MyAdapter.java

package com.example.barnes.ummo;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.github.ivbaranov.mli.MaterialLetterIcon;

import java.util.Random;

/**
 * Created by barnes on 1/10/16.
 */
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>
{
    private static final int TYPE_HEADER = 0;  // Declaring Variable to Understand which View is being worked on
    // IF the view under inflation and population is header or Item
    private static final int TYPE_ITEM = 1;
    private String mNavTitles[]; // String Array to store the passed titles Value from MainActivity.java
    private int mIcons[];       // Int Array to store the passed icons resource value from MainActivity.java
    private String name;        //String Resource for header View Name
    private int profile;        //int Resource for header view profile picture
    private String email;       //String Resource for header view email
    int[] mMaterialColors;
    Random RANDOM = new Random();
    Context cont;

    //iconView.setIconText(context.getResources().getString(value.icon));

    // Creating a ViewHolder which extends the RecyclerView View Holder
    // ViewHolder are used to to store the inflated views in order to recycle them

    public static class ViewHolder extends RecyclerView.ViewHolder
    {
        int Holderid;
        TextView textView;
        ImageView imageView;
        MaterialLetterIcon profile;
        TextView Name;
        TextView email;
        MaterialLetterIcon mIcon;

        public ViewHolder(View itemView,int ViewType)
        {
            //Creating ViewHolder Constructor with View and viewType As a parameter
            super(itemView);
            //Here we set the appropriate view in accordance with the the view type as passed when the holder object is created
            if(ViewType == TYPE_ITEM)
            {
                textView = (TextView) itemView.findViewById(R.id.rowText); // Creating TextView object with the id of textView from item_row.xml
                imageView = (ImageView) itemView.findViewById(R.id.rowIcon);// Creating ImageView object with the id of ImageView from item_row.xml
                //mIcon = (ImageView) itemView.findViewById(R.id.rowIcon);
                Holderid = 1;                                               // setting holder id as 1 as the object being populated are of type item row
            }
            else
            {
                Name = (TextView) itemView.findViewById(R.id.name);         // Creating Text View object from header.xml for name
                email = (TextView) itemView.findViewById(R.id.email);       // Creating Text View object from header.xml for email
                profile = (MaterialLetterIcon) itemView.findViewById(R.id.circleView);// Creating Image view object from header.xml for profile pic
                Holderid = 0;                                                // Setting holder id = 0 as the object being populated are of type header view
            }
        }
    }

    public MyAdapter(String Titles[], int Icons[], String Name, String Email, int Profile, Context context)
    {
        // MyAdapter Constructor with titles and icons parameter
        // titles, icons, name, email, profile pic are passed from the main activity as we
        mNavTitles = Titles;                //have seen earlier
        mIcons = Icons;
        name = Name;
        email = Email;
        profile = Profile;
        cont = context;//here we assign those passed values to the values we declared here
        //in adapter
    }
    //Below first we ovverride the method onCreateViewHolder which is called when the ViewHolder is
    //Created, In this method we inflate the item_row.xml layout if the viewType is Type_ITEM or else we inflate header.xml
    // if the viewType is TYPE_HEADER
    // and pass it to the view holder
    @Override
    public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
    {
        if (viewType == TYPE_ITEM)
        {
            View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_row,parent,false); //Inflating the layout
            ViewHolder vhItem = new ViewHolder(v,viewType); //Creating ViewHolder and passing the object of type view
            mMaterialColors = cont.getResources().getIntArray(R.array.colors);
            return vhItem; // Returning the created object
            //inflate your layout and pass it to view holder
        } else if (viewType == TYPE_HEADER)
        {
            View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.header,parent,false); //Inflating the layout
            ViewHolder vhHeader = new ViewHolder(v,viewType); //Creating ViewHolder and passing the object of type view
            mMaterialColors = cont.getResources().getIntArray(R.array.colors);
            return vhHeader; //returning the object created
        }
        return null;
    }
    //Next we override a method which is called when the item in a row is needed to be displayed, here the int position
    //Tells us item at which position is being constructed to be displayed and the holder id of the holder object tell us
    //which view type is being created 1 for item row
    @Override
    public void onBindViewHolder(MyAdapter.ViewHolder holder, int position)
    {
        if(holder.Holderid ==1)
        {                              // as the list view is going to be called after the header view so we decrement the
            // position by 1 and pass it to the holder while setting the text and image
            holder.textView.setText(mNavTitles[position - 1]); // Setting the Text with the array of our Titles
            holder.imageView.setImageResource(mIcons[position - 1]);// Settimg the image with array of our icons
        }
        else
        {
            //holder.profile.setI(profile);           // Similarly we set the resources for header view
            holder.profile.setShapeColor(mMaterialColors[RANDOM.nextInt(mMaterialColors.length)]);
            holder.profile.setInitials(true);
            holder.profile.setInitialsNumber(2);
            holder.profile.setLetterSize(18);
            holder.profile.setLetter(name);
            holder.Name.setText(name);
            holder.email.setText(email);
        }
    }

    // This method returns the number of items present in the list
    @Override
    public int getItemCount()
    {
        return mNavTitles.length+1; // the number of items in the list will be +1 the titles including the header view.
    }

    // Witht the following method we check what type of view is being passed
    @Override
    public int getItemViewType(int position)
    {
        if (isPositionHeader(position))
            return TYPE_HEADER;
        return TYPE_ITEM;
    }

    private boolean isPositionHeader(int position)
    {
        return position == 0;
    }
}