Allow choosing front or back camera

android/src/main/java/com/dutchconcepts/capacitor/barcodescanner/BarcodeScanner.java

@@ -8,6 +8,7 @@
 import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.graphics.Color;
+//import android.graphics.Camera;
 import android.hardware.Camera;
 import android.net.Uri;
 import android.os.Build;
@@ -48,7 +49,7 @@ public class BarcodeScanner extends Plugin implements BarcodeCallback {
 
     private BarcodeView mBarcodeView;
 
-    private int currentCameraId = Camera.CameraInfo.CAMERA_FACING_BACK;
+    //private int currentCameraId = Camera.CameraInfo.CAMERA_FACING_BACK;
 
     private boolean isScanning = false;
     private boolean shouldRunScan = false;
@@ -93,7 +94,7 @@ private boolean hasCamera() {
         }
     }
 
-    private void setupCamera() {
+    private void setupCamera(String cameraDirection) {
         // @TODO(): add support for switching cameras
         // @TODO(): add support for toggling torch
 
@@ -105,7 +106,9 @@ private void setupCamera() {
 
                     // Configure the camera (front/back)
                     CameraSettings settings = new CameraSettings();
-                    settings.setRequestedCameraId(currentCameraId);
+                    settings.setRequestedCameraId(
+                        "front".equals(cameraDirection) ? Camera.CameraInfo.CAMERA_FACING_FRONT : Camera.CameraInfo.CAMERA_FACING_BACK
+                    );
                     settings.setContinuousFocusEnabled(true);
                     mBarcodeView.setCameraSettings(settings);
 
@@ -153,13 +156,13 @@ private void dismantleCamera() {
         }
     }
 
-    private void prepare() {
+    private void _prepare(PluginCall call) {
         // undo previous setup
         // because it may be prepared with a different config
         dismantleCamera();
 
         // setup camera with new config
-        setupCamera();
+        setupCamera(call.getString("cameraDirection", "back"));
 
         // indicate this method was run
         didRunCameraPrepare = true;
@@ -225,7 +228,7 @@ private void scan() {
                     Log.d("scanner", "No permission to use camera. Did you request it yet?");
                 } else {
                     shouldRunScan = true;
-                    prepare();
+                    _prepare(getSavedCall());
                 }
             }
         } else {
@@ -310,7 +313,7 @@ public void possibleResultPoints(List<ResultPoint> resultPoints) {}
 
     @PluginMethod
     public void prepare(PluginCall call) {
-        prepare();
+        _prepare(call);
         call.resolve();
     }
 
@@ -476,7 +479,7 @@ public void checkPermission(PluginCall call) {
             _checkPermission(call, true);
         } else {
             _checkPermission(call, false);
-        }   
+        }
     }
 
     @PluginMethod

ios/Plugin/Plugin.swift

@@ -55,7 +55,6 @@ public class BarcodeScanner: CAPPlugin, AVCaptureMetadataOutputObjectsDelegate {
     var captureVideoPreviewLayer:AVCaptureVideoPreviewLayer?
     var metaOutput: AVCaptureMetadataOutput?
 
-    var currentCamera: Int = 0;
     var frontCamera: AVCaptureDevice?
     var backCamera: AVCaptureDevice?
 
@@ -134,8 +133,9 @@ public class BarcodeScanner: CAPPlugin, AVCaptureMetadataOutputObjectsDelegate {
         return false;
     }
 
-    private func setupCamera() -> Bool {
+    private func setupCamera(cameraDirection: String? = "back") -> Bool {
         do {
+            var cameraDir = cameraDirection
             cameraView.backgroundColor = UIColor.clear
             self.webView!.superview!.insertSubview(cameraView, belowSubview: self.webView!)
 
@@ -149,11 +149,17 @@ public class BarcodeScanner: CAPPlugin, AVCaptureMetadataOutputObjectsDelegate {
                 }
             }
             // older iPods have no back camera
-            if(backCamera == nil){
-                currentCamera = 1
+            if (cameraDir == "back") {
+                if (backCamera == nil) {
+                    cameraDir = "front"
+                }
+            } else {
+                if (frontCamera == nil) {
+                    cameraDir = "back"
+                }
             }
             let input: AVCaptureDeviceInput
-            input = try self.createCaptureDeviceInput()
+            input = try self.createCaptureDeviceInput(cameraDirection: cameraDir)
             captureSession = AVCaptureSession()
             captureSession!.addInput(input)
             metaOutput = AVCaptureMetadataOutput()
@@ -178,15 +184,15 @@ public class BarcodeScanner: CAPPlugin, AVCaptureMetadataOutputObjectsDelegate {
     @available(swift, deprecated: 5.6, message: "New Xcode? Check if `AVCaptureDevice.DeviceType` has new types and add them accordingly.")
     private func discoverCaptureDevices() -> [AVCaptureDevice] {
         if #available(iOS 13.0, *) {
-            return AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInTripleCamera, .builtInDualCamera, .builtInDualWideCamera, .builtInWideAngleCamera, .builtInUltraWideCamera, .builtInTelephotoCamera, .builtInTrueDepthCamera], mediaType: .video, position: .front).devices
+            return AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInTripleCamera, .builtInDualCamera, .builtInTelephotoCamera, .builtInTrueDepthCamera, .builtInUltraWideCamera, .builtInDualWideCamera, .builtInWideAngleCamera], mediaType: .video, position: .unspecified).devices
         } else {
-            return AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInDualCamera, .builtInWideAngleCamera, .builtInTelephotoCamera, .builtInTrueDepthCamera], mediaType: .video, position: .front).devices
+            return AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInDualCamera, .builtInWideAngleCamera, .builtInTelephotoCamera, .builtInTrueDepthCamera], mediaType: .video, position: .unspecified).devices
         }
     }
 
-    private func createCaptureDeviceInput() throws -> AVCaptureDeviceInput {
+    private func createCaptureDeviceInput(cameraDirection: String? = "back") throws -> AVCaptureDeviceInput {
         var captureDevice: AVCaptureDevice
-        if(currentCamera == 0){
+        if(cameraDirection == "back"){
             if(backCamera != nil){
                 captureDevice = backCamera!
             } else {
@@ -218,7 +224,7 @@ public class BarcodeScanner: CAPPlugin, AVCaptureMetadataOutputObjectsDelegate {
                 self.captureVideoPreviewLayer = nil
                 self.metaOutput = nil
                 self.captureSession = nil
-                self.currentCamera = 0
+//                self.currentCamera = 0
                 self.frontCamera = nil
                 self.backCamera = nil
             }
@@ -234,14 +240,14 @@ public class BarcodeScanner: CAPPlugin, AVCaptureMetadataOutputObjectsDelegate {
         }
     }
 
-    private func prepare() {
+    private func prepare(_ call: CAPPluginCall? = nil) {
         // undo previous setup
         // because it may be prepared with a different config
         self.dismantleCamera()
 
         DispatchQueue.main.async {
             // setup camera with new config
-            if (self.setupCamera()) {
+            if (self.setupCamera(cameraDirection: call?.getString("cameraDirection") ?? "back")) {
                 // indicate this method was run
                 self.didRunCameraPrepare = true
 
@@ -267,7 +273,7 @@ public class BarcodeScanner: CAPPlugin, AVCaptureMetadataOutputObjectsDelegate {
                 // requestPermission()
             } else {
                 self.shouldRunScan = true
-                self.prepare()
+                self.prepare(savedCall)
             }
         } else {
             self.didRunCameraPrepare = false
@@ -363,7 +369,7 @@ public class BarcodeScanner: CAPPlugin, AVCaptureMetadataOutputObjectsDelegate {
     }
 
     @objc func prepare(_ call: CAPPluginCall) {
-        self.prepare()
+        self.prepare(call)
         call.resolve()
     }
 

src/definitions.ts

@@ -1,5 +1,5 @@
 export interface BarcodeScannerPlugin {
-  prepare(): Promise<void>;
+  prepare(options?: ScanOptions): Promise<void>;
   hideBackground(): Promise<void>;
   showBackground(): Promise<void>;
   startScan(options?: ScanOptions): Promise<ScanResult>;
@@ -80,6 +80,10 @@ export enum SupportedFormat {
   // END 2D
 }
 
+export enum CameraDirection {
+  FRONT = 'front',
+  BACK = 'back',
+}
 export interface ScanOptions {
   /**
    * This parameter can be used to make the scanner only recognize specific types of barcodes.
@@ -88,6 +92,7 @@ export interface ScanOptions {
    * @since 1.2.0
    */
   targetedFormats?: SupportedFormat[];
+  cameraDirection?: CameraDirection;
 }
 
 export interface StopScanOptions {