Android Utililty Methods InputStream to Byte Array Convert

try {
    ByteArrayOutputStream bytestream = new ByteArrayOutputStream();
    int ch;
    while ((ch = is.read()) != -1) {
        bytestream.write(ch);
    byte imgdata[] = bytestream.toByteArray();
    bytestream.close();
...

ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();
int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
int len = 0;
while ((len = inputStream.read(buffer)) != -1) {
    byteBuffer.write(buffer, 0, len);
return byteBuffer.toByteArray();
...

if (null == is)
    return null;
byte[] cache = new byte[1 * 1024];
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
for (int length; (length = is.read(cache)) != -1;) {
    buffer.write(cache, 0, length);
is.close();
...

byte[] arrayOfByte = new byte[4096];
ByteArrayOutputStream localByteArrayOutputStream = new ByteArrayOutputStream();
while (true) {
    int i = paramInputStream.read(arrayOfByte);
    if (i == -1)
        break;
    localByteArrayOutputStream.write(arrayOfByte, 0, i);
return localByteArrayOutputStream.toByteArray();

if (is == null) {
    return null;
if (buffSize <= 0) {
    throw new IllegalArgumentException(
            "buffSize can not less than zero.....");
byte[] data = null;
...