public static String getPath(final Context context, final Uri uri) {



        final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;



        // DocumentProvider

        if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {

            // ExternalStorageProvider

            if (isExternalStorageDocument(uri)) {

                final String docId = DocumentsContract.getDocumentId(uri);

                final String[] split = docId.split(":");

                final String type = split[0];



                if ("primary".equalsIgnoreCase(type)) {

                    return Environment.getExternalStorageDirectory() + "/" + split[1];

                }



                // TODO handle non-primary volumes

            }

            // DownloadsProvider

            else if (isDownloadsDocument(uri)) {



                final String id = DocumentsContract.getDocumentId(uri);

                final Uri contentUri = ContentUris.withAppendedId(

                        Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));



                return getDataColumn(context, contentUri, null, null);

            }

            // MediaProvider

            else if (isMediaDocument(uri)) {

                final String docId = DocumentsContract.getDocumentId(uri);

                final String[] split = docId.split(":");

                final String type = split[0];



                Uri contentUri = null;

                if ("image".equals(type)) {

                    contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;

                } else if ("video".equals(type)) {

                    contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;

                } else if ("audio".equals(type)) {

                    contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;

                }



                final String selection = "_id=?";

                final String[] selectionArgs = new String[] {

                        split[1]

                };



                return getDataColumn(context, contentUri, selection, selectionArgs);

            }

        }

        // MediaStore (and general)

        else if ("content".equalsIgnoreCase(uri.getScheme())) {

            return getDataColumn(context, uri, null, null);

        }

        // File

        else if ("file".equalsIgnoreCase(uri.getScheme())) {

            return uri.getPath();

        }



        return null;

    }
Get a file path from a Uri. This will get the the path for Storage Access
Framework Documents, as well as the _data field for the MediaStore and
other file-based ContentProviders.

@param context The context.
@param uri The Uri to query.
@author paulburke
app/src/main/java/com/zhao/myreader/util/UriFileUtil.java