android - How to take picture with camera using ARCore

Android - How to take picture with camera using ARCore

To take a picture using the camera with ARCore in Android, you can integrate the ARCore library with the CameraX library for camera functionalities. Here's a step-by-step guide on how to achieve this:

Step 1: Set Up Dependencies

Ensure you have the necessary dependencies in your build.gradle file:

dependencies { implementation 'com.google.ar:core:1.28.0' // Replace with the latest version implementation 'androidx.camera:camera-camera2:1.1.0' implementation 'androidx.camera:camera-lifecycle:1.1.0' }

Step 2: Request Camera Permission

In your AndroidManifest.xml, include the necessary permissions:

<uses-permission android:name="android.permission.CAMERA" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Step 3: Set Up CameraX

Set up CameraX in your activity or fragment:

Kotlin Example (Fragment)

import android.Manifest import android.content.pm.PackageManager import android.os.Bundle import android.util.Log import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import android.widget.Toast import androidx.camera.core.Camera import androidx.camera.core.CameraSelector import androidx.camera.core.ImageCapture import androidx.camera.core.ImageCaptureException import androidx.camera.lifecycle.ProcessCameraProvider import androidx.core.app.ActivityCompat import androidx.core.content.ContextCompat import androidx.fragment.app.Fragment import androidx.lifecycle.LifecycleOwner import com.google.ar.core.Session import kotlinx.android.synthetic.main.fragment_camera.* import java.io.File import java.text.SimpleDateFormat import java.util.* class CameraFragment : Fragment() { private lateinit var imageCapture: ImageCapture private lateinit var session: Session override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { return inflater.inflate(R.layout.fragment_camera, container, false) } override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) if (allPermissionsGranted()) { startCamera() } else { ActivityCompat.requestPermissions( requireActivity(), REQUIRED_PERMISSIONS, REQUEST_CODE_PERMISSIONS ) } } private fun startCamera() { val cameraProviderFuture = ProcessCameraProvider.getInstance(requireContext()) cameraProviderFuture.addListener({ val cameraProvider = cameraProviderFuture.get() val preview = Preview.Builder() .build() .also { it.setSurfaceProvider(viewFinder.createSurfaceProvider()) } imageCapture = ImageCapture.Builder() .build() val cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA try { cameraProvider.unbindAll() cameraProvider.bindToLifecycle( this as LifecycleOwner, cameraSelector, preview, imageCapture ) } catch (exc: Exception) { Log.e(TAG, "Use case binding failed", exc) } }, ContextCompat.getMainExecutor(requireContext())) } private fun allPermissionsGranted() = REQUIRED_PERMISSIONS.all { ContextCompat.checkSelfPermission( requireContext(), it ) == PackageManager.PERMISSION_GRANTED } override fun onRequestPermissionsResult( requestCode: Int, permissions: Array<String>, grantResults: IntArray ) { if (requestCode == REQUEST_CODE_PERMISSIONS) { if (allPermissionsGranted()) { startCamera() } else { Toast.makeText( requireContext(), "Permissions not granted by the user.", Toast.LENGTH_SHORT ).show() requireActivity().finish() } } } companion object { private const val TAG = "CameraFragment" private const val REQUEST_CODE_PERMISSIONS = 10 private val REQUIRED_PERMISSIONS = arrayOf(Manifest.permission.CAMERA) } }

Step 4: Capture an Image

Use the following code snippet to capture an image with ImageCapture.

val file = File( outputDirectory, "IMG_${SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US).format(System.currentTimeMillis())}.jpg" ) val outputOptions = ImageCapture.OutputFileOptions.Builder(file).build() imageCapture.takePicture( outputOptions, ContextCompat.getMainExecutor(requireContext()), object : ImageCapture.OnImageSavedCallback { override fun onImageSaved(outputFileResults: ImageCapture.OutputFileResults) { val savedUri = Uri.fromFile(file) val msg = "Photo capture succeeded: $savedUri" Toast.makeText(context, msg, Toast.LENGTH_SHORT).show() Log.d(TAG, msg) } override fun onError(exception: ImageCaptureException) { Log.e(TAG, "Photo capture failed: ${exception.message}", exception) } })

Conclusion

This approach integrates ARCore with CameraX to enable capturing pictures using the device's camera within an ARCore session. Adjust the implementation based on your specific requirements and ensure to handle permissions and camera initialization properly in your application.

Examples

  1. How to integrate ARCore for camera functionality?

    • Description: Set up ARCore in your Android project by adding the necessary dependencies and permissions.
    • Code:
      // build.gradle (app module) dependencies { implementation 'com.google.ar:core:1.31.0' }

  2. How to create an AR session for capturing images?

    • Description: Initialize an ARSession to manage the AR experience and camera input.
    • Code:
      ARSession arSession = new ARSession(this); arSession.resume();

  3. How to request camera permissions in Android?

    • Description: Request camera permissions to ensure access to the device camera.
    • Code:
      if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA_PERMISSION); }

  4. How to use ARCore to capture a photo?

    • Description: Capture a photo using the camera feed from the AR session.
    • Code:
      Image image = arSession.update().getCamera().getImage(); // Process the image (e.g., save it)

  5. How to convert ARCore image to Bitmap?

    • Description: Convert the ARCore image to a Bitmap for display or saving.
    • Code:
      ByteBuffer buffer = image.getPlanes()[0].getBuffer(); byte[] bytes = new byte[buffer.remaining()]; buffer.get(bytes); Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);

  6. How to save a captured image in ARCore?

    • Description: Save the captured image to external storage.
    • Code:
      File file = new File(Environment.getExternalStorageDirectory(), "captured_image.jpg"); FileOutputStream fos = new FileOutputStream(file); bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos); fos.close();

  7. How to display the captured image in an ImageView?

    • Description: Show the captured image in an ImageView after processing.
    • Code:
      ImageView imageView = findViewById(R.id.imageView); imageView.setImageBitmap(bitmap);

  8. How to handle ARCore frame updates for capturing images?

    • Description: Use onDrawFrame() to update the ARCore session and capture frames.
    • Code:
      @Override public void onDrawFrame(GL10 gl) { arSession.update(); // Capture image logic here }

  9. How to ensure ARCore session is properly paused?

    • Description: Manage the AR session lifecycle to avoid memory leaks.
    • Code:
      @Override protected void onPause() { super.onPause(); arSession.pause(); }

  10. How to handle ARCore camera permissions result?

    • Description: Handle the result of the camera permission request.
    • Code:
      @Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { if (requestCode == REQUEST_CAMERA_PERMISSION) { if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { // Permission granted, start the AR session } else { // Permission denied, handle accordingly } } }

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