Java 使用IntentService与Camera2合影
我正在尝试创建一个应用程序,它在不显示预览的情况下拍摄照片。使用本教程-如果我使用和活动,我设法使它工作。现在,我尝试将处理拍照操作的代码移动到和IntentService中 到目前为止,我得到的是: MainActivity.java-活动Java 使用IntentService与Camera2合影,java,android,android-intent,android-service,Java,Android,Android Intent,Android Service,我正在尝试创建一个应用程序,它在不显示预览的情况下拍摄照片。使用本教程-如果我使用和活动,我设法使它工作。现在,我尝试将处理拍照操作的代码移动到和IntentService中 到目前为止,我得到的是: MainActivity.java-活动 private void startCameraService() { if(ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManage
private void startCameraService()
{
if(ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED)
{
ActivityCompat.requestPermissions(this,new String[]{
Manifest.permission.CAMERA,
Manifest.permission.WRITE_EXTERNAL_STORAGE
},REQUEST_CAMERA_PERMISSION);
return;
}
Intent cameraService = new Intent(this, CameraService.class);
startService(cameraService);
}
CameraService.java-(意向服务)
但是CameraDevice摄像机是空的
为什么这是一项活动而不是一项意向服务,有什么建议吗?如果您能帮助我,我将不胜感激。在调用
onHandleIntent()
后,调用了stopSelf()
。因此,当摄像头事件发生时,服务将停止。我想你必须设法让Looper.loop()
在你的onHandleIntent()中运行,你找到解决方案了吗?我正在寻找同样的,运行camera2作为intentService
public class CameraService extends IntentService {
//Input image state
private static final SparseIntArray ORIENTATIONS = new SparseIntArray();
static{
ORIENTATIONS.append(Surface.ROTATION_90,90);
ORIENTATIONS.append(Surface.ROTATION_0,0);
ORIENTATIONS.append(Surface.ROTATION_180,270);
ORIENTATIONS.append(Surface.ROTATION_270,180);
}
//Camera variables
private String cameraId;
private CameraDevice cameraDevice;
private CameraCaptureSession cameraCaptureSessions;
private CaptureRequest.Builder captureRequestBuilder;
private Size imageDimension;
private ImageReader imageReader;
//Output file variables
private File file;
private static final int REQUEST_CAMERA_PERMISSION = 200;
private boolean mFlashSupported;
private Handler mBackgroundHandler;
private HandlerThread mBackgroundThread;
//the orientation of the device
int rotation;
//bitmap of the taken photo
private Bitmap bitmapImage;
//camera state callback
CameraDevice.StateCallback stateCallback = new CameraDevice.StateCallback() {
@Override
public void onOpened(@NonNull CameraDevice camera) {
cameraDevice = camera;
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
public void onDisconnected(@NonNull CameraDevice cameraDevice) {
cameraDevice.close();
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
public void onError(@NonNull CameraDevice cameraDevice, int i) {
cameraDevice.close();
cameraDevice=null;
}
};
public CameraService() {
super("CameraService");
}
@Override
protected void onHandleIntent(Intent intent)
{
takePicture();
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private void takePicture() {
Log.d("CameraService","inside TakePicture");
if(cameraDevice == null)
{
return;
}
CameraManager manager = (CameraManager)getSystemService(Context.CAMERA_SERVICE);
try{
CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraDevice.getId());
Size[] jpegSizes = null;
if(characteristics != null)
jpegSizes = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)
.getOutputSizes(ImageFormat.JPEG);
//Capture image with custom size
int width = 640;
int height = 480;
if(jpegSizes != null && jpegSizes.length > 0)
{
width = jpegSizes[0].getWidth();
height = jpegSizes[0].getHeight();
}
final ImageReader reader = ImageReader.newInstance(width,height,ImageFormat.JPEG,1);
List<Surface> outputSurface = new ArrayList<>(2);
outputSurface.add(reader.getSurface());
final CaptureRequest.Builder captureBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
captureBuilder.addTarget(reader.getSurface());
captureBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
File file = new File(Environment.getExternalStorageDirectory() + "/"+UUID.randomUUID().toString()+".jpg");
ImageReader.OnImageAvailableListener readerListener = new ImageReader.OnImageAvailableListener() {
@Override
public void onImageAvailable(ImageReader imageReader) {
Image image = null;
try{
image = reader.acquireLatestImage();
ByteBuffer buffer = image.getPlanes()[0].getBuffer();
byte[] bytes = new byte[buffer.capacity()];
buffer.get(bytes);
save(bytes);
bitmapImage = BitmapFactory.decodeByteArray(bytes, 0, bytes.length, null);
//TODO: fix the orientation so despite the phone position the photo is always correct and not rotated
// use ORIENTATIONS.get(rotation)
bitmapImage = rotateImage(bitmapImage, 270);
}
catch (Exeption e)
{
e.printStackTrace();
}
finally {
{
if(image != null)
image.close();
}
}
}
private void save(byte[] bytes) throws IOException {
OutputStream outputStream = null;
try{
outputStream = new FileOutputStream(file);
outputStream.write(bytes);
}finally {
if(outputStream != null)
outputStream.close();
}
}
};
reader.setOnImageAvailableListener(readerListener,mBackgroundHandler);
final CameraCaptureSession.CaptureCallback captureListener = new CameraCaptureSession.CaptureCallback() {
@Override
public void onCaptureCompleted(@NonNull CameraCaptureSession session, @NonNull CaptureRequest request, @NonNull TotalCaptureResult result) {
super.onCaptureCompleted(session, request, result);
Log.d("CameraService","image is saved");
}
};
cameraDevice.createCaptureSession(outputSurface, new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) {
try{
cameraCaptureSession.capture(captureBuilder.build(),captureListener,mBackgroundHandler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@Override
public void onConfigureFailed(@NonNull CameraCaptureSession cameraCaptureSession) {
}
},mBackgroundHandler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
public static Bitmap rotateImage(Bitmap source, float angle) {
Matrix matrix = new Matrix();
matrix.postRotate(angle);
return Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(),
matrix, true);
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private void openCamera() {
CameraManager manager = (CameraManager)getSystemService(Context.CAMERA_SERVICE);
try{
cameraId = manager.getCameraIdList()[1];
CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);
StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
assert map != null;
imageDimension = map.getOutputSizes(SurfaceTexture.class)[0];
manager.openCamera(cameraId,stateCallback,null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
}
//camera state callback
CameraDevice.StateCallback stateCallback = new CameraDevice.StateCallback() {
@Override
public void onOpened(@NonNull CameraDevice camera) {
cameraDevice = camera;
}