Resolve #842

app/src/main/AndroidManifest.xml

@@ -36,7 +36,7 @@
         <activity
             android:name=".ui.login.LoginActivity"
             android:exported="false"
-            android:theme="@style/AppTheme"
+            android:launchMode="singleTask"
             android:windowSoftInputMode="adjustResize"/>
         <activity
             android:name=".ui.MainActivity"

app/src/main/java/com/hippo/ehviewer/ui/MainActivity.kt

@@ -233,13 +233,7 @@ class MainActivity : EhActivity() {
         val navHostFragment =
             supportFragmentManager.findFragmentById(R.id.fragment_container) as NavHostFragment
         navController = navHostFragment.navController
-        if (EhUtils.needSignedIn()) {
-            registerForActivityResult(ActivityResultContracts.StartActivityForResult()) {
-                setNavGraph()
-            }.launch(Intent(this, LoginActivity::class.java))
-        } else {
-            setNavGraph()
-        }
+        if (!EhUtils.needSignedIn()) setNavGraph()
         binding.drawView.addDrawerListener(mDrawerOnBackPressedCallback)
         binding.navView.setupWithNavController(navController)
 
@@ -371,7 +365,12 @@ class MainActivity : EhActivity() {
         }
     }
 
+    private val loginLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { setNavGraph() }
+
     override fun onResume() {
+        if (EhUtils.needSignedIn()) {
+            loginLauncher.launch(Intent(this, LoginActivity::class.java))
+        }
         super.onResume()
         lifecycleScope.launch {
             delay(100)