manager: Fixed flickering on activity refresh using a clever method.

- Add Activity lifecycle callback and method to refresh current Activity

manager/app/src/main/java/com/sukisu/ultra/KernelSUApplication.kt

@@ -1,11 +1,14 @@
 package com.sukisu.ultra
 
 import android.annotation.SuppressLint
+import android.app.Activity
+import android.app.ActivityOptions
 import android.app.Application
 import android.content.Context
 import android.content.res.Configuration
 import android.content.res.Resources
 import android.os.Build
+import android.os.Bundle
 import coil.Coil
 import coil.ImageLoader
 import com.dergoogler.mmrl.platform.Platform
@@ -14,9 +17,31 @@ import me.zhanghai.android.appiconloader.coil.AppIconKeyer
 import java.io.File
 import java.util.Locale
 
+@SuppressLint("StaticFieldLeak")
 lateinit var ksuApp: KernelSUApplication
 
 class KernelSUApplication : Application() {
+    private var currentActivity: Activity? = null
+
+    private val activityLifecycleCallbacks = object : ActivityLifecycleCallbacks {
+        override fun onActivityCreated(activity: Activity, savedInstanceState: Bundle?) {
+            currentActivity = activity
+        }
+        override fun onActivityStarted(activity: Activity) {
+            currentActivity = activity
+        }
+        override fun onActivityResumed(activity: Activity) {
+            currentActivity = activity
+        }
+        override fun onActivityPaused(activity: Activity) {}
+        override fun onActivityStopped(activity: Activity) {}
+        override fun onActivitySaveInstanceState(activity: Activity, outState: Bundle) {}
+        override fun onActivityDestroyed(activity: Activity) {
+            if (currentActivity == activity) {
+                currentActivity = null
+            }
+        }
+    }
 
     override fun attachBaseContext(base: Context) {
         val prefs = base.getSharedPreferences("settings", MODE_PRIVATE)
@@ -62,6 +87,9 @@ class KernelSUApplication : Application() {
         super.onCreate()
         ksuApp = this
 
+        // 注册Activity生命周期回调
+        registerActivityLifecycleCallbacks(activityLifecycleCallbacks)
+
         Platform.setHiddenApiExemptions()
 
         val context = this
@@ -107,4 +135,17 @@ class KernelSUApplication : Application() {
             }
         }
     }
-}
+
+    // 添加刷新当前Activity的方法
+    fun refreshCurrentActivity() {
+        currentActivity?.let { activity ->
+            val intent = activity.intent
+            activity.finish()
+
+            val options = ActivityOptions.makeCustomAnimation(
+                activity, android.R.anim.fade_in, android.R.anim.fade_out
+            )
+            activity.startActivity(intent, options.toBundle())
+        }
+    }
+}