Allows RecyclerView work like a FlowLayout.

MyActivity.java

public class MyActivity extends Activity {
 
 public void onCreate(...){
   RecyclerView rv = findViewByIdCast(R.id.rv);
   // 2 is the number of columns 
   rv.setLayoutManager(new GridLayoutManager(this, 2)); 
   // Calculates the width of the "CardView" dynamically.
   int cardViewWidth = getResources().getDimension(R.dimen.my_cardview_width) + getResources().getDimension(R.dimen.my_cardview_margin) * 2;
   rv.getViewTreeObserver().addOnGlobalLayoutListener(new OnFlowLayoutListener(rv, cardViewWidth));
 }
  
}

OnFlowLayoutListener.java

import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.ViewTreeObserver;

/**
 * Allows RecyclerView work like a FlowLayout.
 *
 * Created by douglas on 16/09/15.
 */
public class OnFlowLayoutListener implements ViewTreeObserver.OnGlobalLayoutListener {

    private final RecyclerView recyclerView;
    private final float cardViewWidth;

    public OnFlowLayoutListener(RecyclerView recyclerView, float cardViewWidth) {
        this.recyclerView = recyclerView;
        this.cardViewWidth = cardViewWidth;
    }

    @Override
    public void onGlobalLayout() {
      //  recyclerView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
        int viewWidth = recyclerView.getMeasuredWidth();
        int newSpanCount = (int) Math.floor(viewWidth / cardViewWidth);
        if (newSpanCount > 0 && newSpanCount != ((GridLayoutManager) recyclerView.getLayoutManager()).getSpanCount()) {
            ((GridLayoutManager) recyclerView.getLayoutManager()).setSpanCount(newSpanCount);
            recyclerView.requestLayout();
            //recyclerView.getViewTreeObserver().addOnGlobalLayoutListener(this);
        }
    }
}