优化

app/src/main/java/io/legado/app/App.kt

@@ -37,11 +37,10 @@ class App : MultiDexApplication() {
             private set
 
         lateinit var androidId: String
+        var versionCode = 0
+        var versionName = ""
     }
 
-    var versionCode = 0
-    var versionName = ""
-
     override fun onCreate() {
         super.onCreate()
         INSTANCE = this

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

@@ -93,8 +93,8 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
     }
 
     private fun upVersion() {
-        if (getPrefInt(PreferKey.versionCode) != App.INSTANCE.versionCode) {
+        if (getPrefInt(PreferKey.versionCode) != App.versionCode) {
-            putPrefInt(PreferKey.versionCode, App.INSTANCE.versionCode)
+            putPrefInt(PreferKey.versionCode, App.versionCode)
             if (!BuildConfig.DEBUG) {
                 val log = String(assets.open("updateLog.md").readBytes())
                 TextDialog.show(supportFragmentManager, log, TextDialog.MD, 5000, true)