Android Utililty Methods File to Byte Array Read

if (StringUtil.isEmpty(filePath)) {
    return null;
File file = new File(filePath);
return readFileToByteArray(file);

byte[] data = new byte[0];
File file = new File(filePath);
if (file.exists()) {
    FileInputStream in = new FileInputStream(file);
    ByteArrayOutputStream out = new ByteArrayOutputStream(2048);
    byte[] cache = new byte[CACHE_SIZE];
    int nRead = 0;
    while ((nRead = in.read(cache)) != -1) {
...

byte[] data = new byte[0];
File file = new File(filePath);
if (file.exists()) {
    FileInputStream in = new FileInputStream(file);
    ByteArrayOutputStream out = new ByteArrayOutputStream(2048);
    byte[] cache = new byte[CACHE_SIZE];
    int nRead = 0;
    while ((nRead = in.read(cache)) != -1) {
...

InputStream is = new FileInputStream(file);
long length = file.length();
if (length > Integer.MAX_VALUE) {
byte[] bytes = new byte[(int) length];
int offset = 0;
int numRead = 0;
while (offset < bytes.length
...

FileInputStream in = new FileInputStream(file.getAbsolutePath());
try {
    return readBytes(in);
} catch (IOException e) {
    throw e;
} finally {
    in.close();

return readBytes(new File(path));

if (fileName == null) {
    return null;
File file = new File(fileName);
if (!file.exists()) {
    Log.i(TAG, "readFromFile: file not found");
    return null;
if (len == -1) {
    len = (int) file.length();
Log.d(TAG, "readFromFile : offset = " + offset + " len = " + len
        + " offset + len = " + (offset + len));
if (offset < 0) {
    Log.e(TAG, "readFromFile invalid offset:" + offset);
    return null;
if (len <= 0) {
    Log.e(TAG, "readFromFile invalid len:" + len);
    return null;
if (offset + len > (int) file.length()) {
    Log.e(TAG, "readFromFile invalid file len:" + file.length());
    return null;
byte[] b = null;
try {
    RandomAccessFile in = new RandomAccessFile(fileName, "r");
    b = new byte[len]; 
    in.seek(offset);
    in.readFully(b);
    in.close();
} catch (Exception e) {
    Log.e(TAG, "readFromFile : errMsg = " + e.getMessage());
    e.printStackTrace();
return b;

ByteArrayOutputStream ous = null;
InputStream ios = null;
try {
    byte[] buffer = new byte[4096];
    ous = new ByteArrayOutputStream();
    ios = new FileInputStream(file);
    int read = 0;
    while ((read = ios.read(buffer)) != -1) {
...

return buildDataFromFile(file.getAbsolutePath());

return buildDataFromFile(path, 1024);