相关疑难解决方法(0)

为了清楚起见,我不是在寻找MIME类型.

假设我有以下输入: /path/to/file/foo.txt

我想要一种方法来打破这种输入,特别.txt是扩展.在Java中有没有内置的方法来做到这一点？我想避免编写自己的解析器.

我想得到从图库加载或从相机中拾取的图像的图像扩展名(例如"jpg","png","bmp"ecc.).

我已经使用此表单中的方法从库中加载图像

    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);
                    .........
                } …