android - 为什么文件存在声明在android中不正确？

Question

我正在处理电子邮件附件。附件时我遇到了一个问题。问题是我想发送一封带附件的邮件。我在这条路径上有一个文件 sdcard0，然后是 fgg，然后是 hh.html。当我调试时在这个 File file = new File(attachments.getString(i));它显示 file:/storage/sdcard0/fgg/hh.html但是在此之后它不去 if 条件为什么？

File file = new File(attachments.getString(i));
                        if (file.exists()) {
                            Uri uri = Uri.fromFile(file);
                            uris.add(uri);
                        }

这是我的代码

JSONArray attachments = parameters.getJSONArray("attachments");
        if (attachments != null && attachments.length() > 0) {
            ArrayList<Uri> uris = new ArrayList<Uri>();
            //convert from paths to Android friendly Parcelable Uri's
            for (int i=0; i<attachments.length(); i++) {
                try {
                    File file = new File(attachments.getString(i));
                    if (file.exists()) {
                        Uri uri = Uri.fromFile(file);
                        uris.add(uri);
                    }
                } catch (Exception e) {
                    LOG.e("EmailComposer", "Error adding an attachment: " + e.toString());
                }
            }
            if (uris.size() > 0) {
                emailIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
            }
        }
    } catch (Exception e) {
        LOG.e("EmailComposer", "Error handling attachments param: " + e.toString());
    }

Answer 1

文件的 Uri 需要三个斜线:

file:///storage/sdcard0/fgg/hh.html

如你所见here .但我可能无法正常工作，因此请尝试删除字符串的“文件:”部分:

File file = new File(attachments.getString(i).replace("file:","");