Changing number of columns in RecyclerView gridlayout

Question

I am trying to change the number of columns that appear in the recycler view (grid layout) based on the display size. However I couldn\'t figure out a proper way of achievin

Answer 1

If you provide a fixed column width, you can extend RecyclerView and set the span count in onMeasure accordingly:

public AutofitRecyclerView(Context context, AttributeSet attrs) {
  super(context, attrs);

  if (attrs != null) {
    // Read android:columnWidth from xml
    int[] attrsArray = {
        android.R.attr.columnWidth
    };
    TypedArray array = context.obtainStyledAttributes(attrs, attrsArray);
    columnWidth = array.getDimensionPixelSize(0, -1);
    array.recycle();
  }

  manager = new GridLayoutManager(getContext(), 1);
  setLayoutManager(manager);
}

protected void onMeasure(int widthSpec, int heightSpec) {
  super.onMeasure(widthSpec, heightSpec);
  if (columnWidth > 0) {
    int spanCount = Math.max(1, getMeasuredWidth() / columnWidth);
    manager.setSpanCount(spanCount);
  }
}

See my blog post for more info: http://blog.sqisland.com/2014/12/recyclerview-autofit-grid.html