Read File from SD Card in Android Application

package com.example.sd_file_read;
 
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
 
import android.animation.AnimatorSet.Builder;
import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
 
public class MainActivity extends Activity {
 
    TextView text;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button but = (Button) findViewById(R.id.button1);
        text = (TextView) findViewById(R.id.textView1);
        but.setOnClickListener(new View.OnClickListener() {
 
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                readFileFromSDCard();
            }
        });
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
 
    private void readFileFromSDCard() {
        File directory = Environment.getExternalStorageDirectory();
        // Assumes that a file article.rss is available on the SD card
        File file = new File(directory + "/article.rss");
        if (!file.exists()) {
            throw new RuntimeException("File not found");
        }
        Log.e("Testing", "Starting to read");
        BufferedReader reader = null;
        StringBuilder builder = null;
        try {
            reader = new BufferedReader(new FileReader(file));
            builder = new StringBuilder();
            String line;
            while ((line = reader.readLine()) != null) {
                builder.append(line);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        text.setText(builder.toString());
    }
}