java - 从Uri类型的android创建文件

我正在尝试从图库中选择图像，然后将此图像转换为File并通过HttpPost发送，但是我总是得到FileNotFoundException。这是我的代码:

选择照片

public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == Activity.RESULT_OK) {
            if (requestCode == 1) {
                // currImageURI is the global variable I’m using to hold the content:
                currImageURI = data.getData();
                //Save the currImageUri (URI type) to global variable.
                photosHolder.getInstance().setOneIm(currImageURI);
            }
        }
    }

转换照片

                // First Try
                File myFile = new File((photosHolder.getInstance().getOneIm()).toString());
                params.put("visit_report[photos_attributes][0][file]",myFile); **The exception Raised here
// second try
                File myFile2 = new File((photosHolder.getInstance().getOneIm()).getPath());
                params.put("visit_report[photos_attributes][1][file]",myFile2); ** Also here

这些是myFiles在调试时的值:

mFile : content:/com.android.providers.media.documents/document/image%3A19143
myFile2 : /document/image:19143

有什么帮助吗？

更新
我也尝试过此解决方案:

//get The real path from uri then save it (and then use it to create the file)
photosHolder.getInstance().setUriString(getRealPathFromURI(currImageURI));

//Convert the image URI to the direct file system path of the image file
    private String getRealPathFromURI(Uri contentURI) {
        String result = "";
        try {
        Cursor cursor = getActivity().getContentResolver().query(contentURI, null, null, null, null);
        if (cursor == null) { // Source is Dropbox or other similar local file path
            result = contentURI.getPath();
        } else {
            cursor.moveToFirst();
            int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
            result = cursor.getString(idx); // Exception raised HERE
            cursor.close(); }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

但是我得到了java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it和idx var ==到-1
我也尝试了@Praneeth Kalluri解决方案，但结果始终返回null。

最佳答案

 Uri currImageURI = data.getData();

打印currImageURI将为您提供以下信息:

content://media/external/images/media/47

但是我们需要的是该特定图像的绝对路径。因此，我们需要从uri获取真实路径

public String getRealPathFromURI(Context context, Uri contentUri) {
  Cursor cursor = null;
  try {
    String[] proj = { MediaStore.Images.Media.DATA };
    cursor = context.getContentResolver().query(contentUri,  proj, null, null, null);
    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    return cursor.getString(column_index);
  } finally {
    if (cursor != null) {
      cursor.close();
    }
  }
}

现在修改您的代码，例如

public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == Activity.RESULT_OK) {
            if (requestCode == 1) {
                // currImageURI is the global variable I’m using to hold the content:
                currImageURI = data.getData();
                //Save the currImageUri (URI type) to global variable.
                photosHolder.getInstance().setOneIm(getRealPathFromURI(getActivity(),currImageURI));
            }
        }
    }

public String getRealPathFromURI(Context context, Uri contentUri) {
  Cursor cursor = null;
  try {
    String[] proj = { MediaStore.Images.Media.DATA };
    cursor = context.getContentResolver().query(contentUri,  proj, null, null, null);
    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    return cursor.getString(column_index);
  } finally {
    if (cursor != null) {
      cursor.close();
    }
  }
}