Calculating LRU limit for different devices (as suggested by guide)

LRUCalculator.java

public LRUCalculator{
  
  public static int getMemorySize(Context context){
    int memClass = ( ( ActivityManager )context.getSystemService( Context.ACTIVITY_SERVICE ) ).getMemoryClass();
    int cacheSize = 1024 * 1024 * memClass / 8;
    return cacheSize;
  }
  
  
  
}