feat: Stabilize conditional toast with ActivityManager

This change stabilizes the logic for showing the 'The AI stopped Screen Operator' toast.

The previous implementation, which relied on lifecycle callbacks in `MainActivity`, was prone to timing issues. This commit refactors the implementation to use `ActivityManager` directly within the `BroadcastReceiver` in `PhotoReasoningViewModel`.

This ensures that the foreground check is performed at the exact moment the AI response is received, providing a reliable and stable solution.

The changes in `MainActivity.kt` have been reverted.

Author: google-labs-jules[bot]

app/src/main/kotlin/com/google/ai/sample/MainActivity.kt

@@ -1044,7 +1044,6 @@ class MainActivity : ComponentActivity() {
     override fun onResume() {
         Log.d(TAG, "onResume: Activity resuming.")
         super.onResume()
-        isInForeground = true // Setze Flag: App ist sichtbar
         instance = this
         Log.d(TAG, "onResume: MainActivity instance set.")
         Log.d(TAG, "onResume: Calling refreshAccessibilityServiceStatus.")
@@ -1069,12 +1068,6 @@ class MainActivity : ComponentActivity() {
         Log.d(TAG, "onResume: Finished.")
     }
 
-    override fun onPause() {
-        super.onPause()
-        isInForeground = false // Setze Flag: App geht in den Hintergrund
-        Log.d(TAG, "onPause: App is no longer in foreground.")
-    }
-
     override fun onDestroy() {
         Log.d(TAG, "onDestroy: Activity destroying.")
         super.onDestroy()
@@ -1141,7 +1134,6 @@ class MainActivity : ComponentActivity() {
         const val EXTRA_SCREEN_INFO = "com.google.ai.sample.EXTRA_SCREEN_INFO"
     }
 
-    var isInForeground: Boolean = false // Neue public Flag für Vordergrund-Status
 
     override fun onNewIntent(intent: Intent?) {
         super.onNewIntent(intent)

app/src/main/kotlin/com/google/ai/sample/feature/multimodal/PhotoReasoningViewModel.kt

@@ -1,7 +1,7 @@
 package com.google.ai.sample.feature.multimodal
 
 import android.app.ActivityManager
-import android.app.ActivityManager.RunningAppProcessInfo // Für IMPORTANCE_FOREGROUND
+import android.app.ActivityManager.RunningAppProcessInfo
 import android.content.Context
 import android.graphics.Bitmap
 import android.content.BroadcastReceiver
@@ -144,8 +144,14 @@ class PhotoReasoningViewModel(
                     updateAiMessage(responseText) // Existing method to update chat history
                     processCommands(responseText) // Existing method
                     if (!responseText.contains("takeScreenshot()", ignoreCase = true)) {
-                        val mainActivity = MainActivity.getInstance()
-                        if (mainActivity != null && !mainActivity.isInForeground) {
+                        // Stabile Prüfung, ob die App im Vordergrund ist
+                        val activityManager = receiverContext.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
+                        val runningProcesses = activityManager.runningAppProcesses ?: emptyList<RunningAppProcessInfo>()
+                        val isInForeground = runningProcesses.any { process ->
+                            process.processName == receiverContext.packageName && process.importance == RunningAppProcessInfo.IMPORTANCE_FOREGROUND
+                        }
+                        Log.d(TAG, "Foreground check: isInForeground = $isInForeground") // Debugging-Log (kann später entfernt werden)
+                        if (!isInForeground) {
                             Toast.makeText(receiverContext, "The AI stopped Screen Operator", Toast.LENGTH_SHORT).show()
                         }
                     }