[решено]
После поиска ответа я не нашел решения для включения fla sh в режиме изображения.
Приложение открывает камеру в фоновом режиме и непрерывно обрабатывает изображения и обнаруживает объекты, но телефон находится в контейнере, в котором нет света, поэтому мне нужно убедиться, что флаг sh всегда открыт.
Могут быть и другие подходы, которые я рассматриваю, и я не уверен, как заставить эти подходы работать также:
Переключение в режим видео. (Поскольку в любом случае я обрабатываю изображения предварительного просмотра с камеры, а в режиме видео режим fla sh может работать без записи видео.)
Установите камеру по умолчанию приложение для другого приложения, которое поддерживает предварительный просмотр изображения с fla sh при нажатии на экран (мне нужно выяснить, как переключиться на другое приложение и как имитировать нажатие, возможно, даже с другим устройством, которое подключено к приложению с Bluetooth и посылает щелчки).
Переопределите API камеры и убедитесь, что Fla sh может быть включен, или просто отключен, и позволить другому приложению включить fla sh.
Похоже, это не работает: (в последнем блоке кода)
Camera.Parameters parameters = camera.getParameters();
parameters.setFlashMode(Camera.Parameters.FLASH_MODE_ON);
Решение 1 или 3 должно быть идеальным, есть идеи, как заставить его работать? Это код, который я использую:
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.app.Fragment;
import android.content.Context;
import android.content.DialogInterface;
import android.content.res.Configuration;
import android.graphics.ImageFormat;
import android.graphics.Matrix;
import android.graphics.RectF;
import android.graphics.SurfaceTexture;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraCaptureSession;
import android.hardware.camera2.CameraCharacteristics;
import android.hardware.camera2.CameraDevice;
import android.hardware.camera2.CameraManager;
import android.hardware.camera2.CaptureRequest;
import android.hardware.camera2.CaptureResult;
import android.hardware.camera2.TotalCaptureResult;
import android.hardware.camera2.params.StreamConfigurationMap;
import android.media.ImageReader;
import android.media.ImageReader.OnImageAvailableListener;
import android.os.Bundle;
import android.os.Handler;
import android.os.HandlerThread;
import android.text.TextUtils;
import android.util.Size;
import android.util.SparseIntArray;
import android.view.LayoutInflater;
import android.view.Surface;
import android.view.TextureView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;
import org.tensorflow.lite.examples.classification.customview.AutoFitTextureView;
import org.tensorflow.lite.examples.classification.env.Logger;
public class CameraConnectionFragment extends Fragment {
private static final Logger LOGGER = new Logger();
/**
* The camera preview size will be chosen to be the smallest frame by pixel size capable of
* containing a DESIRED_SIZE x DESIRED_SIZE square.
*/
private static final int MINIMUM_PREVIEW_SIZE = 320;
/** Conversion from screen rotation to JPEG orientation. */
private static final SparseIntArray ORIENTATIONS = new SparseIntArray();
private static final String FRAGMENT_DIALOG = "dialog";
static {
ORIENTATIONS.append(Surface.ROTATION_0, 90);
ORIENTATIONS.append(Surface.ROTATION_90, 0);
ORIENTATIONS.append(Surface.ROTATION_180, 270);
ORIENTATIONS.append(Surface.ROTATION_270, 180);
}
/** A {@link Semaphore} to prevent the app from exiting before closing the camera. */
private final Semaphore cameraOpenCloseLock = new Semaphore(1);
/** A {@link OnImageAvailableListener} to receive frames as they are available. */
private final OnImageAvailableListener imageListener;
/** The input size in pixels desired by TensorFlow (width and height of a square bitmap). */
private final Size inputSize;
/** The layout identifier to inflate for this Fragment. */
private final int layout;
private final ConnectionCallback cameraConnectionCallback;
private final CameraCaptureSession.CaptureCallback captureCallback =
new CameraCaptureSession.CaptureCallback() {
@Override
public void onCaptureProgressed(
final CameraCaptureSession session,
final CaptureRequest request,
final CaptureResult partialResult) {}
@Override
public void onCaptureCompleted(
final CameraCaptureSession session,
final CaptureRequest request,
final TotalCaptureResult result) {}
};
/** ID of the current {@link CameraDevice}. */
private String cameraId;
/** An {@link AutoFitTextureView} for camera preview. */
private AutoFitTextureView textureView;
/** A {@link CameraCaptureSession } for camera preview. */
private CameraCaptureSession captureSession;
/** A reference to the opened {@link CameraDevice}. */
private CameraDevice cameraDevice;
/** The rotation in degrees of the camera sensor from the display. */
private Integer sensorOrientation;
/** The {@link Size} of camera preview. */
private Size previewSize;
/** An additional thread for running tasks that shouldn't block the UI. */
private HandlerThread backgroundThread;
/** A {@link Handler} for running tasks in the background. */
private Handler backgroundHandler;
/**
* {@link TextureView.SurfaceTextureListener} handles several lifecycle events on a {@link
* TextureView}.
*/
private final TextureView.SurfaceTextureListener surfaceTextureListener =
new TextureView.SurfaceTextureListener() {
@Override
public void onSurfaceTextureAvailable(
final SurfaceTexture texture, final int width, final int height) {
openCamera(width, height);
}
@Override
public void onSurfaceTextureSizeChanged(
final SurfaceTexture texture, final int width, final int height) {
configureTransform(width, height);
}
@Override
public boolean onSurfaceTextureDestroyed(final SurfaceTexture texture) {
return true;
}
@Override
public void onSurfaceTextureUpdated(final SurfaceTexture texture) {}
};
/** An {@link ImageReader} that handles preview frame capture. */
private ImageReader previewReader;
/** {@link CaptureRequest.Builder} for the camera preview */
private CaptureRequest.Builder previewRequestBuilder;
/** {@link CaptureRequest} generated by {@link #previewRequestBuilder} */
private CaptureRequest previewRequest;
/** {@link CameraDevice.StateCallback} is called when {@link CameraDevice} changes its state. */
private final CameraDevice.StateCallback stateCallback =
new CameraDevice.StateCallback() {
@Override
public void onOpened(final CameraDevice cd) {
// This method is called when the camera is opened. We start camera preview here.
cameraOpenCloseLock.release();
cameraDevice = cd;
createCameraPreviewSession();
}
@Override
public void onDisconnected(final CameraDevice cd) {
cameraOpenCloseLock.release();
cd.close();
cameraDevice = null;
}
@Override
public void onError(final CameraDevice cd, final int error) {
cameraOpenCloseLock.release();
cd.close();
cameraDevice = null;
final Activity activity = getActivity();
if (null != activity) {
activity.finish();
}
}
};
@SuppressLint("ValidFragment")
private CameraConnectionFragment(
final ConnectionCallback connectionCallback,
final OnImageAvailableListener imageListener,
final int layout,
final Size inputSize) {
this.cameraConnectionCallback = connectionCallback;
this.imageListener = imageListener;
this.layout = layout;
this.inputSize = inputSize;
}
/**
* Given {@code choices} of {@code Size}s supported by a camera, chooses the smallest one whose
* width and height are at least as large as the minimum of both, or an exact match if possible.
*
* @param choices The list of sizes that the camera supports for the intended output class
* @param width The minimum desired width
* @param height The minimum desired height
* @return The optimal {@code Size}, or an arbitrary one if none were big enough
*/
protected static Size chooseOptimalSize(final Size[] choices, final int width, final int height) {
final int minSize = Math.max(Math.min(width, height), MINIMUM_PREVIEW_SIZE);
final Size desiredSize = new Size(width, height);
// Collect the supported resolutions that are at least as big as the preview Surface
boolean exactSizeFound = false;
final List<Size> bigEnough = new ArrayList<Size>();
final List<Size> tooSmall = new ArrayList<Size>();
for (final Size option : choices) {
if (option.equals(desiredSize)) {
// Set the size but don't return yet so that remaining sizes will still be logged.
exactSizeFound = true;
}
if (option.getHeight() >= minSize && option.getWidth() >= minSize) {
bigEnough.add(option);
} else {
tooSmall.add(option);
}
}
LOGGER.i("Desired size: " + desiredSize + ", min size: " + minSize + "x" + minSize);
LOGGER.i("Valid preview sizes: [" + TextUtils.join(", ", bigEnough) + "]");
LOGGER.i("Rejected preview sizes: [" + TextUtils.join(", ", tooSmall) + "]");
if (exactSizeFound) {
LOGGER.i("Exact size match found.");
return desiredSize;
}
// Pick the smallest of those, assuming we found any
if (bigEnough.size() > 0) {
final Size chosenSize = Collections.min(bigEnough, new CompareSizesByArea());
LOGGER.i("Chosen size: " + chosenSize.getWidth() + "x" + chosenSize.getHeight());
return chosenSize;
} else {
LOGGER.e("Couldn't find any suitable preview size");
return choices[0];
}
}
public static CameraConnectionFragment newInstance(
final ConnectionCallback callback,
final OnImageAvailableListener imageListener,
final int layout,
final Size inputSize) {
return new CameraConnectionFragment(callback, imageListener, layout, inputSize);
}
/**
* Shows a {@link Toast} on the UI thread.
*
* @param text The message to show
*/
private void showToast(final String text) {
final Activity activity = getActivity();
if (activity != null) {
activity.runOnUiThread(
new Runnable() {
@Override
public void run() {
Toast.makeText(activity, text, Toast.LENGTH_SHORT).show();
}
});
}
}
@Override
public View onCreateView(
final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) {
return inflater.inflate(layout, container, false);
}
@Override
public void onViewCreated(final View view, final Bundle savedInstanceState) {
textureView = (AutoFitTextureView) view.findViewById(R.id.texture);
}
@Override
public void onActivityCreated(final Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
@Override
public void onResume() {
super.onResume();
startBackgroundThread();
// When the screen is turned off and turned back on, the SurfaceTexture is already
// available, and "onSurfaceTextureAvailable" will not be called. In that case, we can open
// a camera and start preview from here (otherwise, we wait until the surface is ready in
// the SurfaceTextureListener).
if (textureView.isAvailable()) {
openCamera(textureView.getWidth(), textureView.getHeight());
} else {
textureView.setSurfaceTextureListener(surfaceTextureListener);
}
}
@Override
public void onPause() {
closeCamera();
stopBackgroundThread();
super.onPause();
}
public void setCamera(String cameraId) {
this.cameraId = cameraId;
}
/** Sets up member variables related to camera. */
private void setUpCameraOutputs() {
final Activity activity = getActivity();
final CameraManager manager = (CameraManager) activity.getSystemService(Context.CAMERA_SERVICE);
try {
final CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);
final StreamConfigurationMap map =
characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
sensorOrientation = characteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
// Danger, W.R.! Attempting to use too large a preview size could exceed the camera
// bus' bandwidth limitation, resulting in gorgeous previews but the storage of
// garbage capture data.
previewSize =
chooseOptimalSize(
map.getOutputSizes(SurfaceTexture.class),
inputSize.getWidth(),
inputSize.getHeight());
// We fit the aspect ratio of TextureView to the size of preview we picked.
final int orientation = getResources().getConfiguration().orientation;
if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
textureView.setAspectRatio(previewSize.getWidth(), previewSize.getHeight());
textureView.setVisibility(View.GONE);
} else {
textureView.setAspectRatio(previewSize.getHeight(), previewSize.getWidth());
textureView.setVisibility(View.GONE);
}
} catch (final CameraAccessException e) {
LOGGER.e(e, "Exception!");
} catch (final NullPointerException e) {
// Currently an NPE is thrown when the Camera2API is used but not supported on the
// device this code runs.
// TODO(andrewharp): abstract ErrorDialog/RuntimeException handling out into new method and
// reuse throughout app.
ErrorDialog.newInstance(getString(R.string.camera_error))
.show(getChildFragmentManager(), FRAGMENT_DIALOG);
throw new RuntimeException(getString(R.string.camera_error));
}
cameraConnectionCallback.onPreviewSizeChosen(previewSize, sensorOrientation);
}
/** Opens the camera specified by {@link CameraConnectionFragment#cameraId}. */
private void openCamera(final int width, final int height) {
setUpCameraOutputs();
configureTransform(width, height);
final Activity activity = getActivity();
final CameraManager manager = (CameraManager) activity.getSystemService(Context.CAMERA_SERVICE);
try {
if (!cameraOpenCloseLock.tryAcquire(2500, TimeUnit.MILLISECONDS)) {
throw new RuntimeException("Time out waiting to lock camera opening.");
}
manager.openCamera(cameraId, stateCallback, backgroundHandler);
} catch (final CameraAccessException e) {
LOGGER.e(e, "Exception!");
} catch (final InterruptedException e) {
throw new RuntimeException("Interrupted while trying to lock camera opening.", e);
}
}
/** Closes the current {@link CameraDevice}. */
private void closeCamera() {
try {
cameraOpenCloseLock.acquire();
if (null != captureSession) {
captureSession.close();
captureSession = null;
}
if (null != cameraDevice) {
cameraDevice.close();
cameraDevice = null;
}
if (null != previewReader) {
previewReader.close();
previewReader = null;
}
} catch (final InterruptedException e) {
throw new RuntimeException("Interrupted while trying to lock camera closing.", e);
} finally {
cameraOpenCloseLock.release();
}
}
/** Starts a background thread and its {@link Handler}. */
private void startBackgroundThread() {
backgroundThread = new HandlerThread("ImageListener");
backgroundThread.start();
backgroundHandler = new Handler(backgroundThread.getLooper());
}
/** Stops the background thread and its {@link Handler}. */
private void stopBackgroundThread() {
backgroundThread.quitSafely();
try {
backgroundThread.join();
backgroundThread = null;
backgroundHandler = null;
} catch (final InterruptedException e) {
LOGGER.e(e, "Exception!");
}
}
/** Creates a new {@link CameraCaptureSession} for camera preview. */
private void createCameraPreviewSession() {
try {
final SurfaceTexture texture = textureView.getSurfaceTexture();
assert texture != null;
// We configure the size of default buffer to be the size of camera preview we want.
texture.setDefaultBufferSize(previewSize.getWidth(), previewSize.getHeight());
// This is the output Surface we need to start preview.
final Surface surface = new Surface(texture);
// We set up a CaptureRequest.Builder with the output Surface.
previewRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
previewRequestBuilder.addTarget(surface);
LOGGER.i("Opening camera preview: " + previewSize.getWidth() + "x" + previewSize.getHeight());
// Create the reader for the preview frames.
previewReader =
ImageReader.newInstance(
previewSize.getWidth(), previewSize.getHeight(), ImageFormat.YUV_420_888, 2);
previewReader.setOnImageAvailableListener(imageListener, backgroundHandler);
previewRequestBuilder.addTarget(previewReader.getSurface());
// Here, we create a CameraCaptureSession for camera preview.
cameraDevice.createCaptureSession(
Arrays.asList(surface, previewReader.getSurface()),
new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(final CameraCaptureSession cameraCaptureSession) {
// The camera is already closed
if (null == cameraDevice) {
return;
}
// When the session is ready, we start displaying the preview.
captureSession = cameraCaptureSession;
try {
// Auto focus should be continuous for camera preview.
previewRequestBuilder.set(
CaptureRequest.CONTROL_AF_MODE,
CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
// Flash is automatically enabled when necessary.
// previewRequestBuilder.set(
// CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);
previewRequestBuilder.set(
CaptureRequest.FLASH_MODE, CaptureRequest.CONTROL_AE_MODE_ON_ALWAYS_FLASH);
// Finally, we start displaying the camera preview.
previewRequest = previewRequestBuilder.build();
captureSession.setRepeatingRequest(
previewRequest, captureCallback, backgroundHandler);
} catch (final CameraAccessException e) {
LOGGER.e(e, "Exception!");
}
}
@Override
public void onConfigureFailed(final CameraCaptureSession cameraCaptureSession) {
showToast("Failed");
}
},
null);
} catch (final CameraAccessException e) {
LOGGER.e(e, "Exception!");
}
}
}
}
Второй:
public class LegacyCameraConnectionFragment extends Fragment {
private static final Logger LOGGER = new Logger();
/** Conversion from screen rotation to JPEG orientation. */
private static final SparseIntArray ORIENTATIONS = new SparseIntArray();
static {
ORIENTATIONS.append(Surface.ROTATION_0, 90);
ORIENTATIONS.append(Surface.ROTATION_90, 0);
ORIENTATIONS.append(Surface.ROTATION_180, 270);
ORIENTATIONS.append(Surface.ROTATION_270, 180);
}
private Camera camera;
private Camera.PreviewCallback imageListener;
private Size desiredSize;
/** The layout identifier to inflate for this Fragment. */
private int layout;
/** An {@link AutoFitTextureView} for camera preview. */
private AutoFitTextureView textureView;
/**
* {@link TextureView.SurfaceTextureListener} handles several lifecycle events on a {@link
* TextureView}.
*/
private final TextureView.SurfaceTextureListener surfaceTextureListener =
new TextureView.SurfaceTextureListener() {
@Override
public void onSurfaceTextureAvailable(
final SurfaceTexture texture, final int width, final int height) {
int index = getCameraId();
camera = Camera.open(index);
try {
Camera.Parameters parameters = camera.getParameters();
List<String> focusModes = parameters.getSupportedFocusModes();
if (focusModes != null
&& focusModes.contains(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE)) {
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
}
List<Camera.Size> cameraSizes = parameters.getSupportedPreviewSizes();
Size[] sizes = new Size[cameraSizes.size()];
int i = 0;
for (Camera.Size size : cameraSizes) {
sizes[i++] = new Size(size.width, size.height);
}
Size previewSize =
CameraConnectionFragment.chooseOptimalSize(
sizes, desiredSize.getWidth(), desiredSize.getHeight());
parameters.setPreviewSize(previewSize.getWidth(), previewSize.getHeight());
camera.setDisplayOrientation(90);
camera.setParameters(parameters);
camera.setPreviewTexture(texture);
} catch (IOException exception) {
camera.release();
}
camera.setPreviewCallbackWithBuffer(imageListener);
Camera.Size s = camera.getParameters().getPreviewSize();
camera.addCallbackBuffer(new byte[ImageUtils.getYUVByteSize(s.height, s.width)]);
textureView.setAspectRatio(s.height, s.width);
camera.startPreview();
}
@Override
public void onSurfaceTextureSizeChanged(
final SurfaceTexture texture, final int width, final int height) {}
@Override
public boolean onSurfaceTextureDestroyed(final SurfaceTexture texture) {
return true;
}
@Override
public void onSurfaceTextureUpdated(final SurfaceTexture texture) {}
};
/** An additional thread for running tasks that shouldn't block the UI. */
private HandlerThread backgroundThread;
@SuppressLint("ValidFragment")
public LegacyCameraConnectionFragment(
final Camera.PreviewCallback imageListener, final int layout, final Size desiredSize) {
this.imageListener = imageListener;
this.layout = layout;
this.desiredSize = desiredSize;
}
@Override
public View onCreateView(
final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) {
return inflater.inflate(layout, container, false);
}
@Override
public void onViewCreated(final View view, final Bundle savedInstanceState) {
textureView = (AutoFitTextureView) view.findViewById(R.id.texture);
}
@Override
public void onActivityCreated(final Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
@Override
public void onResume() {
super.onResume();
startBackgroundThread();
// When the screen is turned off and turned back on, the SurfaceTexture is already
// available, and "onSurfaceTextureAvailable" will not be called. In that case, we can open
// a camera and start preview from here (otherwise, we wait until the surface is ready in
// the SurfaceTextureListener).
if (textureView.isAvailable()) {
camera.startPreview();
} else {
textureView.setSurfaceTextureListener(surfaceTextureListener);
}
}
@Override
public void onPause() {
stopCamera();
stopBackgroundThread();
super.onPause();
}
/** Starts a background thread and its {@link Handler}. */
private void startBackgroundThread() {
backgroundThread = new HandlerThread("CameraBackground");
backgroundThread.start();
}
/** Stops the background thread and its {@link Handler}. */
private void stopBackgroundThread() {
backgroundThread.quitSafely();
try {
backgroundThread.join();
backgroundThread = null;
} catch (final InterruptedException e) {
LOGGER.e(e, "Exception!");
}
}
protected void stopCamera() {
if (camera != null) {
camera.stopPreview();
camera.setPreviewCallback(null);
camera.release();
camera = null;
}
}
private int getCameraId() {
CameraInfo ci = new CameraInfo();
for (int i = 0; i < Camera.getNumberOfCameras(); i++) {
Camera.getCameraInfo(i, ci);
if (ci.facing == CameraInfo.CAMERA_FACING_BACK) return i;
}
return -1; // No camera found
}
}
РЕШЕНИЕ: во втором коде блока:
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE,
CaptureRequest.CONTROL_AE_MODE_ON);
mPreviewRequestBuilder.set(CaptureRequest.FLASH_MODE,
CaptureRequest.FLASH_MODE_TORCH);
и в первом коде блока:
//Check Whether device supports AutoFlash, If you YES then set AutoFlash
List<String> flashModes = parameters.getSupportedFlashModes();
if (flashModes.contains(android.hardware.Camera.Parameters.FLASH_MODE_AUTO))
{
parameters.setFlashMode(parameters.FLASH_MODE_AUTO);
}