优化

app/src/main/java/io/legado/app/service/CheckSourceService.kt

@@ -146,7 +146,7 @@ class CheckSourceService : BaseService() {
                 if (source.hasGroup("搜索失效") && url.isNullOrBlank()) {
                     throw NoStackTraceException("搜索内容为空并且没有发现")
                 }
-                books = WebBook.exploreBookAwait(this, source, url)
+                books = WebBook.exploreBookAwait(this, source, url!!)
                 if (books.isEmpty()) {
                     throw NoStackTraceException("发现书籍为空")
                 }

app/src/main/java/io/legado/app/ui/association/FileAssociationActivity.kt

@@ -137,7 +137,13 @@ class FileAssociationActivity :
                     }
                 }
             }.onFailure {
-                toastOnUi(it.localizedMessage)
+                when (it) {
+                    is SecurityException -> localBookTreeSelect.launch {
+                        title = "选择保存书籍的文件夹"
+                        mode = HandleFileContract.DIR_SYS
+                    }
+                    else -> toastOnUi(it.localizedMessage)
+                }
             }
         }
     }

app/src/main/java/io/legado/app/utils/ToastUtils.kt

@@ -10,6 +10,7 @@ private var toast: Toast? = null
 
 fun Context.toastOnUi(message: Int) {
     runOnUI {
+        kotlin.runCatching {
             if (toast == null) {
                 toast = Toast.makeText(this, message, Toast.LENGTH_SHORT)
             } else {
@@ -18,10 +19,12 @@ fun Context.toastOnUi(message: Int) {
             }
             toast?.show()
         }
+    }
 }
 
 fun Context.toastOnUi(message: CharSequence?) {
     runOnUI {
+        kotlin.runCatching {
             if (toast == null) {
                 toast = Toast.makeText(this, message, Toast.LENGTH_SHORT)
             } else {
@@ -30,10 +33,12 @@ fun Context.toastOnUi(message: CharSequence?) {
             }
             toast?.show()
         }
+    }
 }
 
 fun Context.longToastOnUi(message: Int) {
     runOnUI {
+        kotlin.runCatching {
             if (toast == null) {
                 toast = Toast.makeText(this, message, Toast.LENGTH_LONG)
             } else {
@@ -42,10 +47,12 @@ fun Context.longToastOnUi(message: Int) {
             }
             toast?.show()
         }
+    }
 }
 
 fun Context.longToastOnUi(message: CharSequence?) {
     runOnUI {
+        kotlin.runCatching {
             if (toast == null) {
                 toast = Toast.makeText(this, message, Toast.LENGTH_LONG)
             } else {
@@ -54,6 +61,7 @@ fun Context.longToastOnUi(message: CharSequence?) {
             }
             toast?.show()
         }
+    }
 }