Android-er: RecyclerView + CardView example - list system properties using System.getProperties()

Tuesday, September 1, 2015

RecyclerView + CardView example - list system properties using System.getProperties()

My former example show how to "Retrieve system properties using System.getProperties()", here we are going to list the Properties on RecyclerView + CardView, similar to another example "RecyclerView + CardView example with ImageView - list available Drawable".

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

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="5dp"
    card_view:cardCornerRadius="5sp"
    card_view:cardElevation="5sp">

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

        <TextView
            android:id="@+id/item_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="14dp" />

        <TextView
            android:id="@+id/item_value"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textStyle="bold"
            android:textSize="16dp" />

    </LinearLayout>

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

com.blogspot.android_er.androidproperties.MyRecyclerViewAdapter.java

package com.blogspot.android_er.androidproperties;

import android.content.Context;
import android.support.v7.widget.CardView;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.ViewGroup;
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<String> 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<String>();
    }

    @Override
    public 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(ItemHolder itemHolder, int i) {
        itemHolder.setItemName(itemsName.get(i));
        String value = itemsValue.get(i);
        itemHolder.setItemValue(String.valueOf(value));
    }

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

    public void add(int location, String iName, String 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;

        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);
        }

        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();
        }
    }
}

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:orientation="vertical"
    android:padding="16dp"
    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.blogspot.android_er.androidproperties.MainActivity.java

package com.blogspot.android_er.androidproperties;

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

import java.util.Enumeration;
import java.util.Properties;

public class MainActivity extends AppCompatActivity {

    private RecyclerView myRecyclerView;
    LinearLayoutManager linearLayoutManager;
    private MyRecyclerViewAdapter myRecyclerViewAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        myRecyclerView = (RecyclerView)findViewById(R.id.myrecyclerview);

        linearLayoutManager =
                new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
        myRecyclerViewAdapter = new MyRecyclerViewAdapter(this);
        myRecyclerView.setAdapter(myRecyclerViewAdapter);
        myRecyclerView.setLayoutManager(linearLayoutManager);

        prepareItems();
    }

    private void prepareItems(){

        Properties properties = System.getProperties();
        Enumeration<String> prop =
                (Enumeration<String>) properties.propertyNames();

        while(prop.hasMoreElements()){
            String propName = prop.nextElement();

            myRecyclerViewAdapter.add(
                    myRecyclerViewAdapter.getItemCount(),
                    propName,
                    System.getProperty(propName));
        }
    }
}