile == null
+                            || webDavFile.lastModify > lastBackupFile!!.lastModify
+                        ) {
+                            lastBackupFile = webDavFile
+                        }
                     }
                 }
+                lastBackupFile
             }
-            return lastBackupFile
         }
-        return null
     }
 
     @Throws(Exception::class)

app/src/main/java/io/legado/app/ui/main/MainActivity.kt

@@ -3,6 +3,7 @@
 package io.legado.app.ui.main
 
 import android.os.Bundle
+import android.text.format.DateUtils
 import android.view.KeyEvent
 import android.view.MenuItem
 import android.view.ViewGroup
@@ -23,7 +24,9 @@ import io.legado.app.help.BookHelp
 import io.legado.app.help.config.AppConfig
 import io.legado.app.help.config.LocalConfig
 import io.legado.app.help.coroutine.Coroutine
+import io.legado.app.help.storage.AppWebDav
 import io.legado.app.help.storage.Backup
+import io.legado.app.lib.dialogs.alert
 import io.legado.app.lib.theme.elevation
 import io.legado.app.lib.theme.primaryColor
 import io.legado.app.service.BaseReadAloudService
@@ -39,6 +42,9 @@ import io.legado.app.utils.setEdgeEffectColor
 import io.legado.app.utils.showDialogFragment
 import io.legado.app.utils.toastOnUi
 import io.legado.app.utils.viewbindingdelegate.viewBinding
+import kotlinx.coroutines.Dispatchers.IO
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 
 /**
  * 主界面
@@ -88,6 +94,20 @@ class MainActivity : VMBaseActivity<ActivityMainBinding, MainViewModel>(),
         binding.viewPagerMain.postDelayed({
             viewModel.postLoad()
         }, 3000)
+        launch {
+            val lastBackupFile = withContext(IO) { AppWebDav.lastBackUp().getOrNull() }
+            if (System.currentTimeMillis() - LocalConfig.lastBackup > DateUtils.MINUTE_IN_MILLIS
+                && lastBackupFile != null
+            ) {
+
+                alert("恢复", "webDav书源比本地新,是否恢复") {
+                    cancelButton()
+                    okButton {
+                        viewModel.restoreWebDav(lastBackupFile.displayName)
+                    }
+                }
+            }
+        }
     }
 
     override fun onNavigationItemSelected(item: MenuItem): Boolean = binding.run {

app/src/main/java/io/legado/app/ui/main/MainViewModel.kt

@@ -13,6 +13,7 @@ import io.legado.app.data.entities.BookSource
 import io.legado.app.help.DefaultData
 import io.legado.app.help.config.AppConfig
 import io.legado.app.help.config.LocalConfig
+import io.legado.app.help.storage.AppWebDav
 import io.legado.app.model.CacheBook
 import io.legado.app.model.webBook.WebBook
 import io.legado.app.service.CacheBookService
@@ -195,6 +196,12 @@ class MainViewModel(application: Application) : BaseViewModel(application) {
         }
     }
 
+    fun restoreWebDav(name: String) {
+        execute {
+            AppWebDav.restoreWebDav(name)
+        }
+    }
+
     fun upVersion() {
         execute {
             if (LocalConfig.needUpHttpTTS) {