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  3. android.hardware.camera2.CameraAccessException

Java 类android.hardware.camera2.CameraAccessException 实例源码

项目：LongImageCamera    文件：Camera2.java    
@Override
void setFlash(int flash) {
    if (mFlash == flash) {
        return;
    }
    int saved = mFlash;
    mFlash = flash;
    if (mPreviewRequestBuilder != null) {
        updateFlash();
        if (mCaptureSession != null) {
            try {
                mCaptureSession.setRepeatingRequest(mPreviewRequestBuilder.build(),
                        mCaptureCallback, null);
            } catch (CameraAccessException e) {
                mFlash = saved; // Revert
            }
        }
    }
}
项目：CameraKitView    文件：Camera2Fragment.java    
void setManualFocusAt(int x, int y) {
    int mDisplayOrientation = getActivity().getWindowManager().getDefaultDisplay().getRotation();
    float points[] = new float[2];
    points[0] = (float) x / mTextureView.getWidth();
    points[1] = (float) y / mTextureView.getHeight();
    Matrix rotationMatrix = new Matrix();
    rotationMatrix.setRotate(mDisplayOrientation, 0.5f, 0.5f);
    rotationMatrix.mapPoints(points);
    if (mPreviewRequestBuilder != null) {
        mIsManualFocusing = true;
        updateManualFocus(points[0], points[1]);
        if (mPreviewSession != null) {
            try {
                mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
                    CaptureRequest.CONTROL_AF_TRIGGER_START);
                mPreviewSession.capture(mPreviewRequestBuilder.build(), null, mBackgroundHandler);
                mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
                    CaptureRequest.CONTROL_AF_TRIGGER_IDLE);
                mPreviewSession.setRepeatingRequest(mPreviewRequestBuilder.build(),
                    null, mBackgroundHandler);
            } catch (CameraAccessException | IllegalStateException e) {
                Log.e(TAG, "Failed to set manual focus.", e);
            }
        }
        resumeAutoFocusAfterManualFocus();
    }
}
项目：Android-Code-Demos    文件：Camera2BasicFragment.java    
/**
 * Unlock the focus. This method should be called when still image capture sequence is
 * finished.
 */
private void unlockFocus() {
    try {
        // Reset the auto-focus trigger
        mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
                CameraMetadata.CONTROL_AF_TRIGGER_CANCEL);
        setAutoFlash(mPreviewRequestBuilder);
        mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback,
                mBackgroundHandler);
        // After this, the camera will go back to the normal state of preview.
        mState = STATE_PREVIEW;
        mCaptureSession.setRepeatingRequest(mPreviewRequest, mCaptureCallback,
                mBackgroundHandler);
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}
项目：AppRTC-Android    文件：Camera2Session.java    
@Override
public void onOpened(CameraDevice camera) {
  checkIsOnCameraThread();

  Logging.d(TAG, "Camera opened.");
  cameraDevice = camera;

  final SurfaceTexture surfaceTexture = surfaceTextureHelper.getSurfaceTexture();
  surfaceTexture.setDefaultBufferSize(captureFormat.width, captureFormat.height);
  surface = new Surface(surfaceTexture);
  List<Surface> surfaces = new ArrayList<Surface>();
  surfaces.add(surface);
  if (mediaRecorderSurface != null) {
    Logging.d(TAG, "Add MediaRecorder surface to capture session.");
    surfaces.add(mediaRecorderSurface);
  }
  try {
    camera.createCaptureSession(surfaces, new CaptureSessionCallback(), cameraThreadHandler);
  } catch (CameraAccessException e) {
    reportError("Failed to create capture session. " + e);
    return;
  }
}
项目：CameraKitView    文件：Camera2Fragment.java    
/**
 * Unlock the focus. This method should be called when still image capture sequence is
 * finished.
 */
private void unlockFocus() {
    try {
        // Reset the auto-focus trigger
        mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
            CameraMetadata.CONTROL_AF_TRIGGER_CANCEL);
        mPreviewSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback,
            mBackgroundHandler);

        updateAutoFocus();
        updateFlash(mPreviewRequestBuilder);
        // After this, the camera will go back to the normal state of preview.
        mState = STATE_PREVIEW;
        mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
            CaptureRequest.CONTROL_AF_TRIGGER_IDLE);
        mPreviewSession.setRepeatingRequest(mPreviewRequest, mCaptureCallback,
            mBackgroundHandler);
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}
项目：Bixlight    文件：BixlightService.java    
private boolean setupCameraIfNeeded() {
    if (cameraId != null) {
        return true;
    }
    try {
        cameraId = cameraManager.getCameraIdList()[0];  // Usually back camera is at 0 position
    } catch (CameraAccessException e) {
        Log.v(TAG, "failed to set up camera");
        return false;
    }
    torchEnabled = false;
    Handler handler = new Handler();
    torchCallback = new CameraManager.TorchCallback() {
        @Override
        public void onTorchModeChanged(@NonNull String cameraId, boolean enabled) {
            super.onTorchModeChanged(cameraId, enabled);
            torchEnabled = enabled;
        }
    };
    cameraManager.registerTorchCallback(torchCallback, handler);
    Log.v(TAG, "registered torch callback");
    return true;
}
项目：PXLSRT    文件：Camera2.java    
@Override
void setAutoFocus(boolean autoFocus) {
    if (mAutoFocus == autoFocus) {
        return;
    }
    mAutoFocus = autoFocus;
    if (mPreviewRequestBuilder != null) {
        updateAutoFocus();
        if (mCaptureSession != null) {
            try {
                mCaptureSession.setRepeatingRequest(mPreviewRequestBuilder.build(),
                        mCaptureCallback, null);
            } catch (CameraAccessException e) {
                mAutoFocus = !mAutoFocus; // Revert
            }
        }
    }
}
项目：PXLSRT    文件：Camera2.java    
@Override
void setFlash(int flash) {
    if (mFlash == flash) {
        return;
    }
    int saved = mFlash;
    mFlash = flash;
    if (mPreviewRequestBuilder != null) {
        updateFlash();
        if (mCaptureSession != null) {
            try {
                mCaptureSession.setRepeatingRequest(mPreviewRequestBuilder.build(),
                        mCaptureCallback, null);
            } catch (CameraAccessException e) {
                mFlash = saved; // Revert
            }
        }
    }
}
项目：PXLSRT    文件：Camera2.java    
/**
 * <p>Starts a capture session for camera preview.</p>
 * <p>This rewrites {@link #mPreviewRequestBuilder}.</p>
 * <p>The result will be continuously processed in {@link #mSessionCallback}.</p>
 */
void startCaptureSession() {
    if (!isCameraOpened() || !mPreview.isReady() || mImageReader == null) {
        return;
    }
    Size previewSize = chooseOptimalSize();
    mPreview.setBufferSize(previewSize.getWidth(), previewSize.getHeight());
    Surface surface = mPreview.getSurface();
    try {
        mPreviewRequestBuilder = mCamera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
        mPreviewRequestBuilder.addTarget(surface);
        mCamera.createCaptureSession(Arrays.asList(surface, mImageReader.getSurface()),
                mSessionCallback, null);
    } catch (CameraAccessException e) {
        throw new RuntimeException("Failed to start camera session");
    }
}
项目：Paper-Melody    文件：CalibrationActivity.java    
/**
     * 相机开启
     * @param width     TextureView的宽度
     * @param height    TextureView的高度
     */
    private void openCamera(int width, int height) {

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
                != PackageManager.PERMISSION_GRANTED) {
//            requestCameraPermission();
            return;
        }
        setUpCameraOutputs(width, height);
        configureTransform(width, height);
        try {
            cameraManager.openCamera(cameraID, deviceStateCallback, mainHandler);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
项目：PXLSRT    文件：Camera2.java    
/**
 * Unlocks the auto-focus and restart camera preview. This is supposed to be called after
 * capturing a still picture.
 */
void unlockFocus() {
    mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
            CaptureRequest.CONTROL_AF_TRIGGER_CANCEL);
    try {
        mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback, null);
        updateAutoFocus();
        updateFlash();
        mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
                CaptureRequest.CONTROL_AF_TRIGGER_IDLE);
        mCaptureSession.setRepeatingRequest(mPreviewRequestBuilder.build(), mCaptureCallback,
                null);
        mCaptureCallback.setState(PictureCaptureCallback.STATE_PREVIEW);
    } catch (CameraAccessException e) {
        Log.e(TAG, "Failed to restart camera preview.", e);
    }
}
项目：mao-android    文件：Camera2Fragment.java    
private void openCamera(String cameraId) {
        try {
//            CameraCharacteristics characteristics = mCameraManager.getCameraCharacteristics(cameraId);
//            characteristics.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL);
            if (ActivityCompat.checkSelfPermission(getContext(), permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                // TODO: Consider calling
                //    ActivityCompat#requestPermissions
                // here to request the missing permissions, and then overriding
                //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                //                                          int[] grantResults)
                // to handle the case where the user grants the permission. See the documentation
                // for ActivityCompat#requestPermissions for more details.
                return;
            }
            setUpCameraOutputs(cameraId, ttv_camera.getWidth(), ttv_camera.getHeight());
            configureTransform(ttv_camera.getWidth(), ttv_camera.getHeight());
            mCameraManager.openCamera(cameraId, mCameraDeviceStateCallback, mHandler);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
项目：hella-renderscript    文件：CameraOps.java    
/**
 * Set a repeating burst request.
 */
public void setRepeatingBurst(final List<CaptureRequest> requests,
        final CameraCaptureSession.CaptureCallback listener, final Handler handler) {
    mCameraHandler.post(() -> {
        try {
            mCameraSession.setRepeatingBurst(requests, listener, handler);
        } catch (CameraAccessException e) {
            String errorMessage = mErrorDisplayer.getErrorString(e);
            mErrorDisplayer.showErrorDialog(errorMessage);
        }
    });
}
项目：AndroidRTC    文件：Camera2Session.java    
private void start() {
  checkIsOnCameraThread();
  Logging.d(TAG, "start");

  try {
    cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraId);
  } catch (final CameraAccessException e) {
    reportError("getCameraCharacteristics(): " + e.getMessage());
    return;
  }
  cameraOrientation = cameraCharacteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
  isCameraFrontFacing = cameraCharacteristics.get(CameraCharacteristics.LENS_FACING)
      == CameraMetadata.LENS_FACING_FRONT;

  findCaptureFormat();
  openCamera();
}
项目：androidthings-imageclassifier    文件：CameraHandler.java    
/**
 * Begin a still image capture
 */
public void takePicture() {
    if (mCameraDevice == null) {
        Log.w(TAG, "Cannot capture image. Camera not initialized.");
        return;
    }
    // Here, we create a CameraCaptureSession for capturing still images.
    try {
        mCameraDevice.createCaptureSession(
                Collections.singletonList(mImageReader.getSurface()),
                mSessionCallback,
                null);
    } catch (CameraAccessException cae) {
        Log.d(TAG, "access exception while preparing pic", cae);
    }
}
项目：androidthings-imageclassifier    文件：CameraHandler.java    
/**
 * Begin a still image capture
 */
public void takePicture() {
    if (mCameraDevice == null) {
        Log.w(TAG, "Cannot capture image. Camera not initialized.");
        return;
    }
    // Here, we create a CameraCaptureSession for capturing still images.
    try {
        mCameraDevice.createCaptureSession(
                Collections.singletonList(mImageReader.getSurface()),
                mSessionCallback,
                null);
    } catch (CameraAccessException cae) {
        Log.d(TAG, "access exception while preparing pic", cae);
    }
}
项目：RLibrary    文件：FlashlightController.java    
public void setFlashlight(boolean enabled) {
    boolean pendingError = false;
    synchronized (this) {
        if (mFlashlightEnabled != enabled) {
            mFlashlightEnabled = enabled;
            try {
                mCameraManager.setTorchMode(mCameraId, enabled);
            } catch (CameraAccessException e) {
                Log.e(TAG, "Couldn't set torch mode", e);
                mFlashlightEnabled = false;
                pendingError = true;
            }
        }
    }
    dispatchModeChanged(mFlashlightEnabled);
    if (pendingError) {
        dispatchError();
    }
}
项目：android-Camera2Basic-master    文件：Camera2BasicFragment.java    
/**
 * Unlock the focus. This method should be called when still image capture sequence is
 * finished.
 */
private void unlockFocus() {
    try {
        // Reset the auto-focus trigger
        mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
                CameraMetadata.CONTROL_AF_TRIGGER_CANCEL);
        setAutoFlash(mPreviewRequestBuilder);
        mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback,
                mBackgroundHandler);
        // After this, the camera will go back to the normal state of preview.
        mState = STATE_PREVIEW;
        mCaptureSession.setRepeatingRequest(mPreviewRequest, mCaptureCallback,
                mBackgroundHandler);
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}
项目：Camera2Vision    文件：Camera2Source.java    
/**
 * Unlock the focus. This method should be called when still image capture sequence is
 * finished.
 */
private void unlockFocus() {
    try {
        // Reset the auto-focus trigger
        mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER, CameraMetadata.CONTROL_AF_TRIGGER_CANCEL);
        if(mFlashSupported) {
            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, mFlashMode);
        }
        mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback, mBackgroundHandler);
        // After this, the camera will go back to the normal state of preview.
        mState = STATE_PREVIEW;
        mCaptureSession.setRepeatingRequest(mPreviewRequest, mCaptureCallback, mBackgroundHandler);
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}
项目：AppRTC-Android    文件：Camera2Session.java    
private void start() {
  checkIsOnCameraThread();
  Logging.d(TAG, "start");

  try {
    cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraId);
  } catch (final CameraAccessException e) {
    reportError("getCameraCharacteristics(): " + e.getMessage());
    return;
  }
  cameraOrientation = cameraCharacteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
  isCameraFrontFacing = cameraCharacteristics.get(CameraCharacteristics.LENS_FACING)
      == CameraMetadata.LENS_FACING_FRONT;

  findCaptureFormat();
  openCamera();
}
项目：habpanelviewer    文件：MotionDetectorCamera2.java    
@Override
protected String createCamera(int deviceDegrees) throws CameraException {
    try {
        for (String camId : mCamManager.getCameraIdList()) {
            CameraCharacteristics characteristics = mCamManager.getCameraCharacteristics(camId);
            Integer facing = characteristics.get(CameraCharacteristics.LENS_FACING);

            if (facing == CameraCharacteristics.LENS_FACING_FRONT) {
                Log.d(TAG, "front-facing mCamera found: " + camId);
                return camId;
            }
        }
    } catch (CameraAccessException e) {
        throw new CameraException(e);
    }

    throw new CameraException(mActivity.getString(R.string.frontCameraMissing));
}
项目：habpanelviewer    文件：MotionDetectorCamera2.java    
@Override
protected String getCameraInfo() {
    String camStr = mContext.getString(R.string.camApi2) + "\n";
    CameraManager camManager = (CameraManager) mContext.getSystemService(Context.CAMERA_SERVICE);
    try {
        for (String camId : camManager.getCameraIdList()) {
            camStr += mContext.getString(R.string.cameraId, camId) + ": ";

            CameraCharacteristics characteristics = camManager.getCameraCharacteristics(camId);
            Boolean hasFlash = characteristics.get(CameraCharacteristics.FLASH_INFO_AVAILABLE);
            Integer facing = characteristics.get(CameraCharacteristics.LENS_FACING);

            camStr += (hasFlash ? mContext.getString(R.string.has) : mContext.getString(R.string.no))
                    + " " + mContext.getString(R.string.flash) + ", ";
            camStr += (facing == CameraCharacteristics.LENS_FACING_BACK ?
                    mContext.getString(R.string.backFacing) : mContext.getString(R.string.frontFacing)) + "\n";
        }
    } catch (CameraAccessException e) {
        camStr = mActivity.getString(R.string.failedAccessCamera) + ":" + e.getMessage();
    }

    return camStr.trim();
}
项目：EvilsLive    文件：CameraNew.java    
private void doPreviewConfiguration() {
        if (mCamera == null) {
            return;
        }

        try {
//            mPreviewBuilder = mCamera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
//            mPreviewBuilder.addTarget(surfaceView.getHolder().getSurface());
//            mPreviewBuilder.addTarget(mImageReader.getSurface());
            mPreviewBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
//            mPreviewBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_AUTO);
//            mPreviewBuilder.set(CaptureRequest.FLASH_MODE, CaptureRequest.FLASH_MODE_OFF);
//            mPreviewBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_OFF);

            mPreviewBuilder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, mFps[mFps.length -1 ]);
            mCaptureSession.setRepeatingRequest(mPreviewBuilder.build(), mPreCaptureCallback, mHandler);

        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
项目：SCCameraView    文件：Camera2View.java    
@Override
public void collectRatioSizes() {
    ratioSizeList.clear();
    CameraCharacteristics characteristics;
    StreamConfigurationMap map = null;
    try {
        characteristics = ((CameraManager) getContext().getSystemService(Context.CAMERA_SERVICE)).getCameraCharacteristics(Integer.toString(Integer.parseInt(getCameraId())));
        map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }

    Size[] outputSizes = map.getOutputSizes(SurfaceTexture.class);
    if (outputSizes != null) {
        List<Double> ratioList = new ArrayList<>();
        for (Size size : outputSizes) {
            double ratio = (double) size.getWidth() / (double) size.getHeight();
            if (!ratioList.contains(ratio)) {
                ratioList.add(ratio);
                ratioSizeList.add(new AspectRatio(ratio, size.getWidth(), size.getHeight()));
            }
        }
    }
}
项目：361Camera    文件：Camera2Fragment.java    
/**
 * Called after a RAW/JPEG capture has completed; resets the AF trigger state for the
 * pre-capture sequence.
 * <p/>
 * Call this only with {@link #mCameraStateLock} held.
 */
private void finishedCaptureLocked() {
    try {
        // Reset the auto-focus trigger in case AF didn't run quickly enough.
        if (!mNoAFRun) {
            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
                    CameraMetadata.CONTROL_AF_TRIGGER_CANCEL);

            mCaptureSession.capture(mPreviewRequestBuilder.build(), mPreCaptureCallback,
                    mBackgroundHandler);

            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
                    CameraMetadata.CONTROL_AF_TRIGGER_IDLE);
        }
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}
项目：BWS-Android    文件：CameraCharacteristicsHelper.java    
@NonNull
private <T> T getOrThrow(@NonNull String cameraId, @NonNull CameraCharacteristics.Key<T> key) {
    try {
        CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);

        T value = characteristics.get(key);

        if (value == null) {
            throw new CameraException("could not determine camera characteristic " + key.getName() + " from camera " + cameraId);
        } else {
            return value;
        }
    } catch (CameraAccessException e) {
        throw new CameraException(e);
    }
}
项目：BWS-Android    文件：CameraHelper.java    
/**
 * Does open the front-facing camera of the device.
 * Make sure to close the camera object which is returned within the callback!
 *
 * @param callback set of callback functions which are called when the opening process completed
 * @throws CameraException if the camera could not be opened
 */
@RequiresPermission(Manifest.permission.CAMERA)
public void openFrontFacingCamera(@NonNull CameraDevice.StateCallback callback) {
    try {

        String cameraId = getFrontFacingCameraId();
        if (cameraId == null) {
            throw new CameraException("device is missing a front-facing camera");
        }
        logSupportedHardwareLevel(cameraId);

        manager.openCamera(cameraId, callback, null);

    } catch (CameraAccessException e) {
        throw new CameraException(e);
    }
}
项目：BWS-Android    文件：CameraHelper.java    
/**
 * does setup the repeating capture request for taking images for the preview
 */
@VisibleForTesting
void setupCaptureRequestForPreview(@NonNull CameraCaptureSession previewSession, @NonNull CameraDevice camera,
                                   @NonNull List<Surface> surfaces) {
    try {
        CaptureRequest.Builder previewRequestBuilder = camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
        for (Surface surface : surfaces) {
            previewRequestBuilder.addTarget(surface);
        }
        previewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);

        previewSession.setRepeatingRequest(previewRequestBuilder.build(), null, null);

    } catch (CameraAccessException | IllegalStateException e) {
        throw new CameraException(e);
    }
}
项目：JinsMemeBRIDGE-Android    文件：Camera2BasicFragment.java    
/**
 * Unlock the focus. This method should be called when still image capture sequence is
 * finished.
 */
private void unlockFocus() {
    try {
        // Reset the auto-focus trigger
        mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
                CameraMetadata.CONTROL_AF_TRIGGER_CANCEL);
        setAutoFlash(mPreviewRequestBuilder);
        mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback,
                mBackgroundHandler);
        // After this, the camera will go back to the normal state of preview.
        mState = STATE_PREVIEW;
        mCaptureSession.setRepeatingRequest(mPreviewRequest, mCaptureCallback,
                mBackgroundHandler);
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}
项目：opencv-documentscanner-android    文件：Camera2BasicFragment.java    
/**
     * Lock the focus as the first step for a still image capture.
     */
    private void lockFocus() {
        try {
            Log.d(TAG, "lockFocus: ");
            // This is how to tell the camera to lock focus.
            mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
                    CameraMetadata.CONTROL_AF_TRIGGER_START);
            // Tell #mCaptureCallback to wait for the lock.
//            mState = STATE_WAITING_LOCK;
            mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback,
                    mBackgroundHandler);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
项目：opencv-documentscanner-android    文件：Camera2BasicFragment.java    
/**
 * Run the precapture sequence for capturing a still image. This method should be called when
 * we get a response in {@link #mCaptureCallback} from {@link #lockFocus()}.
 */
private void runPrecaptureSequence() {
    try {
        // This is how to tell the camera to trigger.
        mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER,
                CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER_START);
        // Tell #mCaptureCallback to wait for the precapture sequence to be set.
        mState = STATE_WAITING_PRECAPTURE;
        mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback,
                mBackgroundHandler);
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}
项目：xbot_head    文件：SignInFragment.java    
private void initCamera() {
    cameraID = "" + CameraCharacteristics.LENS_FACING_BACK;
    cameraManager = (CameraManager) getContext().getSystemService(CAMERA_SERVICE);
    try {
        if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.CAMERA)
                != PackageManager.PERMISSION_GRANTED) {
            Toast.makeText(getContext(), "请授权使用照相机", Toast.LENGTH_SHORT).show();
            return;
        }
        //$ process in background
        cameraManager.openCamera(cameraID, cameraStateCallback, backGroundHandler1);
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}
项目：xbot_head    文件：InteractionFragment.java    
@Override
    public void startCamera() {
        try {
            CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(cameraID);
            StreamConfigurationMap configMap = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);

            int width = textureView.getWidth();
            int height = textureView.getHeight();

            //设置一个合适的预览尺寸，防止图像拉伸
//            previewSize = getPreferredPreviewSize(configMap.getOutputSizes(SurfaceTexture.class), width, height);
            previewSize = Util.getPreferredPreviewSize(configMap.getOutputSizes(ImageFormat.JPEG), width, height);
            surfaceTexture.setDefaultBufferSize(previewSize.getWidth(),previewSize.getHeight());
            Log.i(TAG, "previewSize info:" + previewSize.getWidth() + "x" + previewSize.getHeight());

            surface = new Surface(surfaceTexture);

            builder =cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);

            if (surface.isValid()) {
                builder.addTarget(surface);
            }
            Log.i(TAG, "mTextureView info:" + textureView.getWidth() + "x" + textureView.getHeight());

            cameraDevice.createCaptureSession(Arrays.asList(surface),sessionStateCallback,null);

        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }
项目：CameraFragment    文件：Camera2Manager.java    
private void captureStillPicture() {
    try {
        if (null == cameraDevice) {
            return;
        }
        final CaptureRequest.Builder captureBuilder =
                cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
        captureBuilder.addTarget(imageReader.getSurface());

        captureBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
        captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, getPhotoOrientation(configurationProvider.getSensorPosition()));

        CameraCaptureSession.CaptureCallback CaptureCallback = new CameraCaptureSession.CaptureCallback() {
            @Override
            public void onCaptureCompleted(@NonNull CameraCaptureSession session,
                                           @NonNull CaptureRequest request,
                                           @NonNull TotalCaptureResult result) {
                Log.d(TAG, "onCaptureCompleted: ");
            }
        };

        captureSession.stopRepeating();
        captureSession.capture(captureBuilder.build(), CaptureCallback, null);

    } catch (CameraAccessException e) {
        Log.e(TAG, "Error during capturing picture");
    }
}
项目：LongImageCamera    文件：Camera2.java    
/**
 * <p>Starts opening a camera device.</p>
 * <p>The result will be processed in {@link #mCameraDeviceCallback}.</p>
 */
private void startOpeningCamera() {
    try {
        mCameraManager.openCamera(mCameraId, mCameraDeviceCallback, null);
    } catch (CameraAccessException e) {
        throw new RuntimeException("Failed to open camera: " + mCameraId, e);
    }
}
项目：Camara2-Video-Demo-fixed    文件：Camera2VideoFragment.java    
private void closePreviewSession() {
    if (mPreviewSession != null) {
        try {
            mPreviewSession.stopRepeating();
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
        mPreviewSession.close();
        mPreviewSession = null;
    }
}
项目：xbot_head    文件：InteractionFragment.java    
@Override
public void stopCamera() {
    try {
        cameraCaptureSession.abortCaptures();
        cameraDevice.close();
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
    textureView.setVisibility(View.GONE);
}
项目：SIGHT-For-the-Blind    文件：CameraHandler.java    
/**
 * Execute a new capture request within the active session
 */
private void triggerImageCapture() {
    try {
        final CaptureRequest.Builder captureBuilder =
                mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
        captureBuilder.addTarget(mImageReader.getSurface());
        captureBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON);
        Log.d(TAG, "Capture request created.");
        mCaptureSession.capture(captureBuilder.build(), mCaptureCallback, null);
    } catch (CameraAccessException cae) {
        Log.d(TAG, "camera capture exception");
    }
}
项目：Android-Code-Demos    文件：Camera2BasicFragment.java    
/**
 * Lock the focus as the first step for a still image capture.
 */
private void lockFocus() {
    try {
        // This is how to tell the camera to lock focus.
        mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
                CameraMetadata.CONTROL_AF_TRIGGER_START);
        // Tell #mCaptureCallback to wait for the lock.
        mState = STATE_WAITING_LOCK;
        mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback,
                mBackgroundHandler);
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}
项目：EZFilter    文件：Camera2FilterActivity.java    
private void switchCamera() {
    try {
        mCurrentCameraId = (mCurrentCameraId + 1) % mCameraManager.getCameraIdList().length;
        releaseCamera();
        openCamera(mCurrentCameraId);
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}