Camera and barcode

Capture a photo — Camera.shot()

Camera cam = new Camera();
cam.cameraType = Camera.CameraType.PICKER;      // ⚠️ no default — always set it
cam.captureMode = Camera.Preview.PHOTO;

new Thread(() -> {
   String caminho = cam.shot();                 // file path, or null if cancelled
   if (caminho == null) return;
   Component.onUI(() -> {
      try { imageView.image(new Image(caminho)); Component.repaint(); }
      catch (Exception e) { Debug.log("erro: " + e); }
   });
}).start();

⚠️ click() no longer exists — the capture method is shot() (it returns a String with the path or null if the user cancels).

Configuration

Read a barcode — CameraBarcode.readBarcode(Image)

Reads 1D and 2D (QR) from an already-captured image (via ZXing):

Image img = new Image(caminho);
com.google.zxing.Result r = CameraBarcode.readBarcode(img);   // null if no code was found
if (r != null) {
   String codigo = r.getText();
   Debug.log("Código: " + codigo);
}

Real limitations

• Camera.shot() opens native UI — call it off the paint thread and return with onUI(...).
• CameraBarcode.readBarcode is NOT thread-safe — do not call it from several threads at once.
• null returns are normal (cancelled / no code found) — always check.
• On Mac ARM the capture may return null (platform limitation).

Best practices

• Always set cameraType (there is no default).
• Handle the null return from shot() and from readBarcode(...).
• To only pick from the gallery, use the PhotoPicker.

Common mistakes

• Calling click() (doesn’t exist) instead of shot().
• Not setting cameraType.
• Calling readBarcode concurrently (it is not thread-safe).

See also

• PhotoPicker · Images · Per-platform permissions