#627 IOS QR code scanner now handles permissions

core/src/cz/nic/tablexia/util/ui/QRCodeScanner.java

@@ -28,38 +28,38 @@ public abstract class QRCodeScanner {
     public interface QRCodeListener {
         void onCodeScanned(String data);
     }
-
-    private QRCodeListener listener;
-    private boolean scanningEnabled = false;
-    private boolean cameraPreviewActive = false;
-
+    
+    private   QRCodeListener listener;
+    private   boolean scanningEnabled = false;
+    protected boolean cameraPreviewActive = false;
+    
     public void enableScanning() {
         scanningEnabled = true;
     }
-
+    
     public void disableScanning() {
         scanningEnabled = false;
     }
-
+    
     public boolean isScanningEnabled() {
         return scanningEnabled;
     }
-
+    
     public boolean isCameraPreviewActive() {
         return cameraPreviewActive;
     }
-
+    
     public void setQRCodeListener(QRCodeListener listener) {
         this.listener = listener;
     }
-
+    
     public void removeQRCodeListener() {
         this.listener = null;
     }
-
+    
     public synchronized void onCodeScanned(final String data) {
         if(!isScanningEnabled()) return;
-
+        
         if(listener != null) {
             Gdx.app.postRunnable(new Runnable() {
                 @Override
@@ -67,34 +67,34 @@ public abstract class QRCodeScanner {
             });
         }
     }
-
+    
     public void startCameraPreview() {
         if(isCameraPreviewActive()) {
             Log.info(getClass(), "Camera preview is already active. Cannot start it again!");
             return;
         }
-
+        
         Log.info(getClass(), "Starting Camera Preview!");
-
+        
         cameraPreviewActive = true;
         onCameraPreviewStarted();
     }
-
+    
     public void stopCameraPreview() {
         if(!isCameraPreviewActive()) {
             Log.info(getClass(), "Camera preview is not running. Cannot stop it!");
             return;
         }
-
+        
         Log.info(getClass(), "Stopping Camera Preview");
-
+        
         onCameraPreviewStopped();
         cameraPreviewActive = false;
     }
-
+    
     /* ABSTRACT METHODS */
     public abstract boolean isCameraAccessible();
-
+    
     public abstract void onCameraPreviewStarted();
     public abstract void onCameraPreviewStopped();
 }

ios/src/cz/nic/tablexia/IOSQRCodeScanner.java

@@ -20,6 +20,7 @@ package cz.nic.tablexia;
 import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.backends.iosrobovm.IOSApplication;
 
+import org.robovm.apple.avfoundation.AVAuthorizationStatus;
 import org.robovm.apple.avfoundation.AVCaptureConnection;
 import org.robovm.apple.avfoundation.AVCaptureDevice;
 import org.robovm.apple.avfoundation.AVCaptureDeviceInput;
@@ -38,27 +39,30 @@ import org.robovm.apple.dispatch.DispatchQueue;
 import org.robovm.apple.dispatch.DispatchQueueAttr;
 import org.robovm.apple.foundation.NSArray;
 import org.robovm.apple.foundation.NSErrorException;
+import org.robovm.apple.foundation.NSString;
 import org.robovm.apple.uikit.UIApplication;
 import org.robovm.apple.uikit.UIInterfaceOrientation;
 import org.robovm.apple.uikit.UIView;
 import org.robovm.apple.uikit.UIViewController;
+import org.robovm.objc.block.VoidBooleanBlock;
 
 import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicBoolean;
 
 import cz.nic.tablexia.util.Log;
 import cz.nic.tablexia.util.ui.QRCodeScanner;
 
 public class IOSQRCodeScanner extends QRCodeScanner {
-
+    
     private static final String DISPATCH_QUEUE_NAME = "qrCodeQueue";
-
+    
     private class CaptureMetadataOutputDelegate extends AVCaptureMetadataOutputObjectsDelegateAdapter{
         private IOSQRCodeScanner qrCodeScanner;
-
+        
         public CaptureMetadataOutputDelegate() {
             this.qrCodeScanner = IOSQRCodeScanner.this;
         }
-
+        
         @Override
         public void didOutputMetadataObjects(AVCaptureOutput captureOutput, NSArray<AVMetadataObject> metadataObjects, AVCaptureConnection connection) {
             if(metadataObjects != null && metadataObjects.size() > 0) {
@@ -67,46 +71,84 @@ public class IOSQRCodeScanner extends QRCodeScanner {
                     //Found QR Code TODO - change data.toString()
                     qrCodeScanner.onCodeScanned(data.toString());
                 }
-
+                
                 metadataObjects.dispose();
             }
         }
     }
-
+    
     private AVCaptureDevice cameraDevice;
-
+    
     private AVCaptureSession captureSession;
     private AVCaptureDeviceInput captureDeviceInput;
     private AVCaptureMetadataOutput captureMetadataOutput;
-
+    
     private CaptureMetadataOutputDelegate captureDelegate;
-
+    
     private UIViewController cameraPreviewViewController;
     private UIView cameraPreviewView;
     private AVCaptureVideoPreviewLayer videoPreviewLayer;
-
+    
     private DispatchQueue dispatchQueue;
-
+    
+    private AtomicBoolean hasPermissions = new AtomicBoolean(false);
+    private AtomicBoolean startRequested = new AtomicBoolean(false);
+    
     private void initializeCameraDevice() {
         if(cameraDevice != null) return;
-
+        
         NSArray<AVCaptureDevice> captureDevices = AVCaptureDevice.getDevicesForMediaType(AVMediaType.Video);
-
+        
         for(AVCaptureDevice captureDevice : captureDevices) {
             if(captureDevice.getPosition() == AVCaptureDevicePosition.Back) {
                 //We found back camera!
                 cameraDevice = captureDevice;
-                return;
+                break;
             }
         }
     }
-
+    
+    private void setupPermissionsToUseCamera() {
+        if(cameraDevice == null) {
+            hasPermissions.set(false);
+            return;
+        }
+        
+        AVAuthorizationStatus status = cameraDevice.getAuthorizationStatusForMediaType(AVMediaType.Video);
+        
+        Log.info(getClass(), "Authorization status for video media type: " + status.name());
+        
+        switch (status) {
+            case Authorized:
+                hasPermissions.set(true);
+                break;
+                
+            case NotDetermined:
+                cameraDevice.requestAccessForMediaType(AVMediaType.Video, new VoidBooleanBlock() {
+                    @Override
+                    public void invoke(boolean b) {
+                        hasPermissions.set(b);
+                        if(hasPermissions.get() && startRequested.get() && !isCameraPreviewActive()) {
+                            Log.info(getClass(), "Starting camera preview again!");
+                            startCameraPreview();
+                        }
+                    }
+                });
+                break;
+                
+            case Restricted:
+            case Denied:
+                hasPermissions.set(false);
+                return;
+        }
+    }
+    
     @Override
     public boolean isCameraAccessible() {
         initializeCameraDevice();
         return cameraDevice != null;
     }
-
+    
     private AVCaptureVideoOrientation getOrientationForCameraPreviewLayer() {
         switch (UIApplication.getSharedApplication().getStatusBarOrientation()) {
             case LandscapeLeft: return AVCaptureVideoOrientation.LandscapeLeft;
@@ -116,43 +158,56 @@ public class IOSQRCodeScanner extends QRCodeScanner {
             default: return AVCaptureVideoOrientation.LandscapeLeft;
         }
     }
-
+    
     private void updateViewPreviewLayerOrientation() {
         if(videoPreviewLayer != null ) videoPreviewLayer.getConnection().setVideoOrientation(getOrientationForCameraPreviewLayer());
     }
-
+    
     @Override
     public void onCameraPreviewStarted() {
         captureSession = new AVCaptureSession();
-
+        
         initializeCameraDevice();
-
+        
+        setupPermissionsToUseCamera();
+        if(!hasPermissions.get()) {
+            cameraPreviewActive = false;
+            startRequested.set(true);
+            captureSession.dispose();
+            captureSession = null;
+            return;
+        }
+        
         //INPUT DEVICE//
         try {
             captureDeviceInput = new AVCaptureDeviceInput(cameraDevice);
             if(captureSession.canAddInput(captureDeviceInput)) captureSession.addInput(captureDeviceInput);
         } catch (NSErrorException e) {
             Log.err(getClass(), "Cannot start camera preview!", e);
+            
+            if(captureDeviceInput != null) captureDeviceInput.dispose();
+            captureSession.dispose();
+            return;
         }
-
+        
         dispatchQueue = DispatchQueue.create(DISPATCH_QUEUE_NAME, DispatchQueueAttr.Serial());
-
+        
         captureMetadataOutput = new AVCaptureMetadataOutput();
         captureDelegate = new CaptureMetadataOutputDelegate();
         captureMetadataOutput.setMetadataObjectsDelegate(captureDelegate, dispatchQueue);
-
+        
         if(captureSession.canAddOutput(captureMetadataOutput)) captureSession.addOutput(captureMetadataOutput);
         captureMetadataOutput.setMetadataObjectTypes(Arrays.asList(AVMetadataObjectType.QRCode));
-
+        
         IOSApplication iosApplication = (IOSApplication) Gdx.app;
-
+        
         cameraPreviewViewController = new UIViewController() {
             @Override
             public void viewWillLayoutSubviews() {
                 super.viewWillLayoutSubviews();
                 updateViewPreviewLayerOrientation();
             }
-
+            
             @Override
             public void willAnimateRotation(UIInterfaceOrientation uiInterfaceOrientation, double v) {
                 //Unforunately this method is deprecated and there isnt binding in RoboVM for these replacements...
@@ -162,57 +217,57 @@ public class IOSQRCodeScanner extends QRCodeScanner {
                 updateViewPreviewLayerOrientation();
             }
         };
-
+        
         cameraPreviewView = new UIView();
         cameraPreviewView.setBounds(iosApplication.getUIViewController().getView().getBounds());
         cameraPreviewView.setCenter(iosApplication.getUIViewController().getView().getCenter());
-
+        
         cameraPreviewViewController.setView(cameraPreviewView);
-
+        
         videoPreviewLayer = new AVCaptureVideoPreviewLayer(captureSession);
         videoPreviewLayer.setVideoGravity(AVLayerVideoGravity.ResizeAspectFill);
         videoPreviewLayer.getConnection().setVideoOrientation(getOrientationForCameraPreviewLayer());
         videoPreviewLayer.setFrame(cameraPreviewView.getBounds());
-
+        
         cameraPreviewView.getLayer().addSublayer(videoPreviewLayer);
-
+        
         iosApplication.getUIViewController().addChildViewController(cameraPreviewViewController);
         iosApplication.getUIViewController().getView().addSubview(cameraPreviewView);
-
+        
         if(!captureSession.isRunning()) captureSession.startRunning();
     }
-
+    
     @Override
     public void onCameraPreviewStopped() {
         captureSession.stopRunning();
-
+        
         captureSession.removeInput(captureDeviceInput);
         captureSession.removeOutput(captureMetadataOutput);
-
+        
         captureDeviceInput.dispose();
         captureDeviceInput = null;
-
+        
         captureMetadataOutput.dispose();
         captureMetadataOutput = null;
-
+        
         captureDelegate.dispose();
         captureDelegate = null;
-
+        
         videoPreviewLayer.removeFromSuperlayer();
         videoPreviewLayer.dispose();
         videoPreviewLayer = null;
-
+        
         cameraPreviewViewController.removeFromParentViewController();
         cameraPreviewViewController.dispose();
         cameraPreviewViewController = null;
-
+        
         cameraPreviewView.removeFromSuperview();
         cameraPreviewView.dispose();
         cameraPreviewView = null;
-
+        
         captureSession.dispose();
         captureSession = null;
-
+        
         dispatchQueue = null;
     }
-}
+}
\ No newline at end of file

[Drahomír Karchňák]

Oops, moje chyba. Je to issue: https://gitlab.labs.nic.cz/labs/tablexia/issues/624.