LinearLayoutManager implementation that stretches to fit all list items on screen and disables scrolling. Useful for dashboards etc.

LICENSE

MIT License

Copyright (c) 2020 Jan Heinrich Reimer

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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SOFTWARE.

SpanningLinearLayoutManager.java

package de.wilhelmgym.quiz.recyclerview;

import android.content.Context;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.view.ViewGroup;

public class SpanningLinearLayoutManager extends LinearLayoutManager {

    public SpanningLinearLayoutManager(Context context) {
        super(context);
    }

    public SpanningLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {
        super(context, orientation, reverseLayout);
    }

    public SpanningLinearLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    public RecyclerView.LayoutParams generateDefaultLayoutParams() {
        return spanLayoutSize(super.generateDefaultLayoutParams());
    }

    @Override
    public RecyclerView.LayoutParams generateLayoutParams(Context c, AttributeSet attrs) {
        return spanLayoutSize(super.generateLayoutParams(c, attrs));
    }

    @Override
    public RecyclerView.LayoutParams generateLayoutParams(ViewGroup.LayoutParams lp) {
        return spanLayoutSize(super.generateLayoutParams(lp));
    }

    @Override
    public boolean checkLayoutParams(RecyclerView.LayoutParams lp) {
        return super.checkLayoutParams(lp);
    }

    private RecyclerView.LayoutParams spanLayoutSize(RecyclerView.LayoutParams layoutParams){
        if(getOrientation() == HORIZONTAL){
            layoutParams.width = (int) Math.round(getHorizontalSpace() / (double) getItemCount());
        }
        else if(getOrientation() == VERTICAL){
            layoutParams.height = (int) Math.round(getVerticalSpace() /  (double) getItemCount());
        }
        return layoutParams;
    }

    @Override
    public boolean canScrollVertically() {
        return false;
    }
    @Override
    public boolean canScrollHorizontally() {
        return false;
    }

    private int getHorizontalSpace() {
        return getWidth() - getPaddingRight() - getPaddingLeft();
    }

    private int getVerticalSpace() {
        return getHeight() - getPaddingBottom() - getPaddingTop();
    }
}

@Miha-x64 your version is amazing!

@jtrollkarl as I said in my previous comment, items with self-determined width/height would make no sense in conjunction with this layout manager. Use a standard LinearLayoutManager instead.

@heinrichreimer how can I make this scrollable. I have around 10 items. Currently they are really close to each other.

@SAGARSURI You shouldn't use this or @miha-x86's layout manager for scrollable lists. It is intended only for lists that should fit on one page, as stated in the Gist description.

Horizontal recycler view is not scrolling

@rajeshdeva23 You shouldn't use this layout manager for scrollable lists. It is intended only for lists that should fit on one page, as stated in the Gist description.

This saved my life ... Thanks you so much.

Hi this is great!

But I want to use it only when my all items width is less than the screen width. Otherwise, I want my items to be scrollable.

Is there a way to achieve this?

@mianaliasjad I would just change the layout manager based on the screen width. That should be easier than to write two layout managers at once.