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Comment afficher l'aperçu de la caméra sur une SurfaceView?

J'essaie d'ouvrir le matériel de la caméra sur une SurfaceView. Dans la mise en page, j'ai créé une SurfaceView et j'ouvre la caméra comme indiqué dans le code ci-dessous. Lorsque j'exécute le code, le toast dans le CameraAvailableCB apparaît et dit "onCameraAvailable" mais rien n'apparaît sur le SurfaceView.

Comment afficher l'affichage de la caméra sur le SurfaceView?

Code

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    this.mBtnCapture = (Button) findViewById(R.id.actMain_btn_capture);
    this.mSurfaceView = (SurfaceView) findViewById(R.id.actMain_surfaceView);
    this.mSurfaceHolder = this.mSurfaceView.getHolder();
    this.mSurfaceHolder.addCallback(this);
    this.mCameraManager = (CameraManager) this.getSystemService(Context.CAMERA_SERVICE);

    try {
        cameraIDsList = this.mCameraManager.getCameraIdList();

        for (String id : cameraIDsList) {
            Log.v(TAG, "CameraID: " + id);
        }

    } catch (CameraAccessException e) {
        e.printStackTrace();
    }

    cameraStateCB = new CameraDevice.StateCallback() {
        @Override
        public void onOpened(CameraDevice camera) {
            Toast.makeText(getApplicationContext(), "onOpened", Toast.LENGTH_SHORT).show();

            //requesting permission
            int permissionCheck = ContextCompat.checkSelfPermission(activity, Manifest.permission.CAMERA);
            if (permissionCheck != PackageManager.PERMISSION_GRANTED) {

                if (ActivityCompat.shouldShowRequestPermissionRationale(activity, Manifest.permission.CAMERA)) {

                } else {
                    ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.CAMERA}, MY_PERMISSIONS_REQUEST_CAMERA);
                    Toast.makeText(getApplicationContext(), "request permission", Toast.LENGTH_SHORT).show();
                }

            } else {
                Toast.makeText(getApplicationContext(), "PERMISSION_ALREADY_GRANTED", Toast.LENGTH_SHORT).show();
            }

            //opening the camera
            try {
                mCameraManager.openCamera(cameraIDsList[1], cameraStateCB, new Handler());

            } catch (CameraAccessException e) {
                e.printStackTrace();
            }
        }

        @Override
        public void onDisconnected(CameraDevice camera) {
            Toast.makeText(getApplicationContext(), "onDisconnected", Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onError(CameraDevice camera, int error) {
            Toast.makeText(getApplicationContext(), "onError", Toast.LENGTH_SHORT).show();
        }
    };

    CameraManager.AvailabilityCallback cameraAvailableCB = new CameraManager.AvailabilityCallback() {
        @Override
        public void onCameraAvailable(String cameraId) {
            super.onCameraAvailable(cameraId);

            Toast.makeText(getApplicationContext(), "onCameraAvailable", Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onCameraUnavailable(String cameraId) {
            super.onCameraUnavailable(cameraId);

            Toast.makeText(getApplicationContext(), "onCameraUnavailable", Toast.LENGTH_SHORT).show();
        }
    };
    this.mCameraManager.registerAvailabilityCallback(cameraAvailableCB, new Handler());
}



@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    switch (requestCode) {
        case MY_PERMISSIONS_REQUEST_CAMERA:
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
                // Open Camera
                break;
    }
}

@Override
public void surfaceCreated(SurfaceHolder holder) {
    Log.w(TAG, "surfaceCreated");
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    Log.w(TAG, "surfaceChanged");
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
    Log.w(TAG, "surfaceDestroyed");
}
androidcameraandroid-camerasurfaceviewsurfaceholder
15
user2121

Pour afficher l'aperçu de la caméra à l'aide de l'API Camera2, vous devez procéder comme suit:

  1. Obtenir l'autorisation d'utiliser l'appareil photo
  2. Utilisation de la connexion ouverte de CameraManager à une caméra
  3. Préparer la surface pour l'aperçu
  4. En utilisant l'appareil photo ouvert et les surfaces souhaitées (cela peut inclure non seulement la surface d'aperçu), créez CaptureSession
  5. Une fois CaptureSession créé, vous devez créer et configurer CaptureRequest et le soumettre à CaptureSession

Vous devez noter que la préparation des surfaces et l'ouverture de la connexion à la caméra sont des processus indépendants, vous devez donc être sûr qu'ils sont tous les deux terminés avant de créer CaptureSession.

Voici l'exemple d'activité pour afficher l'aperçu de la caméra à l'écran:

public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback, Handler.Callback {
    static final String TAG = "CamTest";
    static final int MY_PERMISSIONS_REQUEST_CAMERA = 1242;
    private static final int MSG_CAMERA_OPENED = 1;
    private static final int MSG_SURFACE_READY = 2;
    private final Handler mHandler = new Handler(this);
    SurfaceView mSurfaceView;
    SurfaceHolder mSurfaceHolder;
    CameraManager mCameraManager;
    String[] mCameraIDsList;
    CameraDevice.StateCallback mCameraStateCB;
    CameraDevice mCameraDevice;
    CameraCaptureSession mCaptureSession;
    boolean mSurfaceCreated = true;
    boolean mIsCameraConfigured = false;
    private Surface mCameraSurface = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        this.mSurfaceView = (SurfaceView) findViewById(R.id.SurfaceViewPreview);
        this.mSurfaceHolder = this.mSurfaceView.getHolder();
        this.mSurfaceHolder.addCallback(this);
        this.mCameraManager = (CameraManager) this.getSystemService(Context.CAMERA_SERVICE);

        try {
            mCameraIDsList = this.mCameraManager.getCameraIdList();
            for (String id : mCameraIDsList) {
                Log.v(TAG, "CameraID: " + id);
            }
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }

        mCameraStateCB = new CameraDevice.StateCallback() {
            @Override
            public void onOpened(CameraDevice camera) {
                Toast.makeText(getApplicationContext(), "onOpened", Toast.LENGTH_SHORT).show();

                mCameraDevice = camera;
                mHandler.sendEmptyMessage(MSG_CAMERA_OPENED);
            }

            @Override
            public void onDisconnected(CameraDevice camera) {
                Toast.makeText(getApplicationContext(), "onDisconnected", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onError(CameraDevice camera, int error) {
                Toast.makeText(getApplicationContext(), "onError", Toast.LENGTH_SHORT).show();
            }
        };
    }

    @Override
    protected void onStart() {
        super.onStart();

        //requesting permission
        int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA);
        if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
            if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA)) {

            } else {
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, MY_PERMISSIONS_REQUEST_CAMERA);
                Toast.makeText(getApplicationContext(), "request permission", Toast.LENGTH_SHORT).show();
            }
        } else {
            Toast.makeText(getApplicationContext(), "PERMISSION_ALREADY_GRANTED", Toast.LENGTH_SHORT).show();
            try {
                mCameraManager.openCamera(mCameraIDsList[1], mCameraStateCB, new Handler());
            } catch (CameraAccessException e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    protected void onStop() {
        super.onStop();
        try {
            if (mCaptureSession != null) {
                mCaptureSession.stopRepeating();
                mCaptureSession.close();
                mCaptureSession = null;
            }

            mIsCameraConfigured = false;
        } catch (final CameraAccessException e) {
            // Doesn't matter, cloising device anyway
            e.printStackTrace();
        } catch (final IllegalStateException e2) {
            // Doesn't matter, cloising device anyway
            e2.printStackTrace();
        } finally {
            if (mCameraDevice != null) {
                mCameraDevice.close();
                mCameraDevice = null;
                mCaptureSession = null;
            }
        }
    }

    @Override
    public boolean handleMessage(Message msg) {
        switch (msg.what) {
            case MSG_CAMERA_OPENED:
            case MSG_SURFACE_READY:
                // if both surface is created and camera device is opened
                // - ready to set up preview and other things
                if (mSurfaceCreated && (mCameraDevice != null)
                        && !mIsCameraConfigured) {
                    configureCamera();
                }
                break;
        }

        return true;
    }

    private void configureCamera() {
        // prepare list of surfaces to be used in capture requests
        List<Surface> sfl = new ArrayList<Surface>();

        sfl.add(mCameraSurface); // surface for viewfinder preview

        // configure camera with all the surfaces to be ever used
        try {
            mCameraDevice.createCaptureSession(sfl,
                    new CaptureSessionListener(), null);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }

        mIsCameraConfigured = true;
    }


    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        switch (requestCode) {
            case MY_PERMISSIONS_REQUEST_CAMERA:
                if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED)
                    try {
                        mCameraManager.openCamera(mCameraIDsList[1], mCameraStateCB, new Handler());
                    } catch (CameraAccessException e) {
                        e.printStackTrace();
                    }
                break;
        }
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        mCameraSurface = holder.getSurface();
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        mCameraSurface = holder.getSurface();
        mSurfaceCreated = true;
        mHandler.sendEmptyMessage(MSG_SURFACE_READY);
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        mSurfaceCreated = false;
    }

    private class CaptureSessionListener extends
            CameraCaptureSession.StateCallback {
        @Override
        public void onConfigureFailed(final CameraCaptureSession session) {
            Log.d(TAG, "CaptureSessionConfigure failed");
        }

        @Override
        public void onConfigured(final CameraCaptureSession session) {
            Log.d(TAG, "CaptureSessionConfigure onConfigured");
            mCaptureSession = session;

            try {
                CaptureRequest.Builder previewRequestBuilder = mCameraDevice
                        .createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
                previewRequestBuilder.addTarget(mCameraSurface);
                mCaptureSession.setRepeatingRequest(previewRequestBuilder.build(),
                        null, null);
            } catch (CameraAccessException e) {
                Log.d(TAG, "setting up preview failed");
                e.printStackTrace();
            }
        }
    }
}
33
Maxim Metelskiy