Android File To Base64 using streaming sometimes missed 2 bytes

Question

i am writing to ask for the proper solution for solving the following difficulties:

I am required to encode the file in Base64 format, and there is no way for me to

Answer 1

Your streams should be flushed before using them for other operations and before closing them:

FileOutputStream fout = new FileOutputStream(path + ".txt");
//this is for printing out the base64 content
FileInputStream fin = new FileInputStream(path);
System.out.println("File Size:" + path.length());   // path.getTotalSpace() is the filesystem size
ByteArrayOutputStream os = new ByteArrayOutputStream();
Base64OutputStream base64out = new Base64OutputStream(os,Base64.NO_WRAP);

byte[] buffer = new byte[3 * 512];
int len = 0;
while ((len = fin.read(buffer)) >= 0) {
    base64out.write(buffer, 0, len);
}
System.out.println("Encoded Size:" + os.size());

base64out.write(System.lineSeparator().getBytes());   
base64out.flush();  // to be sure that everything is in the byte array
String result = new String(os.toByteArray(), "UTF-8");
fout.write(os.toByteArray());
fout.flush();  // make sure everything is written
fout.close();
base64out.close();
os.close();
fin.close();

System.out.println("new File Size:" + new File(path + ".txt").length()); // prints out the size of the finished file

return result;