feat: added delay

Author: CodingWithTashi

android/src/main/java/com/amolg/flutterbarcodescanner/BarcodeCaptureActivity.java

@@ -203,12 +203,15 @@ public boolean onTouchEvent(MotionEvent e) {
     private void createCameraSource(boolean autoFocus, boolean useFlash, int cameraFacing) {
         Context context = getApplicationContext();
 
+        int delayMillis = (int) getIntent().getIntExtra("delayMillis", 0);
+
         // A barcode detector is created to track barcodes.  An associated multi-processor instance
         // is set to receive the barcode detection results, track the barcodes, and maintain
         // graphics for each barcode on screen.  The factory is used by the multi-processor to
         // create a separate tracker instance for each barcode.
         BarcodeDetector barcodeDetector = new BarcodeDetector.Builder(context).build();
-        BarcodeTrackerFactory barcodeFactory = new BarcodeTrackerFactory(mGraphicOverlay, this);
+        Log.d("BarcodeCaptureActivity", "Barcode detector set up:"+delayMillis);
+        BarcodeTrackerFactory barcodeFactory = new BarcodeTrackerFactory(mGraphicOverlay, this,delayMillis);
         barcodeDetector.setProcessor(
                 new MultiProcessor.Builder<>(barcodeFactory).build());
 

android/src/main/java/com/amolg/flutterbarcodescanner/BarcodeGraphicTracker.java

@@ -16,6 +16,10 @@
 package com.amolg.flutterbarcodescanner;
 
 import android.content.Context;
+import android.os.Handler;
+import android.os.Looper;
+import android.util.Log;
+
 import androidx.annotation.UiThread;
 
 import com.amolg.flutterbarcodescanner.camera.GraphicOverlay;
@@ -32,8 +36,10 @@
 public class BarcodeGraphicTracker extends Tracker<Barcode> {
     private GraphicOverlay<BarcodeGraphic> mOverlay;
     private BarcodeGraphic mGraphic;
-
+    private int delayMillis;
     private BarcodeUpdateListener mBarcodeUpdateListener;
+    private Handler handler;
+    private boolean isWaiting = false;
 
     /**
      * Consume the item instance detected from an Activity or Fragment level by implementing the
@@ -44,9 +50,11 @@ public interface BarcodeUpdateListener {
         void onBarcodeDetected(Barcode barcode);
     }
 
-    BarcodeGraphicTracker(GraphicOverlay<BarcodeGraphic> mOverlay, BarcodeGraphic mGraphic, Context context) {
+    BarcodeGraphicTracker(GraphicOverlay<BarcodeGraphic> mOverlay, BarcodeGraphic mGraphic, Context context, int delayMillis) {
         this.mOverlay = mOverlay;
         this.mGraphic = mGraphic;
+        this.delayMillis = delayMillis;
+        this.handler = new Handler(Looper.getMainLooper());
         if (context instanceof BarcodeUpdateListener) {
             this.mBarcodeUpdateListener = (BarcodeUpdateListener) context;
         } else {
@@ -60,7 +68,7 @@ public interface BarcodeUpdateListener {
     @Override
     public void onNewItem(int id, Barcode item) {
         mGraphic.setId(id);
-        mBarcodeUpdateListener.onBarcodeDetected(item);
+        processDetection(item);
     }
 
     /**
@@ -70,6 +78,24 @@ public void onNewItem(int id, Barcode item) {
     public void onUpdate(Detector.Detections<Barcode> detectionResults, Barcode item) {
         mOverlay.add(mGraphic);
         mGraphic.updateItem(item);
+        processDetection(item);
+    }
+
+    private void processDetection(final Barcode item) {
+        if (!isWaiting) {
+            isWaiting = true;
+            Log.d("BarcodeGraphicTracker", "Barcode detected, waiting for " + delayMillis + "ms");
+            handler.postDelayed(new Runnable() {
+                @Override
+                public void run() {
+                    mBarcodeUpdateListener.onBarcodeDetected(item);
+                    isWaiting = false;
+                    Log.d("BarcodeGraphicTracker", "Delay completed, barcode processed");
+                }
+            }, delayMillis);
+        } else {
+            Log.d("BarcodeGraphicTracker", "Still waiting, ignoring new detection");
+        }
     }
 
     /**
@@ -90,4 +116,4 @@ public void onMissing(Detector.Detections<Barcode> detectionResults) {
     public void onDone() {
         mOverlay.remove(mGraphic);
     }
-}
+}

android/src/main/java/com/amolg/flutterbarcodescanner/BarcodeTrackerFactory.java

@@ -29,15 +29,17 @@
 class BarcodeTrackerFactory implements MultiProcessor.Factory<Barcode> {
     private GraphicOverlay<BarcodeGraphic> mGraphicOverlay;
     private Context mContext;
+    private int delayMillis;
 
-    public BarcodeTrackerFactory(GraphicOverlay<BarcodeGraphic> mGraphicOverlay, Context mContext) {
+    public BarcodeTrackerFactory(GraphicOverlay<BarcodeGraphic> mGraphicOverlay, Context mContext, int delayMillis) {
         this.mGraphicOverlay = mGraphicOverlay;
         this.mContext = mContext;
+        this.delayMillis = delayMillis;
     }
 
     @Override
     public Tracker<Barcode> create(Barcode barcode) {
         BarcodeGraphic graphic = new BarcodeGraphic(mGraphicOverlay);
-        return new BarcodeGraphicTracker(mGraphicOverlay, graphic, mContext);
+        return new BarcodeGraphicTracker(mGraphicOverlay, graphic, mContext,delayMillis);
     }
 }

android/src/main/java/com/amolg/flutterbarcodescanner/FlutterBarcodeScannerPlugin.java

@@ -48,6 +48,7 @@ public class FlutterBarcodeScannerPlugin implements MethodCallHandler, ActivityR
     public static String lineColor = "";
     public static boolean isShowFlashIcon = false;
     public static boolean isContinuousScan = false;
+    public static int delayMillis = 0;
     static EventChannel.EventSink barcodeStream;
     private EventChannel eventChannel;
 
@@ -115,6 +116,10 @@ public void onMethodCall(@NonNull MethodCall call, @NonNull Result result) {
 
                 isContinuousScan = (boolean) arguments.get("isContinuousScan");
 
+                if (null != arguments.get("delayMillis"))
+                    delayMillis = (int) arguments.get("delayMillis");
+
+
                 startBarcodeScannerActivityView((String) arguments.get("cancelButtonText"), isContinuousScan);
             }
         } catch (Exception e) {
@@ -124,7 +129,8 @@ public void onMethodCall(@NonNull MethodCall call, @NonNull Result result) {
 
     private void startBarcodeScannerActivityView(String buttonText, boolean isContinuousScan) {
         try {
-            Intent intent = new Intent(activity, BarcodeCaptureActivity.class).putExtra("cancelButtonText", buttonText);
+            Intent intent = new Intent(activity, BarcodeCaptureActivity.class).putExtra("cancelButtonText", buttonText)
+                    .putExtra("delayMillis", delayMillis);
             if (isContinuousScan) {
                 activity.startActivity(intent);
             } else {

lib/flutter_barcode_scanner.dart

@@ -26,7 +26,7 @@ class FlutterBarcodeScanner {
   /// displayed if [isShowFlashIcon] is true. The text of the cancel button can
   /// be customized with the [cancelButtonText] string.
   static Future<String> scanBarcode(String lineColor, String cancelButtonText,
-      bool isShowFlashIcon, ScanMode scanMode) async {
+      bool isShowFlashIcon, ScanMode scanMode, int? delayMillis) async {
     if (cancelButtonText.isEmpty) {
       cancelButtonText = 'Cancel';
     }
@@ -37,7 +37,8 @@ class FlutterBarcodeScanner {
       'cancelButtonText': cancelButtonText,
       'isShowFlashIcon': isShowFlashIcon,
       'isContinuousScan': false,
-      'scanMode': scanMode.index
+      'scanMode': scanMode.index,
+      'delayMillis': delayMillis ?? 0
     };
 
     /// Get barcode scan result

lib/screens/io_device.dart

@@ -18,6 +18,7 @@ class BarcodeScanner extends StatelessWidget {
   final bool? centerTitle;
   final Widget? child;
   final BarcodeAppBar? barcodeAppBar;
+  final int? delayMillis;
 
   const BarcodeScanner({
     super.key,
@@ -30,6 +31,7 @@ class BarcodeScanner extends StatelessWidget {
     this.appBarTitle,
     this.centerTitle,
     this.barcodeAppBar,
+    this.delayMillis,
   });
 
   @override
@@ -44,6 +46,7 @@ class BarcodeScanner extends StatelessWidget {
         onScanned: onScanned,
         appBarTitle: appBarTitle,
         centerTitle: centerTitle,
+        delayMillis: delayMillis,
       );
     } else {
       /// Scan Android and ios barcode scanner with flutter_barcode_scanner
@@ -71,7 +74,7 @@ class BarcodeScanner extends StatelessWidget {
         break;
     }
     String barcode = await FlutterBarcodeScanner.scanBarcode(
-        lineColor, cancelButtonText, isShowFlashIcon, scanMode);
+        lineColor, cancelButtonText, isShowFlashIcon, scanMode, delayMillis);
     onScanned(barcode);
   }
 }

lib/screens/unsupported.dart

@@ -12,6 +12,7 @@ class BarcodeScanner extends StatelessWidget {
   final bool? centerTitle;
   final Widget? child;
   final BarcodeAppBar? barcodeAppBar;
+  final int? delayMillis;
   const BarcodeScanner(
       {super.key,
       this.lineColor = "#ff6666",
@@ -22,7 +23,8 @@ class BarcodeScanner extends StatelessWidget {
       this.appBarTitle,
       this.child,
       this.centerTitle,
-      this.barcodeAppBar});
+      this.barcodeAppBar,
+      this.delayMillis});
 
   @override
   Widget build(BuildContext context) {

lib/screens/web.dart

@@ -19,6 +19,7 @@ class BarcodeScanner extends StatelessWidget {
   final bool? centerTitle;
   final Widget? child;
   final BarcodeAppBar? barcodeAppBar;
+  final int? delayMillis;
 
   const BarcodeScanner({
     super.key,
@@ -31,6 +32,7 @@ class BarcodeScanner extends StatelessWidget {
     this.centerTitle,
     this.child,
     this.barcodeAppBar,
+    this.delayMillis,
   });
 
   @override

lib/screens/window.dart

@@ -19,6 +19,7 @@ class WindowBarcodeScanner extends StatelessWidget {
   final String? appBarTitle;
   final bool? centerTitle;
   final BarcodeAppBar? barcodeAppBar;
+  final int? delayMillis;
 
   const WindowBarcodeScanner({
     super.key,
@@ -30,6 +31,7 @@ class WindowBarcodeScanner extends StatelessWidget {
     this.appBarTitle,
     this.centerTitle,
     this.barcodeAppBar,
+    this.delayMillis,
   });
 
   @override

lib/simple_barcode_scanner.dart

@@ -30,6 +30,9 @@ class SimpleBarcodeScannerPage extends StatelessWidget {
 
   final BarcodeAppBar? barcodeAppBar;
 
+  /// Delay in milliseconds to start the scanner
+  final int? delayMillis;
+
   /// Specify a child widget to be positioned beneath the scanner.
   /// This is beneficial when you need to include a customized text field
   /// for manual entry of barcode/QR code.
@@ -66,7 +69,8 @@ class SimpleBarcodeScannerPage extends StatelessWidget {
           'Use BarcodeAppBar instead. This field will be removed in future versions.')
       this.centerTitle,
       this.child,
-      this.barcodeAppBar});
+      this.barcodeAppBar,
+        this.delayMillis});
 
   @override
   Widget build(BuildContext context) {
@@ -85,6 +89,7 @@ class SimpleBarcodeScannerPage extends StatelessWidget {
       appBarTitle: appBarTitle,
       centerTitle: centerTitle,
       barcodeAppBar: barcodeAppBar,
+      delayMillis: delayMillis,
       child: child,
       onScanned: (res) {
         Navigator.pop(context, res);