Possible Duplicate:
File to byte[] in Java
I want to read data from file and unmarshal it to Parcel. In documentation it is not clear, that FileInputStream has method to read all its content. To implement this, I do folowing:
FileInputStream filein = context.openFileInput(FILENAME);
int read = 0;
int offset = 0;
int chunk_size = 1024;
int total_size = 0;
ArrayList<byte[]> chunks = new ArrayList<byte[]>();
chunks.add(new byte[chunk_size]);
//first I read data from file chunk by chunk
while ( (read = filein.read(chunks.get(chunks.size()-1), offset, buffer_size)) != -1) {
total_size+=read;
if (read == buffer_size) {
chunks.add(new byte[buffer_size]);
}
}
int index = 0;
// then I create big buffer
byte[] rawdata = new byte[total_size];
// then I copy data from every chunk in this buffer
for (byte [] chunk: chunks) {
for (byte bt : chunk) {
index += 0;
rawdata[index] = bt;
if (index >= total_size) break;
}
if (index>= total_size) break;
}
// and clear chunks array
chunks.clear();
// finally I can unmarshall this data to Parcel
Parcel parcel = Parcel.obtain();
parcel.unmarshall(rawdata,0,rawdata.length);
I think this code looks ugly, and my question is: How to do read data from file into byte[] beautifully? :)
Call any of these
byte[] org.apache.commons.io.FileUtils.readFileToByteArray(File file)
byte[] org.apache.commons.io.IOUtils.toByteArray(InputStream input)
From
If the library footprint is too big for your Android app, you can just use relevant classes from the commons-io library
Luckily, we now have a couple of convenience methods in the nio packages. For instance:
byte[] java.nio.file.Files.readAllBytes(Path path)