CarlosMChica

  
//Looks like drawable is still not ready to be set when applying it to the action bar 
//in versions bellow 17 with default method. The action bar needs to be redrawed and it can be forced by using     
//the following workarround 
public void setActionBarbackground(ColorDrawable colorDrawable) {
        ActionBar actionBar = getActionBar();
	if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR1) {
  		actionBar.setBackgroundDrawable(colorDrawable);
          	//switch true/false values if title is not needed
		actionBar.setDisplayShowTitleEnabled(false);

CarlosMChica

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.annotation.DimenRes;
import android.support.annotation.DrawableRes;
import android.support.v7.widget.RecyclerView;
import android.view.View;

CarlosMChica

Dev tip: how to animate transition between placeholder and image.

//Create a bitmap drawable from the bitmap to be shown
Drawable bitmapDrawable = new BitmapDrawable(context,bitmap);

Drawable[] layers = new Drawable[] {
         imageView.getDrawable(), //Current placeholder
         bitmapDrawable  //Image to show
 };

CarlosMChica

class FizzBuzz {

  private val fizzes = cycle("", "", "Fizz")
  private val buzzes = cycle("", "", "", "", "Buzz")
  private val fizzBuzzes = fizzes.zip(buzzes).map(x => x._1 ++ x._2)
  private lazy val fizzBuzz = fizzBuzzes.zip(Stream.from(1)).map(x => if (x._1.isEmpty) x._2.toString else x._1)

  def convert(x: Int): String = {
    convert(1 to x)(x - 1)
  }

CarlosMChica

mostPopularLetterWithCount :: String -> (Char, Int)
mostPopularLetterWithCount xs =
  swap . maximum . fmap swap . Map.toList . Map.fromListWith (+) $ [(x, 1) | x <- xs, not . isSpace $ x]

mostPopularWordWithCount :: String -> (String, Int)
mostPopularWordWithCount xs =
  swap . maximum . fmap swap . Map.toList . Map.fromListWith (+) $ [(x, 1) | x <- words xs]