android-使用camera2 API获取单个图像并使用ImageView显示

概述我想使用Camera2API从相机中获取单个帧并使用ImageView显示它.我发现了一些密切的问题,例如https://stackoverflow.com/questions/25462277/camera-preview-image-data-processing-with-android-l-and-camera2-api而且我也看过Camera2Basic示例,但是它太复杂了,并不是我真正需

我想使用Camera2 API从相机中获取单个帧并使用ImageVIEw显示它.
我发现了一些密切的问题,例如

https://stackoverflow.com/questions/25462277/camera-preview-image-data-processing-with-android-l-and-camera2-api

而且我也看过Camera2Basic示例,但是它太复杂了,并不是我真正需要的.

我写的代码是基于我在网络上看到的一些示例,应该可以执行,但无法正常工作,我不知道为什么.

该应用程序不会崩溃,但不会在ImageVIEw上显示任何内容.
我在任何函数调用中都使用了Log消息,以尝试使logcat保持清晰.

另外,该应用程序的logcat表示“该应用程序可能在后台执行了太多工作.”我看不到这是怎么回事,因为我发出了单个captureRequest而不是RepeatingCaptureRequest.

这是代码和logcat：
码：

public class CameraimageReaderActivity extends AppCompatActivity {private final static String TAG = "CAMERA_IMAGE_READY: ";private ImageReader imageReader;private String cameraID;private CameraDevice camera;private HandlerThread handlerThread;private Handler handler;private Surface imageReaderSurface;private ImageVIEw imageVIEw;private CameraDevice.StateCallback cameraStateCallback = new CameraDevice.StateCallback() {    @OverrIDe    public voID onopened(CameraDevice cameraDevice) {        Log.d(TAG, "onopend: CAMERA OPENED");        camera = cameraDevice;        getFrames();    }    @OverrIDe    public voID ondisconnected(CameraDevice cameraDevice) {        Log.d(TAG, "ondisconnected: CAMERA disCONNECTED");        cameraDevice.close();        camera = null;    }    @OverrIDe    public voID one rror(CameraDevice cameraDevice, int i) {        Log.d(TAG, "onError: CAMERA ERROR");        cameraDevice.close();        camera = null;    }};private CameraCaptureSession.StateCallback captureSessionStateCallback = new CameraCaptureSession.StateCallback() {    @OverrIDe    public voID onConfigured(CameraCaptureSession cameraCaptureSession) {        Log.d(TAG, "onConfigured: build request and capture");        try {            CaptureRequest.Builder requestBuilder = cameraCaptureSession.getDevice().createCaptureRequest(CameraDevice.TEMPLATE_RECORD);            requestBuilder.addTarget(imageReaderSurface);            cameraCaptureSession.capture(requestBuilder.build(), null, handler);        } catch (CameraAccessException e) {            Log.d(TAG, "onConfigured: CANT CREATE CAPTURE REQUEST");            e.printstacktrace();        }    }    @OverrIDe    public voID onConfigureFailed(CameraCaptureSession cameraCaptureSession) {        Log.d(TAG, "onConfiguredFailed: CANT CONfigURE CAMERA");    }};private ImageReader.OnImageAvailableListener imageReaderListener = new ImageReader.OnImageAvailableListener() {    @OverrIDe    public voID onImageAvailable(ImageReader imageReader) {        Log.d(TAG, "onImageAvailable: IMAGE AVAILABLE");        Image image = imageReader.acquireLatestimage();        int imgFormat = image.getFormat();        ByteBuffer pixelArray1 = image.getPlanes()[0].getBuffer();        int pixelStrIDe = image.getPlanes()[0].getPixelStrIDe();        int rowStrIDe = image.getPlanes()[0].getRowStrIDe();        int rowpadding = rowStrIDe - pixelStrIDe * 640;        Bitmap bitmap = Bitmap.createBitmap(640 + rowpadding/pixelStrIDe, 480, Bitmap.Config.RGB_565);        bitmap.copyPixelsFromBuffer(pixelArray1);        imageVIEw.setimageBitmap(bitmap);        image.close();    }};/** * Sets the cameraID with the front camera ID and sets imageReader propertIEs. */public voID setupCamera(int wIDth, int height) {    imageReader = ImageReader.newInstance(wIDth, height, ImageFormat.RGB_565, 30);    CameraManager cameraManager = (CameraManager) getSystemService(CAMERA_SERVICE);    try {        for (String allCamerasID : cameraManager.getCameraIDList()) {            Cameracharacteristics cameracharacteristics = cameraManager.getCameracharacteristics(allCamerasID);            if (cameracharacteristics.get(Cameracharacteristics.LENS_FACING) == Cameracharacteristics.LENS_FACING_FRONT) {                continue;            }            cameraID = allCamerasID;            Log.d(TAG, "setupCamera: CameraID is: " + cameraID);            return;        }    } catch (CameraAccessException e) {        e.printstacktrace();    }}/** * Connects to the front facing camera. * After the connection to the camera, the onopened callback method will be invoked. */public voID connectCamera() {    CameraManager cameraManager = (CameraManager) getSystemService(CAMERA_SERVICE);    try {        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {            Log.d(TAG, "CANT OPEN CAMERA");            // 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;        }        cameraManager.openCamera(cameraID, cameraStateCallback, handler);        Log.d(TAG, "connectCamera: CAMERA OPENED!");    } catch (CameraAccessException e) {        e.printstacktrace();    }}/** * Build the captureSessionRequest and start in repeat. */public voID getFrames() {    Log.d(TAG, "getFrames: CREATE CAPTURE SESSION");    imageReaderSurface = imageReader.getSurface();    List<Surface> surfaceList = new ArrayList<>();    surfaceList.add(imageReaderSurface);    try {        camera.createCaptureSession(surfaceList, captureSessionStateCallback, handler);    } catch (CameraAccessException e) {        e.printstacktrace();    }}public voID startBackgroundThread() {    handlerThread = new HandlerThread("CameraimageReaderActivity");    handlerThread.start();    handler = new Handler(handlerThread.getLooper());}public voID stopBackgroundThread() {    handlerThread.quitSafely();    try {        handlerThread.join();        handlerThread = null;        handler = null;    } catch (InterruptedException e) {        e.printstacktrace();    }}public voID closeCamera() {    if (camera != null) {        camera.close();        camera = null;    }}@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_camera_image_reader);    imageVIEw = (ImageVIEw) findVIEwByID(R.ID.imageVIEw);    setupCamera(640, 480);    connectCamera();}@OverrIDeprotected voID onPause() {    closeCamera();    startBackgroundThread();    super.onPause();}@OverrIDeprotected voID onResume() {    super.onResume();    startBackgroundThread();    //connectCamera();}

和(相关的)logcat：

03-22 14:27:32.900 18806-18806/com.example.noamm_000.talkwithcompviawifi D/CAMERA_IMAGE_READY:: setupCamera: CameraID is: 003-22 14:27:32.904 18806-18806/com.example.noamm_000.talkwithcompviawifi W/ArrayUtils: Ignoring invalID value mw_continuous-picture03-22 14:27:32.905 18806-18806/com.example.noamm_000.talkwithcompviawifi W/ArrayUtils: Ignoring invalID value emboss03-22 14:27:32.905 18806-18806/com.example.noamm_000.talkwithcompviawifi W/ArrayUtils: Ignoring invalID value sketch03-22 14:27:32.905 18806-18806/com.example.noamm_000.talkwithcompviawifi W/ArrayUtils: Ignoring invalID value neon03-22 14:27:32.905 18806-18806/com.example.noamm_000.talkwithcompviawifi W/ArrayUtils: Ignoring invalID value asd03-22 14:27:32.905 18806-18806/com.example.noamm_000.talkwithcompviawifi W/ArrayUtils: Ignoring invalID value backlight03-22 14:27:32.905 18806-18806/com.example.noamm_000.talkwithcompviawifi W/ArrayUtils: Ignoring invalID value flowers03-22 14:27:32.905 18806-18806/com.example.noamm_000.talkwithcompviawifi W/ArrayUtils: Ignoring invalID value AR03-22 14:27:32.912 18806-18806/com.example.noamm_000.talkwithcompviawifi I/CameraManager: Using legacy camera HAL.03-22 14:27:33.685 18806-18806/com.example.noamm_000.talkwithcompviawifi W/ArrayUtils: Ignoring invalID value mw_continuous-picture03-22 14:27:33.685 18806-18806/com.example.noamm_000.talkwithcompviawifi W/ArrayUtils: Ignoring invalID value emboss03-22 14:27:33.685 18806-18806/com.example.noamm_000.talkwithcompviawifi W/ArrayUtils: Ignoring invalID value sketch03-22 14:27:33.685 18806-18806/com.example.noamm_000.talkwithcompviawifi W/ArrayUtils: Ignoring invalID value neon03-22 14:27:33.686 18806-18806/com.example.noamm_000.talkwithcompviawifi W/ArrayUtils: Ignoring invalID value asd03-22 14:27:33.686 18806-18806/com.example.noamm_000.talkwithcompviawifi W/ArrayUtils: Ignoring invalID value backlight03-22 14:27:33.686 18806-18806/com.example.noamm_000.talkwithcompviawifi W/ArrayUtils: Ignoring invalID value flowers03-22 14:27:33.686 18806-18806/com.example.noamm_000.talkwithcompviawifi W/ArrayUtils: Ignoring invalID value AR03-22 14:27:33.702 18806-18806/com.example.noamm_000.talkwithcompviawifi D/CAMERA_IMAGE_READY:: connectCamera: CAMERA OPENED!03-22 14:27:33.719 18806-18806/com.example.noamm_000.talkwithcompviawifi I/Choreographer: Skipped 56 frames!  The application may be doing too much work on its main thread.03-22 14:27:33.787 18806-18806/com.example.noamm_000.talkwithcompviawifi D/CAMERA_IMAGE_READY:: onopend: CAMERA OPENED03-22 14:27:33.787 18806-18806/com.example.noamm_000.talkwithcompviawifi D/CAMERA_IMAGE_READY:: getFrames: CREATE CAPTURE SESSION03-22 14:27:33.789 18806-18806/com.example.noamm_000.talkwithcompviawifi I/CameraDeviceState: Legacy camera service Transitioning to state CONfigURING03-22 14:27:33.789 18806-19149/com.example.noamm_000.talkwithcompviawifi I/RequestThread-0: Configure outputs: 1 surfaces configured.03-22 14:27:33.790 18806-19149/com.example.noamm_000.talkwithcompviawifi D/Camera: app passed NulL surface03-22 14:27:33.838 18806-18806/com.example.noamm_000.talkwithcompviawifi I/CameraDeviceState: Legacy camera service Transitioning to state IDLE03-22 14:27:33.843 18806-19150/com.example.noamm_000.talkwithcompviawifi D/CAMERA_IMAGE_READY:: onConfigured: build request and capture03-22 14:27:33.874 18806-19149/com.example.noamm_000.talkwithcompviawifi W/LegacyRequestMapper: convertRequestMetadata - control.awbRegions setting is not supported, ignoring value03-22 14:27:33.875 18806-19149/com.example.noamm_000.talkwithcompviawifi W/LegacyRequestMapper: Only received metering rectangles with weight 0.03-22 14:27:33.875 18806-19149/com.example.noamm_000.talkwithcompviawifi W/LegacyRequestMapper: Only received metering rectangles with weight 0.03-22 14:27:34.070 18806-18806/com.example.noamm_000.talkwithcompviawifi I/Timeline: Timeline: Activity_IDle ID: androID.os.BinderProxy@13c07070 time:33114368303-22 14:27:34.317 18806-19155/com.example.noamm_000.talkwithcompviawifi I/CameraDeviceState: Legacy camera service Transitioning to state CAPTURING03-22 14:27:34.353 18806-19149/com.example.noamm_000.talkwithcompviawifi I/CameraDeviceState: Legacy camera service Transitioning to state IDLE03-22 14:27:34.403 18806-18806/com.example.noamm_000.talkwithcompviawifi D/BubblePopupHelper: isShowingBubblePopup : false03-22 14:27:34.403 18806-18806/com.example.noamm_000.talkwithcompviawifi D/BubblePopupHelper: isShowingBubblePopup : false03-22 14:27:34.404 18806-18806/com.example.noamm_000.talkwithcompviawifi D/BubblePopupHelper: isShowingBubblePopup : false03-22 14:27:34.404 18806-18806/com.example.noamm_000.talkwithcompviawifi D/BubblePopupHelper: isShowingBubblePopup : false03-22 14:28:07.684 18806-18823/com.example.noamm_000.talkwithcompviawifi E/BufferQueueProducer: [unnamed-18806-1] cancelBuffer: BufferQueue has been abandoned03-22 14:28:07.684 18806-18822/com.example.noamm_000.talkwithcompviawifi E/BufferQueueProducer: [unnamed-18806-1] cancelBuffer: BufferQueue has been abandoned03-22 14:28:07.684 18806-19184/com.example.noamm_000.talkwithcompviawifi E/BufferQueueProducer: [unnamed-18806-1] cancelBuffer: BufferQueue has been abandoned03-22 14:28:07.685 18806-18823/com.example.noamm_000.talkwithcompviawifi E/BufferQueueProducer: [unnamed-18806-1] cancelBuffer: BufferQueue has been abandoned03-22 14:28:07.685 18806-18822/com.example.noamm_000.talkwithcompviawifi E/BufferQueueProducer: [unnamed-18806-1] cancelBuffer: BufferQueue has been abandoned03-22 14:28:07.685 18806-19184/com.example.noamm_000.talkwithcompviawifi E/BufferQueueProducer: [unnamed-18806-1] cancelBuffer: BufferQueue has been abandoned03-22 14:28:07.686 18806-18823/com.example.noamm_000.talkwithcompviawifi E/BufferQueueProducer: [unnamed-18806-1] cancelBuffer: BufferQueue has been abandoned03-22 14:28:07.686 18806-18822/com.example.noamm_000.talkwithcompviawifi E/BufferQueueProducer: [unnamed-18806-1] cancelBuffer: BufferQueue has been abandoned

谢谢,
诺姆

解决方法:

尝试这种方式更好地在后台线程中处理它.

 public voID onImageAvailable(ImageReader reader) {        new ImageSaver(reader.acquireLatestimage());    }    private class ImageSaver implements Runnable {        private final Image mImage;        public ImageSaver(Image image) {            mImage = image;        }        @OverrIDe        public voID run() {            file mImagefilename = null;            if (mImage != null) {                ByteBuffer byteBuffer = mImage.getPlanes()[0].getBuffer();                byte[] bytes = new byte[byteBuffer.remaining()];                byteBuffer.get(bytes);                fileOutputStream fileOutputStream = null;                try {                    mImagefilename = createImagefilename();                    fileOutputStream = new fileOutputStream(mImagefilename);                    fileOutputStream.write(bytes);                } catch (IOException e) {                    e.printstacktrace();                } finally {                    mImage.close();                    if (mImagefilename != null) {                        Intent mediaStoreUpdateIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_file);                        mediaStoreUpdateIntent.setData(Uri.fromfile(mImagefilename));                        sendbroadcast(mediaStoreUpdateIntent);                        loadImageFromStorage(mImagefilename);                    }                    if (fileOutputStream != null) {                        try {                            fileOutputStream.close();                        } catch (IOException e) {                            e.printstacktrace();                        }                    }                }            }        }        private voID loadImageFromStorage(file mImagefilename) {            imageVIEw.setimageBitmap(BitmapFactory.decodefile(mImagefilename.getabsolutePath()));        }    }    private file createImagefilename() throws IOException {        String timestamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());        String prepend = "IMAGE_" + timestamp + "_";        file imagefile = file.createTempfile(prepend, ".jpg", createImageFolder());        return imagefile;    }    private file createImageFolder() {        file imagefile = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);        file mImageFolder = new file(imagefile, "myFolder");        if (!mImageFolder.exists()) {            mImageFolder.mkdirs();        }        return mImageFolder;    }

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