Android中如何将大文本文件分解成几个小文件（记录）

/**
 * 分解文件
 * 
 * @param filePath
 * @param fileCount
 * @throws IOException
 */
public static void splitFile(String filePath, int fileCount) throws IOException {
    FileInputStream fis = new FileInputStream(filePath);
    FileChannel inputChannel = fis.getChannel();
    final long fileSize = inputChannel.size();
    long average = fileSize / fileCount;//平均值
    long bufferSize = 200; //缓存块大小，自行调整
    ByteBuffer byteBuffer = ByteBuffer.allocate(Integer.valueOf(bufferSize + "")); // 申请一个缓存区
    long startPosition = 0; //子文件开始位置
    long endPosition = average < bufferSize ? 0 : average - bufferSize;//子文件结束位置
    for (int i = 0; i < fileCount; i++) {
        if (i + 1 != fileCount) {
            int read = inputChannel.read(byteBuffer, endPosition);// 读取数据
            readW:
            while (read != -1) {
                byteBuffer.flip();//切换读模式
                byte[] array = byteBuffer.array();
                for (int j = 0; j < array.length; j++) {
                    byte b = array[j];
                    if (b == 10 || b == 13) { //判断\n\r
                        endPosition += j;
                        break readW;
                    }
                }
                endPosition += bufferSize;
                byteBuffer.clear(); //重置缓存块指针
                read = inputChannel.read(byteBuffer, endPosition);
            }
        }else{
            endPosition = fileSize; //最后一个文件直接指向文件末尾
        }

        String aa = filePath.substring(0, filePath.length() - 4) + (i + 1) + ".txt";
        FileOutputStream fos = new FileOutputStream(aa);
        FileChannel outputChannel = fos.getChannel();
        inputChannel.transferTo(startPosition, endPosition - startPosition, outputChannel);//通道传输文件数据
        outputChannel.close();
        fos.close();
        startPosition = endPosition + 1;
        endPosition += average;
    }
    inputChannel.close();
    fis.close();
}