parseInt() is not work in data retrieve from csv file

Question

I tried to load the csv file from server and using the data to draw graph in my Android app.

Here is the code

private class DownloadFilesTask extends AsyncTask<URL, Void, List<String[]>> {
    protected List<String[]> doInBackground(URL... urls) {
        return downloadRemoteTextFileContent();
    }
    protected void onPostExecute(List<String[]> result) {
        if(result != null){
            createLineGraph(result);
        }
    }
}

private void createLineGraph(List<String[]> result){
    DataPoint[] dataPoints = new DataPoint[result.size()];
    for (int i = 0; i < result.size(); i++){
        String[] rows = result.get(i);
        Log.d(TAG, "Output " + Integer.parseInt(rows[0].trim()) + " " + Integer.parseInt(rows[1].trim()));
        dataPoints[i] = new DataPoint(Integer.parseInt(rows[0].trim()), Integer.parseInt(rows[1].trim()));
    }
    LineGraphSeries<DataPoint> series = new LineGraphSeries<DataPoint>(dataPoints);
    mGraph.addSeries(series);
}

private List<String[]> downloadRemoteTextFileContent(){
    URL mUrl = null;
    List<String[]> csvLine = new ArrayList<>();
    String[] content = null;
    try {
        mUrl = new URL(PATH_TO_SERVER);
    } catch (MalformedURLException e) {
        e.printStackTrace();
    }
    try {
        assert mUrl != null;
        URLConnection connection = mUrl.openConnection();
        BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String line = "";
        while((line = br.readLine()) != null){
            content = line.trim().split(",");
            csvLine.add(content);
        }
        br.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return csvLine;
}

However, the parseInt function in createLineGraph function return me this error

java.lang.NumberFormatException: For input string: "1"

I have no idea why the string read from csv file cannot parse into Integer. Please help!