Taking Picture while using Camera in PreviewView

Question

I'm having trouble taking a photo of the current camera image. The camera image is displayed in the view and when a button is pressed, the photo should be saved or processed later on.

I'm working with the CameraX API and Android 12 (API level 31).

import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import androidx.camera.core.Camera;
import androidx.camera.core.CameraSelector;
import androidx.camera.core.ImageCapture;
import androidx.camera.core.ImageCaptureException;
import androidx.camera.core.Preview;
import androidx.camera.lifecycle.ProcessCameraProvider;
import androidx.camera.view.PreviewView;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import com.google.common.util.concurrent.ListenableFuture;
import java.io.File;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
public class MainActivity extends AppCompatActivity {
 private PreviewView viewFinder;
 private ProcessCameraProvider cameraProvider;
 private Camera camera;
 private ImageCapture imageCapture;
 private static final int CAMERA_PERMISSION_CODE = 1;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 viewFinder = findViewById(R.id.viewFinder);
 startCamera();
 Button takePictureButton = findViewById(R.id.takePictureButton);
 takePictureButton.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 takePicture();
 }
 });
 }
 private void startCamera() {
 if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
 // Berechtigung wurde erteilt, öffnen Sie die Kamera.
 } else {
 // Fordern Sie die Berechtigung an.
 ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, CAMERA_PERMISSION_CODE);
 }
 ListenableFuture<ProcessCameraProvider> cameraProviderFuture = ProcessCameraProvider.getInstance(this);
 cameraProviderFuture.addListener(() -> {
 try {
 // Verfügbare Kamera-Provider abrufen
 cameraProvider = cameraProviderFuture.get();
 // Kamera-Vorschau konfigurieren und starten
 bindPreview();
 } catch (ExecutionException | InterruptedException e) {
 // handle error
 }
 }, ContextCompat.getMainExecutor(this));
 }
 private void bindPreview() {
 imageCapture =
 new ImageCapture.Builder()
 .setTargetRotation(viewFinder.getDisplay().getRotation())
 .build();
 Preview preview = new Preview.Builder().build();
 preview.setSurfaceProvider(viewFinder.getSurfaceProvider());
 // 
 CameraSelector cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA;
 // bind
 camera = cameraProvider.bindToLifecycle(this, cameraSelector, preview, imageCapture);
 }
 private void takePicture() {
 Executor cameraExecutor = ContextCompat.getMainExecutor(this);
 ImageCapture.OutputFileOptions outputFileOptions =
 new ImageCapture.OutputFileOptions.Builder(new File(getExternalMediaDirs()[0], "photo.jpg")).build();
 imageCapture.takePicture(outputFileOptions, cameraExecutor,
 new ImageCapture.OnImageSavedCallback() {
 @Override
 public void onImageSaved(ImageCapture.OutputFileResults outputFileResults) {
 System.out.println("SAVED");
 Toast.makeText(MainActivity.this, "Photo saved", Toast.LENGTH_SHORT).show();
 }
 @Override
 public void onError(ImageCaptureException error) {
 System.out.println("not saved");
 Toast.makeText(MainActivity.this, "Error saving photo", Toast.LENGTH_SHORT).show();
 System.out.println(error);
 }
 }
 );
 }
}

I am getting the following error, and the camera image freezes and restarts again.

/ImageCapture: Send image capture request [current, pending] = [0, 1]
D/ImageCapture: issueTakePicture
D/Camera2CameraImpl: {Camera@bcf4c18[id=0]} Issue capture request
D/CaptureSession: Issuing capture request.
D/EGL_emulation: app_time_stats: avg=20.36ms min=1.77ms max=477.02ms count=39
E/CameraCaptureSession: Session 0: Exception while stopping repeating: 
 android.hardware.camera2.CameraAccessException: CAMERA_ERROR (3): cancelRequest:507: Camera 0: Error clearing streaming request: Function not implemented (-38)
 at android.hardware.camera2.CameraManager.throwAsPublicException(CameraManager.java:1179)
...

I am getting the following error, and the camera image freezes and restarts again.

• Xi 张熹: Could you switch to the latest version 1.3.0-alpha03 and try again?
• Daniel: I use API31 of android, so i cannot use latest version. I changed the code now to ImageAnalyse because i wanted to implement a BarcodeScanner