package com.androidbegin.filterlistviewtutorial;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.widget.TextView;

public class SingleItemView extends Activity {

    // Declare Variables

    TextView txtrank;

    TextView txtcountry;

    TextView txtpopulation;

    String rank;

    String country;

    String population;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.singleitemview);

        // Retrieve data from MainActivity on item click event

        Intent i = getIntent();

        // Get the results of rank

        rank = i.getStringExtra("rank");

        // Get the results of country

        country = i.getStringExtra("country");

        // Get the results of population

        population = i.getStringExtra("population");

        // Locate the TextViews in singleitemview.xml

        txtrank = (TextView) findViewById(R.id.rank);

        txtcountry = (TextView) findViewById(R.id.country);

        txtpopulation = (TextView) findViewById(R.id.population);

        // Load the results into the TextViews

        txtrank.setText(rank);

        txtcountry.setText(country);

        txtpopulation.setText(population);

    }

}

인터넷에 있는 예제 실행중인데 다른 클래스에서도 R만 오류가 나네요.