Reading text file from sdcard

MainActivity.java

package com.hungrydroid.textread;

import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Environment;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    TextView dispText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        dispText = (TextView) findViewById(R.id.text);


        // Here, this is the current activity
        if (ContextCompat.checkSelfPermission(this,
                Manifest.permission.READ_CONTACTS)
                != PackageManager.PERMISSION_GRANTED) {

            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                    0);
        } else {
            try {
                // You can provide the dir location from SD card root
                String data = getTextFileData("data.txt");

                // Display the text contents on a TextView
                dispText.setText(data);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }


    }

    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) {
        switch (requestCode) {
            case 0: {
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                    // permission was granted, yay! Do the
                    // contacts-related task you need to do.
                    try {
                        // You can provide the dir location from SD card root
                        String data = getTextFileData("data.txt");

                        // Display the text conetents on a TextView
                        dispText.setText(data);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                } else {

                    // permission denied, boo! Disable the
                    // functionality that depends on this permission.
                }
                return;
            }

            // other 'case' lines to check for other
            // permissions this app might request
        }
    }

    public String getTextFileData(String fileName) {

        // Get the dir of SD Card
        File sdCardDir = Environment.getExternalStorageDirectory();

        // Get The Text file
        File txtFile = new File(sdCardDir, fileName);

        // Read the file Contents in a StringBuilder Object
        StringBuilder text = new StringBuilder();

        try {

            BufferedReader reader = new BufferedReader(new FileReader(txtFile));

            String line;

            while ((line = reader.readLine()) != null) {
                text.append(line + '\n');
            }
            reader.close();
        } catch (IOException e) {
            Log.e("C2c", "Error occured while reading text file!!");

        }

        return text.toString();

    }
}