The photo lose its quality when it appears into the ImageView

问题

excuse me for any grammatical errors.

I made an application that allow you to take a picture and after you clicked "Ok", the picture appear in an ImageView. Now, I don't know why, when I try this application on my Nexus 5X, the photo lose the quality when it appears into the ImageView. Application image (Image View): Camera Image:

Fragment Code:

public class CameraFragment extends Fragment{

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    dispatchTakePictureIntent();
    return inflater.inflate(R.layout.fragment_camera,container,false);
}

ImageView SkimmedImageImg;
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    SkimmedImageImg = (ImageView)view.findViewById(R.id.SkimmedImg);
}

static final int REQUEST_IMAGE_CAPTURE = 1;

private void dispatchTakePictureIntent() {
    Fragment CameraFragment = this;
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    CameraFragment.startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data){
    super.onActivityResult(requestCode, resultCode, data);

    if(resultCode == Activity.RESULT_OK){
        if(requestCode == REQUEST_IMAGE_CAPTURE){
            Bitmap SkimmedImgData = (Bitmap) data.getExtras().get("data");
            SkimmedImageImg.setImageBitmap(SkimmedImgData);
        }
    }
}

}

回答1:

Just copy paste the whole class:

public class CameraFragment extends android.support.v4.app.Fragment{   

    String mCurrentPhotoPath;
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        final int MyVersion = Build.VERSION.SDK_INT;
        if (MyVersion > Build.VERSION_CODES.LOLLIPOP_MR1) {
            if (!checkIfAlreadyhavePermission_new()) {
                requestPermissions(new String[]{Manifest.permission.CAMERA}, 1);
            } else {
                if (!checkIfAlreadyhavePermission()) {
                    requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 2);
                } else {
                    try {
                        dispatchTakePictureIntent();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        } else {
            try {
                dispatchTakePictureIntent();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        return inflater.inflate(R.layout.fragment_camera,container,false);
    }

    ImageView SkimmedImageImg;
    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        SkimmedImageImg = (ImageView)view.findViewById(R.id.SkimmedImg);
    }

    static final int REQUEST_IMAGE_CAPTURE = 1;

    private void dispatchTakePictureIntent() throws IOException {
        CameraFragment cameraFragment = this;
        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        // Ensure that there's a camera activity to handle the intent
        if (takePictureIntent.resolveActivity(getActivity().getPackageManager()) != null) {
            // Create the File where the photo should go
            File photoFile = null;
            try {
                photoFile = createImageFile();
            } catch (IOException ex) {
                // Error occurred while creating the File
                return;
            }
            // Continue only if the File was successfully created
            if (photoFile != null) {
                Uri photoURI = FileProvider.getUriForFile(getActivity(),
                        BuildConfig.APPLICATION_ID + ".provider",
                        createImageFile());;
                takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
                cameraFragment.startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
            }
        }

    }

    private boolean checkIfAlreadyhavePermission() {
        int result = ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.READ_EXTERNAL_STORAGE);
        return result == PackageManager.PERMISSION_GRANTED;
    }

    private boolean checkIfAlreadyhavePermission_new() {
        int result = ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.CAMERA);
        return result == PackageManager.PERMISSION_GRANTED;
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (resultCode == Activity.RESULT_OK) {
            if (requestCode == REQUEST_IMAGE_CAPTURE) {
                Uri imageUri = Uri.parse(mCurrentPhotoPath);
                File file = new File(imageUri.getPath());
                Glide.with(getActivity())
                     .load(file)
                     .into(SkimmedImageImg);

                // ScanFile so it will be appeared on Gallery
                MediaScannerConnection.scanFile(getActivity(),
                        new String[]{imageUri.getPath()}, null,
                        new MediaScannerConnection.OnScanCompletedListener() {
                            public void onScanCompleted(String path, Uri uri) {
                            }
                        });
            }
        }

    }

    private File createImageFile() throws IOException {
        // Create an image file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "JPEG_" + timeStamp + "_";
        File storageDir = new File(Environment.getExternalStoragePublicDirectory(
                Environment.DIRECTORY_DCIM), "Camera");
        File image = File.createTempFile(
                imageFileName,  /* prefix */
                ".jpg",         /* suffix */
                storageDir      /* directory */
        );

        // Save a file: path for use with ACTION_VIEW intents
        mCurrentPhotoPath = "file:" + image.getAbsolutePath();
        return image;
    }


    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
        switch (requestCode) {
            case 1: {
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    if (!checkIfAlreadyhavePermission()) {
                        requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 2);
                    } else {
                        try {
                            dispatchTakePictureIntent();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                } else {
                    Toast.makeText(getActivity(), "NEED CAMERA PERMISSION", Toast.LENGTH_LONG).show();
                }
                break;
            }

            case 2: {
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    try {
                        dispatchTakePictureIntent();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                } else {
                    Toast.makeText(getActivity(), "NEED STORAGE PERMISSION", Toast.LENGTH_LONG).show();
                }
                break;
            }
            // other 'case' lines to check for other
            // permissions this app might request
        }
    }

}

If you are getting error while Fragment loading in MainActivity, just use getSupportFragmentManager():

 FragmentManager fm = getSupportFragmentManager();

回答2:

When you call Bitmap SkimmedImgData = (Bitmap) data.getExtras().get("data");, and then set the image using SkimmedImageImg.setImageBitmap(SkimmedImgData);, you're only setting the thumbnail of the image you took, this is why the quality is so distorted. You can follow this tutorial, which will show you how to save the full size image, look under the header Save the Full-size Photo.

来源：https://stackoverflow.com/questions/42330052/the-photo-lose-its-quality-when-it-appears-into-the-imageview