feat: 优化代码

app/src/main/java/io/legado/app/ui/book/search/SearchViewModel.kt

@@ -16,7 +16,6 @@ import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.asCoroutineDispatcher
 import kotlinx.coroutines.isActive
-import kotlinx.coroutines.launch
 import java.util.concurrent.Executors
 
 class SearchViewModel(application: Application) : BaseViewModel(application) {
@@ -34,10 +33,9 @@ class SearchViewModel(application: Application) : BaseViewModel(application) {
      * 开始搜索
      */
     fun search(key: String) {
-        launch {
         task?.cancel()
         if (key.isEmpty() && searchKey.isEmpty()) {
-                return@launch
+            return
         } else if (key.isEmpty()) {
             isLoading = true
             searchPage++
@@ -88,7 +86,6 @@ class SearchViewModel(application: Application) : BaseViewModel(application) {
             isLoading = false
         }
     }
-    }
 
     /**
      * 精确搜索处理