Android Pause And Resume Downloading File To Sdcard

I am making an application in which I need to download a file from server and save it to sd card of android device. Apart of this there is a feature for the user to pause and resum

Solution 1:

connection.setRequestProperty("Range", "bytes=" + ***downloaded*** + "-");

Make "downloaded" as global variable, because download start from this position.

when you press on restart button, check value of this downloaded variable,must not zero all time.

Solution 2:

This line return a wrong file size, I used the same code to open a Zip file on the net :

int lenghtOfFile = conexion.getContentLength();

How can I pause download other than by closing the output?

pauseButton.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            try {
                output.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    });
resumeButton.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View arg0) {
        //  not getting what to write here
    }
});