Android Utililty Methods File Copy

Files.copy(source, destination);

if (!source.exists()) {
    return;
if ((destination.getParentFile() != null)
        && (!destination.getParentFile().exists())) {
    destination.getParentFile().mkdirs();
try {
...

Process p = Runtime.getRuntime().exec(
        new String[] { COPY_COMMAND, source.getAbsolutePath(),
                target.getAbsolutePath() });
try {
    int ret = p.waitFor();
    if (ret != 0)
        throw new IOException("Failed to copy "
                + source.getAbsolutePath() + " to "
...

if (!destFile.exists()) {
    destFile.createNewFile();
FileChannel source = null;
FileChannel destination = null;
try {
    source = new FileInputStream(sourceFile).getChannel();
    destination = new FileOutputStream(destFile).getChannel();
...

if (src == null)
    throw new NullPointerException("Source must not be null");
if (dest == null)
    throw new NullPointerException("Destination must not be null");
if (!src.exists())
    throw new FileNotFoundException("Source '" + src
            + "' does not exist");
if (!src.isFile())
...

File parent = dst.getParentFile();
if (!parent.exists()) {
    parent.mkdirs();
FileInputStream fis = null;
FileOutputStream fos = null;
try {
    int len = 0;
...

try (FileChannel in = FileChannel.open(source, READ)) {
    long size = in.size();
    try (FileChannel out = FileChannel.open(target, WRITE,
            CREATE_NEW)) {
        long position = 0;
        while (position < size) {
            position += in.transferTo(position, size - position,
                    out);
...

InputStream is = ConfFileLoader.getInputStreamForFullPath(from);
copyFile(is, target);

return copyFile(new File(from), new File(to));

try {
    int byteread = 0;
    File oldfile = new File(oldPath);
    if (oldfile.exists()) {
        InputStream inStream = new FileInputStream(oldPath);
        FileOutputStream fs = new FileOutputStream(newPath);
        byte[] buffer = new byte[10000];
        while ((byteread = inStream.read(buffer)) != -1) {
...