feat: 优化代码

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

@@ -76,32 +76,35 @@ object Backup {
         }
     }
 
+    @Throws(java.lang.Exception::class)
     private fun copyBackup(context: Context, uri: Uri) {
         DocumentFile.fromTreeUri(context, uri)?.let { treeDoc ->
             for (fileName in backupFileNames) {
+                val file = File(backupPath + File.separator + fileName)
+                if (file.exists()) {
                     val doc = treeDoc.findFile(fileName) ?: treeDoc.createFile("", fileName)
                     doc?.let {
                         DocumentUtils.writeText(
                             context,
-                        FileUtils.createFileIfNotExist(backupPath + File.separator + fileName).readText(),
+                            file.readText(),
                             doc.uri
                         )
                     }
                 }
             }
         }
+    }
 
-    private fun copyBackup(file: File) {
-        try {
+    @Throws(java.lang.Exception::class)
+    private fun copyBackup(rootFile: File) {
         for (fileName in backupFileNames) {
-                FileUtils.createFileIfNotExist(backupPath + File.separator + fileName)
-                    .copyTo(
-                        FileUtils.createFileIfNotExist(file, fileName),
+            val file = File(backupPath + File.separator + fileName)
+            if (file.exists()) {
+                file.copyTo(
+                    FileUtils.createFileIfNotExist(rootFile, fileName),
                     true
                 )
             }
-        } catch (e: Exception) {
-            e.printStackTrace()
         }
     }
 }