Fix blurry camera during QR scanning on multi-camera devices

src/main/java/org/thoughtcrime/securesms/qr/QrScanFragment.java

@@ -13,6 +13,7 @@
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
 
+import com.journeyapps.barcodescanner.camera.CameraSettings;
 import com.journeyapps.barcodescanner.CaptureManager;
 import com.journeyapps.barcodescanner.CompoundBarcodeView;
 import com.journeyapps.barcodescanner.DecoratedBarcodeView;
@@ -90,6 +91,12 @@ void handleQrScanWithPermissions(Activity activity) {
 
     private void init(CompoundBarcodeView barcodeScannerView, Activity activity, Bundle savedInstanceState) {
         try {
+            // Configure camera to use continuous autofocus mode which works better
+            // on devices with multiple cameras
+            CameraSettings settings = barcodeScannerView.getBarcodeView().getCameraSettings();
+            settings.setFocusMode(CameraSettings.FocusMode.CONTINUOUS);
+            barcodeScannerView.getBarcodeView().setCameraSettings(settings);
+
             capture = new MyCaptureManager(activity, barcodeScannerView);
             capture.initializeFromIntent(activity.getIntent(), savedInstanceState);
             capture.decode();

src/main/java/org/thoughtcrime/securesms/qr/RegistrationQrActivity.java

@@ -11,6 +11,7 @@
 
 import androidx.annotation.NonNull;
 
+import com.journeyapps.barcodescanner.camera.CameraSettings;
 import com.journeyapps.barcodescanner.CaptureManager;
 import com.journeyapps.barcodescanner.CompoundBarcodeView;
 
@@ -105,6 +106,12 @@ public void onRequestPermissionsResult(int requestCode, @NonNull String permissi
     }
 
     private void init(CompoundBarcodeView barcodeScannerView, Intent intent, Bundle savedInstanceState) {
+        // Configure camera to use continuous autofocus mode which works better
+        // on devices with multiple cameras
+        CameraSettings settings = barcodeScannerView.getBarcodeView().getCameraSettings();
+        settings.setFocusMode(CameraSettings.FocusMode.CONTINUOUS);
+        barcodeScannerView.getBarcodeView().setCameraSettings(settings);
+
         capture = new CaptureManager(this, barcodeScannerView);
         capture.initializeFromIntent(intent, savedInstanceState);
         capture.decode();