Scrolling based txt ebook reader

I'm hiring a android app developer to develop my ebook reader android app. The main function of this app is displaying text on the screen as ebook readers does. Different features of this reader from other normal ebook reader is, this reader displays text by scrolling from right to left on the screen and the user can control the speed of the scrolling. The main action screen consists of three parts. The first part is menu part, the second part is text viewing part, and the last part is user control part. In the 'menu' part, few menus for basic ebook reader functions, such as open, bookmark, jump to, setting, and help. If the 'open' menu is selected, a file selection window is pop up and the user can select a text file. Currently, it can open only non-DRM text based files are supported, such as txt, html, epub, etc. If the 'bookmark is selected, a list of book marks is pop up and the user can select a bookmark to jump to. The 'jump to' menu provides to way to jump to specific line of the book. If the 'setting' is selected, a setting window is pop up. in the setting window the user can change the font, size of the text and colors, etc. Top right corner of the screen is the place the user touch there to add a bookmark of current position. In the 'viewing' part, there are three text scrolling lines. the line in the middle is the main viewing focused text line that scrolls the current text line. Above and below of it, there are also scrolling lines which are 'passed line' and 'coming line' respectively. There two lines are just to visualize the context of current focused line and are shaded little so the focused line in the middle be highlighted. these two auxiliary lines can be hidden by touch the area. In the 'control' part, several control buttons and sliding bars are located. Detailed plan and explanation of control parts are explained in the image ppt file attached below. Most important contol interface is the speed control by which the user can control the speed and direction of scrolling. There would be a splash image which will show the company name, "teheran learning" and a logo image at the moment of starting the app. The image art will be replaced later so just put any image for now. When the app is started, is resume showing the last position of the ebook. When the user touch the top right corner of the screen a bookmark ribbon is shown and the bookmark menu is shown. However, only paid version provides bookmarking capability, thus it show a proper message and provide a guiding link to the google store where the paid version is. Detailed requirements can be added or changed during development. Deliverables: Fully compilable android studio source code for free version and paid version. All images and resource files.