优化

app/src/main/java/io/legado/app/ui/book/read/config/BgTextConfigDialog.kt

@@ -47,12 +47,12 @@ class BgTextConfigDialog : BaseDialogFragment() {
     private var secondaryTextColor = 0
     private val importFormNet = "网络导入"
     private val selectBgImage = registerForActivityResult(ActivityResultContracts.GetContent()) {
+        it ?: return@registerForActivityResult
         setBgFromUri(it)
     }
     private val selectExportDir = registerForActivityResult(FilePicker()) {
-        it?.let {
-            exportConfig(it)
-        }
+        it ?: return@registerForActivityResult
+        exportConfig(it)
     }
     private val selectImportDoc = registerForActivityResult(FilePicker()) {
         it ?: return@registerForActivityResult

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

@@ -12,7 +12,6 @@ import io.legado.app.help.DefaultData
 import io.legado.app.help.LocalConfig
 import io.legado.app.model.webBook.WebBook
 import io.legado.app.service.help.CacheBook
-import io.legado.app.utils.FileUtils
 import io.legado.app.utils.postEvent
 import kotlinx.coroutines.asCoroutineDispatcher
 import kotlinx.coroutines.delay
@@ -143,7 +142,6 @@ class MainViewModel(application: Application) : BaseViewModel(application) {
 
     fun postLoad() {
         execute {
-            FileUtils.deleteFile(FileUtils.getPath(context.cacheDir, "Fonts"))
             if (appDb.httpTTSDao.count == 0) {
                 DefaultData.httpTTS.let {
                     appDb.httpTTSDao.insert(*it.toTypedArray())