Android4.4でBufferedReaderがファイルの最後の行に、無駄な改行を入れているとそのまま読み込んで、readLineでnullが返ってくるコード。

MainActivity.java

package com.example.bufferedreader_test;

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

import android.app.Activity;
import android.content.Context;
import android.content.res.AssetManager;
import android.os.Bundle;
import android.util.Log;

/* BufferedReaderTest.txtの中身(----------内。最後に無駄な改行を入れる)
-------------------------------------
1test
2test
3test
4test
5test
6test
7test
8test

-------------------------------------
*/

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		try {
			AssetManager as = getResources().getAssets();
			InputStream input = null;
			FileOutputStream output = null;

			// assets内のファイルをfilesにコピーする
			input = as.open("BufferedReaderTest.txt");
			output = openFileOutput("BufferedReaderTest.txt", Context.MODE_PRIVATE);

			int DEFAULT_BUFFER_SIZE = 1024 * 4;

			byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
			int n = 0;
			while (-1 != (n = input.read(buffer))) {
				output.write(buffer, 0, n);
			}
			output.close();
			input.close();
		} catch (IOException e) {
			e.printStackTrace();
		}

		File packageDir = getFilesDir();
		String connectionFilePath = packageDir.toString() + "/BufferedReaderTest.txt";

		try {
			File paramString = new File(connectionFilePath);
			BufferedReader bufferedReader = new BufferedReader(new FileReader(paramString));
			while (bufferedReader.ready()) {
				String str = bufferedReader.readLine();
				Log.d("MainActivity",str);
			}

			bufferedReader.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}