uniappx 文件读写操作

getUriColumn(uri : Uri, selection : string, selectionArgs : string[]) {  
                const column : string = "_data";  
                const context = UTSAndroid.getAppContext() as Context;  
                const resolver = context.getContentResolver();  
                const cursor = resolver.query(uri, [column], selection, selectionArgs, "");  
                try {  
                    if (cursor != null && cursor.moveToFirst()) {  
                        const cursorIndex = cursor.getColumnIndexOrThrow(column);  
                        const str = cursor.getString(cursorIndex);  
                        console.log(str)  
                    }  
                }  
                catch (e) {  

                }  
                finally {  
                    if (cursor != null)  
                        cursor.close()  
                }  
            }