diff --git a/app/src/main/java/io/legado/app/constant/AppConst.kt b/app/src/main/java/io/legado/app/constant/AppConst.kt
index 8e1ed60c5..7de237e42 100644
--- a/app/src/main/java/io/legado/app/constant/AppConst.kt
+++ b/app/src/main/java/io/legado/app/constant/AppConst.kt
@@ -60,7 +60,7 @@ object AppConst {
     val sysElevation = appCtx.resources.getDimension(R.dimen.design_appbar_elevation).toInt()
 
     val androidId: String by lazy {
-        Settings.System.getString(appCtx.contentResolver, Settings.Secure.ANDROID_ID)
+        Settings.System.getString(appCtx.contentResolver, Settings.Secure.ANDROID_ID) ?: "null"
     }
 
     val appInfo: AppInfo by lazy {
diff --git a/app/src/main/java/io/legado/app/utils/BitmapUtils.kt b/app/src/main/java/io/legado/app/utils/BitmapUtils.kt
index c237deba7..e2407c95e 100644
--- a/app/src/main/java/io/legado/app/utils/BitmapUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/BitmapUtils.kt
@@ -53,13 +53,13 @@ object BitmapUtils {
         height: Int? = null
     ): Int {
         //获取比例大小
-        val wRatio = width?.let { ceil((options.outWidth / it).toDouble()).toInt() } ?: -1
-        val hRatio = height?.let { ceil((options.outHeight / it).toDouble()).toInt() } ?: -1
+        val wRatio = width?.let { ceil((options.outWidth / it.toFloat())).toInt() } ?: -1
+        val hRatio = height?.let { ceil((options.outHeight / it.toFloat())).toInt() } ?: -1
         //如果超出指定大小，则缩小相应的比例
         return when {
             wRatio > 1 && hRatio > 1 -> max(wRatio, hRatio)
             wRatio > 1 -> wRatio
-            hRatio > 1  -> hRatio
+            hRatio > 1 -> hRatio
             else -> 1
         }
     }