图片Path转换为Uri的方法

//              根据Uri.fromFile(file)方法即可将path转为uri
                Uri sourceUri = Uri.fromFile(new File(mSelectPath.get(0)));
//               创建裁剪照片之后保存的路径，也是先用path--->file--->Uri
                String saveDir = Environment.getExternalStorageDirectory()
                        + "/crop";
                File dir = new File(saveDir);
                if (!dir.exists()) {
                    dir.mkdir();
                }
                Uri destinationUri = Uri.fromFile(new File(saveDir, "crop.jpg"));
                UCrop.of(sourceUri, destinationUri)
//                        .withAspectRatio(16, 9)
                        .withMaxResultSize(900, 900)
                        .start(MainActivity.this);