yValuesD.add(new Entry(1, 95f));
    yValuesD.add(new Entry(2, 97f));
    yValuesD.add(new Entry(3, 94f));

    final LineDataSet set2 = new LineDataSet(yValuesD, "Diastolic Blood Pressure");

    ArrayList<ILineDataSet> dataSetsD = new ArrayList<>();
    dataSetsD.add(set2);

    final LineData data2 = new LineData(dataSetsD);

    //set data into dChart
    dChart.setData(data2);

    submitEntry = (Button) findViewById(R.id.submitEntry);
    newDia = (EditText) findViewById(R.id.newDia);
    numDate = (EditText) findViewById(R.id.numDate);
    submitEntry.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            dia = Integer.valueOf(newDia.getText().toString());
            dateNum2 = Integer.valueOf(numDate.getText().toString());

            Entry newPoint = new Entry(dateNum2,dia);
            set2.addEntry(newPoint);
            data2.notifyDataChanged();
            dChart.notifyDataSetChanged();
            dChart.invalidate();
        }
    });