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CodingWithTashiCodingWithTashi
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barcode widget added
1 parent 36f677b commit 7bf735c

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8 files changed

+624
-3
lines changed

8 files changed

+624
-3
lines changed

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

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@@ -11,6 +11,7 @@
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import androidx.lifecycle.Lifecycle;
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import androidx.lifecycle.LifecycleOwner;
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import com.amolg.flutterbarcodescanner.widget.BarcodeViewFactory;
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import com.google.android.gms.common.api.CommonStatusCodes;
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import com.google.android.gms.vision.barcode.Barcode;
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@@ -220,6 +221,10 @@ public void run() {
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@Override
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public void onAttachedToEngine(FlutterPluginBinding binding) {
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pluginBinding = binding;
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binding.getPlatformViewRegistry().registerViewFactory(
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"plugins.codingwithtashi/barcode_scanner_view",
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new BarcodeViewFactory(binding.getBinaryMessenger())
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);
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}
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@Override

‎android/src/main/java/com/amolg/flutterbarcodescanner/widget/BarcodeViewFactory.java‎

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package com.amolg.flutterbarcodescanner.widget;
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import android.content.Context;
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import io.flutter.plugin.common.BinaryMessenger;
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import io.flutter.plugin.platform.PlatformView;
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import io.flutter.plugin.platform.PlatformViewFactory;
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import io.flutter.plugin.common.StandardMessageCodec;
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public class BarcodeViewFactory extends PlatformViewFactory {
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private final BinaryMessenger messenger;
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public BarcodeViewFactory(BinaryMessenger messenger) {
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super(StandardMessageCodec.INSTANCE);
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this.messenger = messenger;
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}
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@Override
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public PlatformView create(Context context, int id, Object args) {
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return new FlutterBarcodeView(context, messenger, id);
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}
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}

‎android/src/main/java/com/amolg/flutterbarcodescanner/widget/FlutterBarcodeView.java‎

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package com.amolg.flutterbarcodescanner.widget;
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import android.content.Context;
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import android.hardware.Camera;
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import android.view.View;
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import android.util.Log;
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import android.view.SurfaceHolder;
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import android.view.SurfaceView;
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import android.os.Handler;
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import android.os.Looper;
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import android.view.ViewGroup;
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import android.widget.FrameLayout;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.graphics.Rect;
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import android.graphics.RectF;
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import android.view.animation.Animation;
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import android.view.animation.TranslateAnimation;
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import android.widget.ImageView;
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import android.graphics.Color;
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import androidx.annotation.NonNull;
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import com.google.android.gms.vision.CameraSource;
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import com.google.android.gms.vision.Detector;
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import com.google.android.gms.vision.barcode.Barcode;
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import com.google.android.gms.vision.barcode.BarcodeDetector;
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import io.flutter.plugin.common.BinaryMessenger;
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import io.flutter.plugin.common.MethodCall;
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import io.flutter.plugin.common.MethodChannel;
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import io.flutter.plugin.platform.PlatformView;
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import java.io.IOException;
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import java.lang.reflect.Field;
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public class FlutterBarcodeView implements PlatformView{
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private static final String TAG = "FlutterBarcodeView";
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private final Context context;
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private final FrameLayout frameLayout;
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private final SurfaceView surfaceView;
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private final ScannerOverlay scannerOverlay;
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private final ImageView scanLine;
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private final MethodChannel methodChannel;
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private CameraSource cameraSource;
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private BarcodeDetector barcodeDetector;
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private boolean isDetecting = true;
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private boolean isFlashOn = false;
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private final Handler mainHandler;
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private final int SCAN_AREA_WIDTH = 800;
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private final int SCAN_AREA_HEIGHT = 800;
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public FlutterBarcodeView(Context context, BinaryMessenger messenger, int id) {
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this.context = context;
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this.mainHandler = new Handler(Looper.getMainLooper());
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// Create main container
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frameLayout = new FrameLayout(context);
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// Create and add surface view
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surfaceView = new SurfaceView(context);
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frameLayout.addView(surfaceView, new FrameLayout.LayoutParams(
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ViewGroup.LayoutParams.MATCH_PARENT,
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ViewGroup.LayoutParams.MATCH_PARENT));
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// Create and add scanner overlay
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scannerOverlay = new ScannerOverlay(context);
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frameLayout.addView(scannerOverlay, new FrameLayout.LayoutParams(
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ViewGroup.LayoutParams.MATCH_PARENT,
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ViewGroup.LayoutParams.MATCH_PARENT));
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// Create and add scan line
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scanLine = new ImageView(context);
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scanLine.setBackgroundColor(Color.RED);
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FrameLayout.LayoutParams scanLineParams = new FrameLayout.LayoutParams(
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SCAN_AREA_WIDTH - 40, // Slightly smaller than scan area
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5); // Line thickness
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frameLayout.addView(scanLine, scanLineParams);
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// Start scan line animation
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startScanLineAnimation();
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methodChannel = new MethodChannel(messenger, "plugins.codingwithtashi/barcode_scanner_view_" + id);
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methodChannel.setMethodCallHandler(this::onMethodCall);
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setupBarcodeDetector();
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setupCameraSource();
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setupSurfaceHolder();
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}
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private void startScanLineAnimation() {
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TranslateAnimation animation = new TranslateAnimation(
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Animation.RELATIVE_TO_PARENT, 0f,
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Animation.RELATIVE_TO_PARENT, 0f,
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Animation.RELATIVE_TO_PARENT, 0f,
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Animation.RELATIVE_TO_PARENT, 0.8f);
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animation.setDuration(3000);
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animation.setRepeatCount(Animation.INFINITE);
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animation.setRepeatMode(Animation.REVERSE);
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scanLine.startAnimation(animation);
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}
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private class ScannerOverlay extends View {
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private final Paint boxPaint;
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private final Paint transparentPaint;
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private final int boxCornerRadius = 20;
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public ScannerOverlay(Context context) {
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super(context);
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boxPaint = new Paint();
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boxPaint.setColor(Color.WHITE);
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boxPaint.setStyle(Paint.Style.STROKE);
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boxPaint.setStrokeWidth(5f);
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transparentPaint = new Paint();
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transparentPaint.setColor(Color.parseColor("#80000000")); // Semi-transparent black
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transparentPaint.setStyle(Paint.Style.FILL);
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}
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@Override
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protected void onDraw(Canvas canvas) {
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super.onDraw(canvas);
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int width = getWidth();
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int height = getHeight();
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// Calculate scanner box position (centered)
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int left = (width - SCAN_AREA_WIDTH) / 2;
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int top = (height - SCAN_AREA_HEIGHT) / 2;
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int right = left + SCAN_AREA_WIDTH;
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int bottom = top + SCAN_AREA_HEIGHT;
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// Draw transparent overlay
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canvas.drawRect(0, 0, width, top, transparentPaint); // Top
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canvas.drawRect(0, top, left, bottom, transparentPaint); // Left
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canvas.drawRect(right, top, width, bottom, transparentPaint); // Right
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canvas.drawRect(0, bottom, width, height, transparentPaint); // Bottom
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// Draw scanner box
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RectF boxRect = new RectF(left, top, right, bottom);
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canvas.drawRoundRect(boxRect, boxCornerRadius, boxCornerRadius, boxPaint);
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}
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}
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private void setupBarcodeDetector() {
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barcodeDetector = new BarcodeDetector.Builder(context)
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.setBarcodeFormats(Barcode.ALL_FORMATS)
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.build();
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barcodeDetector.setProcessor(new Detector.Processor<Barcode>() {
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private final Rect scanArea = new Rect();
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@Override
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public void release() {}
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@Override
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public void receiveDetections(@NonNull Detector.Detections<Barcode> detections) {
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if (!isDetecting) return;
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// Calculate scan area boundaries
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int width = surfaceView.getWidth();
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int height = surfaceView.getHeight();
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int left = (width - SCAN_AREA_WIDTH) / 2;
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int top = (height - SCAN_AREA_HEIGHT) / 2;
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scanArea.set(left, top, left + SCAN_AREA_WIDTH, top + SCAN_AREA_HEIGHT);
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final android.util.SparseArray<Barcode> barcodes = detections.getDetectedItems();
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if (barcodes.size() > 0) {
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final Barcode code = barcodes.valueAt(0);
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System.out.println("Barcode detected: " + code.rawValue);
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for (int i = 0; i < barcodes.size(); i++) {
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Barcode barcode = barcodes.valueAt(i);
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// Check if barcode is within scan area
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if (scanArea.contains(barcode.getBoundingBox())) {
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mainHandler.post(() -> {
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methodChannel.invokeMethod("onBarcodeDetected", barcode.rawValue);
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}
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);
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return;
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}
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}
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}
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}
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});
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}
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@Override
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public View getView() {
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return frameLayout;
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}
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private void setupCameraSource() {
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cameraSource = new CameraSource.Builder(context, barcodeDetector)
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.setAutoFocusEnabled(true)
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.setRequestedPreviewSize(1600, 1024)
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.build();
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}
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private void setupSurfaceHolder() {
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surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
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@Override
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public void surfaceCreated(SurfaceHolder holder) {
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try {
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cameraSource.start(surfaceView.getHolder());
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} catch (IOException e) {
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Log.e(TAG, "Error starting camera source: " + e.getMessage());
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methodChannel.invokeMethod("onError", "Failed to start camera: " + e.getMessage());
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} catch (SecurityException e) {
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Log.e(TAG, "Camera permission not granted: " + e.getMessage());
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methodChannel.invokeMethod("onError", "Camera permission not granted");
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}
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}
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@Override
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public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {}
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@Override
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public void surfaceDestroyed(SurfaceHolder holder) {
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cameraSource.stop();
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}
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});
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}
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private Camera getCamera() {
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try {
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Field[] declaredFields = CameraSource.class.getDeclaredFields();
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for (Field field : declaredFields) {
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if (field.getType() == Camera.class) {
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field.setAccessible(true);
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return (Camera) field.get(cameraSource);
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}
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}
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} catch (Exception e) {
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Log.e(TAG, "Error accessing camera: " + e.getMessage());
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}
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return null;
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}
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private void toggleFlash(MethodChannel.Result result) {
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try {
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Camera camera = getCamera();
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if (camera != null) {
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Camera.Parameters parameters = camera.getParameters();
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if (!isFlashOn) {
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parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
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isFlashOn = true;
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} else {
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parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
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isFlashOn = false;
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}
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camera.setParameters(parameters);
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result.success(isFlashOn);
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} else {
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result.error("CAMERA_ERROR", "Camera not available", null);
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}
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} catch (Exception e) {
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result.error("FLASH_ERROR", "Error toggling flash: " + e.getMessage(), null);
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}
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}
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private void onMethodCall(@NonNull MethodCall call, @NonNull MethodChannel.Result result) {
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switch (call.method) {
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case "pauseScanning":
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isDetecting = false;
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result.success(null);
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break;
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case "resumeScanning":
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isDetecting = true;
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result.success(null);
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break;
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case "toggleFlash":
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toggleFlash(result);
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break;
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default:
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result.notImplemented();
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}
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}
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@Override
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public void dispose() {
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if (cameraSource != null) {
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cameraSource.release();
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cameraSource = null;
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}
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if (barcodeDetector != null) {
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barcodeDetector.release();
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barcodeDetector = null;
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}
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scanLine.clearAnimation();
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}
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}

‎example/lib/main.dart‎

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Original file line numberDiff line numberDiff line change
@@ -29,6 +29,7 @@ class HomePage extends StatefulWidget {
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}
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class _HomePageState extends State<HomePage> {
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BarcodeViewController? controller;
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String result = '';
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@override
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Widget build(BuildContext context) {
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},
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child: const Text('Stream Barcode'),
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),
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SizedBox(
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height: 10,
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),
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SizedBox(
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width: 200,
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height: 200,
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child: SimpleBarcodeScanner(
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onScanned: (code) {
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setState(() {
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result = code;
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});
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},
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continuous: true,
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onBarcodeViewCreated: (BarcodeViewController controller) {
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this.controller = controller;
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},
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)),
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ElevatedButton(
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onPressed: () {
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controller?.toggleFlash();
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},
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child: Text("Switch"),
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),
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ElevatedButton(
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onPressed: () {
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controller?.pauseScanning();
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},
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child: Text("Pause"),
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),
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ElevatedButton(
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onPressed: () {
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controller?.resumeScanning();
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},
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child: Text("Resume"),
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),
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],
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),
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),

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