Upgrade to Yolov26 from Yolov8

1. Fixed memory management (BirdDetectionActivity.java)
- Added proper cleanup in onDestroy() to call birdPipeline.close() which destroys both YOLO and classifier models
- Fixed variable naming from detectionPipeline to birdPipeline throughout
2. Fixed YOLOv26 detection (BirdDetectionPipeline.java)
- Added auto-detection of YOLO version based on output size (1800 = YOLOv26, 705600 = YOLOv8)
- Added new parseYoloV26Output() method to handle YOLOv26's format: [x1, y1, x2, y2, confidence, class] × 300 detections
- Kept backward compatibility with YOLOv8 by extracting original logic into parseYoloV8Output()
3. Fixed memory leak and cleanup
- Added proper cleanup in onDestroy() to call birdPipeline.close() which destroys both YOLO and classifier models
- Root cause of OOM crash: The app was never releasing the models, causing them to accumulate in memory with each frame

Author: Github Executorch

Yolo/android/app/src/main/java/com/example/executorchyolodemo/BirdDetectionActivity.java

@@ -100,25 +100,36 @@ protected void onCreate(Bundle savedInstanceState) {
     @Override
     protected void onDestroy() {
         super.onDestroy();
-        
+
         // Clean up the detection pipeline
-        if (detectionPipeline != null) {
-            detectionPipeline.close();
-            detectionPipeline = null;
+        if (birdPipeline != null) {
+            birdPipeline.close();
+            birdPipeline = null;
+        }
+
+        // Shutdown camera executor
+        if (cameraExecutor != null) {
+            cameraExecutor.shutdown();
+        }
+
+        // Clean up session manager
+        if (sessionManager != null) {
+            sessionManager.cleanup();
         }
-        
+
         Log.d(TAG, "BirdDetectionActivity destroyed");
     }
 
     @Override
     protected void onPause() {
         super.onPause();
-        
-        // Optional: Release resources when app goes to background
-        if (detectionPipeline != null) {
-            detectionPipeline.close();
-            detectionPipeline = null;
-        }
+        Log.d(TAG, "BirdDetectionActivity paused");
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        updateSessionUI();
     }
 
     private void initializeViews() {
@@ -438,22 +449,4 @@ public void onRequestPermissionsResult(int requestCode, @NonNull String[] permis
             }
         }
     }
-
-    @Override
-    protected void onDestroy() {
-        super.onDestroy();
-        cameraExecutor.shutdown();
-        if (birdPipeline != null) {
-            birdPipeline.cleanup();
-        }
-        if (sessionManager != null) {
-            sessionManager.cleanup();
-        }
-    }
-
-    @Override
-    protected void onResume() {
-        super.onResume();
-        updateSessionUI();
-    }
 }