private static final String COURIER_SEND_FILENAME = "curier.jpg";

    private static int TAKE_PICTURE = 1;
    private File file;
    private Uri outputFileUri;
    private String mCurrentPhotoPath;

    private ImageView mImageView;
...

    @Override
    protected void onCreate(Bundle savedInstanceState) {
         /*...*/
        mImageView = (ImageView) findViewById(R.id.photoImageView);

        file = new File(Environment.getExternalStorageDirectory(), COURIER_SEND_FILENAME);
        outputFileUri = Uri.fromFile(file);

        mCurrentPhotoPath = outputFileUri.getPath();
    }

   /*здесь запускаю камеру*/
    private void saveFullImage() {
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
        startActivityForResult(intent, TAKE_PICTURE);
    }
...

    @Override
    protected void onActivityResult(int requestCode,
                                    int resultCode, Intent data) {
       /*...*/
       
       showPhoto() //отображаю фото в ImageView используя mCurrentPhotoPath

       /*...*/

       if (file.delete()) {
          /*сюда попадаю*/
          Toast.makeText(getApplicationContext(), "Файл удален.", Toast.LENGTH_LONG).show();
       } else {
          Toast.makeText(getApplicationContext(), "Файл не удален!", Toast.LENGTH_LONG).show();
       }
    }