fix black theme on Android 12 (#2424)

* fix black theme on Android 12

* Revert "fix black theme on Android 12"

This reverts commit 2286706fdb239e15be72ac8943405ffeb2258219.

* bring back SplashActivity

app/src/main/java/com/keylesspalace/tusky/SplashActivity.kt

@@ -0,0 +1,51 @@
+/* Copyright 2018 Conny Duck
+ *
+ * This file is a part of Tusky.
+ *
+ * This program is free software; you can redistribute it and/or modify it under the terms of the
+ * GNU General Public License as published by the Free Software Foundation; either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+ * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+ * Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with Tusky; if not,
+ * see <http://www.gnu.org/licenses>. */
+
+package com.keylesspalace.tusky
+
+import android.annotation.SuppressLint
+import android.content.Intent
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import com.keylesspalace.tusky.components.login.LoginActivity
+import com.keylesspalace.tusky.components.notifications.NotificationHelper
+import com.keylesspalace.tusky.db.AccountManager
+import com.keylesspalace.tusky.di.Injectable
+import javax.inject.Inject
+
+@SuppressLint("CustomSplashScreen")
+class SplashActivity : AppCompatActivity(), Injectable {
+
+    @Inject
+    lateinit var accountManager: AccountManager
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        /** delete old notification channels */
+        NotificationHelper.deleteLegacyNotificationChannels(this, accountManager)
+
+        /** Determine whether the user is currently logged in, and if so go ahead and load the
+         *  timeline. Otherwise, start the activity_login screen. */
+
+        val intent = if (accountManager.activeAccount != null) {
+            Intent(this, MainActivity::class.java)
+        } else {
+            LoginActivity.getIntent(this, false)
+        }
+        startActivity(intent)
+        finish()
+    }
+}