title: Get the file extension from images picked from gallery or camera, as string
body: <p>I want to get as string the image extension (for example "jpg", "png", "bmp" ecc.) of the images loaded from the gallery or picked from the camera.</p>
  
  <p>I have used a method in this form to load images from the gallery</p>
  
  <pre><code>    private static final int SELECT_PICTURE_ACTIVITY_REQUEST_CODE = 0;
  ....
  private void selectPicture() {
      Intent intent = new Intent(Intent.ACTION_PICK);
      intent.setType("image/*");
      startActivityForResult(intent, SELECT_PICTURE_ACTIVITY_REQUEST_CODE);
  }
  ....
  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) {
      super.onActivityResult(requestCode, resultCode, imageReturnedIntent);
  
      switch (requestCode) {
          case SELECT_PICTURE_ACTIVITY_REQUEST_CODE:
              if (resultCode == RESULT_OK) {
                  Uri selectedImage = imageReturnedIntent.getData();
                  String[] filePathColumn = {MediaStore.Images.Media.DATA};
                  Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
                  if (cursor.moveToFirst()) {
                      int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                      String filePath = cursor.getString(columnIndex);
                      Bitmap bitmap = BitmapFactory.decodeFile(filePath);
                      .........
                  }
                  cursor.close();
              }
              break;
      }
  }
  </code></pre>