Android for ever: RecyclerView + CardView example with ImageView

Last post show how to "get all available drawable and its value". This example show how to display the drawables, names and values in RecyclerView + CardView.

To use RecyclerView + CardView, we have to "Add Support Libraries of RecyclerView, CardView to Android Studio Project".

Create layout of the CardView, layout/layout_cardview.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="10dp"
    card_view:cardCornerRadius="20sp"
    card_view:cardElevation="5sp">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <ImageView
            android:id="@+id/item_image"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <TextView
            android:id="@+id/item_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="18dp"/>
        <TextView
            android:id="@+id/item_value"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="16dp"/>

    </LinearLayout>

</android.support.v7.widget.CardView>

Create our custom MyRecyclerViewAdapter extends RecyclerView.Adapter, com.example.androidlistdrawable.MyRecyclerViewAdapter.java

package com.example.androidlistdrawable;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.CardView;
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 java.util.ArrayList;
import java.util.List;

public class MyRecyclerViewAdapter extends
        RecyclerView.Adapter<MyRecyclerViewAdapter.ItemHolder> {

    private List<String> itemsName;
    private List<Integer> itemsValue;
    private LayoutInflater layoutInflater;
    private Context context;

    public MyRecyclerViewAdapter(Context context){
        this.context = context;
        layoutInflater = LayoutInflater.from(context);
        itemsName = new ArrayList<String>();
        itemsValue = new ArrayList<Integer>();
    }

    @Override
    public MyRecyclerViewAdapter.ItemHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        CardView itemCardView = (CardView)layoutInflater.inflate(R.layout.layout_cardview, viewGroup, false);
        return new ItemHolder(itemCardView, this);
    }

    @Override
    public void onBindViewHolder(MyRecyclerViewAdapter.ItemHolder itemHolder, int i) {
        itemHolder.setItemName(itemsName.get(i));
        int value = itemsValue.get(i);
        itemHolder.setItemValue(String.valueOf(value));
        Drawable drawable = context.getResources().getDrawable(value);
        itemHolder.setImageView(drawable);
    }

    @Override
    public int getItemCount() {
        return itemsName.size();
    }

    public void add(int location, String iName, int iValue){
        itemsName.add(location, iName);
        itemsValue.add(location, iValue);
        notifyItemInserted(location);
    }

    public void remove(int location){
        if(location >= itemsName.size())
            return;

        itemsName.remove(location);
        itemsValue.remove(location);
        notifyItemRemoved(location);
    }

    public static class ItemHolder extends RecyclerView.ViewHolder{

        private MyRecyclerViewAdapter parent;
        private CardView cardView;
        TextView textItemName;
        TextView textItemValue;
        ImageView imageView;

        public ItemHolder(CardView cView, MyRecyclerViewAdapter parent) {
            super(cView);
            cardView = cView;
            this.parent = parent;
            textItemName = (TextView) cardView.findViewById(R.id.item_name);
            textItemValue = (TextView) cardView.findViewById(R.id.item_value);
            imageView = (ImageView) cardView.findViewById(R.id.item_image);
        }

        public void setItemName(CharSequence name){
            textItemName.setText(name);
        }

        public CharSequence getItemName(){
            return textItemName.getText();
        }

        public void setItemValue(CharSequence val){
            textItemValue.setText(val);
        }

        public CharSequence getItemValue(){
            return textItemValue.getText();
        }

        public void setImageView(Drawable drawable){
            imageView.setImageDrawable(drawable);
        }

    }
}

Modify layout to add RecyclerView, layout/activity_main.xml.

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />

    <android.support.v7.widget.RecyclerView
        android:id="@+id/myrecyclerview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</LinearLayout>

com.example.androidlistdrawable.MainActivity.java

package com.example.androidlistdrawable;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;

import java.lang.reflect.Field;

public class MainActivity extends AppCompatActivity {

    private RecyclerView myRecyclerView;
    private StaggeredGridLayoutManager staggeredGridLayoutManagerVertical;
    private MyRecyclerViewAdapter myRecyclerViewAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        myRecyclerView = (RecyclerView)findViewById(R.id.myrecyclerview);

        staggeredGridLayoutManagerVertical =
                new StaggeredGridLayoutManager(
                        2, //The number of Columns in the grid
                        LinearLayoutManager.VERTICAL);
        myRecyclerViewAdapter = new MyRecyclerViewAdapter(this);
        myRecyclerView.setAdapter(myRecyclerViewAdapter);
        myRecyclerView.setLayoutManager(staggeredGridLayoutManagerVertical);

        prepareItems();
    }

    private void prepareItems(){
        Field[] fieldDrawables = android.R.drawable.class.getFields();
        for(int i=0; i<fieldDrawables.length; i++){
            Field field = fieldDrawables[i];
            try {
                int value = (int) field.get(fieldDrawables);
                myRecyclerViewAdapter.add(
                        myRecyclerViewAdapter.getItemCount(),
                        "R.drawable." + field.getName(),
                        value);
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }

        }
    }

}