ByteArrayOutputStream Out of Memory error when send over socket

I am writting a app transfer file based Socket.When I transfer file less than 10 mb ,then no matter what happens.But when I transfer file over 20mb, then I get Out of Memory error and crash my app.

This is my code

RandomAccessFile aFile = new RandomAccessFile(path, "r");
FileChannel inChannel = aFile.getChannel();
ByteBuffer buffer = ByteBuffer.allocate(1024);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int n;
while ((n = inChannel.read(buffer)) > 0) {
        buffer.flip();
        total_length += n;
        baos.write(buffer.array(), 0, n);
        byte[] aaa = baos.toByteArray();
        ObjectStream obstream = new ObjectStream("stream", aaa, session_request, total_length);
        aaa=null;
        outt.writeObject(obstream);
        obstream = null;
        baos.reset();
        buffer.clear(); // do something with the data and clear/compact it.
}
inChannel.close();
aFile.close();

This is error that geted :

FATAL EXCEPTION: Thread-177
java.lang.OutOfMemoryError
at java.io.ByteArrayOutputStream.toByteArray(ByteArrayOutputStream.java:122)
at com.jsc.Remote2Droid.Thread.ThreadClientData.run(ThreadClientData.java:705)

out of memory at location:

byte[] aaa = baos.toByteArray();

Please help me fix my code.Thank all.Sorry for my english.

ByteArrayOutputStream Out of Memory error when send over socket