such a question, you need to do something like this: 
Ie a tree with thin lines, found in the library network but everything is not right. Which way to dig?
upward upward
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- I would dig in the direction of Material Design. As it seems to me, you can make it more beautiful in the form of tablets using CardView. Did similar in the application in comments. It looks very minimalist and beautiful. Plus you do not need any third-party libraries. - Arnis Shaykh
- @Arnis Shaykh I know, but it is necessary with lines - upward
- Then you can make your custom view. I do not think that somewhere you can find something similar. In essence, these are nested lines plus lines. - Arnis Shaykh
- @ Arnis Shaykh and what algorithm? lines how to draw something? in terms of submission, from object a to b - upward
- At the expense of lines not sure, you have to think. I made the submission account as follows: an object in the tree list stores a link to its parent to a higher level and its position at the current level. Thus, in terms of submission and navigation, everything works well for me. - Arnis Shaykh
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