Android:拍摄照片以使用WebService发送

Question

我想拍摄一些照片，完成后，将它们全部发送到Web服务上，而无需将它们保存在设备上。

我已经尝试在发送后删除它们，但没有成功。

最好的方法是什么？

这是我的图像捕获活动。

private ImageView imgPreview;
private Button btnCapturePicture;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.image_capture);
    context = getApplicationContext();
    imgPreview = (ImageView) findViewById(R.id.imgPreview);
    btnCapturePicture = (Button) findViewById(R.id.btnCapturePicture);
    /**
     * Capture image button click event
     * */
    btnCapturePicture.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // capture picture
            captureImage();
        }
    });
}

GPSTracker gps;
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // if the result is capturing Image
    if (requestCode == CAMERA_CAPTURE_IMAGE_REQUEST_CODE) {
        //TODO
        gps = new GPSTracker(ImageCaptureActivity.this);
        if (resultCode == RESULT_OK) {
            // successfully captured the image
            // display it in image view
            previewCapturedImage();
            //get gps location coordinates
            if(gps.canGetLocation())
            {
                double latitude = gps.getLatitude();
                double longitude = gps.getLongitude();
                Toast.makeText(getApplicationContext(), "Your Location is - nLat: " + latitude + "nLong: "
                        + longitude, Toast.LENGTH_LONG).show();
                //from latitude and longitude to address
                Geocoder gcd = new Geocoder(context, Locale.getDefault());
                List<Address> addresses = null;
                try {
                    addresses = gcd.getFromLocation(latitude, longitude, 1);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                if (addresses.size() > 0) {
                    String tara = addresses.get(0).getCountryName();
                    String judet = addresses.get(0).getLocality();
                    String oras = addresses.get(0).getSubLocality();
                    String adresa = addresses.get(0).getAddressLine(0);
                    System.out.println(tara + ", " + judet + ", " + oras + ", " + adresa + "n");
                }
            } else {
                // Can't get location.
                // GPS or network is not enabled.
                // Ask user to enable GPS/network in settings.
                Toast.makeText(getApplicationContext(), "Turn on GPS", Toast.LENGTH_LONG).show();
                Intent backIntent = new Intent(ImageCaptureActivity.this, Cont.class);
                startActivity(backIntent);
            }

            //TODO
            //GET DATE OF IMAGE
            String pathToFile = fileUri.getPath();
            File file = new File(pathToFile);
            if(file.exists()) {
                String date = new SimpleDateFormat("dd-MM-yyyy HH-mm-ss").format(
                        new Date(file.lastModified())
                );
                Toast.makeText(context, date, Toast.LENGTH_LONG)
                        .show();
            }

        } else if (resultCode == RESULT_CANCELED) {
            // user cancelled Image capture
            Toast.makeText(getApplicationContext(),
                    "Cancelled", Toast.LENGTH_SHORT)
                    .show();
        } else {
            // failed to capture image
            Toast.makeText(getApplicationContext(),
                    "Error!", Toast.LENGTH_SHORT)
                    .show();
        }
    }
}
@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    // save file url in bundle as it will be null on scren orientation
    // changes
    outState.putParcelable("file_uri", fileUri);
}
/*
 * Here we restore the fileUri again
 */
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    // get the file url
    fileUri = savedInstanceState.getParcelable("file_uri");
}

和辅助方法：

    private void captureImage() {
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
    intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
    // start the image capture Intent
    startActivityForResult(intent, CAMERA_CAPTURE_IMAGE_REQUEST_CODE);
}
/**
 * Creating file uri to store image/video
 */
public Uri getOutputMediaFileUri(int type) {
    return Uri.fromFile(getOutputMediaFile(type));
}
/*
 * returning image / video
 */
private static File getOutputMediaFile(int type) {
    // External sdcard location
    File mediaStorageDir = new File(
            Environment
                    .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
            IMAGE_DIRECTORY_NAME);
    // Create the storage directory if it does not exist
    if (!mediaStorageDir.exists()) {
        if (!mediaStorageDir.mkdirs()) {
            Log.d(IMAGE_DIRECTORY_NAME, "file"
                    + IMAGE_DIRECTORY_NAME + " was not created");
            return null;
        }
    }
    // Create a media file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
            Locale.getDefault()).format(new Date());
    File mediaFileName;
    if (type == MEDIA_TYPE_IMAGE) {
        mediaFileName = new File(mediaStorageDir.getPath() + File.separator
                + "IMG_" + timeStamp + ".jpg");
    } else {
        return null;
    }
    return mediaFileName;
}
/*
 * Display image from a path to ImageView
 */
private void previewCapturedImage() {
    try {
        imgPreview.setVisibility(View.VISIBLE);
        // bimatp factory
        BitmapFactory.Options options = new BitmapFactory.Options();
        // downsizing image as it throws OutOfMemory Exception for larger
        // images
        options.inSampleSize = 8;
        final Bitmap bitmap = BitmapFactory.decodeFile(fileUri.getPath(),
                options);
        imgPreview.setImageBitmap(bitmap);
    } catch (NullPointerException e) {
        e.printStackTrace();
    }
}

我想在 REST Web 服务上发送照片。

Answer 1

感谢您的编辑！

首先，保存图像并删除图像的方法是正确的，因为将图像保留在内存中不是一个好的做法。

其次，我假设您在Web服务器上运行了一个Web REST服务。因此，如果要上传图像，则必须使用正确的请求方法对服务器服务的端点进行HTTP调用。您可以在此处查看如何精确调用的更精确的代码示例。

最后，我建议您在前台服务中执行繁重的上传工作，这样您就可以确保操作系统不会在上传过程中杀死您的线程。